{"id":106172,"date":"2026-09-16T19:40:32","date_gmt":"2026-09-16T11:40:32","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/106172.html"},"modified":"2026-09-16T19:40:32","modified_gmt":"2026-09-16T11:40:32","slug":"observable-plot-%e6%ba%90%e7%a0%81%e6%b7%b1%e5%ba%a6%e8%a7%a3%e6%9e%90-5-plot-%e4%b8%bb%e6%b5%81%e7%a8%8b%e5%85%a8%e6%99%af","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/106172.html","title":{"rendered":"Observable Plot \u6e90\u7801\u6df1\u5ea6\u89e3\u6790\u2014\u20145 plot() \u4e3b\u6d41\u7a0b\u5168\u666f"},"content":{"rendered":"

\u7b2c 5 \u7ae0 plot() \u4e3b\u6d41\u7a0b\u5168\u666f<\/h2>\n

\u7b2c 3 \u7ae0\u7ed9\u51fa\u4e86\u6a21\u5757\u5730\u56fe，\u7b2c 4 \u7ae0\u62c6\u5f00\u4e86\u516d\u4e2a\u6838\u5fc3\u62bd\u8c61\u3002\u4f46\u5730\u56fe\u4e0e\u96f6\u4ef6\u90fd\u8fd8\u4e0d\u7b49\u4e8e"\u673a\u5668\u600e\u4e48\u8f6c"\u3002\u672c\u7ae0\u56de\u5230\u552f\u4e00\u7684\u7f16\u6392\u5668 src\/plot.js，\u628a plot(options) \u8fd9 340 \u884c\u4ee3\u7801\u62c6\u6210 21 \u4e2a\u53ef\u9a8c\u8bc1\u7684\u6b65\u9aa4\u30015 \u4e2a\u8bed\u4e49\u9636\u6bb5\u3002<\/p>\n

\u8fd9\u4e00\u7ae0\u662f\u6574\u672c\u6559\u7a0b\u7684"\u603b\u67a2\u7ebd"：\u7b2c 6 \u7ae0\u7684 scale \u63a8\u65ad\u3001\u7b2c 7 \u7ae0\u7684 transform\u3001\u7b2c 8 \u7ae0\u7684 render\u3001\u7b2c 9 \u7ae0\u7684 facet\/axis\/legend，\u5168\u90fd\u53d1\u751f\u5728\u4e0b\u9762\u7684 21 \u6b65\u91cc\u3002\u628a\u672c\u7ae0\u7684\u6b65\u9aa4\u7f16\u53f7\u8bb0\u4f4f，\u540e\u9762\u6bcf\u4e00\u7ae0\u4f60\u90fd\u80fd\u51c6\u786e\u5b9a\u4f4d\u5230"\u5b83\u63d2\u5728\u54ea\u4e00\u6b65"\u3002<\/p>\n

\u8bfb\u5b8c\u672c\u7ae0\u5e94\u8be5\u80fd\u56de\u7b54：<\/p>\n

  • \u4ece Plot.plot({…}) \u5230\u8fd4\u56de\u4e00\u4e2a <svg>，\u4e00\u5171\u7ecf\u8fc7\u54ea\u4e9b\u9636\u6bb5？\u6bcf\u4e2a\u9636\u6bb5\u7684\u8f93\u5165\u8f93\u51fa\u662f\u4ec0\u4e48？<\/li>\n
  • \u4e3a\u4ec0\u4e48 createScales \u8981\u88ab\u8c03\u7528\u4e24\u6b21（\u7b2c 9 \u6b65\u4e0e\u7b2c 15 \u6b65）？<\/li>\n
  • facetStateByMark \/ channelsByScale \/ stateByMark \u8fd9\u4e09\u5f20 Map \u5206\u522b\u5728\u4ec0\u4e48\u65f6\u673a\u88ab\u5199\u5165\u3001\u88ab\u8c01\u8bfb\u53d6？<\/li>\n
    5.1 \u4e3a\u4ec0\u4e48\u8fd9\u6bb5\u4ee3\u7801\u503c\u5f97\u9010\u884c\u8bfb<\/h6>\n

    \u5728 Plot \u7684 81 \u4e2a .js \u6587\u4ef6\u91cc，plot.js \u662f**\u6700\u4e0d\u50cf"\u5e93\u4ee3\u7801"**\u7684\u4e00\u4e2a：745 \u884c\u91cc\u7edd\u5927\u591a\u6570\u662f\u987a\u5e8f\u6267\u884c\u7684\u8bed\u53e5，\u800c\u4e0d\u662f\u53ef\u590d\u7528\u7684\u51fd\u6570\u6216\u7c7b\u3002\u5f88\u591a\u4eba\u7b2c\u4e00\u6b21\u770b\u4f1a\u7591\u60d1\u2014\u2014\u4e3a\u4ec0\u4e48\u4e0d\u628a\u8fd9\u6bb5\u903b\u8f91\u62c6\u6210\u5341\u51e0\u4e2a\u5c0f\u6a21\u5757？<\/p>\n

    \u7b54\u6848\u662f：plot() \u7684\u6838\u5fc3\u4ef7\u503c\u5c31\u662f"\u987a\u5e8f"\u672c\u8eab\u3002<\/p>\n

    \u56fe\u5f62\u5e93\u6700\u5bb9\u6613\u51fa\u95ee\u9898\u7684\u5730\u65b9\u4e0d\u662f\u67d0\u4e2a\u7b97\u6cd5\u5199\u9519，\u800c\u662f\u6b65\u9aa4\u987a\u5e8f\u98a0\u5012\u3002\u4e3e\u51e0\u4e2a\u771f\u5b9e\u5b58\u5728\u7684\u987a\u5e8f\u7ea6\u675f：<\/p>\n

      \n
    • \u5fc5\u987b\u5148\u6536\u96c6\u5b8c\u6240\u6709 channel \u624d\u80fd\u521b\u5efa\u6bd4\u4f8b\u5c3a（\u5426\u5219 domain \u4e0d\u5b8c\u6574）；<\/li>\n
    • \u5fc5\u987b\u5148\u7b97\u51fa\u6bd4\u4f8b\u5c3a\u7684 domain \u624d\u80fd\u521b\u5efa facets（\u56e0\u4e3a facet \u7684\u683c\u5b50\u6570\u7531 fx\/fy \u7684 domain \u51b3\u5b9a）；<\/li>\n
    • \u53c8\u5fc5\u987b\u5728 facets \u5efa\u597d\u4e4b\u540e\u91cd\u6392\u5b83\u4eec，\u56e0\u4e3a fx\/fy \u7684 domain \u6b64\u65f6\u624d\u6700\u7ec8\u786e\u5b9a（\u7b2c 16 \u6b65）；<\/li>\n
    • \u5fc5\u987b\u5148 createContext \u624d\u80fd\u8ba9\u67d0\u4e9b mark \u7684 initializer \u751f\u6210\u4e8c\u7ea7 channel（\u5982\u5750\u6807\u8f74\u7684\u523b\u5ea6）；<\/li>\n
    • \u800c initializer \u751f\u6210\u7684\u65b0 channel \u53ef\u80fd\u9700\u8981\u65b0\u7684\u6bd4\u4f8b\u5c3a，\u4e8e\u662f\u8981\u56de\u5934\u91cd\u5efa scales（\u7b2c 15 \u6b65）\u3002<\/li>\n<\/ul>\n

      \u8fd9\u4e9b\u7ea6\u675f\u7528"\u62c6\u6210\u6a21\u5757 + \u4e8b\u4ef6\u56de\u8c03"\u8868\u8fbe\u4f1a\u7acb\u523b\u53d8\u5f97\u96be\u4ee5\u8ffd\u8e2a\u3002\u628a\u6d41\u7a0b\u5199\u5728\u4e00\u4e2a\u51fd\u6570\u91cc，\u7528\u6ce8\u91ca\u6807\u6ce8\u987a\u5e8f\u4f9d\u8d56，\u53cd\u800c\u662f\u8fd9\u4e2a\u573a\u666f\u4e0b\u6700\u6e05\u6670\u7684\u9009\u62e9\u3002\u8bfb\u5b83\u7684\u6b63\u786e\u59ff\u52bf\u662f：\u4e0d\u8981\u8bd5\u56fe\u8bb0\u4f4f\u6bcf\u4e00\u884c\u7684\u7ec6\u8282，\u800c\u662f\u8bb0\u4f4f"\u9636\u6bb5\u8fb9\u754c"\u548c"\u4e3a\u4ec0\u4e48\u8fd9\u4e24\u4e2a\u9636\u6bb5\u7684\u5148\u540e\u4e0d\u80fd\u6362"\u3002<\/p>\n

      5.2 21 \u6b65\u5168\u666f\u56fe（\u57fa\u4e8e src\/plot.js L22-L361 \u771f\u5b9e\u4ee3\u7801）<\/h6>\n

      \u5148\u770b\u5168\u8c8c\u3002\u4e0b\u56fe\u6bcf\u4e00\u6b65\u90fd\u6807\u6ce8\u4e86\u5bf9\u5e94\u7684\u6e90\u7801\u884c\u53f7，\u4fbf\u4e8e\u5bf9\u7167\u9605\u8bfb：<\/p>\n

      #mermaid-svg-EYXJ0nWQAtSiSePE{font-family:\\”trebuchet ms\\”,verdana,arial,sans-serif;font-size:16px;fill:#333;}@keyframes edge-animation-frame{from{stroke-dashoffset:0;}}@keyframes dash{to{stroke-dashoffset:0;}}#mermaid-svg-EYXJ0nWQAtSiSePE .edge-animation-slow{stroke-dasharray:9,5!important;stroke-dashoffset:900;animation:dash 50s linear infinite;stroke-linecap:round;}#mermaid-svg-EYXJ0nWQAtSiSePE .edge-animation-fast{stroke-dasharray:9,5!important;stroke-dashoffset:900;animation:dash 20s linear infinite;stroke-linecap:round;}#mermaid-svg-EYXJ0nWQAtSiSePE .error-icon{fill:#552222;}#mermaid-svg-EYXJ0nWQAtSiSePE .error-text{fill:#552222;stroke:#552222;}#mermaid-svg-EYXJ0nWQAtSiSePE .edge-thickness-normal{stroke-width:1px;}#mermaid-svg-EYXJ0nWQAtSiSePE .edge-thickness-thick{stroke-width:3.5px;}#mermaid-svg-EYXJ0nWQAtSiSePE .edge-pattern-solid{stroke-dasharray:0;}#mermaid-svg-EYXJ0nWQAtSiSePE .edge-thickness-invisible{stroke-width:0;fill:none;}#mermaid-svg-EYXJ0nWQAtSiSePE .edge-pattern-dashed{stroke-dasharray:3;}#mermaid-svg-EYXJ0nWQAtSiSePE .edge-pattern-dotted{stroke-dasharray:2;}#mermaid-svg-EYXJ0nWQAtSiSePE .marker{fill:#333333;stroke:#333333;}#mermaid-svg-EYXJ0nWQAtSiSePE .marker.cross{stroke:#333333;}#mermaid-svg-EYXJ0nWQAtSiSePE svg{font-family:\\”trebuchet ms\\”,verdana,arial,sans-serif;font-size:16px;}#mermaid-svg-EYXJ0nWQAtSiSePE p{margin:0;}#mermaid-svg-EYXJ0nWQAtSiSePE .label{font-family:\\”trebuchet ms\\”,verdana,arial,sans-serif;color:#333;}#mermaid-svg-EYXJ0nWQAtSiSePE .cluster-label text{fill:#333;}#mermaid-svg-EYXJ0nWQAtSiSePE .cluster-label span{color:#333;}#mermaid-svg-EYXJ0nWQAtSiSePE .cluster-label span p{background-color:transparent;}#mermaid-svg-EYXJ0nWQAtSiSePE .label text,#mermaid-svg-EYXJ0nWQAtSiSePE span{fill:#333;color:#333;}#mermaid-svg-EYXJ0nWQAtSiSePE .node rect,#mermaid-svg-EYXJ0nWQAtSiSePE .node circle,#mermaid-svg-EYXJ0nWQAtSiSePE .node ellipse,#mermaid-svg-EYXJ0nWQAtSiSePE .node polygon,#mermaid-svg-EYXJ0nWQAtSiSePE .node path{fill:#ECECFF;stroke:#9370DB;stroke-width:1px;}#mermaid-svg-EYXJ0nWQAtSiSePE .rough-node .label text,#mermaid-svg-EYXJ0nWQAtSiSePE .node .label text,#mermaid-svg-EYXJ0nWQAtSiSePE .image-shape .label,#mermaid-svg-EYXJ0nWQAtSiSePE .icon-shape .label{text-anchor:middle;}#mermaid-svg-EYXJ0nWQAtSiSePE .node .katex path{fill:#000;stroke:#000;stroke-width:1px;}#mermaid-svg-EYXJ0nWQAtSiSePE .rough-node .label,#mermaid-svg-EYXJ0nWQAtSiSePE .node .label,#mermaid-svg-EYXJ0nWQAtSiSePE .image-shape .label,#mermaid-svg-EYXJ0nWQAtSiSePE .icon-shape .label{text-align:center;}#mermaid-svg-EYXJ0nWQAtSiSePE .node.clickable{cursor:pointer;}#mermaid-svg-EYXJ0nWQAtSiSePE .root .anchor path{fill:#333333!important;stroke-width:0;stroke:#333333;}#mermaid-svg-EYXJ0nWQAtSiSePE .arrowheadPath{fill:#333333;}#mermaid-svg-EYXJ0nWQAtSiSePE .edgePath .path{stroke:#333333;stroke-width:2.0px;}#mermaid-svg-EYXJ0nWQAtSiSePE .flowchart-link{stroke:#333333;fill:none;}#mermaid-svg-EYXJ0nWQAtSiSePE .edgeLabel{background-color:rgba(232,232,232, 0.8);text-align:center;}#mermaid-svg-EYXJ0nWQAtSiSePE .edgeLabel p{background-color:rgba(232,232,232, 0.8);}#mermaid-svg-EYXJ0nWQAtSiSePE .edgeLabel rect{opacity:0.5;background-color:rgba(232,232,232, 0.8);fill:rgba(232,232,232, 0.8);}#mermaid-svg-EYXJ0nWQAtSiSePE .labelBkg{background-color:rgba(232, 232, 232, 0.5);}#mermaid-svg-EYXJ0nWQAtSiSePE .cluster rect{fill:#ffffde;stroke:#aaaa33;stroke-width:1px;}#mermaid-svg-EYXJ0nWQAtSiSePE .cluster text{fill:#333;}#mermaid-svg-EYXJ0nWQAtSiSePE .cluster span{color:#333;}#mermaid-svg-EYXJ0nWQAtSiSePE div.mermaidTooltip{position:absolute;text-align:center;max-width:200px;padding:2px;font-family:\\”trebuchet ms\\”,verdana,arial,sans-serif;font-size:12px;background:hsl(80, 100%, 96.2745098039%);border:1px solid #aaaa33;border-radius:2px;pointer-events:none;z-index:100;}#mermaid-svg-EYXJ0nWQAtSiSePE .flowchartTitleText{text-anchor:middle;font-size:18px;fill:#333;}#mermaid-svg-EYXJ0nWQAtSiSePE rect.text{fill:none;stroke-width:0;}#mermaid-svg-EYXJ0nWQAtSiSePE .icon-shape,#mermaid-svg-EYXJ0nWQAtSiSePE .image-shape{background-color:rgba(232,232,232, 0.8);text-align:center;}#mermaid-svg-EYXJ0nWQAtSiSePE .icon-shape p,#mermaid-svg-EYXJ0nWQAtSiSePE .image-shape p{background-color:rgba(232,232,232, 0.8);padding:2px;}#mermaid-svg-EYXJ0nWQAtSiSePE .icon-shape .label rect,#mermaid-svg-EYXJ0nWQAtSiSePE .image-shape .label rect{opacity:0.5;background-color:rgba(232,232,232, 0.8);fill:rgba(232,232,232, 0.8);}#mermaid-svg-EYXJ0nWQAtSiSePE .label-icon{display:inline-block;height:1em;overflow:visible;vertical-align:-0.125em;}#mermaid-svg-EYXJ0nWQAtSiSePE .node .label-icon path{fill:currentColor;stroke:revert;stroke-width:revert;}#mermaid-svg-EYXJ0nWQAtSiSePE :root{–mermaid-font-family:\\”trebuchet ms\\”,verdana,arial,sans-serif;}<\/span><\/span><\/span><\/span><\/p>\n

      \u9636\u6bb5 E \u00b7 \u5305\u88c5\u4e0e\u8f93\u51fa（\u6b65\u9aa4 20\u201321）<\/p>\n

      <\/span><\/span><\/span><\/p>\n

      20. createLegends + wrap figure(L330-L341)<\/p>\n

      <\/span><\/p>\n

      21. exposeScales\/legends + warnings(L343-L358)<\/p>\n

      <\/span><\/p>\n

      return figure(L360)<\/p>\n

      <\/span><\/p>\n

      \u9636\u6bb5 D \u00b7 \u7f29\u653e\u4e0e\u6e32\u67d3（\u6b65\u9aa4 17\u201319）<\/p>\n

      <\/span><\/span><\/span><\/p>\n

      17. mark.scale(L245-L247)\u5e94\u7528 scale \u5230 channel<\/p>\n

      <\/span><\/p>\n

      18. select(svg).attr()(L251-L278)\u5efa svg \u6839\u5143\u7d20+inline style<\/p>\n

      <\/span><\/p>\n

      19. \u6e32\u67d3 marks(L281-L327)mark.render()<\/p>\n

      <\/span><\/p>\n

      \u9636\u6bb5 C \u00b7 \u73af\u5883\u4e0e\u4e8c\u9636\u901a\u9053（\u6b65\u9aa4 13\u201316）<\/p>\n

      <\/span><\/span><\/span><\/span><\/p>\n

      13. createContext(L154)DOM\/projection\/path<\/p>\n

      <\/span><\/p>\n

      14. initializers(L186-L220)\u4e8c\u9636 channel<\/p>\n

      <\/span><\/p>\n

      15. \u91cd\u5efa scales（\u6309\u9700）(L224-L233)<\/p>\n

      <\/span><\/p>\n

      16. recreateFacets(L240)\u6309 fx\/fy \u5b9e\u9645 domain \u91cd\u6392<\/p>\n

      <\/span><\/p>\n

      \u9636\u6bb5 B \u00b7 \u521d\u59cb\u5316\u4e0e\u6bd4\u4f8b\u5c3a（\u6b65\u9aa4 8\u201312）<\/p>\n

      <\/span><\/span><\/span><\/span><\/span><\/p>\n

      8. \u6807\u8bb0\u521d\u59cb\u5316(L134)mark.initialize()<\/p>\n

      <\/span><\/p>\n

      9. createScales(L143)\u751f\u6210 scaleDescriptors<\/p>\n

      <\/span><\/p>\n

      10. createDimensions(L144)\u7b97 width\/height\/margin<\/p>\n

      <\/span><\/p>\n

      11. autoScaleRange(L146)position scale \u81ea\u52a8 range<\/p>\n

      <\/span><\/p>\n

      12. createScaleFunctions(L148)scale \u51fd\u6570\u5316<\/p>\n

      <\/span><\/p>\n

      \u9636\u6bb5 A \u00b7 \u58f0\u660e\u671f\u6574\u7406（\u6b65\u9aa4 1\u20137）<\/p>\n

      <\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/p>\n

      1. flatMarks(L29)\u5904\u7406\u5d4c\u5957 mark \u6570\u7ec4<\/p>\n

      <\/span><\/p>\n

      2. inferTips(L32)\u9690\u5f0f tip<\/p>\n

      <\/span><\/p>\n

      3. maybeTopFacet(L38)\u9876\u5c42 facet<\/p>\n

      <\/span><\/p>\n

      4. \u904d\u5386 marks: maybeMarkFacet(L45)\u6bcf\u4e2a mark \u7684 facet<\/p>\n

      <\/span><\/p>\n

      5. addScaleChannels(L51-L53)\u6536\u96c6 channelsByScale<\/p>\n

      <\/span><\/p>\n

      6. inferAxes(L58)\u63a8\u65ad axisX\/axisY\/gridX\/gridY<\/p>\n

      <\/span><\/p>\n

      7. createFacets(L68)\u8ba1\u7b97 facet \u5217\u8868<\/p>\n

      <\/span><\/p>\n

      21 \u6b65\u53ef\u4ee5\u5f52\u6210 5 \u4e2a\u8bed\u4e49\u9636\u6bb5，\u6bcf\u4e2a\u9636\u6bb5\u6709\u4e00\u4e2a\u660e\u786e\u7684"\u4ea7\u7269"：<\/p>\n\n\u9636\u6bb5\u6b65\u9aa4\u4ea7\u7269\u4e00\u53e5\u8bdd\u804c\u8d23<\/tr>\n\n\n\n\n\n\n
      A. \u58f0\u660e\u671f\u6574\u7406<\/td>\n1\u20137<\/td>\nmarks \/ facetStateByMark \/ channelsByScale<\/td>\n\u628a\u7528\u6237\u5199\u7684 declarations \u6574\u7406\u6210"\u53ef\u6267\u884c\u7684\u7ed3\u6784"<\/td>\n<\/tr>\n
      B. \u521d\u59cb\u5316\u4e0e\u6bd4\u4f8b\u5c3a<\/td>\n8\u201312<\/td>\nstateByMark \/ scaleDescriptors \/ scales \/ dimensions<\/td>\n\u6570\u636e\u7269\u5316 + \u5ea6\u91cf\u7cfb\u7edf\u5efa\u7acb<\/td>\n<\/tr>\n
      C. \u73af\u5883\u4e0e\u4e8c\u9636\u901a\u9053<\/td>\n13\u201316<\/td>\ncontext \/ \u65b0\u589e channels \/ \u6700\u7ec8 facets<\/td>\n\u51c6\u5907\u8fd0\u884c\u65f6\u73af\u5883\u5e76\u6309\u9700\u91cd\u7b97<\/td>\n<\/tr>\n
      D. \u7f29\u653e\u4e0e\u6e32\u67d3<\/td>\n17\u201319<\/td>\n\u5404 mark \u7684 SVG \u8282\u70b9<\/td>\n\u6570\u503c \u2192 \u50cf\u7d20 \u2192 DOM<\/td>\n<\/tr>\n
      E. \u5305\u88c5\u4e0e\u8f93\u51fa<\/td>\n20\u201321<\/td>\nfigure（\u542b\u56fe\u4f8b\u3001.scale\u3001.legend）<\/td>\n\u7ec4\u88c5\u6700\u7ec8\u8fd4\u56de\u503c<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

      \u4e0b\u9762\u9010\u9636\u6bb5\u5c55\u5f00\u3002<\/p>\n

      5.3 \u9636\u6bb5 A：\u58f0\u660e\u671f\u6574\u7406（\u6b65\u9aa4 1\u20137）<\/h6>\n

      \u6b65\u9aa4 1\u20132：\u6241\u5e73\u5316 marks \u4e0e\u9690\u5f0f tip\u3002 Plot \u5141\u8bb8 marks \u91cc\u5199\u6570\u7ec4\u3001\u5199 null（\u7528\u4e8e\u6761\u4ef6\u6e32\u67d3），\u4e5f\u5141\u8bb8 mark \u81ea\u5df1\u58f0\u660e tip: true：<\/p>\n

      \/\/ src\/plot.js L28-L32<\/span>
      \n\/\/ Flatten any nested marks.<\/span>
      \nconst<\/span> marks =<\/span> options.<\/span>marks ===<\/span> undefined<\/span> ?<\/span> [<\/span>]<\/span> :<\/span> flatMarks<\/span>(<\/span>options.<\/span>marks)<\/span>;<\/span><\/p>\n

      \/\/ Add implicit tips.<\/span>
      \nmarks.<\/span>push<\/span>(<\/span>…<\/span>inferTips<\/span>(<\/span>marks)<\/span>)<\/span>;<\/span><\/p>\n

      flatMarks \u7528 flat(Infinity) \u628a\u5d4c\u5957\u6570\u7ec4\u538b\u5e73，\u5e76\u987a\u624b\u505a\u4e86\u4e00\u6b21\u7c7b\u578b\u5f52\u4e00\u5316：\u4efb\u4f55\u5e26 render \u65b9\u6cd5\u7684\u666e\u901a\u5bf9\u8c61\u4f1a\u88ab markify \u5305\u6210 Render \u5b9e\u4f8b（Render extends Mark）\u3002\u8fd9\u5c31\u662f \u201crender \u51fd\u6570\u53ef\u4ee5\u76f4\u63a5\u5f53 mark \u7528\u201d \u7684\u5b9e\u73b0\u65b9\u5f0f\u3002<\/p>\n

      inferTips \u5219\u5c55\u793a\u4e86 Plot \u7684\u4e00\u4e2a\u53d6\u5411：\u5c3d\u91cf\u628a\u7528\u6237\u6ca1\u5199\u7684\u3001\u4f46\u663e\u7136\u9700\u8981\u7684\u4e1c\u897f\u8865\u4e0a\u3002\u5982\u679c\u67d0\u4e2a mark \u58f0\u660e\u4e86 tip，\u5b83\u4f1a\u81ea\u52a8\u6d3e\u751f\u51fa\u82e5\u5e72 tip mark，\u4e14\u7ee7\u627f\u539f mark \u7684 facet \u8bbe\u7f6e\u2014\u2014\u7b2c 2 \u6b65\u5c31\u5b8c\u6210\u7684\u9690\u5f0f\u8865\u5168，\u662f\u540e\u9762 marks \u6570\u7ec4\u91cc"\u591a\u51fa\u6765\u7684\u90a3\u4e9b mark"\u7684\u6765\u6e90\u3002<\/p>\n

      \u6b65\u9aa4 3\u20134：\u4e24\u5c42 facet \u72b6\u6001\u3002 facet \u6709\u4e24\u79cd\u5199\u6cd5：\u9876\u5c42 facet: {x: "year"}（\u4f5c\u7528\u4e8e\u6240\u6709 mark），\u4ee5\u53ca mark \u7ea7 Plot.dot(data, {fx: "year"})\u3002plot.js \u628a\u4e24\u8005\u7edf\u4e00\u6210\u540c\u4e00\u5957\u7ed3\u6784：<\/p>\n

      \/\/ src\/plot.js L38-L48<\/span>
      \n\/\/ Compute the top-level facet state. This has roughly the same structure as<\/span>
      \n\/\/ mark-specific facet state, except there isn\u2019t a facetsIndex, and there\u2019s a<\/span>
      \n\/\/ data and dataLength so we can warn the user if a different data of the same<\/span>
      \n\/\/ length is used in a mark.<\/span>
      \n\/\/ \u8bd1：\u8ba1\u7b97\u9876\u5c42\u5206\u9762\u72b6\u6001\u3002\u7ed3\u6784\u4e0e mark \u7ea7\u5206\u9762\u72b6\u6001\u5927\u4f53\u76f8\u540c，\u533a\u522b\u5728\u4e8e\u6ca1\u6709 facetsIndex，<\/span>
      \n\/\/ \u4f46\u591a\u4e86 data \u548c dataLength\u2014\u2014\u4ee5\u4fbf\u5728\u67d0\u4e2a mark \u7528\u4e86\u201c\u540c\u957f\u5ea6\u7684\u53e6\u4e00\u4efd\u6570\u636e\u201d\u65f6\u5411\u7528\u6237\u544a\u8b66\u3002<\/span>
      \nconst<\/span> topFacetState =<\/span> maybeTopFacet<\/span>(<\/span>facet,<\/span> options)<\/span>;<\/span>
      \n\/\/ Construct a map from (faceted) Mark instance to facet state, including:<\/span>
      \n\/\/ channels – an {fx?, fy?} object to add to the fx and fy scale<\/span>
      \n\/\/ groups – a possibly-nested map from facet values to indexes in the data array<\/span>
      \n\/\/ facetsIndex – a sparse nested array of indices corresponding to the valid facets<\/span>
      \n\/\/ \u8bd1：\u6784\u9020\u4e00\u4e2a\u4ece（\u5206\u9762\u7684）Mark \u5b9e\u4f8b\u5230\u5206\u9762\u72b6\u6001\u7684\u6620\u5c04，\u5305\u62ec：<\/span>
      \n\/\/ channels – \u4e00\u4e2a\u4f1a\u88ab\u5e76\u5165 fx\/fy \u6bd4\u4f8b\u5c3a\u7684 {fx?, fy?} \u5bf9\u8c61<\/span>
      \n\/\/ groups – \u4e00\u4e2a\u53ef\u80fd\u5d4c\u5957\u7684 Map：\u4ece\u5206\u9762\u503c\u6620\u5c04\u5230\u6570\u636e\u6570\u7ec4\u4e2d\u7684\u7d22\u5f15<\/span>
      \n\/\/ facetsIndex – \u4e00\u4e2a\u4e0e\u6709\u6548 facets \u5bf9\u5e94\u7684\u7a00\u758f\u5d4c\u5957\u7d22\u5f15\u6570\u7ec4<\/span>
      \nconst<\/span> facetStateByMark =<\/span> new<\/span> Map<\/span>(<\/span>)<\/span>;<\/span>
      \nfor<\/span> (<\/span>const<\/span> mark of<\/span> marks)<\/span> {<\/span>
      \n const<\/span> facetState =<\/span> maybeMarkFacet<\/span>(<\/span>mark,<\/span> topFacetState,<\/span> options)<\/span>;<\/span>
      \n if<\/span> (<\/span>facetState)<\/span> facetStateByMark.<\/span>set<\/span>(<\/span>mark,<\/span> facetState)<\/span>;<\/span>
      \n}<\/span><\/p>\n

      \u8fd9\u91cc\u6709\u4e2a\u5bb9\u6613\u5ffd\u7565\u7684\u7ec6\u8282：maybeMarkFacet \u5728 L505-L513 \u57cb\u4e86\u4e00\u4e2a\u8b66\u544a\u2014\u2014\u5f53 mark \u7684\u6570\u636e\u4e0e facet \u6570\u636e\u957f\u5ea6\u76f8\u540c\u4f46\u4e0d\u662f\u540c\u4e00\u4e2a\u5f15\u7528\u65f6，\u8bf4\u660e\u7528\u6237\u5f88\u53ef\u80fd\u5fd8\u4e86\u5199 facet: true，Plot \u4f1a\u628a\u8fd9\u6761\u63d0\u9192\u7d2f\u79ef\u5230 warning \u91cc（\u6700\u540e\u7edf\u4e00\u663e\u793a，\u89c1\u7b2c 21 \u6b65）\u3002<\/p>\n

      \u6b65\u9aa4 5\u20137：\u6536\u96c6\u901a\u9053\u3001\u63d2\u5165\u9690\u5f0f\u5750\u6807\u8f74\u3001\u751f\u6210 facets\u3002<\/p>\n

      \/\/ src\/plot.js L50-L53<\/span>
      \n\/\/ Compute a Map from scale name to an array of associated channels.（\u8ba1\u7b97\u4e00\u4e2a\u4ece scale \u540d\u5230\u76f8\u5173\u901a\u9053\u6570\u7ec4\u7684 Map）<\/span>
      \nconst<\/span> channelsByScale =<\/span> new<\/span> Map<\/span>(<\/span>)<\/span>;<\/span>
      \nif<\/span> (<\/span>topFacetState)<\/span> addScaleChannels<\/span>(<\/span>channelsByScale,<\/span> [<\/span>topFacetState]<\/span>,<\/span> options)<\/span>;<\/span>
      \naddScaleChannels<\/span>(<\/span>channelsByScale,<\/span> facetStateByMark,<\/span> options)<\/span>;<\/span><\/p>\n

      \u6ce8\u610f\u7b2c 5 \u6b65\u7684\u5165\u53c2\u662f stateByMark \u8fd9\u4e2a\u540d\u5b57，\u4f46\u5b9e\u9645\u4f20\u7684\u662f facetStateByMark\u2014\u2014\u56e0\u4e3a\u6b64\u65f6 mark \u8fd8\u6ca1 initialize，\u8fd8\u6ca1\u6709 channel \u53ef\u6536\u96c6\u3002\u8fd9\u4e2a\u53c2\u6570\u5728 L143 \u4f1a\u518d\u88ab\u8c03\u7528\u4e00\u6b21，\u90a3\u65f6\u624d\u662f\u771f\u6b63\u7684"\u4ece mark \u72b6\u6001\u6536\u96c6 channel"\u3002\u540c\u4e00\u4e2a\u51fd\u6570\u88ab\u8c03\u7528\u4e24\u6b21\u3001\u5582\u8fdb\u4e24\u79cd\u6570\u636e\u6e90，\u662f\u8fd9\u4efd\u4ee3\u7801\u91cc\u6700\u5bb9\u6613\u770b\u9519\u7684\u5730\u65b9\u4e4b\u4e00\u3002<\/p>\n

      \/\/ src\/plot.js L58-L63<\/span>
      \n\/\/ Add implicit axis marks. Because this happens after faceting (because it<\/span>
      \n\/\/ depends on whether faceting is present), we must initialize the facet state<\/span>
      \n\/\/ of any implicit axes, too.<\/span>
      \n\/\/ \u8bd1：\u6dfb\u52a0\u9690\u5f0f\u5750\u6807\u8f74 mark\u3002\u7531\u4e8e\u8fd9\u4e00\u6b65\u53d1\u751f\u5728\u5206\u9762\u5904\u7406\u4e4b\u540e（\u5b83\u53d6\u51b3\u4e8e\u662f\u5426\u5b58\u5728\u5206\u9762），<\/span>
      \n\/\/ \u9690\u5f0f\u8f74\u4e5f\u5fc5\u987b\u8865\u4e0a\u5404\u81ea\u7684\u5206\u9762\u72b6\u6001\u3002<\/span>
      \nconst<\/span> axes =<\/span> flatMarks<\/span>(<\/span>inferAxes<\/span>(<\/span>marks,<\/span> channelsByScale,<\/span> options)<\/span>)<\/span>;<\/span>
      \nfor<\/span> (<\/span>const<\/span> mark of<\/span> axes)<\/span> {<\/span>
      \n const<\/span> facetState =<\/span> maybeMarkFacet<\/span>(<\/span>mark,<\/span> topFacetState,<\/span> options)<\/span>;<\/span>
      \n if<\/span> (<\/span>facetState)<\/span> facetStateByMark.<\/span>set<\/span>(<\/span>mark,<\/span> facetState)<\/span>;<\/span>
      \n}<\/span>
      \nmarks.<\/span>unshift<\/span>(<\/span>…<\/span>axes)<\/span>;<\/span> \/\/ \u9690\u5f0f\u8f74\u653e\u5230\u7528\u6237 marks \u4e4b\u524d<\/span><\/p>\n

      \u7b2c 6 \u6b65\u662f"\u96f6\u914d\u7f6e\u51fa\u56fe"\u7684\u5173\u952e\u4e00\u73af：inferAxes \u4f1a\u6839\u636e channelsByScale \u91cc\u6709\u6ca1\u6709 x\/y，\u51b3\u5b9a\u8981\u4e0d\u8981\u63d2\u5165 axisX\/axisY\/gridX\/gridY（\u7b2c 9 \u7ae0\u8be6\u89e3）\u3002\u751f\u6210\u7684\u8f74 mark \u4e5f\u8981\u8865\u4e00\u904d facet \u72b6\u6001，\u56e0\u4e3a\u5b83\u4eec\u540c\u6837\u662f mark\u3002<\/p>\n

      marks.unshift(…axes) \u7528 unshift \u800c\u4e0d\u662f push \u662f\u6709\u610f\u7684：\u5750\u6807\u8f74\u8981\u753b\u5728\u56fe\u5f62\u4e4b\u4e0b，\u800c SVG \u7684\u7ed8\u5236\u987a\u5e8f\u7b49\u4e8e DOM \u987a\u5e8f，\u6240\u4ee5\u5fc5\u987b\u5148\u6e32\u67d3\u3002\u8fd9\u4e00\u4e2a\u65b9\u6cd5\u540d\u7684\u9009\u62e9，\u51b3\u5b9a\u4e86"\u7f51\u683c\u7ebf\u4e0d\u4f1a\u906e\u4f4f\u6570\u636e\u70b9"\u3002<\/p>\n

      5.4 \u9636\u6bb5 B：\u521d\u59cb\u5316\u4e0e\u6bd4\u4f8b\u5c3a（\u6b65\u9aa4 8\u201312）<\/h6>\n

      \u6b65\u9aa4 8：\u6570\u636e\u7269\u5316\u3002 \u8fd9\u662f"\u58f0\u660e"\u53d8\u6210"\u6570\u636e"\u7684\u4e00\u6b65：<\/p>\n

      \/\/ src\/plot.js L133-L140<\/span>
      \n\/\/ Initialize the marks\u2019 state.（\u521d\u59cb\u5316\u5404\u4e2a mark \u7684\u72b6\u6001）<\/span>
      \nfor<\/span> (<\/span>const<\/span> mark of<\/span> marks)<\/span> {<\/span>
      \n if<\/span> (<\/span>stateByMark.<\/span>has<\/span>(<\/span>mark)<\/span>)<\/span> throw<\/span> new<\/span> Error<\/span>(<\/span>"duplicate mark; each mark must be unique"<\/span>)<\/span>;<\/span>
      \n const<\/span> {<\/span>facetsIndex,<\/span> channels<\/span>:<\/span> facetChannels}<\/span> =<\/span> facetStateByMark.<\/span>get<\/span>(<\/span>mark)<\/span> ??<\/span> {<\/span>}<\/span>;<\/span>
      \n const<\/span> {<\/span>data,<\/span> facets,<\/span> channels}<\/span> =<\/span> mark.<\/span>initialize<\/span>(<\/span>facetsIndex,<\/span> facetChannels,<\/span> options)<\/span>;<\/span>
      \n applyScaleTransforms<\/span>(<\/span>channels,<\/span> options)<\/span>;<\/span>
      \n stateByMark.<\/span>set<\/span>(<\/span>mark,<\/span> {<\/span>data,<\/span> facets,<\/span> channels}<\/span>)<\/span>;<\/span>
      \n}<\/span><\/p>\n

      \u4e09\u4ef6\u4e8b\u503c\u5f97\u8bb0\u4f4f：<\/p>\n

    • \u540c\u4e00\u4e2a mark \u5b9e\u4f8b\u4e0d\u80fd\u51fa\u73b0\u5728 marks \u91cc\u4e24\u6b21，\u5426\u5219\u76f4\u63a5\u629b\u9519（duplicate mark; each mark must be unique）\u3002\u8fd9\u89e3\u91ca\u4e86\u4e00\u4e2a\u5e38\u89c1\u56f0\u60d1：\u4e3a\u4ec0\u4e48\u628a\u4e00\u4e2a mark \u53d8\u91cf\u540c\u65f6\u7528\u4e8e\u4e24\u4e2a\u56fe\u4f1a\u51fa\u95ee\u9898\u2014\u2014\u4e0d\u662f"\u590d\u5236"，\u800c\u662f"\u590d\u7528\u4e86\u540c\u4e00\u4e2a\u72b6\u6001\u69fd"\u3002<\/li>\n
    • mark.initialize \u5185\u90e8\u4f1a\u5148\u8dd1 transform\u3001\u518d\u5efa channels（\u7b2c 7 \u7ae0），\u6240\u4ee5\u8fd9\u91cc\u62ff\u5230\u7684 data \u5df2\u7ecf\u88ab\u8fc7\u6ee4\/\u5206\u6876\/\u5806\u53e0\u8fc7\u4e86\u3002<\/li>\n
    • applyScaleTransforms \u4f1a\u628a x: {percent: true} \u8fd9\u7c7b"\u6bd4\u4f8b\u5c3a\u7ea7\u7684\u6570\u503c\u53d8\u6362"\u5e94\u7528\u5230 channel \u503c\u4e0a，\u5e76\u628a channel.transform \u7f6e\u4e3a false，\u907f\u514d\u7b2c 17 \u6b65\u91cd\u590d\u5e94\u7528\u3002<\/li>\n

      \u6b65\u9aa4 9\u201312：\u6bd4\u4f8b\u5c3a\u4e0e\u5c3a\u5bf8\u3002<\/p>\n

      \/\/ src\/plot.js L143-L151<\/span>
      \n\/\/ Initialize the scales and dimensions.（\u521d\u59cb\u5316\u6bd4\u4f8b\u5c3a\u4e0e\u5c3a\u5bf8）<\/span>
      \nconst<\/span> scaleDescriptors =<\/span> createScales<\/span>(<\/span>addScaleChannels<\/span>(<\/span>channelsByScale,<\/span> stateByMark,<\/span> options)<\/span>,<\/span> options)<\/span>;<\/span>
      \nconst<\/span> dimensions =<\/span> createDimensions<\/span>(<\/span>scaleDescriptors,<\/span> marks,<\/span> options)<\/span>;<\/span><\/p>\n

      autoScaleRange<\/span>(<\/span>scaleDescriptors,<\/span> dimensions)<\/span>;<\/span><\/p>\n

      const<\/span> scales =<\/span> createScaleFunctions<\/span>(<\/span>scaleDescriptors)<\/span>;<\/span>
      \nconst<\/span> {<\/span>fx,<\/span> fy}<\/span> =<\/span> scales;<\/span>
      \nconst<\/span> subdimensions =<\/span> fx ||<\/span> fy ?<\/span> innerDimensions<\/span>(<\/span>scaleDescriptors,<\/span> dimensions)<\/span> :<\/span> dimensions;<\/span>
      \nconst<\/span> superdimensions =<\/span> fx ||<\/span> fy ?<\/span> actualDimensions<\/span>(<\/span>scales,<\/span> dimensions)<\/span> :<\/span> dimensions;<\/span><\/p>\n

      \u8fd9\u56db\u6b65\u7684\u987a\u5e8f\u4e0d\u53ef\u4ea4\u6362，\u539f\u56e0\u73af\u73af\u76f8\u6263：<\/p>\n

    • createScales \u9700\u8981\u5b8c\u6574\u7684 channelsByScale（\u6240\u4ee5\u5fc5\u987b\u5728\u7b2c 8 \u6b65\u4e4b\u540e）\u2192 \u4ea7\u51fa ScaleDescriptor（\u542b domain，\u4f46\u4e0d\u542b range）；<\/li>\n
    • createDimensions \u9700\u8981 scale \u6765\u5224\u65ad y \u8f74\u7c7b\u522b\u6570（\u51b3\u5b9a\u9ed8\u8ba4\u9ad8\u5ea6\u662f 20px \u00d7 n \u8fd8\u662f 60px + 20px \u00d7 n）\u2192 \u4ea7\u51fa\u753b\u5e03\u5c3a\u5bf8\u4e0e\u8fb9\u8ddd；<\/li>\n
    • autoScaleRange \u9700\u8981 dimensions \u624d\u80fd\u7b97\u51fa position scale \u7684 range（[marginLeft, width – marginRight]）\u2014\u2014\u8fd9\u5c31\u662f"range"\u4e0e"\u5c3a\u5bf8"\u4e4b\u95f4\u7684\u5faa\u73af\u4f9d\u8d56，\u53ea\u80fd\u9760"\u5148\u5c3a\u5bf8\u540e range"\u6253\u7834；<\/li>\n
    • createScaleFunctions \u624d\u628a descriptor \u5b9e\u4f8b\u5316\u6210\u53ef\u8c03\u7528\u7684\u51fd\u6570\u3002<\/li>\n

      \u7b2c 11 \u6b65\u7684\u6ce8\u91ca \/\/ position scale \u81ea\u52a8 range \u5c31\u662f\u8fd9\u6761\u56e0\u679c\u94fe\u7684\u5750\u6807\u3002\u7b2c 6 \u7ae0\u4f1a\u628a\u7b2c 9\u201312 \u6b65\u5b8c\u6574\u91cd\u6f14\u4e00\u904d\u3002<\/p>\n

      \u53e6\u5916\u6ce8\u610f subdimensions \/ superdimensions \u7684\u533a\u5206：\u5206\u9762\u65f6，\u6bcf\u4e2a facet \u5185\u90e8\u7528\u7684\u662f subdimensions（\u7a84\/\u77ee），\u800c frame \u8fd9\u7c7b"\u8de8\u8d8a\u6240\u6709 facet"\u7684 mark \u7528 superdimensions（\u6574\u4f53\u5c3a\u5bf8）\u3002\u4e00\u4e2a mark \u7528\u54ea\u4e00\u5957，\u53d6\u51b3\u4e8e\u5b83\u7684 facet \u662f\u5426\u4e3a "super"（\u7b2c 13 \u7ae0\u6709\u5b9e\u4f8b）\u3002<\/p>\n

      5.5 \u9636\u6bb5 C：\u73af\u5883\u4e0e\u4e8c\u9636\u901a\u9053（\u6b65\u9aa4 13\u201316）<\/h6>\n

      \u6b65\u9aa4 13：\u521b\u5efa\u6e32\u67d3\u4e0a\u4e0b\u6587\u3002<\/p>\n

      \/\/ src\/plot.js L154-L170（\u8282\u9009）<\/span>
      \n\/\/ Initialize the context.（\u521d\u59cb\u5316\u4e0a\u4e0b\u6587）<\/span>
      \nconst<\/span> context =<\/span> createContext<\/span>(<\/span>options)<\/span>;<\/span>
      \nconst<\/span> document =<\/span> context.<\/span>document;<\/span>
      \nconst<\/span> svg =<\/span> creator<\/span>(<\/span>"svg"<\/span>)<\/span>.<\/span>call<\/span>(<\/span>document.<\/span>documentElement)<\/span>;<\/span>
      \nlet<\/span> figure =<\/span> svg;<\/span> \/\/ replaced with the figure element, if any（\u4e4b\u540e\u82e5\u751f\u6210 figure \u5143\u7d20，\u6b64\u5f15\u7528\u4f1a\u88ab\u66ff\u6362）<\/span>
      \ncontext.<\/span>ownerSVGElement =<\/span> svg;<\/span>
      \ncontext.<\/span>className =<\/span> className;<\/span>
      \ncontext.<\/span>projection =<\/span> createProjection<\/span>(<\/span>options,<\/span> subdimensions)<\/span>;<\/span><\/p>\n

      \/\/ A path generator for marks that want to draw GeoJSON.（\u4e00\u4e2a\u4f9b\u9700\u8981\u7ed8\u5236 GeoJSON \u7684 mark \u4f7f\u7528\u7684\u8def\u5f84\u751f\u6210\u5668）<\/span>
      \ncontext.<\/span>path<\/span> =<\/span> function<\/span> (<\/span>)<\/span> {<\/span>
      \n return<\/span> geoPath<\/span>(<\/span>this<\/span>.<\/span>projection ??<\/span> xyProjection<\/span>(<\/span>scales)<\/span>)<\/span>;<\/span>
      \n}<\/span>;<\/span><\/p>\n

      💡 PS：\u88ab\u8282\u9009\u7701\u7565\u7684\u540e\u4e09\u4e2a\u80fd\u529b，\u6e90\u7801\u91cc\u5404\u914d\u4e86\u4e00\u53e5\u6ce8\u91ca\u2014\u2014filterFacets：\u201cAllows e.g. the axis mark to determine faceting lazily.\u201d（\u8ba9\u5750\u6807\u8f74\u8fd9\u7c7b mark \u80fd\u60f0\u6027\u786e\u5b9a\u5206\u9762）；getMarkState：\u201cAllows e.g. the tip mark to reference channels and data on other marks.\u201d（\u8ba9 tip mark \u80fd\u5f15\u7528\u5176\u4ed6 mark \u7684\u901a\u9053\u4e0e\u6570\u636e）；dispatchValue：\u201cAllows e.g. the pointer transform to support viewof.\u201d（\u8ba9 pointer \u4ea4\u4e92\u53d8\u6362\u652f\u6301 Observable \u7684 viewof）\u3002<\/p>\n

      context \u672c\u8eab\u53ea\u662f {document, clip}（context.js \u5168\u6587\u53ea\u6709 11 \u884c），\u4f46 plot.js \u5728\u8fd9\u91cc\u7ed9\u5b83\u6302\u4e0a\u4e86 6 \u4e2a\u80fd\u529b：ownerSVGElement\u3001className\u3001projection\u3001path\u3001filterFacets\u3001getMarkState\u3001dispatchValue\u3002\u8fd9\u5c31\u662f\u7b2c 4 \u7ae0\u8bf4\u7684"\u4f9d\u8d56\u6ce8\u5165\u5f0f\u73af\u5883"\u2014\u2014\u6838\u5fc3\u4ee3\u7801\u53ea\u4f9d\u8d56 context \u8fd9\u4e2a\u63a5\u53e3，\u4e0d\u76f4\u63a5\u78b0 window \u6216 document，\u56e0\u6b64\u53ef\u4ee5\u5728 Node\/jsdom \u91cc\u8dd1\u6d4b\u8bd5\u3002<\/p>\n

      context.path \u7528 this \u800c\u4e0d\u662f\u95ed\u5305\u53d8\u91cf，\u662f\u4e3a\u4e86\u8ba9\u6bcf\u4e2a mark \u62ff\u5230\u5c5e\u4e8e\u81ea\u5df1\u7684\u8def\u5f84\u751f\u6210\u5668（this.projection \u53ef\u4ee5\u88ab mark \u8986\u76d6）\u3002<\/p>\n

      \u6b65\u9aa4 14：initializer（\u4e8c\u9636\u901a\u9053）\u3002 \u6709\u4e9b channel \u65e0\u6cd5\u5728\u6570\u636e\u7269\u5316\u9636\u6bb5\u7b97\u51fa\u6765，\u5fc5\u987b\u7b49\u6bd4\u4f8b\u5c3a\u548c\u4e0a\u4e0b\u6587\u5c31\u7eea\u3002\u5178\u578b\u4f8b\u5b50\u662f\u5750\u6807\u8f74\u7684\u523b\u5ea6\u4f4d\u7f6e（\u8981\u77e5\u9053\u5c3a\u5bf8）\u3001hexbin \u7684\u7f51\u683c\u5bf9\u9f50\u3002plot.js \u4e3a\u8fd9\u7c7b mark \u7559\u4e86\u4e00\u4e2a"\u7b2c\u4e8c\u6b21\u673a\u4f1a"：<\/p>\n

      \/\/ src\/plot.js L188-L213（\u8282\u9009）<\/span>
      \n\/\/ Reinitialize; for deriving channels dependent on other channels.（\u91cd\u65b0\u521d\u59cb\u5316；\u7528\u4e8e\u6d3e\u751f\u4f9d\u8d56\u5176\u4ed6\u901a\u9053\u7684\u901a\u9053）<\/span>
      \nfor<\/span> (<\/span>const<\/span> [<\/span>mark,<\/span> state]<\/span> of<\/span> stateByMark)<\/span> {<\/span>
      \n if<\/span> (<\/span>mark.<\/span>initializer !=<\/span> null<\/span>)<\/span> {<\/span>
      \n const<\/span> dimensions =<\/span> mark.<\/span>facet ===<\/span> "super"<\/span> ?<\/span> superdimensions :<\/span> subdimensions;<\/span>
      \n const<\/span> update =<\/span> mark.<\/span>initializer<\/span>(<\/span>state.<\/span>data,<\/span> state.<\/span>facets,<\/span> state.<\/span>channels,<\/span> scales,<\/span> dimensions,<\/span> context)<\/span>;<\/span>
      \n if<\/span> (<\/span>update.<\/span>data !==<\/span> undefined<\/span>)<\/span> state.<\/span>data =<\/span> update.<\/span>data;<\/span>
      \n if<\/span> (<\/span>update.<\/span>facets !==<\/span> undefined<\/span>)<\/span> state.<\/span>facets =<\/span> update.<\/span>facets;<\/span>
      \n if<\/span> (<\/span>update.<\/span>channels !==<\/span> undefined<\/span>)<\/span> {<\/span>
      \n const<\/span> {<\/span>fx,<\/span> fy,<\/span> …<\/span>channels}<\/span> =<\/span> update.<\/span>channels;<\/span> \/\/ separate facet channels（\u628a facet \u901a\u9053\u5206\u79bb\u51fa\u6765）<\/span>
      \n inferChannelScales<\/span>(<\/span>channels)<\/span>;<\/span>
      \n Object.<\/span>assign<\/span>(<\/span>state.<\/span>channels,<\/span> channels)<\/span>;<\/span>
      \n for<\/span> (<\/span>const<\/span> channel of<\/span> Object.<\/span>values<\/span>(<\/span>channels)<\/span>)<\/span> {<\/span>
      \n const<\/span> {<\/span>scale}<\/span> =<\/span> channel;<\/span>
      \n \/\/ Initializers aren\u2019t allowed to redefine position scales as this<\/span>
      \n \/\/ would introduce a circular dependency; so simply scale these<\/span>
      \n \/\/ channels as-is rather than creating new scales, and assume that<\/span>
      \n \/\/ they already have the scale\u2019s transform applied, if any (e.g., when<\/span>
      \n \/\/ generating ticks for the axis mark).<\/span>
      \n \/\/ \u8bd1：\u4e0d\u5141\u8bb8 initializer \u91cd\u65b0\u5b9a\u4e49\u4f4d\u7f6e\u6bd4\u4f8b\u5c3a，\u5426\u5219\u4f1a\u5f15\u5165\u5faa\u73af\u4f9d\u8d56；\u56e0\u6b64\u8fd9\u4e9b\u901a\u9053<\/span>
      \n \/\/ \u6309\u539f\u6837\u7f29\u653e\u3001\u4e0d\u521b\u5efa\u65b0 scale，\u5e76\u5047\u5b9a\u5b83\u4eec\u5df2\u5e94\u7528\u8fc7 scale \u7684 transform（\u82e5\u6709，<\/span>
      \n \/\/ \u4f8b\u5982\u4e3a\u5750\u6807\u8f74 mark \u751f\u6210\u523b\u5ea6\u65f6）\u3002<\/span>
      \n if<\/span> (<\/span>scale !=<\/span> null<\/span> &&<\/span> !<\/span>isPosition<\/span>(<\/span>scaleRegistry.<\/span>get<\/span>(<\/span>scale)<\/span>)<\/span>)<\/span> {<\/span>
      \n applyScaleTransform<\/span>(<\/span>channel,<\/span> options)<\/span>;<\/span>
      \n newByScale.<\/span>add<\/span>(<\/span>scale)<\/span>;<\/span>
      \n }<\/span>
      \n }<\/span><\/p>\n

      \u4e09\u4e2a\u5173\u952e\u7ea6\u675f：<\/p>\n

        \n
      • initializer \u53ea\u80fd\u65b0\u589e\u975e\u4f4d\u7f6e\u901a\u9053（isPosition \u5224\u65ad）\u3002\u539f\u56e0\u5f88\u76f4\u767d：\u4f4d\u7f6e\u6bd4\u4f8b\u5c3a\u7684 domain \u5df2\u7ecf\u7528\u6765\u7b97\u5c3a\u5bf8\u4e86，\u5982\u679c\u6b64\u523b\u8fd8\u80fd\u6539，\u5c31\u51fa\u73b0"\u5c3a\u5bf8 \u2194 domain"\u7684\u5faa\u73af\u4f9d\u8d56\u3002\u6e90\u7801\u6ce8\u91ca\u5199\u5f97\u6bd4\u4efb\u4f55\u6587\u6863\u90fd\u6e05\u695a\u3002<\/li>\n
      • initializer \u4e0d\u80fd\u5b9a\u4e49 transform（basic.js \u91cc\u4f1a\u629b transforms cannot be applied after initializers）\u3002\u56e0\u4e3a\u6570\u636e\u6b64\u523b\u5df2\u7ecf\u88ab\u7269\u5316，\u518d\u6539\u6570\u636e\u4f1a\u8ba9\u5df2\u7b97\u597d\u7684\u6bd4\u4f8b\u5c3a\u5931\u6548\u3002<\/li>\n
      • \u65b0\u589e\u7684\u975e\u4f4d\u7f6e\u901a\u9053\u5982\u679c\u5e26 scale，\u4f1a\u88ab\u8bb0\u8fdb newByScale，\u5e76\u5728\u7b2c 15 \u6b65\u89e6\u53d1\u4e00\u6b21"\u6309\u9700\u91cd\u5efa"\u3002<\/li>\n<\/ul>\n

        \u6b65\u9aa4 15：\u6309\u9700\u91cd\u5efa scales\u3002<\/p>\n

        \/\/ src\/plot.js L224-L233<\/span>
        \n\/\/ Reconstruct scales if new scaled channels were created during<\/span>
        \n\/\/ reinitialization. Preserve existing scale labels, if any.<\/span>
        \n\/\/ \u8bd1：\u82e5\u91cd\u65b0\u521d\u59cb\u5316\u671f\u95f4\u4ea7\u751f\u4e86\u65b0\u7684\u5e26 scale \u901a\u9053，\u5219\u91cd\u5efa\u6bd4\u4f8b\u5c3a；\u5e76\u4fdd\u7559\u5df2\u6709\u7684 scale \u6807\u7b7e（\u82e5\u6709）\u3002<\/span>
        \nif<\/span> (<\/span>newByScale.<\/span>size)<\/span> {<\/span>
        \n const<\/span> newChannelsByScale =<\/span> new<\/span> Map<\/span>(<\/span>)<\/span>;<\/span>
        \n addScaleChannels<\/span>(<\/span>newChannelsByScale,<\/span> stateByMark,<\/span> options,<\/span> (<\/span>key<\/span>)<\/span> =><\/span> newByScale.<\/span>has<\/span>(<\/span>key)<\/span>)<\/span>;<\/span>
        \n addScaleChannels<\/span>(<\/span>channelsByScale,<\/span> stateByMark,<\/span> options,<\/span> (<\/span>key<\/span>)<\/span> =><\/span> newByScale.<\/span>has<\/span>(<\/span>key)<\/span>)<\/span>;<\/span>
        \n const<\/span> newScaleDescriptors =<\/span> inheritScaleLabels<\/span>(<\/span>createScales<\/span>(<\/span>newChannelsByScale,<\/span> options)<\/span>,<\/span> scaleDescriptors)<\/span>;<\/span>
        \n const<\/span> {<\/span>scales<\/span>:<\/span> newExposedScales,<\/span> …<\/span>newScales}<\/span> =<\/span> createScaleFunctions<\/span>(<\/span>newScaleDescriptors)<\/span>;<\/span>
        \n Object.<\/span>assign<\/span>(<\/span>scaleDescriptors,<\/span> newScaleDescriptors)<\/span>;<\/span>
        \n Object.<\/span>assign<\/span>(<\/span>scales,<\/span> newScales)<\/span>;<\/span>
        \n Object.<\/span>assign<\/span>(<\/span>scales.<\/span>scales,<\/span> newExposedScales)<\/span>;<\/span>
        \n}<\/span><\/p>\n

        \u8fd9\u662f\u5168\u6d41\u7a0b\u552f\u4e00\u4e00\u5904"\u56de\u5934\u91cd\u505a"\u3002\u5b83\u505a\u4e86\u4e09\u4ef6\u5f88\u8bb2\u7a76\u7684\u4e8b：\u53ea\u91cd\u5efa\u53d7\u5f71\u54cd\u7684 scale（\u7528 filter \u51fd\u6570 newByScale.has \u8fc7\u6ee4）\u3001\u4fdd\u7559\u539f\u6709 label（inheritScaleLabels，\u5426\u5219\u7b2c 9 \u6b65\u63a8\u65ad\u51fa\u6765\u7684\u8f74\u6807\u9898\u4f1a\u4e22）\u3001\u7528 Object.assign \u539f\u5730\u66f4\u65b0\u5bf9\u8c61（\u56e0\u4e3a scales \u7684\u5f15\u7528\u5df2\u7ecf\u88ab\u95ed\u5305\u6355\u83b7，\u6362\u65b0\u5bf9\u8c61\u4f1a\u5bfc\u81f4 Figure \u4e0a\u66b4\u9732\u7684 .scale() \u4e0e\u5b9e\u9645\u6e32\u67d3\u7528\u7684\u4e0d\u662f\u540c\u4e00\u4e2a）\u3002<\/p>\n

        \u6b65\u9aa4 16：\u6309\u6700\u7ec8 domain \u91cd\u6392 facets\u3002<\/p>\n

        \/\/ src\/plot.js L238-L242<\/span>
        \n\/\/ Sort and filter the facets to match the fx and fy domains; this is needed<\/span>
        \n\/\/ because the facets were constructed prior to the fx and fy scales.<\/span>
        \n\/\/ \u8bd1：\u6392\u5e8f\u5e76\u8fc7\u6ee4 facets \u4f7f\u5176\u4e0e fx\/fy \u7684 domain \u4e00\u81f4；\u4e4b\u6240\u4ee5\u9700\u8981\u8fd9\u4e00\u6b65，\u662f\u56e0\u4e3a facets<\/span>
        \n\/\/ \u662f\u5728 fx\/fy \u6bd4\u4f8b\u5c3a\u4e4b\u524d\u6784\u5efa\u7684\u3002<\/span>
        \nif<\/span> (<\/span>facets !==<\/span> undefined<\/span>)<\/span> {<\/span>
        \n facetDomains =<\/span> {<\/span>x<\/span>:<\/span> fx?.<\/span>domain<\/span>(<\/span>)<\/span>,<\/span> y<\/span>:<\/span> fy?.<\/span>domain<\/span>(<\/span>)<\/span>}<\/span>;<\/span>
        \n facets =<\/span> recreateFacets<\/span>(<\/span>facets,<\/span> facetDomains)<\/span>;<\/span>
        \n facetTranslate =<\/span> facetTranslator<\/span>(<\/span>fx,<\/span> fy,<\/span> dimensions)<\/span>;<\/span>
        \n}<\/span><\/p>\n

        \u7b2c 7 \u6b65\u521b\u5efa facets \u65f6，fx\/fy \u7684 domain \u8fd8\u53ea\u662f"\u521d\u6b65\u63a8\u65ad"；\u7ecf\u8fc7\u7b2c 9\u201311 \u6b65\u7684 scale \u8ba1\u7b97（\u53ef\u80fd\u88ab\u7528\u6237\u663e\u5f0f domain \u8986\u76d6\u3001\u53ef\u80fd\u88ab nice \u5706\u6574），\u771f\u5b9e domain \u624d\u786e\u5b9a\u3002recreateFacets \u4f1a\u5220\u6389 domain \u91cc\u5df2\u4e0d\u5b58\u5728\u7684\u683c\u5b50\u5e76\u6309\u65b0\u987a\u5e8f\u91cd\u6392\u2014\u2014\u8fd9\u6b63\u662f"\u7a7a\u767d\u5206\u9762\u4e0d\u518d\u663e\u793a"\u7684\u5b9e\u73b0\u4f4d\u7f6e\u3002<\/p>\n

        5.6 \u9636\u6bb5 D：\u7f29\u653e\u4e0e\u6e32\u67d3（\u6b65\u9aa4 17\u201319）<\/h6>\n

        \u6b65\u9aa4 17：\u5e94\u7528\u6bd4\u4f8b\u5c3a\u3002<\/p>\n

        \/\/ src\/plot.js L244-L247<\/span>
        \n\/\/ Compute value objects, applying scales and projection as needed.（\u8ba1\u7b97 value \u5bf9\u8c61，\u6309\u9700\u5e94\u7528\u6bd4\u4f8b\u5c3a\u4e0e\u6295\u5f71）<\/span>
        \nfor<\/span> (<\/span>const<\/span> [<\/span>mark,<\/span> state]<\/span> of<\/span> stateByMark)<\/span> {<\/span>
        \n state.<\/span>values =<\/span> mark.<\/span>scale<\/span>(<\/span>state.<\/span>channels,<\/span> scales,<\/span> context)<\/span>;<\/span>
        \n}<\/span><\/p>\n

        \u4e00\u884c\u8c03\u7528\u80cc\u540e\u662f\u7b2c 4 \u7ae0\u8bb2\u8fc7\u7684 valueObject：\u628a channels.x.value = [12, 15, 23] \u53d8\u6210 values.x = [64.3, 128.6, …]（\u50cf\u7d20\u503c）\u3002\u6ce8\u610f\u5b83\u5728 render \u4e4b\u524d\u7edf\u4e00\u505a\u5b8c\u5168\u90e8 mark，\u800c\u4e0d\u662f\u6bcf\u4e2a mark \u6e32\u67d3\u65f6\u5404\u81ea\u7b97\u2014\u2014\u8fd9\u4fdd\u8bc1\u4e86\u540c\u7c7b\u56fe\u5f62\u5728\u753b\u5e03\u4e0a\u7684\u4e00\u81f4\u6027\u3002<\/p>\n

        \u6b65\u9aa4 18：\u6784\u5efa svg \u6839\u5143\u7d20\u3002<\/p>\n

        \/\/ src\/plot.js L251-L278（\u8282\u9009）<\/span>
        \nselect<\/span>(<\/span>svg)<\/span>
        \n .<\/span>attr<\/span>(<\/span>"class"<\/span>,<\/span> className)<\/span>
        \n .<\/span>attr<\/span>(<\/span>"fill"<\/span>,<\/span> "currentColor"<\/span>)<\/span>
        \n .<\/span>attr<\/span>(<\/span>"font-family"<\/span>,<\/span> "system-ui, sans-serif"<\/span>)<\/span>
        \n .<\/span>attr<\/span>(<\/span>"font-size"<\/span>,<\/span> 10<\/span>)<\/span>
        \n .<\/span>attr<\/span>(<\/span>"text-anchor"<\/span>,<\/span> "middle"<\/span>)<\/span>
        \n .<\/span>attr<\/span>(<\/span>"width"<\/span>,<\/span> width)<\/span>
        \n .<\/span>attr<\/span>(<\/span>"height"<\/span>,<\/span> height)<\/span>
        \n .<\/span>attr<\/span>(<\/span>"viewBox"<\/span>,<\/span> `<\/span>0 0 <\/span>${<\/span>width}<\/span><\/span> <\/span>${<\/span>height}<\/span><\/span>`<\/span><\/span>)<\/span>
        \n .<\/span>attr<\/span>(<\/span>"aria-label"<\/span>,<\/span> ariaLabel)<\/span>
        \n .<\/span>attr<\/span>(<\/span>"aria-description"<\/span>,<\/span> ariaDescription)<\/span>
        \n .<\/span>call<\/span>(<\/span>(<\/span>svg<\/span>)<\/span> =><\/span>
        \n \/\/ Warning: if you edit this, change defaultClassName.（\u8b66\u544a：\u82e5\u4fee\u6539\u8fd9\u91cc，\u8bf7\u540c\u6b65\u4fee\u6539 defaultClassName\u3002）<\/span>
        \n svg.<\/span>append<\/span>(<\/span>"style"<\/span>)<\/span>.<\/span>text<\/span>(<\/span>`<\/span>:where(.<\/span>${<\/span>className}<\/span><\/span>) { –plot-background: white; … }<\/span>`<\/span><\/span>)<\/span>
        \n )<\/span>
        \n .<\/span>call<\/span>(<\/span>applyInlineStyles,<\/span> style)<\/span>;<\/span><\/p>\n

        💡 PS：\u90a3\u53e5 Warning \u6307\u5411 style.js \u91cc\u7684 defaultClassName \u5e38\u91cf\u2014\u2014\u6ce8\u5165\u7684\u5185\u8054 <style> \u7528 :where(.${className}) \u9009\u62e9\u5668\u5339\u914d\u7c7b\u540d，\u4e24\u5904\u5fc5\u987b\u540c\u6b65；\u82e5\u53ea\u6539\u4e00\u5904，\u9ed8\u8ba4\u6837\u5f0f\u4f1a\u9759\u9ed8\u5931\u6548\u3002<\/p>\n

        \u8fd9\u91cc\u900f\u9732\u4e86 Plot \u7684\u6837\u5f0f\u7b56\u7565：\u6839\u5143\u7d20\u4e0a\u6302\u4e00\u90e8\u5206\u9ed8\u8ba4\u503c（\u5b57\u4f53\u3001\u6587\u5b57\u951a\u70b9\u3001currentColor），\u518d\u6ce8\u5165\u4e00\u6bb5 CSS \u53d8\u91cf，\u5176\u4f59\u5c5e\u6027\u4ea4\u7ed9\u6bcf\u4e2a mark\u3002fill: currentColor \u5c24\u5176\u5173\u952e\u2014\u2014\u5b83\u8ba9\u6240\u6709\u56fe\u5f62\u9ed8\u8ba4\u7ee7\u627f\u6587\u5b57\u989c\u8272，\u4ece\u800c"\u8ddf\u968f\u4e3b\u9898\u8272"，\u4e5f\u5c31\u6709\u4e86 stroke: "currentColor" \u8fd9\u79cd\u5199\u6cd5（\u56de\u5934\u770b dot.js \u7684 defaults）\u3002<\/p>\n

        \u6b65\u9aa4 19：\u6e32\u67d3\u6bcf\u4e2a mark\u3002 \u5206\u652f\u903b\u8f91\u53ea\u6709\u4e24\u6bb5，\u4f46\u8986\u76d6\u4e86 facet \u7684\u5168\u90e8\u60c5\u5f62：<\/p>\n

        \/\/ src\/plot.js L281-L294（\u975e\u5206\u9762\u5206\u652f）<\/span>
        \n\/\/ Render marks.（\u6e32\u67d3\u5404\u4e2a mark）<\/span>
        \nfor<\/span> (<\/span>const<\/span> mark of<\/span> marks)<\/span> {<\/span>
        \n const<\/span> {<\/span>channels,<\/span> values,<\/span> facets<\/span>:<\/span> indexes}<\/span> =<\/span> stateByMark.<\/span>get<\/span>(<\/span>mark)<\/span>;<\/span>
        \n \/\/ Render a non-faceted mark.（\u6e32\u67d3\u975e\u5206\u9762\u7684 mark）<\/span>
        \n if<\/span> (<\/span>facets ===<\/span> undefined<\/span> ||<\/span> mark.<\/span>facet ===<\/span> "super"<\/span>)<\/span> {<\/span>
        \n let<\/span> index =<\/span> null<\/span>;<\/span>
        \n if<\/span> (<\/span>indexes)<\/span> {<\/span>
        \n index =<\/span> indexes[<\/span>0<\/span>]<\/span>;<\/span>
        \n index =<\/span> mark.<\/span>filter<\/span>(<\/span>index,<\/span> channels,<\/span> values)<\/span>;<\/span> \/\/ \u8fc7\u6ee4 undefined \u7b49\u65e0\u6548\u503c<\/span>
        \n if<\/span> (<\/span>index.<\/span>length ===<\/span> 0<\/span>)<\/span> continue<\/span>;<\/span>
        \n }<\/span>
        \n const<\/span> node =<\/span> mark.<\/span>render<\/span>(<\/span>index,<\/span> scales,<\/span> values,<\/span> superdimensions,<\/span> context)<\/span>;<\/span>
        \n if<\/span> (<\/span>node ==<\/span> null<\/span>)<\/span> continue<\/span>;<\/span>
        \n svg.<\/span>appendChild<\/span>(<\/span>node)<\/span>;<\/span>
        \n }<\/span>
        \n \/\/ …\u5206\u9762\u5206\u652f\u89c1 L297-L327（\u6e90\u7801\u6ce8\u91ca：\/\/ Render a faceted mark. \u6e32\u67d3\u5206\u9762\u7684 mark）<\/span>
        \n}<\/span><\/p>\n

        \u4e09\u4e2a\u7ec6\u8282：\u2460 mark.filter \u662f\u6bcf\u4e2a facet \u5355\u72ec\u8c03\u7528\u7684，\u5b83\u9ed8\u8ba4\u8fc7\u6ee4\u6389\u503c\u4e3a undefined \u7684\u8bb0\u5f55（defined），\u8fd9\u5c31\u662f"\u6570\u636e\u91cc\u7684 NaN \u4e0d\u4f1a\u753b\u51fa\u70b9"\u7684\u539f\u56e0；\u2461 node == null \u65f6\u8df3\u8fc7，\u5141\u8bb8 mark \u7528 render \u8fd4\u56de null \u8868\u793a"\u672c\u6b21\u4e0d\u753b"；\u2462 \u5206\u9762\u5206\u652f\u91cc\u6709\u4e00\u6bb5 subarray(index) \u7684\u62f7\u8d1d\u548c index.fx \/ index.fy \/ index.fi \u7684\u8d4b\u503c\u2014\u2014\u7d22\u5f15\u6570\u7ec4\u88ab\u5f53\u6210"\u5e26\u6807\u6ce8\u7684\u6570\u7ec4"\u4f7f\u7528，\u628a facet \u4fe1\u606f\u76f4\u63a5\u6302\u5728\u6570\u7ec4\u5bf9\u8c61\u4e0a，\u907f\u514d\u518d\u4f20\u4e00\u4e2a\u53c2\u6570\u3002<\/p>\n

        5.7 \u9636\u6bb5 E：\u5305\u88c5\u4e0e\u8f93\u51fa（\u6b65\u9aa4 20\u201321）<\/h6>\n

        \u6b65\u9aa4 20：\u56fe\u4f8b\u4e0e figure \u5305\u88c5\u3002<\/p>\n

        \/\/ src\/plot.js L330-L341（\u8282\u9009）<\/span>
        \n\/\/ Wrap the plot in a figure, if needed.（\u5982\u6709\u9700\u8981，\u628a\u6574\u5f20\u56fe\u5305\u8fdb figure \u5143\u7d20）<\/span>
        \nconst<\/span> legends =<\/span> createLegends<\/span>(<\/span>scaleDescriptors,<\/span> context,<\/span> options)<\/span>;<\/span>
        \nconst<\/span> {<\/span>figure<\/span>:<\/span> figured =<\/span> title !=<\/span> null<\/span> ||<\/span> subtitle !=<\/span> null<\/span> ||<\/span> caption !=<\/span> null<\/span> ||<\/span> legends.<\/span>length ><\/span> 0<\/span>}<\/span> =<\/span> options;<\/span>
        \nif<\/span> (<\/span>figured)<\/span> {<\/span>
        \n figure =<\/span> document.<\/span>createElement<\/span>(<\/span>"figure"<\/span>)<\/span>;<\/span>
        \n figure.<\/span>className =<\/span> `<\/span>${<\/span>className}<\/span><\/span>-figure<\/span>`<\/span><\/span>;<\/span>
        \n figure.<\/span>style.<\/span>maxWidth =<\/span> "initial"<\/span>;<\/span> \/\/ avoid Observable default style（\u907f\u5f00 Observable notebook \u7684\u9ed8\u8ba4 figure \u6837\u5f0f）<\/span>
        \n if<\/span> (<\/span>title !=<\/span> null<\/span>)<\/span> figure.<\/span>append<\/span>(<\/span>createTitleElement<\/span>(<\/span>document,<\/span> title,<\/span> "h2"<\/span>)<\/span>)<\/span>;<\/span>
        \n if<\/span> (<\/span>subtitle !=<\/span> null<\/span>)<\/span> figure.<\/span>append<\/span>(<\/span>createTitleElement<\/span>(<\/span>document,<\/span> subtitle,<\/span> "h3"<\/span>)<\/span>)<\/span>;<\/span>
        \n figure.<\/span>append<\/span>(<\/span>…<\/span>legends,<\/span> svg)<\/span>;<\/span>
        \n if<\/span> (<\/span>caption !=<\/span> null<\/span>)<\/span> figure.<\/span>append<\/span>(<\/span>createFigcaption<\/span>(<\/span>document,<\/span> caption)<\/span>)<\/span>;<\/span>
        \n if<\/span> (<\/span>"value"<\/span> in<\/span> svg)<\/span> (<\/span>figure.<\/span>value =<\/span> svg.<\/span>value)<\/span>,<\/span> delete<\/span> svg.<\/span>value;<\/span>
        \n}<\/span><\/p>\n

        \u6ce8\u610f figured \u7684\u9ed8\u8ba4\u503c\u662f\u4e00\u4e2a\u8868\u8fbe\u5f0f：\u53ea\u8981\u4f60\u5199\u4e86 title\/subtitle\/caption \u6216\u4ea7\u751f\u4e86\u56fe\u4f8b，\u5c31\u81ea\u52a8\u5305 <figure>\u3002\u8fd9\u662f\u4e00\u6761\u5178\u578b\u7684"\u9690\u5f0f\u667a\u80fd"：\u7528\u6237\u4e0d\u9700\u8981\u77e5\u9053 <figure> \u8fd9\u4e2a HTML \u5143\u7d20，\u5374\u80fd\u81ea\u52a8\u83b7\u5f97\u8bed\u4e49\u5316\u7684\u7ed3\u6784\u3002\u800c if ("value" in svg) \u90a3\u4e24\u884c\u662f\u4e3a\u4e86\u652f\u6301 Observable \u7684 viewof \u6a21\u5f0f\u2014\u2014\u628a value \u5c5e\u6027\u4ece svg \u642c\u5230\u5916\u5c42 figure \u4e0a\u3002<\/p>\n

        \u6b65\u9aa4 21：\u66b4\u9732 scale\/legend \u4e0e\u63a7\u5236\u53f0\u8b66\u544a\u3002<\/p>\n

        \/\/ src\/plot.js L343-L358（\u8282\u9009）<\/span>
        \nfigure.<\/span>scale =<\/span> exposeScales<\/span>(<\/span>scales.<\/span>scales,<\/span> context)<\/span>;<\/span>
        \nfigure.<\/span>legend =<\/span> exposeLegends<\/span>(<\/span>scaleDescriptors,<\/span> context,<\/span> options)<\/span>;<\/span><\/p>\n

        const<\/span> w =<\/span> consumeWarnings<\/span>(<\/span>)<\/span>;<\/span>
        \nif<\/span> (<\/span>w ><\/span> 0<\/span>)<\/span> {<\/span>
        \n select<\/span>(<\/span>svg)<\/span>.<\/span>append<\/span>(<\/span>"text"<\/span>)<\/span>.<\/span>attr<\/span>(<\/span>"x"<\/span>,<\/span> width)<\/span>.<\/span>attr<\/span>(<\/span>"y"<\/span>,<\/span> 20<\/span>)<\/span>.<\/span>attr<\/span>(<\/span>"dy"<\/span>,<\/span> "-1em"<\/span>)<\/span>
        \n .<\/span>attr<\/span>(<\/span>"text-anchor"<\/span>,<\/span> "end"<\/span>)<\/span>
        \n .<\/span>attr<\/span>(<\/span>"font-family"<\/span>,<\/span> "initial"<\/span>)<\/span> \/\/ fix emoji rendering in Chrome（\u4fee\u590d Chrome \u4e2d\u7684 emoji \u6e32\u67d3）<\/span>
        \n .<\/span>text<\/span>(<\/span>"\\\\u26a0\\\\ufe0f"<\/span>)<\/span> \/\/ emoji variation selector（emoji \u53d8\u4f53\u9009\u62e9\u7b26，\u786e\u4fdd\u6e32\u67d3\u4e3a\u5f69\u8272\u56fe\u6807\u800c\u975e\u9ed1\u767d\u5b57\u7b26）<\/span>
        \n .<\/span>append<\/span>(<\/span>"title"<\/span>)<\/span>
        \n .<\/span>text<\/span>(<\/span>`<\/span>${<\/span>w.<\/span>toLocaleString<\/span>(<\/span>"en-US"<\/span>)<\/span>}<\/span><\/span> warning<\/span>${<\/span>w ===<\/span> 1<\/span> ?<\/span> ""<\/span> :<\/span> "s"<\/span>}<\/span><\/span>. Please check the console.<\/span>`<\/span><\/span>)<\/span>;<\/span>
        \n}<\/span><\/p>\n

        \u8b66\u544a\u7cfb\u7edf\u503c\u5f97\u5355\u72ec\u8bf4\u4e00\u53e5：Plot \u5185\u90e8\u7684 warn() \u4f1a\u628a\u6d88\u606f\u7d2f\u79ef\u5230\u4e00\u4e2a\u6a21\u5757\u7ea7\u961f\u5217\u91cc，\u6700\u540e\u53ea\u5728\u56fe\u4e0a\u753b\u4e00\u4e2a \u26a0\ufe0f \u56fe\u6807，\u771f\u6b63\u7684\u4fe1\u606f\u5728 console\u3002\u8fd9\u662f"\u4e0d\u6253\u65ad\u51fa\u56fe"\u7684\u8bbe\u8ba1\u2014\u2014\u5f88\u591a\u5e93\u4f1a\u5728\u6570\u636e\u6709\u95ee\u9898\u65f6\u76f4\u63a5\u629b\u9519\u6216\u628a\u8b66\u544a\u7cca\u5728\u56fe\u4e0a，Plot \u9009\u62e9\u4e86"\u53ef\u5ffd\u7565\u4f46\u53ef\u8ffd\u6eaf"\u3002<\/p>\n

        5.8 \u5b8c\u6574\u6d41\u7a0b\u65f6\u5e8f\u56fe<\/h6>\n

        \u4e0a\u9762\u7684 21 \u6b65\u662f"\u4ee3\u7801\u89c6\u89d2"，\u4e0b\u9762\u8fd9\u5f20\u65f6\u5e8f\u56fe\u6362\u6210"\u53c2\u4e0e\u8005\u89c6\u89d2"，\u5c55\u793a\u5404\u6a21\u5757\u4e4b\u95f4\u7684\u8c03\u7528\u5f80\u8fd4\u3002\u5efa\u8bae\u5bf9\u7167\u4e0a\u56fe\u4e00\u8d77\u770b：\u6d41\u7a0b\u56fe\u56de\u7b54"\u4e0b\u4e00\u6b65\u662f\u4ec0\u4e48"，\u65f6\u5e8f\u56fe\u56de\u7b54"\u8fd9\u4e00\u6b65\u662f\u8c01\u8c03\u7528\u8c01"\u3002<\/p>\n

        svglegends.jsmark.render(marks\/*.js)mark.scale(mark.js)createContext(context.js)scales\/index.jscreateScales(scales.js)mark.initialize(mark.js)channel.jsfacet.jsoptions.jsplot(options)(plot.js)\u7528\u6237svglegends.jsmark.render(marks\/*.js)mark.scale(mark.js)createContext(context.js)scales\/index.jscreateScales(scales.js)mark.initialize(mark.js)channel.jsfacet.jsoptions.jsplot(options)(plot.js)\u7528\u6237#mermaid-svg-Tkgirdz9lLgqTmUw{font-family:\\”trebuchet ms\\”,verdana,arial,sans-serif;font-size:16px;fill:#333;}@keyframes edge-animation-frame{from{stroke-dashoffset:0;}}@keyframes dash{to{stroke-dashoffset:0;}}#mermaid-svg-Tkgirdz9lLgqTmUw .edge-animation-slow{stroke-dasharray:9,5!important;stroke-dashoffset:900;animation:dash 50s linear infinite;stroke-linecap:round;}#mermaid-svg-Tkgirdz9lLgqTmUw .edge-animation-fast{stroke-dasharray:9,5!important;stroke-dashoffset:900;animation:dash 20s linear infinite;stroke-linecap:round;}#mermaid-svg-Tkgirdz9lLgqTmUw .error-icon{fill:#552222;}#mermaid-svg-Tkgirdz9lLgqTmUw .error-text{fill:#552222;stroke:#552222;}#mermaid-svg-Tkgirdz9lLgqTmUw .edge-thickness-normal{stroke-width:1px;}#mermaid-svg-Tkgirdz9lLgqTmUw .edge-thickness-thick{stroke-width:3.5px;}#mermaid-svg-Tkgirdz9lLgqTmUw .edge-pattern-solid{stroke-dasharray:0;}#mermaid-svg-Tkgirdz9lLgqTmUw .edge-thickness-invisible{stroke-width:0;fill:none;}#mermaid-svg-Tkgirdz9lLgqTmUw .edge-pattern-dashed{stroke-dasharray:3;}#mermaid-svg-Tkgirdz9lLgqTmUw .edge-pattern-dotted{stroke-dasharray:2;}#mermaid-svg-Tkgirdz9lLgqTmUw .marker{fill:#333333;stroke:#333333;}#mermaid-svg-Tkgirdz9lLgqTmUw .marker.cross{stroke:#333333;}#mermaid-svg-Tkgirdz9lLgqTmUw svg{font-family:\\”trebuchet ms\\”,verdana,arial,sans-serif;font-size:16px;}#mermaid-svg-Tkgirdz9lLgqTmUw p{margin:0;}#mermaid-svg-Tkgirdz9lLgqTmUw .actor{stroke:hsl(259.6261682243, 59.7765363128%, 87.9019607843%);fill:#ECECFF;}#mermaid-svg-Tkgirdz9lLgqTmUw text.actor>tspan{fill:black;stroke:none;}#mermaid-svg-Tkgirdz9lLgqTmUw .actor-line{stroke:hsl(259.6261682243, 59.7765363128%, 87.9019607843%);}#mermaid-svg-Tkgirdz9lLgqTmUw .innerArc{stroke-width:1.5;stroke-dasharray:none;}#mermaid-svg-Tkgirdz9lLgqTmUw .messageLine0{stroke-width:1.5;stroke-dasharray:none;stroke:#333;}#mermaid-svg-Tkgirdz9lLgqTmUw .messageLine1{stroke-width:1.5;stroke-dasharray:2,2;stroke:#333;}#mermaid-svg-Tkgirdz9lLgqTmUw #arrowhead path{fill:#333;stroke:#333;}#mermaid-svg-Tkgirdz9lLgqTmUw .sequenceNumber{fill:white;}#mermaid-svg-Tkgirdz9lLgqTmUw #sequencenumber{fill:#333;}#mermaid-svg-Tkgirdz9lLgqTmUw #crosshead path{fill:#333;stroke:#333;}#mermaid-svg-Tkgirdz9lLgqTmUw .messageText{fill:#333;stroke:none;}#mermaid-svg-Tkgirdz9lLgqTmUw .labelBox{stroke:hsl(259.6261682243, 59.7765363128%, 87.9019607843%);fill:#ECECFF;}#mermaid-svg-Tkgirdz9lLgqTmUw .labelText,#mermaid-svg-Tkgirdz9lLgqTmUw .labelText>tspan{fill:black;stroke:none;}#mermaid-svg-Tkgirdz9lLgqTmUw .loopText,#mermaid-svg-Tkgirdz9lLgqTmUw .loopText>tspan{fill:black;stroke:none;}#mermaid-svg-Tkgirdz9lLgqTmUw .loopLine{stroke-width:2px;stroke-dasharray:2,2;stroke:hsl(259.6261682243, 59.7765363128%, 87.9019607843%);fill:hsl(259.6261682243, 59.7765363128%, 87.9019607843%);}#mermaid-svg-Tkgirdz9lLgqTmUw .note{stroke:#aaaa33;fill:#fff5ad;}#mermaid-svg-Tkgirdz9lLgqTmUw .noteText,#mermaid-svg-Tkgirdz9lLgqTmUw .noteText>tspan{fill:black;stroke:none;}#mermaid-svg-Tkgirdz9lLgqTmUw .activation0{fill:#f4f4f4;stroke:#666;}#mermaid-svg-Tkgirdz9lLgqTmUw .activation1{fill:#f4f4f4;stroke:#666;}#mermaid-svg-Tkgirdz9lLgqTmUw .activation2{fill:#f4f4f4;stroke:#666;}#mermaid-svg-Tkgirdz9lLgqTmUw .actorPopupMenu{position:absolute;}#mermaid-svg-Tkgirdz9lLgqTmUw .actorPopupMenuPanel{position:absolute;fill:#ECECFF;box-shadow:0px 8px 16px 0px rgba(0,0,0,0.2);filter:drop-shadow(3px 5px 2px rgb(0 0 0 \/ 0.4));}#mermaid-svg-Tkgirdz9lLgqTmUw .actor-man line{stroke:hsl(259.6261682243, 59.7765363128%, 87.9019607843%);fill:#ECECFF;}#mermaid-svg-Tkgirdz9lLgqTmUw .actor-man circle,#mermaid-svg-Tkgirdz9lLgqTmUw line{stroke:hsl(259.6261682243, 59.7765363128%, 87.9019607843%);fill:#ECECFF;stroke-width:2px;}#mermaid-svg-Tkgirdz9lLgqTmUw :root{–mermaid-font-family:\\”trebuchet ms\\”,verdana,arial,sans-serif;}loop[\u6bcf\u4e2a mark]loop[\u6709 initializer \u7684 mark]loop[\u6bcf\u4e2a mark]loop[\u6bcf\u4e2a mark]plot({marks: [Dot(…)], x:{}, y:{}})1flatMarks + inferTips2maybeTopFacet + maybeMarkFacet3facetStateByMark4addScaleChannels(channelsByScale)5inferAxes (axisX\/Y\/gridX\/Y)6createFacets7facets[]8mark.initialize(facets, facetChannels, options)9dataify + range + createChannels10channels \u6570\u7ec411{data, facets, channels}12createScales(channelsByScale, options)13createScale(key, channels, opts)14scaleDescriptor15scaleDescriptors16createDimensions + autoScaleRange + createScaleFunctions17createContext(options)18context (DOM + projection + path)19mark.initializer(…)20update.{data, channels}21mark.scale(channels, scales, context)22valueObject() \u5e94\u7528 scale23values24state.values25creator("svg") + select.attr()26mark.render(index, scales, values, dimensions, context)27appendChild(circle\/rect\/…)28createLegends29legends[]30wrap figure + title\/caption31figure (\u542b .scale \/ .legend \/ .value)32<\/p>\n

        5.9 \u4e09\u5f20\u72b6\u6001\u8868<\/h6>\n

        Plot \u5728 plot() \u5185\u90e8\u7ef4\u62a4 3 \u5f20\u6838\u5fc3 Map\u3002\u7406\u89e3\u5b83\u4eec\u7684"\u5199\u5165\u65f6\u673a"\u4e0e"\u6d88\u8d39\u8005"，\u5c31\u638c\u63e1\u4e86 90% \u7684\u72b6\u6001\u6d41\u8f6c：<\/p>\n

        \/\/ src\/plot.js L43-L53（\u7cbe\u7b80）<\/span>
        \nconst<\/span> facetStateByMark =<\/span> new<\/span> Map<\/span>(<\/span>)<\/span>;<\/span> \/\/ \u2460 \u5206\u9762\u72b6\u6001<\/span>
        \n\/\/ Compute a Map from scale name to an array of associated channels.（\u8ba1\u7b97\u4e00\u4e2a\u4ece scale \u540d\u5230\u76f8\u5173\u901a\u9053\u6570\u7ec4\u7684 Map）<\/span>
        \nconst<\/span> channelsByScale =<\/span> new<\/span> Map<\/span>(<\/span>)<\/span>;<\/span> \/\/ \u2461 \u901a\u9053\u6309 scale \u5f52\u7c7b<\/span>
        \nconst<\/span> stateByMark =<\/span> new<\/span> Map<\/span>(<\/span>)<\/span>;<\/span> \/\/ \u2462 mark \u8fd0\u884c\u65f6\u72b6\u6001<\/span><\/p>\n\nMapKeyValue\u7531\u8c01\u5199（\u65f6\u673a）\u7531\u8c01\u8bfb<\/tr>\n\n\n\n\n
        facetStateByMark<\/td>\nMark<\/td>\n{channels:{fx,fy}, groups: Map, facetsIndex?}<\/td>\nmaybeMarkFacet（\u6b65\u9aa4 4\/6）；facetsIndex \u5728\u6b65\u9aa4 7 \u8865\u5199<\/td>\nfacetFilter\u3001\u6e32\u67d3\u5206\u652f<\/td>\n<\/tr>\n
        channelsByScale<\/td>\nscaleName: string<\/td>\nChannel[]<\/td>\naddScaleChannels（\u6b65\u9aa4 5 \u4e0e\u6b65\u9aa4 9 \u5404\u5199\u4e00\u6b21）<\/td>\ncreateScales\u3001inferAxes<\/td>\n<\/tr>\n
        stateByMark<\/td>\nMark<\/td>\n{data, facets, channels, values}<\/td>\nmark.initialize（\u6b65\u9aa4 8）\u5199\u524d\u4e09\u9879；mark.scale（\u6b65\u9aa4 17）\u5199 values<\/td>\nmark.render\u3001initializer\u3001getMarkState<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

        \u518d\u8865\u4e00\u5f20"\u751f\u547d\u5468\u671f"\u89c6\u56fe，\u628a\u4e09\u5f20 Map \u7684\u5199\u5165\u70b9\u8fde\u8d77\u6765：<\/p>\n

        #mermaid-svg-legdNQXhuBhjahcH{font-family:\\”trebuchet ms\\”,verdana,arial,sans-serif;font-size:16px;fill:#333;}@keyframes edge-animation-frame{from{stroke-dashoffset:0;}}@keyframes dash{to{stroke-dashoffset:0;}}#mermaid-svg-legdNQXhuBhjahcH .edge-animation-slow{stroke-dasharray:9,5!important;stroke-dashoffset:900;animation:dash 50s linear infinite;stroke-linecap:round;}#mermaid-svg-legdNQXhuBhjahcH .edge-animation-fast{stroke-dasharray:9,5!important;stroke-dashoffset:900;animation:dash 20s linear infinite;stroke-linecap:round;}#mermaid-svg-legdNQXhuBhjahcH .error-icon{fill:#552222;}#mermaid-svg-legdNQXhuBhjahcH .error-text{fill:#552222;stroke:#552222;}#mermaid-svg-legdNQXhuBhjahcH .edge-thickness-normal{stroke-width:1px;}#mermaid-svg-legdNQXhuBhjahcH .edge-thickness-thick{stroke-width:3.5px;}#mermaid-svg-legdNQXhuBhjahcH .edge-pattern-solid{stroke-dasharray:0;}#mermaid-svg-legdNQXhuBhjahcH .edge-thickness-invisible{stroke-width:0;fill:none;}#mermaid-svg-legdNQXhuBhjahcH .edge-pattern-dashed{stroke-dasharray:3;}#mermaid-svg-legdNQXhuBhjahcH .edge-pattern-dotted{stroke-dasharray:2;}#mermaid-svg-legdNQXhuBhjahcH .marker{fill:#333333;stroke:#333333;}#mermaid-svg-legdNQXhuBhjahcH .marker.cross{stroke:#333333;}#mermaid-svg-legdNQXhuBhjahcH svg{font-family:\\”trebuchet ms\\”,verdana,arial,sans-serif;font-size:16px;}#mermaid-svg-legdNQXhuBhjahcH p{margin:0;}#mermaid-svg-legdNQXhuBhjahcH .label{font-family:\\”trebuchet ms\\”,verdana,arial,sans-serif;color:#333;}#mermaid-svg-legdNQXhuBhjahcH .cluster-label text{fill:#333;}#mermaid-svg-legdNQXhuBhjahcH .cluster-label span{color:#333;}#mermaid-svg-legdNQXhuBhjahcH .cluster-label span p{background-color:transparent;}#mermaid-svg-legdNQXhuBhjahcH .label text,#mermaid-svg-legdNQXhuBhjahcH span{fill:#333;color:#333;}#mermaid-svg-legdNQXhuBhjahcH .node rect,#mermaid-svg-legdNQXhuBhjahcH .node circle,#mermaid-svg-legdNQXhuBhjahcH .node ellipse,#mermaid-svg-legdNQXhuBhjahcH .node polygon,#mermaid-svg-legdNQXhuBhjahcH .node path{fill:#ECECFF;stroke:#9370DB;stroke-width:1px;}#mermaid-svg-legdNQXhuBhjahcH .rough-node .label text,#mermaid-svg-legdNQXhuBhjahcH .node .label text,#mermaid-svg-legdNQXhuBhjahcH .image-shape .label,#mermaid-svg-legdNQXhuBhjahcH .icon-shape .label{text-anchor:middle;}#mermaid-svg-legdNQXhuBhjahcH .node .katex path{fill:#000;stroke:#000;stroke-width:1px;}#mermaid-svg-legdNQXhuBhjahcH .rough-node .label,#mermaid-svg-legdNQXhuBhjahcH .node .label,#mermaid-svg-legdNQXhuBhjahcH .image-shape .label,#mermaid-svg-legdNQXhuBhjahcH .icon-shape .label{text-align:center;}#mermaid-svg-legdNQXhuBhjahcH .node.clickable{cursor:pointer;}#mermaid-svg-legdNQXhuBhjahcH .root .anchor path{fill:#333333!important;stroke-width:0;stroke:#333333;}#mermaid-svg-legdNQXhuBhjahcH .arrowheadPath{fill:#333333;}#mermaid-svg-legdNQXhuBhjahcH .edgePath .path{stroke:#333333;stroke-width:2.0px;}#mermaid-svg-legdNQXhuBhjahcH .flowchart-link{stroke:#333333;fill:none;}#mermaid-svg-legdNQXhuBhjahcH .edgeLabel{background-color:rgba(232,232,232, 0.8);text-align:center;}#mermaid-svg-legdNQXhuBhjahcH .edgeLabel p{background-color:rgba(232,232,232, 0.8);}#mermaid-svg-legdNQXhuBhjahcH .edgeLabel rect{opacity:0.5;background-color:rgba(232,232,232, 0.8);fill:rgba(232,232,232, 0.8);}#mermaid-svg-legdNQXhuBhjahcH .labelBkg{background-color:rgba(232, 232, 232, 0.5);}#mermaid-svg-legdNQXhuBhjahcH .cluster rect{fill:#ffffde;stroke:#aaaa33;stroke-width:1px;}#mermaid-svg-legdNQXhuBhjahcH .cluster text{fill:#333;}#mermaid-svg-legdNQXhuBhjahcH .cluster span{color:#333;}#mermaid-svg-legdNQXhuBhjahcH div.mermaidTooltip{position:absolute;text-align:center;max-width:200px;padding:2px;font-family:\\”trebuchet ms\\”,verdana,arial,sans-serif;font-size:12px;background:hsl(80, 100%, 96.2745098039%);border:1px solid #aaaa33;border-radius:2px;pointer-events:none;z-index:100;}#mermaid-svg-legdNQXhuBhjahcH .flowchartTitleText{text-anchor:middle;font-size:18px;fill:#333;}#mermaid-svg-legdNQXhuBhjahcH rect.text{fill:none;stroke-width:0;}#mermaid-svg-legdNQXhuBhjahcH .icon-shape,#mermaid-svg-legdNQXhuBhjahcH .image-shape{background-color:rgba(232,232,232, 0.8);text-align:center;}#mermaid-svg-legdNQXhuBhjahcH .icon-shape p,#mermaid-svg-legdNQXhuBhjahcH .image-shape p{background-color:rgba(232,232,232, 0.8);padding:2px;}#mermaid-svg-legdNQXhuBhjahcH .icon-shape .label rect,#mermaid-svg-legdNQXhuBhjahcH .image-shape .label rect{opacity:0.5;background-color:rgba(232,232,232, 0.8);fill:rgba(232,232,232, 0.8);}#mermaid-svg-legdNQXhuBhjahcH .label-icon{display:inline-block;height:1em;overflow:visible;vertical-align:-0.125em;}#mermaid-svg-legdNQXhuBhjahcH .node .label-icon path{fill:currentColor;stroke:revert;stroke-width:revert;}#mermaid-svg-legdNQXhuBhjahcH :root{–mermaid-font-family:\\”trebuchet ms\\”,verdana,arial,sans-serif;}<\/span><\/span><\/span><\/span><\/span><\/p>\n

        \u6b65\u9aa4 4\/6facetStateByMark \u2190 maybeMarkFacet<\/p>\n

        <\/span><\/p>\n

        \u6b65\u9aa4 5\/9channelsByScale \u2190 addScaleChannels<\/p>\n

        <\/span><\/p>\n

        \u6b65\u9aa4 8stateByMark \u2190 mark.initialize<\/p>\n

        <\/span><\/p>\n

        \u6b65\u9aa4 14stateByMark.channels \u2190 initializer<\/p>\n

        <\/span><\/p>\n

        \u6b65\u9aa4 17stateByMark.values \u2190 mark.scale<\/p>\n

        <\/span><\/p>\n

        \u6b65\u9aa4 19mark.render \u53ea\u8bfb<\/p>\n

        <\/span><\/p>\n

        \u4e3a\u4ec0\u4e48 channelsByScale \u8981\u5199\u4e24\u6b21？ \u7b2c\u4e00\u6b21（\u6b65\u9aa4 5）\u5199\u5165\u7684\u662f facet \u901a\u9053（fx\/fy），\u76ee\u7684\u662f\u8ba9 createFacets \u80fd\u62ff\u5230 fx\/fy \u7684 domain；\u7b2c\u4e8c\u6b21（\u6b65\u9aa4 9）\u5199\u5165\u7684\u662f\u6240\u6709 mark \u7684\u5e38\u89c4\u901a\u9053，\u76ee\u7684\u662f\u521b\u5efa\u6700\u7ec8\u7684\u6bd4\u4f8b\u5c3a\u3002\u4e24\u6b21\u4e4b\u95f4\u9694\u7740 mark.initialize\u2014\u2014\u56e0\u4e3a\u901a\u9053\u8981\u7b49\u6570\u636e\u7269\u5316\u540e\u624d\u5b58\u5728\u3002\u8fd9\u6761"\u4e24\u6b21\u5199\u5165"\u7684\u56e0\u679c\u94fe，\u662f\u7406\u89e3 plot.js \u7ed3\u6784\u7684\u5173\u952e\u3002<\/p>\n

        5.10 \u5e38\u89c1\u8bef\u533a<\/h6>\n
      • \u300cplot() \u91cc\u6ca1\u6709\u5faa\u73af\u6e32\u67d3，\u8bf4\u660e\u5b83\u5f88\u8f7b\u300d\u2014\u2014\u6070\u6070\u76f8\u53cd\u300221 \u6b65\u91cc\u6709 3 \u4e2a for (const mark of marks) \u5faa\u73af（\u6b65\u9aa4 8\u300114\u300117\u300119 \u5404\u4e00\u6b21），\u6bcf\u6b21\u5faa\u73af\u7684\u804c\u8d23\u4e0d\u540c：\u7269\u5316 \u2192 \u4e8c\u9636\u901a\u9053 \u2192 \u7f29\u653e \u2192 \u6e32\u67d3\u3002\u628a\u5b83\u4eec\u5408\u5e76\u5728\u4e00\u4e2a\u5faa\u73af\u91cc\u4f1a\u7834\u574f"\u6240\u6709 mark \u7684 scale \u5fc5\u987b\u5148\u4e8e\u6240\u6709 mark \u7684 render"\u8fd9\u4e00\u5168\u5c40\u7ea6\u675f\u3002<\/li>\n
      • \u300cmark.render \u81ea\u5df1\u505a\u7f29\u653e\u300d\u2014\u2014\u4e0d\u662f\u3002\u6e32\u67d3\u65f6 values \u5df2\u7ecf\u662f\u50cf\u7d20\u503c，mark \u53ea\u8d1f\u8d23\u628a\u5b83\u4eec\u5199\u8fdb cx\/cy\/d \u7b49\u5c5e\u6027\u3002\u5f88\u591a\u4eba\u7b2c\u4e00\u6b21\u81ea\u5b9a\u4e49 mark \u65f6\u5728\u8fd9\u91cc\u53c8\u8c03\u4e86\u4e00\u904d scale，\u5bfc\u81f4\u53cc\u91cd\u7f29\u653e\u3002<\/li>\n
      • \u300ccreateScales \u53ea\u88ab\u8c03\u7528\u4e00\u6b21\u300d\u2014\u2014\u6b63\u5e38\u8def\u5f84\u4e00\u6b21，\u4f46\u53ea\u8981\u6709 initializer \u4ea7\u751f\u65b0 scale，\u5c31\u4f1a\u6709\u7b2c\u4e8c\u6b21（\u6b65\u9aa4 15）\u3002\u8fd9\u89e3\u91ca\u4e86\u4e00\u4e2a\u73b0\u8c61：\u67d0\u4e9b mark（\u5982 hexbin\u3001axis）\u4f1a\u8ba9\u540c\u540d\u7684 scale \u88ab\u8ba1\u7b97\u4e24\u904d，\u8c03\u8bd5\u65f6\u4e0d\u8981\u8bef\u8ba4\u4e3a\u662f bug\u3002<\/li>\n
      • \u300cfacet \u7684\u683c\u5b50\u662f\u5148\u7b97\u597d\u7684\u300d\u2014\u2014\u4e0d\u662f\u3002facets \u5148\u5efa（\u6b65\u9aa4 7）\u518d\u6309\u6700\u7ec8 domain \u91cd\u6392（\u6b65\u9aa4 16）\u3002\u5982\u679c\u4f60\u7684\u5206\u9762\u51fa\u73b0\u987a\u5e8f\u602a\u5f02\u7684\u7a7a\u767d\u683c，\u591a\u534a\u662f domain \u88ab\u663e\u5f0f\u6307\u5b9a\u6216 nice \u5706\u6574\u5f71\u54cd，\u53bb\u770b recreateFacets\u3002<\/li>\n
        5.11 \u672c\u7ae0\u5c0f\u7ed3<\/h6>\n
          \n
        • plot() \u662f\u5168\u5e93\u552f\u4e00\u7f16\u6392\u5668，21 \u6b65\u30015 \u4e2a\u9636\u6bb5：\u6574\u7406\u58f0\u660e \u2192 \u521d\u59cb\u5316\u4e0e\u6bd4\u4f8b\u5c3a \u2192 \u73af\u5883\u4e0e\u4e8c\u9636\u901a\u9053 \u2192 \u7f29\u653e\u4e0e\u6e32\u67d3 \u2192 \u5305\u88c5\u4e0e\u8f93\u51fa\u3002<\/li>\n
        • \u9636\u6bb5\u987a\u5e8f\u4e0d\u80fd\u4ea4\u6362\u7684\u6839\u672c\u539f\u56e0\u6709\u4e24\u6761：domain \u4f9d\u8d56\u6570\u636e（\u6240\u4ee5\u8981\u7b49 initialize）\u3001range \u4f9d\u8d56\u5c3a\u5bf8（\u6240\u4ee5\u8981\u7b49 dimensions）；\u800c\u526f\u4f5c\u7528（initializer \u65b0\u589e scale）\u5fc5\u987b\u9760"\u6309\u9700\u91cd\u7b97"\u8865\u9f50\u3002<\/li>\n
        • \u4e09\u5f20 Map \u662f\u72b6\u6001\u6d41\u8f6c\u7684\u6838\u5fc3：facetStateByMark（\u5206\u9762）\u3001channelsByScale（\u4e24\u6b21\u5199\u5165）\u3001stateByMark（\u4e24\u9636\u6bb5\u5199\u5165\u3001\u4e00\u5904\u8bfb\u53d6）\u3002<\/li>\n
        • \u9690\u5f0f\u884c\u4e3a\u90fd\u5728\u8fd9\u4e2a\u51fd\u6570\u91cc\u53d1\u751f：\u9690\u5f0f tip（\u6b65\u9aa4 2）\u3001\u9690\u5f0f\u5750\u6807\u8f74（\u6b65\u9aa4 6）\u3001\u81ea\u52a8 <figure> \u5305\u88c5（\u6b65\u9aa4 20）\u3001\u8b66\u544a\u56fe\u6807（\u6b65\u9aa4 21）\u3002"\u96f6\u914d\u7f6e"\u4e0d\u662f\u9b54\u6cd5，\u800c\u662f\u8fd9\u56db\u6bb5\u4ee3\u7801\u3002<\/li>\n<\/ul>\n

          \u4e0b\u4e00\u7ae0\u805a\u7126\u7b2c 9\u201312 \u6b65\u91cc\u6700"\u806a\u660e"\u7684\u4e00\u6bb5：\u5f53\u7528\u6237\u5b8c\u5168\u4e0d\u5199 scale \u65f6，Plot \u5982\u4f55\u51b3\u5b9a\u7528 linear \u8fd8\u662f band\u3001domain \u4e0e range \u53c8\u4ece\u54ea\u91cc\u6765\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

          \u7b2c 5 \u7ae0 plot() \u4e3b\u6d41\u7a0b\u5168\u666f\u7b2c 3 \u7ae0\u7ed9\u51fa\u4e86\u6a21\u5757\u5730\u56fe，\u7b2c 4 \u7ae0\u62c6\u5f00\u4e86\u516d\u4e2a\u6838\u5fc3\u62bd\u8c61\u3002\u4f46\u5730\u56fe\u4e0e\u96f6\u4ef6\u90fd\u8fd8\u4e0d\u7b49\u4e8e\\”\u673a\u5668\u600e\u4e48\u8f6c\\”\u3002\u672c\u7ae0\u56de\u5230\u552f\u4e00\u7684\u7f16\u6392\u5668 src\/plot.js，\u628a plot(options) \u8fd9 340 \u884c\u4ee3\u7801\u62c6\u6210 21 \u4e2a\u53ef\u9a8c\u8bc1\u7684\u6b65\u9aa4\u30015 \u4e2a\u8bed\u4e49\u9636\u6bb5\u3002
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