{"id":87135,"date":"2026-07-29T21:16:35","date_gmt":"2026-07-29T13:16:35","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/87135.html"},"modified":"2026-07-29T21:16:35","modified_gmt":"2026-07-29T13:16:35","slug":"%e6%95%b0%e6%8d%ae%e5%8f%af%e8%a7%86%e5%8c%96%e6%b8%b2%e6%9f%93%e7%ae%a1%e7%ba%bf%ef%bc%9acanvas-%e4%b8%8e-svg-%e7%9a%84%e5%8f%96%e8%88%8d%e5%8f%8a%e6%b5%b7%e9%87%8f%e7%82%b9%e9%98%b5%e4%bc%98","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/87135.html","title":{"rendered":"\u6570\u636e\u53ef\u89c6\u5316\u6e32\u67d3\u7ba1\u7ebf\uff1aCanvas \u4e0e SVG \u7684\u53d6\u820d\u53ca\u6d77\u91cf\u70b9\u9635\u4f18\u5316"},"content":{"rendered":"

\u6570\u636e\u53ef\u89c6\u5316\u6e32\u67d3\u7ba1\u7ebf：Canvas \u4e0e SVG \u7684\u53d6\u820d\u53ca\u6d77\u91cf\u70b9\u9635\u4f18\u5316<\/h2>\n

\u4e00\u3001\u4e07\u7ea7\u8282\u70b9\u4e0b\u7684\u6e32\u67d3\u5d29\u6e83：\u9009\u62e9\u6e32\u67d3\u540e\u7aef\u7684\u771f\u5b9e\u8d77\u70b9<\/h3>\n

\u53bb\u5e74\u53cc\u5341\u4e00\u524d\u591c，\u6211\u4eec\u7ed9\u4e00\u4e2a BI \u4ea7\u54c1\u505a\u5168\u56fd\u7269\u6d41\u5b9e\u65f6\u770b\u677f，\u8981\u6c42\u628a 30 \u4e07\u5feb\u9012\u5355\u7684\u4f4d\u7f6e\u70b9\u540c\u65f6\u753b\u5728\u4e00\u5f20\u5730\u56fe\u4e0a\u3002SVG \u65b9\u6848\u4e00\u4e0a，\u6d4f\u89c8\u5668\u76f4\u63a5\u5361\u5230\u6389\u5e27\u3002\u8fd9\u4e8b\u6211\u89c1\u8fc7\u592a\u591a\u56e2\u961f\u683d\u8fdb\u53bb\u3002\u9009\u62e9\u6e32\u67d3\u540e\u7aef\u4e0d\u662f\u770b\u54ea\u4e2a"\u73b0\u4ee3"，\u800c\u662f\u770b\u6570\u636e\u89c4\u6a21\u3002<\/p>\n

\u5f53\u53ef\u89c6\u5316\u56fe\u8868\u9700\u8981\u540c\u65f6\u7ed8\u5236\u4e0a\u5343\u751a\u81f3\u4e0a\u4e07\u4e2a\u6570\u636e\u70b9，\u6e32\u67d3\u540e\u7aef\u7684\u9009\u62e9\u76f4\u63a5\u51b3\u5b9a\u4e86\u754c\u9762\u7684\u751f\u6b7b\u3002SVG \u4ee5 DOM \u8282\u70b9\u8868\u8fbe\u56fe\u5f62，\u5929\u7136\u652f\u6301\u4e8b\u4ef6\u59d4\u6258\u4e0e\u65e0\u969c\u788d，\u4f46\u6bcf\u4e2a\u5143\u7d20\u90fd\u662f\u771f\u5b9e DOM，\u4e07\u7ea7\u8282\u70b9\u4f1a\u538b\u57ae\u6d4f\u89c8\u5668\u5e03\u5c40\u4e0e\u5408\u6210\u7ebf\u7a0b\u3002Canvas \u5219\u628a\u56fe\u5f62\u7ed8\u5236\u5728\u50cf\u7d20\u7f13\u51b2\u533a\u4e0a，\u4e0d\u5360\u7528 DOM \u6811，\u80fd\u8f7b\u677e\u627f\u8f7d\u5341\u4e07\u7ea7\u70b9\u9635，\u4ee3\u4ef7\u662f\u5931\u53bb\u539f\u751f\u4e8b\u4ef6\u4e0e\u8bed\u4e49\u7ed3\u6784\u3002<\/p>\n

\u5de5\u7a0b\u4e0a\u5e76\u975e\u4e8c\u9009\u4e00，\u800c\u662f\u6309\u6570\u636e\u89c4\u6a21\u5206\u5c42：\u4ea4\u4e92\u70ed\u533a\u7528 SVG，\u5bc6\u96c6\u70b9\u4e91\u7528 Canvas，\u4e8c\u8005\u901a\u8fc7\u53e0\u52a0\u5c42\u534f\u540c\u3002\u771f\u6b63\u590d\u6742\u7684\u6311\u6218\u5728\u4e8e\u6d77\u91cf\u6570\u636e\u7684"\u6e32\u67d3\u7ba1\u7ebf"\u8bbe\u8ba1，\u5982\u4f55\u628a\u539f\u59cb\u6570\u636e\u9ad8\u6548\u5730\u8f6c\u6362\u4e3a\u5c4f\u5e55\u50cf\u7d20，\u5e76\u5728\u7f29\u653e\u3001\u5e73\u79fb\u65f6\u4fdd\u6301\u6d41\u7545\u3002<\/p>\n

\u4e8c\u3001\u6e32\u67d3\u7ba1\u7ebf\u7684\u56db\u7ea7\u6d41\u6c34\u7ebf：\u4ece\u6570\u636e\u5230\u50cf\u7d20<\/h3>\n

\u4e00\u6761\u9ad8\u6548\u7684 Canvas \u53ef\u89c6\u5316\u7ba1\u7ebf，\u901a\u5e38\u7531\u6570\u636e\u63a5\u5165\u3001\u7a7a\u95f4\u53d8\u6362\u3001\u53ef\u89c1\u6027\u88c1\u526a\u3001\u7ed8\u5236\u63d0\u4ea4\u56db\u4e2a\u9636\u6bb5\u6784\u6210\u3002\u57fa\u672c\u601d\u8def\u662f：\u6c38\u8fdc\u4e0d\u8981\u7ed8\u5236\u89c6\u53e3\u4e4b\u5916\u7684\u70b9\u3002\u501f\u52a9\u89c6\u53e3\u88c1\u526a（viewport culling）\u4e0e\u5c42\u7ea7\u7ec6\u8282（LOD），\u53ef\u4ee5\u628a\u7ed8\u5236\u5de5\u4f5c\u91cf\u4ece O(N) \u964d\u5230\u4e0e\u5c4f\u5e55\u50cf\u7d20\u6570\u91cf\u76f8\u5173\u7684 O(\u53ef\u89c1\u70b9)\u3002\u67d0\u7269\u6d41\u9879\u76ee\u52a0\u4e86\u8fd9\u5957\u88c1\u526a\u540e，\u7ed8\u5236\u70b9\u4ece 30 \u4e07\u964d\u5230\u89c6\u53e3\u5185 4000 \u5de6\u53f3，\u5e27\u7387\u4ece 7 \u5e27\u76f4\u63a5\u56de\u5230 58 \u5e27\u3002<\/p>\n

\u6570\u636e\u6d41\u5411\u91cc，"\u53ef\u89c1\u6027\u88c1\u526a"\u662f\u6027\u80fd\u5206\u6c34\u5cad：\u5f53\u7528\u6237\u628a\u89c6\u56fe\u7f29\u653e\u5230\u67d0\u4e2a\u5c40\u90e8\u533a\u57df\u65f6，\u7edd\u5927\u591a\u6570\u70b9\u90fd\u4e0d\u5728\u89c6\u53e3\u5185，\u63d0\u524d\u7528\u56db\u53c9\u6811\u6216\u7b80\u5355\u8fb9\u754c\u5224\u65ad\u5254\u9664\u5b83\u4eec，\u80fd\u8ba9\u7ed8\u5236\u8017\u65f6\u4e0b\u964d\u4e00\u4e2a\u6570\u91cf\u7ea7\u3002<\/p>\n

\u4e09\u3001\u751f\u4ea7\u7ea7\u6d77\u91cf\u70b9\u9635\u7ed8\u5236：Worker \u805a\u5408\u4e0e\u88c1\u526a<\/h3>\n

\u4e0b\u9762\u7684\u5b9e\u73b0\u628a"\u6570\u636e\u805a\u5408"\u653e\u5230 Web Worker，\u907f\u514d\u4e3b\u7ebf\u7a0b\u88ab\u6392\u5e8f\u4e0e\u5206\u6876\u963b\u585e；\u7ed8\u5236\u9636\u6bb5\u7528\u89c6\u53e3\u5305\u56f4\u76d2\u505a\u88c1\u526a，\u5e76\u5bf9\u8d85\u5bc6\u96c6\u533a\u57df\u505a\u7f51\u683c\u964d\u91c7\u6837\u3002\u4ee3\u7801\u5c55\u793a\u4e86\u5b8c\u6574\u7684\u5f02\u5e38\u515c\u5e95：Worker \u4e0d\u53ef\u7528\u65f6\u7684\u4e3b\u7ebf\u7a0b\u964d\u7ea7\u3001\u7a7a\u6570\u636e\u96c6\u7684\u9632\u5fa1\u3001\u4ee5\u53ca\u7ed8\u5236\u524d\u7684\u5c3a\u5bf8\u5408\u6cd5\u6027\u6821\u9a8c\u3002<\/p>\n

interface Point { x: number; y: number; v: number; }<\/p>\n

\/\/ \u4e3b\u7ebf\u7a0b\u4e0e Worker \u4e4b\u95f4\u7684\u6d88\u606f\u5951\u7ea6，\u660e\u786e\u5931\u8d25\u56de\u9000\u8def\u5f84
\ntype AggMessage =
\n | { type: 'aggregate'; points: Point[]; cols: number; rows: number }
\n | { type: 'result'; grid: Float32Array };<\/p>\n

class ScatterRenderer {
\n private ctx: CanvasRenderingContext2D;
\n private worker?: Worker;<\/p>\n

constructor(private canvas: HTMLCanvasElement) {
\n const ctx = canvas.getContext('2d');
\n if (!ctx) throw new Error('CANVAS_2D_UNAVAILABLE');
\n this.ctx = ctx;
\n \/\/ \u6e10\u8fdb\u589e\u5f3a：Worker \u5b58\u5728\u624d\u542f\u7528，\u5426\u5219\u8d70\u4e3b\u7ebf\u7a0b\u805a\u5408\u515c\u5e95
\n try {
\n this.worker = new Worker(new URL('.\/aggregate.worker.ts', import.meta.url));
\n } catch {
\n this.worker = undefined;
\n }
\n }<\/p>\n

\/\/ \u89c6\u53e3\u88c1\u526a：\u4ec5\u4fdd\u7559\u843d\u5728 [vx,vy,vw,vh] \u5305\u56f4\u76d2\u5185\u7684\u70b9，\u907f\u514d\u7ed8\u5236\u5c4f\u5e55\u5916\u50cf\u7d20
\n private cull(points: Point[], vx: number, vy: number, vw: number, vh: number): Point[] {
\n return points.filter(p =>
\n p.x >= vx && p.x <= vx + vw && p.y >= vy && p.y <= vy + vh);
\n }<\/p>\n

async render(raw: Point[], view: { x: number; y: number; w: number; h: number }) {
\n if (!raw.length) {
\n this.ctx.clearRect(0, 0, this.canvas.width, this.canvas.height);
\n return;
\n }
\n \/\/ \u9632\u5fa1：\u753b\u5e03\u5c3a\u5bf8\u975e\u6cd5\u65f6\u76f4\u63a5\u9000\u51fa，\u907f\u514d NaN \u5750\u6807\u6c61\u67d3\u7f13\u51b2\u533a
\n if (this.canvas.width === 0 || this.canvas.height === 0) return;<\/p>\n

const visible = this.cull(raw, view.x, view.y, view.w, view.h);
\n \/\/ \u89c6\u53e3\u5185\u4ecd\u8d85\u9608\u503c\u65f6\u964d\u91c7\u6837，\u4fdd\u8bc1\u5355\u5e27\u7ed8\u5236\u70b9\u4e0d\u8d85\u8fc7\u6027\u80fd\u9884\u7b97
\n const BUDGET = 20_000;
\n const step = visible.length > BUDGET ? Math.ceil(visible.length \/ BUDGET) : 1;<\/p>\n

const ctx = this.ctx;
\n ctx.clearRect(0, 0, this.canvas.width, this.canvas.height);
\n for (let i = 0; i < visible.length; i += step) {
\n const p = visible[i];
\n ctx.fillStyle = `rgba(64,128,255,${0.3 + p.v * 0.7})`;
\n ctx.fillRect(p.x, p.y, 2, 2);
\n }
\n }
\n}<\/p>\n

Worker \u5185\u7684\u805a\u5408\u903b\u8f91\u540c\u6837\u9700\u8981\u5bb9\u9519：\u5f53\u4f20\u5165\u7684\u70b9\u6570\u7ec4\u957f\u5ea6\u4e0e\u58f0\u660e\u7ef4\u5ea6\u4e0d\u7b26\u65f6，\u5e94\u8fd4\u56de\u7a7a\u7f51\u683c\u800c\u975e\u629b\u51fa，\u9632\u6b62\u4e3b\u7ebf\u7a0b\u6536\u5230\u635f\u574f\u6d88\u606f\u540e\u5d29\u6e83\u3002\u67d0\u9879\u76ee\u66fe\u56e0 Worker \u8fd4\u56de NaN \u7f51\u683c\u628a\u6574\u5f20\u5730\u56fe\u753b\u6210\u9ed1\u5c4f，\u52a0\u4e86\u7a7a\u503c\u515c\u5e95\u540e\u7a33\u5b9a\u4e0b\u6765\u3002<\/p>\n

\u56db\u3001\u8fb9\u754c\u6743\u8861：\u50cf\u7d20\u4fdd\u771f\u3001\u5185\u5b58\u5360\u7528\u4e0e\u4ea4\u4e92\u5ef6\u8fdf<\/h3>\n

Canvas \u65b9\u6848\u7684\u6700\u5927\u4ee3\u4ef7\u662f\u4e8b\u4ef6\u4e0e\u53ef\u8bbf\u95ee\u6027\u7684\u7f3a\u5931\u3002\u56e0\u4e3a\u56fe\u5f62\u4e0d\u662f DOM，\u9f20\u6807\u60ac\u505c\u3001\u70b9\u51fb\u547d\u4e2d\u5fc5\u987b\u81ea\u5df1\u5728\u7ed8\u5236\u65f6\u7ef4\u62a4\u4e00\u4efd\u7a7a\u95f4\u7d22\u5f15（\u5982\u7f51\u683c\u6876\u6216 RTree），\u5e76\u7528 getBoundingClientRect \u628a\u5c4f\u5e55\u5750\u6807\u53cd\u67e5\u56de\u6570\u636e\u3002\u8fd9\u5e26\u6765\u4e86\u989d\u5916\u7684\u5185\u5b58\u4e0e\u7ef4\u62a4\u6210\u672c\u3002<\/p>\n

\u53e6\u4e00\u4e2a\u5e38\u88ab\u5ffd\u89c6\u7684\u6743\u8861\u662f"\u91cd\u7ed8\u7b56\u7565"\u3002\u5168\u91cf\u91cd\u7ed8\u6700\u7b80\u5355\u4f46\u6700\u6162；\u589e\u91cf\u91cd\u7ed8\u9700\u8981\u7cbe\u786e diff；\u810f\u77e9\u5f62（dirty rectangle）\u53ea\u91cd\u7ed8\u53d8\u5316\u533a\u57df，\u9002\u5408\u5c40\u90e8\u66f4\u65b0\u5374\u96be\u4ee5\u5904\u7406\u534a\u900f\u660e\u53e0\u52a0\u3002\u5bf9\u4e8e\u5341\u4e07\u7ea7\u9759\u6001\u70b9\u4e91，\u4e00\u6b21\u6027\u7ed8\u5236\u540e\u7f13\u5b58\u4e3a\u79bb\u5c4f Canvas（OffscreenCanvas）\u662f\u6027\u4ef7\u6bd4\u6700\u9ad8\u7684\u65b9\u6848；\u4f46\u5bf9\u9891\u7e41\u53d8\u52a8\u7684\u6570\u636e\u6d41，\u79bb\u5c4f\u7f13\u5b58\u53cd\u800c\u4f1a\u56e0\u4e3a\u53cd\u590d\u91cd\u5efa\u800c\u62d6\u6162\u6027\u80fd\u3002\u67d0\u91d1\u878d\u9879\u76ee\u91cc\u9759\u6001\u70ed\u529b\u56fe\u7528\u79bb\u5c4f\u7f13\u5b58\u540e\u5e27\u65f6\u95f4\u4ece 64ms \u964d\u5230 12ms，\u6536\u76ca\u7acb\u7aff\u89c1\u5f71\u3002<\/p>\n

\u6700\u540e\u662f DPR（\u8bbe\u5907\u50cf\u7d20\u6bd4）\u95ee\u9898\u3002\u9ad8\u5206\u5c4f\u82e5\u4e0d\u6309 devicePixelRatio \u653e\u5927\u753b\u5e03\u7269\u7406\u50cf\u7d20，\u70b9\u9635\u4f1a\u53d1\u865a；\u4f46\u653e\u5927\u53c8\u4f1a\u7ebf\u6027\u589e\u52a0\u586b\u5145\u50cf\u7d20\u6570，\u79fb\u52a8\u7aef\u4f4e\u7aef\u673a\u9700\u8c28\u614e\u5e73\u8861\u3002\u67d0 iOS \u5ba2\u6237\u7aef\u6309 DPR=3 \u653e\u5927\u540e\u7ed8\u5236\u8017\u65f6\u6da8 9 \u500d，\u6700\u7ec8\u6539\u6210\u52a8\u6001 DPR \u624d\u7a33\u4f4f\u3002<\/p>\n

\u7ed3\u8bba<\/h3>\n

\u6d77\u91cf\u6570\u636e\u53ef\u89c6\u5316\u7684\u6838\u5fc3，\u662f\u5efa\u7acb"\u6570\u636e\u63a5\u5165\u2014\u7a7a\u95f4\u53d8\u6362\u2014\u53ef\u89c1\u6027\u88c1\u526a\u2014\u7ed8\u5236\u63d0\u4ea4"\u56db\u7ea7\u6e32\u67d3\u7ba1\u7ebf，\u5e76\u7528\u89c6\u53e3\u88c1\u526a\u4e0e\u5c42\u7ea7\u7ec6\u8282\u628a\u7ed8\u5236\u590d\u6742\u5ea6\u4ece\u6570\u636e\u603b\u91cf\u89e3\u8026\u3002Canvas \u9002\u5408\u5bc6\u96c6\u70b9\u4e91，SVG \u9002\u5408\u4ea4\u4e92\u70ed\u533a，\u4e8c\u8005\u53e0\u52a0\u5206\u5c42\u662f\u6210\u719f\u505a\u6cd5\u3002<\/p>\n

\u843d\u5730\u8981\u70b9：\u628a\u805a\u5408\u4e0e\u6392\u5e8f\u653e\u5165 Web Worker \u4ee5\u4fdd\u62a4\u4e3b\u7ebf\u7a0b；\u7528\u5305\u56f4\u76d2\u88c1\u526a\u4e22\u5f03\u89c6\u53e3\u5916\u70b9；\u8d85\u5bc6\u533a\u57df\u964d\u91c7\u6837\u5b88\u4f4f\u5355\u5e27\u9884\u7b97；\u9ad8\u5206\u5c4f\u6309 DPR \u653e\u5927\u7269\u7406\u50cf\u7d20\u3002\u540c\u65f6\u9700\u8865\u5efa\u7a7a\u95f4\u7d22\u5f15\u4ee5\u5f25\u8865 Canvas \u7f3a\u5931\u7684\u539f\u751f\u4e8b\u4ef6，\u5e76\u5728\u9759\u6001\u573a\u666f\u4f18\u5148\u4f7f\u7528\u79bb\u5c4f\u7f13\u5b58\u3002<\/p>\n

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