{"id":108086,"date":"2026-09-20T23:16:47","date_gmt":"2026-09-20T15:16:47","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/108086.html"},"modified":"2026-09-20T23:16:47","modified_gmt":"2026-09-20T15:16:47","slug":"%e8%a7%86%e5%9b%be%e9%80%82%e9%85%8d%e9%9d%a9%e5%91%bd%ef%bc%9a%e7%b2%be%e5%87%86%e5%a1%ab%e5%85%85%e4%b8%8e%e6%a1%86%e9%80%89%e7%bc%a9%e6%94%be","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/108086.html","title":{"rendered":"\u89c6\u56fe\u9002\u914d\u9769\u547d\uff1a\u7cbe\u51c6\u586b\u5145\u4e0e\u6846\u9009\u7f29\u653e"},"content":{"rendered":"

\u89c6\u56fe\u547d\u4ee4\u6539\u9020：\u9002\u914d\u7a97\u53e3（Fit）\u4e0e\u7a97\u53e3\u7f29\u653e（Zoom Box）\u2014\u2014\u8bbe\u8ba1\u4e0e\u5206\u6790<\/h2>\n

\u6a21\u5757：src\/ui\/GraphicsView.{h,cpp}\u3001src\/ui\/MainWindow.cpp\u3001src\/ui\/icons.h
\n\u6d4b\u8bd5：tests\/view_fit_zoom_test.cpp（\u65b0\u589e target ViewFitZoomTest）
\n\u5173\u8054\u6587\u6863：pan_root_cause_fix.md\u3001\u9009\u62e9\u529f\u80fd\u5b8c\u5584-\u5b9e\u73b0\u8bf4\u660e.md<\/p>\n

\n

0. \u6458\u8981<\/h3>\n

\u672c\u6b21\u6539\u9020\u89e3\u51b3\u201c\u89c6\u56fe\u83dc\u5355\u4e2d\u7f3a\u5c11\u771f\u6b63\u7684\u5185\u5bb9\u9002\u914d，\u4e14\u6ca1\u6709\u6846\u9009\u7f29\u653e\u201d\u7684\u95ee\u9898，\u5171\u4e24\u6761\u4e3b\u7ebf：<\/p>\n\n\u547d\u4ee4\u6539\u9020\u524d\u6539\u9020\u540e<\/tr>\n\n\n\n
\u9002\u914d\u7a97\u53e3（Ctrl+0）<\/td>\nzoom=4 + \u89c6\u53e3\u4e2d\u5fc3\u4e3a\u539f\u70b9，\u5b8c\u5168\u6ca1\u6709\u9002\u914d\u5185\u5bb9<\/td>\n\u53d6\u6240\u6709\u53ef\u89c1\u56fe\u5143\u7684\u51e0\u4f55\u5305\u56f4\u76d2，\u7b49\u6bd4\u7f29\u653e\u5e76\u5c45\u4e2d，\u7cbe\u786e\u5145\u6ee1\u7ed8\u56fe\u5de5\u4f5c\u533a<\/td>\n<\/tr>\n
\u7a97\u53e3\u7f29\u653e（Ctrl+9）<\/td>\n\u4e0d\u5b58\u5728<\/td>\n\u8fdb\u5165\u6846\u9009\u6a21\u5f0f \u2192 \u62d6\u6846 \u2192 \u8be5\u533a\u57df\u7cbe\u786e\u5145\u6ee1\u7ed8\u56fe\u5de5\u4f5c\u533a，\u5b8c\u6210\u540e\u81ea\u52a8\u9000\u51fa<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u4e24\u6761\u547d\u4ee4\u5171\u540c\u7684\u6838\u5fc3\u7ea6\u675f：\u5750\u6807\u8f74\u4e0e\u7a0b\u5e8f\u63d0\u793a\u6587\u5b57\u4fdd\u6301\u539f\u6709\u663e\u793a\u4e0d\u53d8（\u4e0d\u968f\u5185\u5bb9\u7f29\u653e）\u3002<\/p>\n

\u6700\u7ec8\u7ed3\u8bba\u4e00\u53e5\u8bdd：fitView() \u4ece\u201c\u8bbe\u6b7b\u7f29\u653e\u6bd4\u4f8b\u201d\u6539\u4e3a\u201c\u6309\u5185\u5bb9\u5305\u56f4\u76d2\u9002\u914d\u201d；fitWorldRect() \u662f\u4e8c\u8005\u5171\u7528\u7684\u9002\u914d\u5185\u6838；\u5750\u6807\u8f74\/\u63d0\u793a\u6587\u5b57\u56e0\u5904\u4e8e\u88c5\u9970\u6027\u8986\u76d6\u5c42（\u4e0d\u5728 model_->elements() \u4e2d）\u800c\u5929\u7136\u514d\u75ab，\u65e0\u9700\u4efb\u4f55\u7279\u6b8a\u5904\u7406\u3002<\/p>\n

\n

1. \u9700\u6c42\u89e3\u6790<\/h3>\n

1.1 \u539f\u59cb\u9700\u6c42<\/h4>\n
  • \u89c6\u56fe\u83dc\u5355\u3010\u9002\u5408\u7a97\u53e3\u3011（\u5373\u73b0\u6709\u3010\u9002\u914d\u7a97\u53e3\u3011）\u88ab\u70b9\u51fb\u540e，\u7ed8\u5236\u7684\u56fe\u5f62（\u4e0d\u542b\u5750\u6807\u8f74\u4e0e\u7a0b\u5e8f\u63d0\u793a\u6587\u5b57）\u5e94\u7cbe\u786e\u7f29\u653e\u5e76\u5145\u6ee1\u6574\u4e2a\u7ed8\u56fe\u5de5\u4f5c\u533a\u57df；\u5750\u6807\u8f74\u4e0e\u63d0\u793a\u6587\u5b57\u4fdd\u6301\u539f\u6709\u663e\u793a\u4e0d\u53d8\u3002<\/li>\n
  • \u65b0\u589e\u3010\u7a97\u53e3\u7f29\u653e\u3011：\u70b9\u51fb\u540e\u8fdb\u5165\u6846\u9009\u6a21\u5f0f，\u7528\u6237\u62d6\u52a8\u9f20\u6807\u6846\u9009\u76ee\u6807\u533a\u57df，\u6846\u9009\u5b8c\u6210\u540e\u8be5\u533a\u57df\u7f29\u653e\u5e76\u5145\u6ee1\u6574\u4e2a\u7ed8\u56fe\u5de5\u4f5c\u533a\u57df\u3002<\/li>\n

    1.2 \u62c6\u89e3\u4e3a\u53ef\u9a8c\u8bc1\u7684\u9a8c\u6536\u6807\u51c6<\/h4>\n\n\u7f16\u53f7\u9a8c\u6536\u6807\u51c6\u9a8c\u8bc1\u65b9\u5f0f<\/tr>\n\n\n\n\n\n\n\n
    A1<\/td>\n\u9002\u914d\u540e，\u5185\u5bb9（\u56fe\u5f62）\u5728\u89c6\u53e3\u4e2d\u201c\u5145\u6ee1\u201d\u53d7\u9650\u7ef4\u5ea6\u3001\u53e6\u4e00\u7ef4\u5c45\u4e2d<\/td>\n\u65ad\u8a00\u5185\u5bb9\u5c4f\u5e55\u77e9\u5f62 == \u89c6\u53e3\u5728\u53d7\u9650\u7ef4\u4e0a\u6ee1\u5360\u3001\u53e6\u4e00\u7ef4\u5c45\u4e2d<\/td>\n<\/tr>\n
    A2<\/td>\n\u9002\u914d\u8303\u56f4\u4e0d\u5305\u542b\u5750\u6807\u8f74\u4e0e\u63d0\u793a\u6587\u5b57<\/td>\n\u5750\u6807\u8f74\/HUD \u4e3a\u5c4f\u5e55\u5e38\u91cf，\u4e0d\u53c2\u4e0e\u5305\u56f4\u76d2\u8ba1\u7b97<\/td>\n<\/tr>\n
    A3<\/td>\n\u9002\u914d\u540e，\u5750\u6807\u8f74\u4e0e\u63d0\u793a\u6587\u5b57\u7684\u4f4d\u7f6e\/\u5c3a\u5bf8\u4e0d\u53d8<\/td>\n\u4e8c\u8005\u4ee5 resetTransform \u540e\u6309\u50cf\u7d20\u5750\u6807\u7ed8\u5236<\/td>\n<\/tr>\n
    B1<\/td>\n\u5b58\u5728\u201c\u7a97\u53e3\u7f29\u653e\u201d\u83dc\u5355\u9879，\u70b9\u51fb\u540e\u8fdb\u5165\u6846\u9009\u6a21\u5f0f<\/td>\n\u83dc\u5355\/\u5de5\u5177\u680f\u5b58\u5728\u52a8\u4f5c；zoomBoxMode()==true<\/td>\n<\/tr>\n
    B2<\/td>\n\u62d6\u6846\u5b8c\u6210\u540e，\u6846\u9009\u533a\u57df\u5e94\u7cbe\u786e\u5145\u6ee1\u5de5\u4f5c\u533a<\/td>\n\u65ad\u8a00 zoom == min(vw\/w, vh\/h)，\u4e14\u6846\u4e2d\u5fc3\u6620\u5c04\u5230\u89c6\u53e3\u4e2d\u5fc3<\/td>\n<\/tr>\n
    B3<\/td>\n\u5b8c\u6210\u540e\u81ea\u52a8\u9000\u51fa\u6846\u9009\u6a21\u5f0f<\/td>\nzoomBoxMode()==false<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
    \n

    2. \u73b0\u72b6\u8c03\u7814（\u4ee3\u7801\u63a2\u7d22\u8fc7\u7a0b）<\/h3>\n

    2.1 \u76f8\u5173\u6587\u4ef6\u5730\u56fe<\/h4>\n

    \u5148\u7528\u641c\u7d22\u786e\u5b9a\u6d89\u53ca\u7684\u6e90\u6587\u4ef6，\u5f97\u5230\u5982\u4e0b\u5173\u952e\u8def\u5f84：<\/p>\n

    src\/ui\/GraphicsView.{h,cpp} \u2190 \u53d8\u6362\u3001\u7ed8\u5236\u3001\u9f20\u6807\u4e8b\u4ef6\u3001\u6846\u9009（marquee）
    \nsrc\/ui\/MainWindow.cpp \u2190 \u89c6\u56fe\u83dc\u5355 \/ \u5de5\u5177\u680f\u63a5\u7ebf
    \nsrc\/ui\/icons.h \u2190 \u77e2\u91cf\u56fe\u6807\u5de5\u5382 icons::make(id)
    \ntests\/view_render_test.cpp \u2190 \u4f9d\u8d56 fitView()（\u56de\u5f52\u5173\u6ce8）
    \ntests\/view_render_test2.cpp \u2190 \u4f9d\u8d56 fitView()（\u56de\u5f52\u5173\u6ce8）
    \ntests\/select_window_test.cpp \u2190 \u4f9d\u8d56 fitView()（\u56de\u5f52\u5173\u6ce8）<\/p>\n

    2.2 GraphicsView \u7684\u5750\u6807 \/ \u53d8\u6362\u673a\u5236<\/h4>\n

    GraphicsView \u662f\u81ea\u5b9a\u4e49 QGraphicsView，\u7f29\u653e \/ \u5e73\u79fb\u4e0d\u76f4\u63a5\u64cd\u4f5c QTransform，，\u800c\u662f\u7ef4\u62a4\u4e09\u4e2a\u6210\u5458：<\/p>\n

      \n
    • zoom_：\u5f53\u524d\u7f29\u653e\u6bd4\u4f8b；<\/li>\n
    • panX_ \/ panY_：\u4e16\u754c\u539f\u70b9\u5728\u89c6\u53e3\u4e2d\u7684\u5c4f\u5e55\u50cf\u7d20\u4f4d\u7f6e\u3002<\/li>\n<\/ul>\n

      \u518d\u7531 applyTransform() \u7edf\u4e00\u5408\u6210\u53d8\u6362：<\/p>\n

      screenX = panX_ + worldX * zoom_
      \nscreenY = panY_ – worldY * zoom_ \/\/ Y \u8f74\u7ffb\u8f6c：\u4e16\u754c Y \u5411\u4e0a，\u5c4f\u5e55 Y \u5411\u4e0b<\/p>\n

      \u8981\u70b9：panX_\/panY_ \u7684\u8bed\u4e49\u662f\u300c\u4e16\u754c\u539f\u70b9\u843d\u5728\u89c6\u53e3\u7684\u54ea\u4e2a\u50cf\u7d20\u4f4d\u7f6e\u300d\u3002\u9006\u6620\u5c04\u5373 worldX=(screenX-panX_)\/zoom_\u3002\u9879\u76ee\u65e2\u6709\u7ecf\u9a8c（\u89c1 pan_root_cause_fix.md）\u5f3a\u8c03：\u4efb\u4f55\u53d8\u6362\u504f\u5dee\u7edd\u4e0d\u80fd\u56de\u5199 panX_\/panY_，\u5426\u5219\u5e73\u79fb\u6f02\u79fb\u3002\u672c\u6b21\u6539\u9020\u4e25\u683c\u9075\u5faa\u8be5\u7ea6\u5b9a\u2014\u2014\u9002\u914d \/ \u6846\u9009\u7f29\u653e\u90fd\u662f\u91cd\u65b0\u8ba1\u7b97 panX_\/panY_\/zoom_，\u800c\u975e\u589e\u91cf\u53e0\u52a0\u3002<\/p>\n

      2.3 \u539f fitView() \u7684\u95ee\u9898（\u6838\u5fc3\u7f3a\u9677）<\/h4>\n

      void<\/span> GraphicsView<\/span>::<\/span>fitView<\/span>(<\/span>)<\/span> {<\/span>
      \n zoom_ =<\/span> 4.0<\/span>;<\/span> \/\/ \u2190 \u5199\u6b7b\u6bd4\u4f8b<\/span>
      \n panX_ =<\/span> viewport<\/span>(<\/span>)<\/span> ?<\/span> viewport<\/span>(<\/span>)<\/span>-><\/span>width<\/span>(<\/span>)<\/span> \/<\/span> 2.0<\/span> :<\/span> 400<\/span>;<\/span>
      \n panY_ =<\/span> viewport<\/span>(<\/span>)<\/span> ?<\/span> viewport<\/span>(<\/span>)<\/span>-><\/span>height<\/span>(<\/span>)<\/span> \/<\/span> 2.0<\/span> :<\/span> 300<\/span>;<\/span>
      \n applyTransform<\/span>(<\/span>)<\/span>;<\/span>
      \n model_-><\/span>setViewScale<\/span>(<\/span>zoom_)<\/span>;<\/span>
      \n viewport<\/span>(<\/span>)<\/span>-><\/span>update<\/span>(<\/span>)<\/span>;<\/span>
      \n}<\/span><\/p>\n

      \u7ed3\u8bba：\u5b83\u53ea\u662f\u201c\u628a\u4e16\u754c\u539f\u70b9\u6446\u5230\u89c6\u53e3\u4e2d\u5fc3\u3001\u6bd4\u4f8b\u56fa\u5b9a\u4e3a 4\u201d，\u4e0e\u5185\u5bb9\u5b9e\u9645\u5927\u5c0f\u65e0\u5173\u3002\u56e0\u6b64\u7528\u6237\u70b9\u51fb\u3010\u9002\u914d\u7a97\u53e3\u3011\u540e，\u56fe\u5f62\u5e38\u5e38\u8fc7\u5927（\u8dd1\u51fa\u89c6\u53e3）\u6216\u8fc7\u5c0f（\u7f29\u5728\u4e00\u89d2），\u5373\u201c\u672a\u9002\u914d\u201d\u3002\u8fd9\u662f\u9700\u6c42 1 \u7684\u6839\u56e0\u3002<\/p>\n

      \u5bf9\u6bd4：\u65c1\u8fb9\u5df2\u6709\u7684 fitToRect(r) \u624d\u5177\u5907\u6b63\u786e\u7684\u9002\u914d\u601d\u8def：<\/p>\n

      void<\/span> GraphicsView<\/span>::<\/span>fitToRect<\/span>(<\/span>const<\/span> QRectF&<\/span> r)<\/span> {<\/span>
      \n .<\/span>.<\/span>.<\/span>
      \n const<\/span> double<\/span> margin =<\/span> 0.92<\/span>;<\/span> \/\/ \u7559\u8fb9\u8ddd<\/span>
      \n double<\/span> z =<\/span> std::<\/span>min<\/span>(<\/span>vw \/<\/span> r.<\/span>width<\/span>(<\/span>)<\/span>,<\/span> vh \/<\/span> r.<\/span>height<\/span>(<\/span>)<\/span>)<\/span> *<\/span> margin;<\/span>
      \n z =<\/span> qBound<\/span>(<\/span>0.05<\/span>,<\/span> z,<\/span> 500.0<\/span>)<\/span>;<\/span>
      \n zoom_ =<\/span> z;<\/span>
      \n const<\/span> double<\/span> cx =<\/span> r.<\/span>center<\/span>(<\/span>)<\/span>.<\/span>x<\/span>(<\/span>)<\/span>,<\/span> cy =<\/span> r.<\/span>center<\/span>(<\/span>)<\/span>.<\/span>y<\/span>(<\/span>)<\/span>;<\/span>
      \n panX_ =<\/span> vw \/<\/span> 2.0<\/span> –<\/span> cx *<\/span> z;<\/span>
      \n panY_ =<\/span> vh \/<\/span> 2.0<\/span> +<\/span> cy *<\/span> z;<\/span> \/\/ Y \u7ffb\u8f6c<\/span>
      \n .<\/span>.<\/span>.<\/span>
      \n}<\/span><\/p>\n

      \u5373：\u5bf9\u7ed9\u5b9a\u4e16\u754c\u77e9\u5f62，z = min(vw\/W, vh\/H) \u53ef\u4f7f\u77e9\u5f62\u6070\u597d\u5d4c\u5165\u89c6\u53e3，\u518d\u628a\u77e9\u5f62\u4e2d\u5fc3\u79fb\u5230\u89c6\u53e3\u4e2d\u5fc3\u3002\u8fd9\u6b63\u662f\u6211\u4eec\u8981\u590d\u7528\u7684\u5185\u6838，\u53ea\u662f\u9700\u6c42\u8981\u6c42\u201c\u7cbe\u786e\u5145\u6ee1\u201d，\u56e0\u6b64\u8fb9\u8ddd\u7cfb\u6570\u9700\u4ece 0.92 \u6536\u7d27\u5230 1.0\u3002<\/p>\n

      2.4 \u5750\u6807\u8f74\u4e0e\u63d0\u793a\u6587\u5b57\u7684\u7ed8\u5236\u5c42\u7ea7（\u5173\u952e\u53d1\u73b0）<\/h4>\n

      \u9700\u6c42\u7279\u522b\u5f3a\u8c03\u300c\u4e0d\u5305\u62ec\u5750\u6807\u8f74\u4e0e\u7a0b\u5e8f\u63d0\u793a\u6587\u5b57\u300d\u3002\u8c03\u7814\u7ed8\u5236\u4ee3\u7801\u540e\u786e\u8ba4：<\/p>\n

        \n
      • \u5750\u6807\u8f74（drawAxes）\u4e0e\u63d0\u793a\u6587\u5b57 HUD（drawForeground \u4e2d p->resetTransform() \u540e\u6309\u89c6\u53e3\u50cf\u7d20\u5750\u6807\u7ed8\u5236）\u90fd\u662f\u88c5\u9970\u6027\u8986\u76d6\u5c42：\n
          \n
        • \u5b83\u4eec\u4e0d\u662f model_->elements() \u4e2d\u7684\u56fe\u5143；<\/li>\n
        • \u7ed8\u5236\u524d\u8c03\u7528 resetTransform()，\u56e0\u6b64\u4e0e zoom_\/pan_ \u65e0\u5173，\u6052\u5b9a\u6309\u5c4f\u5e55\u50cf\u7d20\u7ed8\u5236\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n

          \u63a8\u8bba（\u7ed3\u8bba\u4e00）：\u53ea\u8981\u300c\u9002\u914d\u300d\u4e0e\u300c\u6846\u9009\u7f29\u653e\u300d\u7684\u53d6\u666f\u8303\u56f4\u53ea\u7531 model_->elements() \u8ba1\u7b97，\u5750\u6807\u8f74\/\u63d0\u793a\u6587\u5b57\u5c31\u5929\u7136\u88ab\u6392\u9664，\u4e14\u56e0\u4e3a\u6309\u50cf\u7d20\u7ed8\u5236，\u7f29\u653e\u540e\u5916\u89c2\u5b8c\u5168\u4e0d\u53d8\u3002\u65e0\u9700\u4e3a\u5b83\u4eec\u5199\u4efb\u4f55\u6392\u9664\u903b\u8f91\u3002\u8fd9\u76f4\u63a5\u6ee1\u8db3\u9a8c\u6536\u6807\u51c6 A2\/A3\u3002<\/p>\n

          2.5 \u65e2\u6709\u6846\u9009（marquee）\u673a\u5236<\/h4>\n

          \u53d1\u73b0\u89c6\u56fe\u4e2d\u5df2\u6709\u4e00\u5957\u201c\u6846\u9009\u9009\u62e9\u56fe\u5143\u201d\u7684\u4ea4\u4e92（marqueeActive_ \/ marquee_）：<\/p>\n

            \n
          • mousePressEvent：\u5de6\u952e\u6309\u4e0b \u2192 marqueeActive_=true，marquee_ \u8bb0\u5f55\u8d77\u70b9；<\/li>\n
          • mouseMoveEvent：\u66f4\u65b0 marquee_.setBottomRight(world) + viewport()->update()；<\/li>\n
          • mouseReleaseEvent：\u7ed3\u7b97\u9009\u4e2d\u3001\u6e05\u7a7a marquee_；<\/li>\n
          • drawForeground：\u753b\u84dd\u8272\u865a\u7ebf + \u534a\u900f\u660e\u586b\u5145\u7684\u6a61\u76ae\u7b4b（QPen \u8bbe Cosmetic，\u7ebf\u5bbd\u4e0d\u968f\u7f29\u653e\u53d8\u5316）\u3002<\/li>\n<\/ul>\n

            \u63a8\u8bba（\u7ed3\u8bba\u4e09）：\u7a97\u53e3\u7f29\u653e\u5e94\u590d\u7528\u8fd9\u5957\u4ea4\u4e92\u9aa8\u67b6（\u540c\u6837\u7684\u6309\u4e0b\/\u79fb\u52a8\/\u91ca\u653e\u4e09\u6bb5 + \u6a61\u76ae\u7b4b\u7ed8\u5236），\u4f46\u5fc5\u987b\u662f\u72ec\u7acb\u7684\u72b6\u6001\u53d8\u91cf（zoomBoxMode_\/zoomBoxActive_\/zoomBoxRect_），\u56e0\u4e3a\u4e24\u8005\u8bed\u4e49\u4e0d\u540c（\u4e00\u4e2a\u9009\u56fe\u5143\u3001\u4e00\u4e2a\u6539\u89c6\u53e3）\u4e14\u9700\u5e76\u5b58\u3002<\/p>\n

            2.6 \u89c6\u56fe\u83dc\u5355 \/ \u5de5\u5177\u680f\u63a5\u7ebf<\/h4>\n

            \u68c0\u7d22 MainWindow.cpp \u786e\u8ba4：<\/p>\n

              \n
            • \u89c6\u56fe\u83dc\u5355\u5df2\u5b58\u5728 \u9002\u914d\u7a97\u53e3 (Ctrl+0) \u2192 view_->fitView()，\u5de5\u5177\u680f\u4e5f\u6709\u300c\u9002\u914d\u300d\u6309\u94ae \u2192 \u5373\u9700\u6c42 1 \u53ea\u9700\u6539 fitView() \u7684\u884c\u4e3a，\u83dc\u5355\u9879\u65e0\u9700\u65b0\u589e；<\/li>\n
            • \u5de5\u5177\u680f\/\u83dc\u5355\u52a8\u4f5c\u901a\u8fc7\u672c\u5730\u8f85\u52a9 mk(menu, text, shortcut, lambda)（\u5efa\u83dc\u5355\u9879）\u4e0e act(label, tooltip, shortcut, iconId, lambda)（\u5efa\u5e26\u56fe\u6807\u5de5\u5177\u6309\u94ae）\u521b\u5efa\u3002<\/li>\n<\/ul>\n

              \u7ed3\u8bba：\u9700\u6c42 2 \u53ea\u9700\u5728\u3010\u9002\u914d\u7a97\u53e3\u3011\u540e\u65b0\u589e\u4e00\u4e2a\u52a8\u4f5c，\u590d\u7528 mk()\/act()，\u5e76\u7ed9 icons::make() \u8865\u4e00\u679a zoombox \u56fe\u6807\u3002<\/p>\n

              \n

              3. \u5173\u952e\u63a8\u7406\u4e0e\u7ed3\u8bba<\/h3>\n

              \u5c06\u8c03\u7814\u7ed3\u8bba\u5f52\u7eb3\u4e3a\u56db\u6761\u8bbe\u8ba1\u51b3\u7b56：<\/p>\n\n#\u95ee\u9898\u7ed3\u8bba\u4f9d\u636e<\/tr>\n\n\n\n\n\n
              \u4e00<\/td>\n\u5750\u6807\u8f74\/\u63d0\u793a\u6587\u5b57\u600e\u4e48\u6392\u9664？<\/td>\n\u4e0d\u6392\u9664，\u5b83\u4eec\u672c\u5c31\u4e0d\u5728 model_->elements() \u4e14\u6309\u50cf\u7d20\u7ed8\u5236<\/td>\n\u00a72.4<\/td>\n<\/tr>\n
              \u4e8c<\/td>\n\u7528\u54ea\u4e2a\u5305\u56f4\u76d2\u505a\u300c\u7cbe\u786e\u5145\u6ee1\u300d？<\/td>\n\u4e0d\u80fd\u7528 boundingRect()，\u9700\u65b0\u589e geometryBounds()<\/td>\n\u00a73.2<\/td>\n<\/tr>\n
              \u4e09<\/td>\n\u6846\u9009\u4ea4\u4e92\u600e\u4e48\u5b9e\u73b0？<\/td>\n\u590d\u7528 marquee \u9aa8\u67b6 + \u72ec\u7acb\u72b6\u6001<\/td>\n\u00a72.5<\/td>\n<\/tr>\n
              \u56db<\/td>\n\u6846\u9009\u533a\u57df\u2192\u89c6\u53e3\u7684\u6620\u5c04？<\/td>\n\u590d\u7528 fitWorldRect() \u5185\u6838<\/td>\n\u00a73.3<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

              3.2 \u7ed3\u8bba\u4e8c\u5c55\u5f00：\u4e3a\u4ec0\u4e48\u4e0d\u80fd\u7528 boundingRect()<\/h4>\n

              ElementItem::boundingRect() \u4e3a\u4e86\u8ba9\u9f20\u6807\u62fe\u53d6\u66f4\u5bbd\u677e，\u4f1a\u5728\u51e0\u4f55\u5916\u5305\u88f9\u4e00\u5c42 cosmetic \u63cf\u8fb9\u4f59\u91cf（\u7ea6 1.5 \u4e16\u754c\u5355\u4f4d）\u3002\u82e5\u7528\u5b83\u6765\u9002\u914d：<\/p>\n

              \u5305\u56f4\u76d2\u88ab\u4eba\u4e3a\u653e\u5927 \u2192 \u7f29\u653e\u7cfb\u6570 z = min(vw\/W, vh\/H) \u504f\u5c0f \u2192 \u53d6\u666f\u7565\u5fae\u4e0d\u6ee1，\u8fbe\u4e0d\u5230\u300c\u7cbe\u786e\u5145\u6ee1\u300d\u3002<\/p>\n

              \u5bf9\u7b56：\u65b0\u589e ElementItem::geometryBounds() = rawBounds（\u7eaf\u51e0\u4f55\u3001\u96f6\u63cf\u8fb9\u81a8\u80c0），\u4ec5\u7528\u4e8e\u53d6\u666f\u8ba1\u7b97\u3002elementSceneBounds()（\u62fe\u53d6\u7528，\u4fdd\u7559\u81a8\u80c0）\u4fdd\u6301\u4e0d\u53d8\u3002<\/p>\n

              3.3 \u7ed3\u8bba\u4e09 \/ \u56db\u5c55\u5f00：\u7edf\u4e00\u9002\u914d\u5185\u6838<\/h4>\n

              \u4e24\u4e2a\u547d\u4ee4\u7684\u516c\u5171\u52a8\u4f5c\u662f\u201c\u628a\u67d0\u4e2a\u4e16\u754c\u77e9\u5f62 A \u7cbe\u786e\u94fa\u6ee1\u89c6\u53e3\u201d\u3002\u56e0\u6b64\u63d0\u53d6\u79c1\u6709\u5185\u6838：<\/p>\n

              fitWorldRect(r, margin=1.0):
              \n z = min(vw \/ r.width(), vh \/ r.height()) * margin \/\/ \u53d6\u53d7\u9650\u7ef4\u5ea6
              \n z = qBound(ZMIN, z, ZMAX)
              \n zoom_ = z
              \n panX_ = vw\/2 – r.center().x * z
              \n panY_ = vh\/2 + r.center().y * z \/\/ Y \u7ffb\u8f6c
              \n applyTransform(); model_->setViewScale(z);<\/p>\n

                \n
              • \u9002\u914d\u7a97\u53e3 = fitWorldRect(contentBounds(), 1.0)<\/li>\n
              • \u7a97\u53e3\u7f29\u653e = fitWorldRect(\u6846\u9009\u4e16\u754c\u77e9\u5f62, 1.0)<\/li>\n<\/ul>\n

                margin=1.0 \u5373\u201c\u7cbe\u786e\u5145\u6ee1\u201d（\u65e7 fitToRect \u7684 0.92 \u662f\u7559\u8fb9，\u4e0d\u6ee1\u8db3\u9700\u6c42）\u3002<\/p>\n

                3.4 \u300c\u7cbe\u786e\u5145\u6ee1\u300d\u7684\u51e0\u4f55\u542b\u4e49<\/h4>\n

                \u8bbe\u89c6\u53e3 vw\u00d7vh，\u5185\u5bb9 W\u00d7H，z = min(vw\/W, vh\/H)：<\/p>\n

                  \n
                • \u82e5 vw\/W \u2264 vh\/H（\u5bbd\u4e3a\u53d7\u9650\u7ef4）：\u7f29\u653e\u540e\u5185\u5bb9\u5bbd\u5ea6 W\u00b7z = vw \u6070\u597d\u94fa\u6ee1\u89c6\u53e3\u5bbd，\u9ad8\u5ea6 H\u00b7z < vh \u5c45\u4e2d \u2192 \u5185\u5bb9\u5c4f\u5e55\u77e9\u5f62\u4e3a x \u2208 [0, vw]\u3001y \u5c45\u4e2d；<\/li>\n
                • \u53cd\u4e4b\u4ea6\u7136\u3002<\/li>\n<\/ul>\n

                  \u8fd9\u6b63\u662f\u9a8c\u6536\u6807\u51c6 A1\/B2 \u7684\u6570\u5b66\u5f62\u5f0f，\u4e5f\u662f\u65b0\u6d4b\u8bd5\u65ad\u8a00\u7684\u4f9d\u636e\u3002<\/p>\n

                  \n

                  4. \u8bbe\u8ba1\u65b9\u6848<\/h3>\n

                  4.1 \u65b0\u589e API（GraphicsView.h）<\/h4>\n

                  public<\/span>:<\/span>
                  \n void<\/span> fitView<\/span>(<\/span>)<\/span>;<\/span> \/\/ \u8bed\u4e49\u53d8\u66f4：\u5185\u5bb9\u9002\u914d<\/span>
                  \n void<\/span> fitToRect<\/span>(<\/span>const<\/span> QRectF&<\/span> world)<\/span>;<\/span> \/\/ \u4fdd\u6301\u4e0d\u53d8（\u56fe\u5e45\u9002\u914d\u7528）<\/span><\/p>\n

                  \/\/ \u7a97\u53e3\u7f29\u653e（\u6846\u9009\u7f29\u653e）<\/span>
                  \n void<\/span> setZoomBoxMode<\/span>(<\/span>bool<\/span> on)<\/span>;<\/span>
                  \n bool<\/span> zoomBoxMode<\/span>(<\/span>)<\/span> const<\/span>;<\/span><\/p>\n

                  private<\/span>:<\/span>
                  \n QRectF contentBounds<\/span>(<\/span>)<\/span> const<\/span>;<\/span> \/\/ \u6240\u6709\u53ef\u89c1\u56fe\u5143\u7684\u51e0\u4f55\u5e76\u96c6<\/span>
                  \n void<\/span> fitWorldRect<\/span>(<\/span>const<\/span> QRectF&<\/span> r,<\/span> double<\/span> margin =<\/span> 1.0<\/span>)<\/span>;<\/span> \/\/ \u9002\u914d\u5185\u6838<\/span><\/p>\n

                  bool<\/span> zoomBoxMode_ =<\/span> false<\/span>;<\/span> \/\/ \u662f\u5426\u5904\u4e8e\u6846\u9009\u6a21\u5f0f<\/span>
                  \n bool<\/span> zoomBoxActive_ =<\/span> false<\/span>;<\/span> \/\/ \u662f\u5426\u6b63\u5728\u62d6\u6846<\/span>
                  \n QRectF zoomBoxRect_;<\/span> \/\/ \u6846\u9009\u4e16\u754c\u77e9\u5f62<\/span><\/p>\n

                  \/\/ ElementItem：<\/span>
                  \npublic<\/span>:<\/span>
                  \n QRectF geometryBounds<\/span>(<\/span>)<\/span> const<\/span>;<\/span> \/\/ = rawBounds，\u96f6\u63cf\u8fb9\u6269\u5c55（\u53d6\u666f\u4e13\u7528）<\/span><\/p>\n

                  4.2 \u72b6\u6001\u673a<\/h4>\n

                  \u70b9\u51fb\u3010\u7a97\u53e3\u7f29\u653e\u3011
                  \n IDLE \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u25ba ZOOMBOX_MODE（\u5341\u5b57\u5149\u6807）
                  \n \u25b2 \u2502 \u5de6\u952e\u6309\u4e0b
                  \n \u2502 Esc \/ \u53f3\u952e \u25bc
                  \n \u2502 ZOOMBOX_DRAG（\u6a61\u76ae\u7b4b\u5b9e\u65f6\u66f4\u65b0）
                  \n \u2502 \u2502 \u5de6\u952e\u91ca\u653e
                  \n \u2502 \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2534\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510
                  \n \u2502 \u2502 \u6709\u9762\u79ef：fitWorldRect(\u6846) \u2192 \u7f29\u653e\u5e76\u9000\u51fa \u2502
                  \n \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518 \u65e0\u9762\u79ef（\u5355\u51fb）：\u9000\u5316\u4e3a fitView() \u2192 \u9000\u51fa \u2502<\/p>\n

                  4.3 \u4e8b\u4ef6\u63a5\u5165\u70b9<\/h4>\n\n\u4e8b\u4ef6\u5904\u7406<\/tr>\n\n\n\n\n\n\n
                  mousePressEvent<\/td>\n\u6846\u9009\u6a21\u5f0f\u4e0b\u5de6\u952e \u2192 zoomBoxActive_ = true\u3001\u8bb0\u5f55\u8d77\u70b9；\u53f3\u952e \u2192 \u53d6\u6d88\u5e76\u9000\u51fa<\/td>\n<\/tr>\n
                  mouseMoveEvent<\/td>\n\u6846\u9009\u62d6\u62fd\u4e2d \u2192 \u66f4\u65b0 zoomBoxRect_ + \u5237\u65b0（\u7f6e\u4e8e\u5206\u53d1\u94fe\u6700\u524d，\u89c1 \u00a78.2）<\/td>\n<\/tr>\n
                  mouseReleaseEvent<\/td>\n\u5de6\u952e\u91ca\u653e \u2192 \u7ed3\u7b97\u7f29\u653e（\u6216\u9000\u5316\u4e3a\u9002\u914d）\u5e76\u9000\u51fa\u6a21\u5f0f<\/td>\n<\/tr>\n
                  drawForeground<\/td>\n\u7ed8\u5236\u7eff\u8272\u865a\u7ebf\u6a61\u76ae\u7b4b（Cosmetic \u7ebf\u5bbd）<\/td>\n<\/tr>\n
                  keyPressEvent<\/td>\nEsc \u2192 \u53d6\u6d88\u5e76\u9000\u51fa\u6a21\u5f0f<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
                  \n

                  5. \u5b9e\u73b0\u7ec6\u8282<\/h3>\n

                  5.1 contentBounds()：\u904d\u5386\u53ef\u89c1\u56fe\u5143\u53d6\u5e76\u96c6<\/h4>\n

                  QRectF GraphicsView<\/span>::<\/span>contentBounds<\/span>(<\/span>)<\/span> const<\/span> {<\/span>
                  \n QRectF b;<\/span>
                  \n bool<\/span> first =<\/span> true<\/span>;<\/span>
                  \n for<\/span> (<\/span>const<\/span> auto<\/span>&<\/span> e :<\/span> model_-><\/span>elements<\/span>(<\/span>)<\/span>)<\/span> {<\/span>
                  \n if<\/span> (<\/span>!<\/span>e.<\/span>visible)<\/span> continue<\/span>;<\/span>
                  \n const<\/span> QRectF r =<\/span> elementGeometryBounds<\/span>(<\/span>e)<\/span>;<\/span> \/\/ \u7528 geometryBounds，\u975e\u62fe\u53d6\u7528 bounds<\/span>
                  \n if<\/span> (<\/span>r.<\/span>isNull<\/span>(<\/span>)<\/span>)<\/span> continue<\/span>;<\/span> \/\/ \u8df3\u8fc7\u9000\u5316（\u7a7a\u6587\u672c\u7b49）<\/span>
                  \n b =<\/span> first ?<\/span> r :<\/span> b.<\/span>united<\/span>(<\/span>r)<\/span>;<\/span>
                  \n first =<\/span> false<\/span>;<\/span>
                  \n }<\/span>
                  \n return<\/span> b;<\/span>
                  \n}<\/span><\/p>\n

                  \u26a0\ufe0f \u5355\u5143\u7d20\u4e0e\u6574\u6279：geo::elementBounds() \u53ea\u63a5\u53d7\u5355\u4e2a Element；\u6574\u6279\u5305\u56f4\u76d2\u5fc5\u987b for \u9010\u4e2a .united()（\u672c\u9879\u76ee\u65e2\u6709\u7ea6\u5b9a，\u52ff\u8bef\u7528）\u3002<\/p>\n

                  5.2 fitWorldRect()：\u9002\u914d\u5185\u6838（Y \u7ffb\u8f6c\u662f\u5173\u952e）<\/h4>\n

                  void<\/span> GraphicsView<\/span>::<\/span>fitWorldRect<\/span>(<\/span>const<\/span> QRectF&<\/span> r,<\/span> double<\/span> margin)<\/span> {<\/span>
                  \n if<\/span> (<\/span>!<\/span>viewport<\/span>(<\/span>)<\/span> ||<\/span> r.<\/span>width<\/span>(<\/span>)<\/span> <<\/span> 1e-6<\/span> ||<\/span> r.<\/span>height<\/span>(<\/span>)<\/span> <<\/span> 1e-6<\/span>)<\/span> return<\/span>;<\/span>
                  \n const<\/span> double<\/span> vw =<\/span> viewport<\/span>(<\/span>)<\/span>-><\/span>width<\/span>(<\/span>)<\/span>,<\/span> vh =<\/span> viewport<\/span>(<\/span>)<\/span>-><\/span>height<\/span>(<\/span>)<\/span>;<\/span>
                  \n double<\/span> z =<\/span> std::<\/span>min<\/span>(<\/span>vw \/<\/span> r.<\/span>width<\/span>(<\/span>)<\/span>,<\/span> vh \/<\/span> r.<\/span>height<\/span>(<\/span>)<\/span>)<\/span> *<\/span> margin;<\/span> \/\/ \u53d7\u9650\u7ef4<\/span>
                  \n z =<\/span> qBound<\/span>(<\/span>0.05<\/span>,<\/span> z,<\/span> 500.0<\/span>)<\/span>;<\/span>
                  \n zoom_ =<\/span> z;<\/span>
                  \n const<\/span> double<\/span> cx =<\/span> r.<\/span>center<\/span>(<\/span>)<\/span>.<\/span>x<\/span>(<\/span>)<\/span>,<\/span> cy =<\/span> r.<\/span>center<\/span>(<\/span>)<\/span>.<\/span>y<\/span>(<\/span>)<\/span>;<\/span>
                  \n panX_ =<\/span> vw \/<\/span> 2.0<\/span> –<\/span> cx *<\/span> z;<\/span>
                  \n panY_ =<\/span> vh \/<\/span> 2.0<\/span> +<\/span> cy *<\/span> z;<\/span> \/\/ Y \u7ffb\u8f6c：\u4e16\u754c Y \u5411\u4e0a \u2192 \u5c4f\u5e55 Y \u5411\u4e0b<\/span>
                  \n applyTransform<\/span>(<\/span>)<\/span>;<\/span>
                  \n model_-><\/span>setViewScale<\/span>(<\/span>z)<\/span>;<\/span>
                  \n viewport<\/span>(<\/span>)<\/span>-><\/span>update<\/span>(<\/span>)<\/span>;<\/span>
                  \n}<\/span><\/p>\n

                    \n
                  • \u9664\u96f6\u4fdd\u62a4：\u77e9\u5f62\u9000\u5316\u65f6\u76f4\u63a5\u8fd4\u56de（\u4fdd\u7559\u539f\u89c6\u56fe）；<\/li>\n
                  • \u7f29\u653e\u94b3\u4f4d [0.05, 500] \u9632\u6b62\u6781\u7aef\u7f29\u653e；<\/li>\n
                  • margin=1.0 \u2192 \u7cbe\u786e\u5145\u6ee1\u3002<\/li>\n<\/ul>\n

                    5.3 fitView() \u91cd\u5199<\/h4>\n

                    void<\/span> GraphicsView<\/span>::<\/span>fitView<\/span>(<\/span>)<\/span> {<\/span>
                    \n const<\/span> QRectF b =<\/span> contentBounds<\/span>(<\/span>)<\/span>;<\/span>
                    \n if<\/span> (<\/span>b.<\/span>isNull<\/span>(<\/span>)<\/span>)<\/span> {<\/span> \/\/ \u7a7a\u56fe\u7eb8：\u56de\u9000\u5230\u539f\u70b9\u5c45\u4e2d<\/span>
                    \n zoom_ =<\/span> 4.0<\/span>;<\/span>
                    \n panX_ =<\/span> viewport<\/span>(<\/span>)<\/span> ?<\/span> viewport<\/span>(<\/span>)<\/span>-><\/span>width<\/span>(<\/span>)<\/span> \/<\/span> 2.0<\/span> :<\/span> 400<\/span>;<\/span>
                    \n panY_ =<\/span> viewport<\/span>(<\/span>)<\/span> ?<\/span> viewport<\/span>(<\/span>)<\/span>-><\/span>height<\/span>(<\/span>)<\/span> \/<\/span> 2.0<\/span> :<\/span> 300<\/span>;<\/span>
                    \n applyTransform<\/span>(<\/span>)<\/span>;<\/span> model_-><\/span>setViewScale<\/span>(<\/span>zoom_)<\/span>;<\/span> viewport<\/span>(<\/span>)<\/span>-><\/span>update<\/span>(<\/span>)<\/span>;<\/span>
                    \n return<\/span>;<\/span>
                    \n }<\/span>
                    \n fitWorldRect<\/span>(<\/span>b,<\/span> 1.0<\/span>)<\/span>;<\/span> \/\/ \u7cbe\u786e\u5145\u6ee1<\/span>
                    \n}<\/span><\/p>\n

                    \u517c\u5bb9\u6027\u8bbe\u8ba1：\u7a7a\u56fe\u7eb8\u56de\u9000\u5230\u65e7\u7684 zoom=4 \u884c\u4e3a，\u4fdd\u8bc1\u65e2\u6709\u5355\u5143\u7d20\u573a\u666f（\u5982\u53ea\u6709\u4e00\u6761\u7ebf\u7684\u6d4b\u8bd5）\u884c\u4e3a\u4e0d\u53d8（\u89c1 \u00a76）\u3002<\/p>\n

                    5.4 \u6846\u9009\u4e09\u4e8b\u4ef6（\u8282\u9009）<\/h4>\n

                    \/\/ press<\/span>
                    \nif<\/span> (<\/span>zoomBoxMode_)<\/span> {<\/span>
                    \n if<\/span> (<\/span>e-><\/span>button<\/span>(<\/span>)<\/span> ==<\/span> Qt::<\/span>RightButton)<\/span> {<\/span> setZoomBoxMode<\/span>(<\/span>false<\/span>)<\/span>;<\/span> e-><\/span>accept<\/span>(<\/span>)<\/span>;<\/span> return<\/span>;<\/span> }<\/span>
                    \n if<\/span> (<\/span>e-><\/span>button<\/span>(<\/span>)<\/span> ==<\/span> Qt::<\/span>LeftButton)<\/span> {<\/span>
                    \n zoomBoxActive_ =<\/span> true<\/span>;<\/span>
                    \n zoomBoxRect_ =<\/span> QRectF<\/span>(<\/span>mapToScene<\/span>(<\/span>e-><\/span>position<\/span>(<\/span>)<\/span>.<\/span>toPoint<\/span>(<\/span>)<\/span>)<\/span>,<\/span> QSizeF<\/span>(<\/span>0<\/span>,<\/span> 0<\/span>)<\/span>)<\/span>;<\/span>
                    \n e-><\/span>accept<\/span>(<\/span>)<\/span>;<\/span> return<\/span>;<\/span>
                    \n }<\/span>
                    \n}<\/span>
                    \n\/\/ move（\u7f6e\u4e8e\u5206\u53d1\u94fe\u6700\u524d）<\/span>
                    \nif<\/span> (<\/span>zoomBoxActive_)<\/span> {<\/span>
                    \n zoomBoxRect_.<\/span>setBottomRight<\/span>(<\/span>mapToScene<\/span>(<\/span>e-><\/span>position<\/span>(<\/span>)<\/span>.<\/span>toPoint<\/span>(<\/span>)<\/span>)<\/span>)<\/span>;<\/span>
                    \n viewport<\/span>(<\/span>)<\/span>-><\/span>update<\/span>(<\/span>)<\/span>;<\/span> e-><\/span>accept<\/span>(<\/span>)<\/span>;<\/span> return<\/span>;<\/span>
                    \n}<\/span>
                    \n\/\/ release<\/span>
                    \nif<\/span> (<\/span>zoomBoxActive_ &&<\/span> e-><\/span>button<\/span>(<\/span>)<\/span> ==<\/span> Qt::<\/span>LeftButton)<\/span> {<\/span>
                    \n zoomBoxActive_ =<\/span> false<\/span>;<\/span>
                    \n const<\/span> QRectF r =<\/span> zoomBoxRect_.<\/span>normalized<\/span>(<\/span>)<\/span>;<\/span>
                    \n setZoomBoxMode<\/span>(<\/span>false<\/span>)<\/span>;<\/span> \/\/ \u5148\u9000\u51fa\u6a21\u5f0f<\/span>
                    \n if<\/span> (<\/span>r.<\/span>width<\/span>(<\/span>)<\/span> ><\/span> 1e-6<\/span> &&<\/span> r.<\/span>height<\/span>(<\/span>)<\/span> ><\/span> 1e-6<\/span>)<\/span> fitWorldRect<\/span>(<\/span>r,<\/span> 1.0<\/span>)<\/span>;<\/span>
                    \n else<\/span> fitView<\/span>(<\/span>)<\/span>;<\/span> \/\/ \u5355\u51fb \u2192 \u9000\u5316\u4e3a\u9002\u914d<\/span>
                    \n e-><\/span>accept<\/span>(<\/span>)<\/span>;<\/span> return<\/span>;<\/span>
                    \n}<\/span><\/p>\n

                    5.5 \u6a61\u76ae\u7b4b\u7ed8\u5236（drawForeground）<\/h4>\n

                    if<\/span> (<\/span>zoomBoxActive_)<\/span> {<\/span>
                    \n p-><\/span>save<\/span>(<\/span>)<\/span>;<\/span>
                    \n QPen zp<\/span>(<\/span>QColor<\/span>(<\/span>0<\/span>,<\/span> 170<\/span>,<\/span> 0<\/span>)<\/span>)<\/span>;<\/span> \/\/ \u7eff\u8272，\u4e0e\u84dd\u8272\u9009\u62e9\u6846\u533a\u5206<\/span>
                    \n zp.<\/span>setStyle<\/span>(<\/span>Qt::<\/span>DashLine)<\/span>;<\/span>
                    \n zp.<\/span>setCosmetic<\/span>(<\/span>true<\/span>)<\/span>;<\/span> \/\/ \u7ebf\u5bbd\u6309\u5c4f\u5e55\u50cf\u7d20，\u4e0d\u968f\u7f29\u653e<\/span>
                    \n p-><\/span>setPen<\/span>(<\/span>zp)<\/span>;<\/span>
                    \n p-><\/span>setBrush<\/span>(<\/span>QColor<\/span>(<\/span>0<\/span>,<\/span> 170<\/span>,<\/span> 0<\/span>,<\/span> 28<\/span>)<\/span>)<\/span>;<\/span>
                    \n p-><\/span>drawRect<\/span>(<\/span>zoomBoxRect_.<\/span>normalized<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
                    \n p-><\/span>restore<\/span>(<\/span>)<\/span>;<\/span>
                    \n}<\/span><\/p>\n

                    5.6 \u56fe\u6807\u4e0e\u63a5\u7ebf<\/h4>\n
                      \n
                    • icons.h \u65b0\u589e "zoombox"：\u865a\u7ebf\u6846\u3001\u56db\u89d2\u6298\u7ebf\u4e0e\u53f3\u4e0b\u89d2\u653e\u5927\u955c，\u98ce\u683c\u4e0e\u65e2\u6709\u77e2\u91cf\u56fe\u6807\u4e00\u81f4\u3002<\/li>\n
                    • MainWindow.cpp：\u89c6\u56fe\u83dc\u5355\u3010\u9002\u914d\u7a97\u53e3\u3011\u540e\u65b0\u589e\u3010\u7a97\u53e3\u7f29\u653e\u3011(Ctrl+9) \u2192 view_->setZoomBoxMode(true)；\u5de5\u5177\u680f\u540c\u6b65\u65b0\u589e\u6309\u94ae\u3002<\/li>\n<\/ul>\n
                      \n

                      6. \u517c\u5bb9\u6027\u4e0e\u56de\u5f52\u98ce\u9669\u5206\u6790<\/h3>\n

                      fitView() \u7684\u8bed\u4e49\u4ece\u300czoom=4\u300d\u53d8\u4e3a\u300c\u5185\u5bb9\u9002\u914d\u300d，\u51e1\u8c03\u7528\u5b83\u7684\u5730\u65b9\u90fd\u9700\u590d\u6838\u3002\u68c0\u7d22\u5230\u4e09\u5904\u6d4b\u8bd5：<\/p>\n\n\u6d4b\u8bd5\u662f\u5426\u53d7\u5f71\u54cd\u5206\u6790<\/tr>\n\n\n\n\n
                      ViewRenderTest<\/td>\n\u5426<\/td>\n\u53ea\u65ad\u8a00\u62d6\u62fd\u524d\u540e\u5750\u6807\u5dee，\u4e0e\u7edd\u5bf9\u53d8\u6362\u65e0\u5173<\/td>\n<\/tr>\n
                      ViewRenderTest2<\/td>\n\u5426<\/td>\n\u65ad\u8a00\u62d6\u62fd delta；\u5355\u7ebf\u573a\u666f\u89e6\u53d1\u96f6\u9ad8\u56de\u9000 \u2192 zoom=4，\u4e0e\u65e7\u884c\u4e3a\u4e00\u81f4<\/td>\n<\/tr>\n
                      SelectWindowTest<\/td>\n\u5426<\/td>\n\u4e16\u754c\u2194\u5c4f\u5e55\u6620\u5c04\u81ea\u6d3d（\u7528\u9006\u6620\u5c04\u53d6\u70b9），\u53d8\u6362\u65e0\u5173<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                      \u7ed3\u8bba：\u4e09\u4e2a\u6d4b\u8bd5\u5747\u4e3a\u300c\u53d8\u6362\u81ea\u6d3d\u300d\u6216\u300c\u96f6\u5c3a\u5bf8\u56de\u9000\u300d，\u6539\u9020\u4e0d\u5f71\u54cd\u5176\u7ed3\u679c\u3002\u6b64\u5916 elementSceneBounds()（\u62fe\u53d6\u7528）\u4fdd\u6301\u539f\u6837，\u4ec5\u65b0\u589e geometryBounds()，\u4e0d\u4f1a\u6539\u53d8\u9009\u62e9\/\u547d\u4e2d\u884c\u4e3a\u3002<\/p>\n

                      \n

                      7. \u9a8c\u8bc1\u65b9\u6cd5\u4e0e\u7ed3\u679c<\/h3>\n

                      7.1 \u65b0\u589e\u6d4b\u8bd5 ViewFitZoomTest（11 \u65ad\u8a00，\u5168\u7eff）<\/h4>\n

                      \u5173\u952e\u9a8c\u8bc1（800\u00d7600 \u89c6\u53e3）：<\/p>\n

                        \n
                      • \u9002\u914d\u7a97\u53e3：\u5185\u5bb9\u5c4f\u5e55\u77e9\u5f62\u7cbe\u786e\u4e3a x[0,800] y[100,500] \u2014\u2014 \u5373\u53d7\u9650\u7ef4\u5ea6（\u5bbd\u5ea6）\u6070\u597d\u94fa\u6ee1\u89c6\u53e3，\u53e6\u4e00\u7ef4\u5ea6（\u9ad8\u5ea6 400）\u5c45\u4e2d \u2192 \u6ee1\u8db3\u300c\u7cbe\u786e\u5145\u6ee1\u300d；<\/li>\n
                      • \u7a97\u53e3\u7f29\u653e：\u6846\u9009 40\u00d730 \u533a\u57df\u540e，zoom == min(800\/40, 600\/30) \u4e14\u9009\u6846\u4e2d\u5fc3\u843d\u5728\u89c6\u53e3\u4e2d\u5fc3 \u2192 \u6ee1\u8db3 z=min(vw\/W, vh\/H) + \u5c45\u4e2d；<\/li>\n
                      • \u9000\u5316：\u5355\u51fb（\u672a\u62d6\u51fa\u6709\u6548\u9762\u79ef）\u2192 \u9000\u5316\u4e3a\u9002\u914d\u7a97\u53e3；<\/li>\n
                      • \u9000\u51fa：\u7f29\u653e\u5b8c\u6210\u540e zoomBoxMode()==false\u3002<\/li>\n<\/ul>\n

                        7.2 \u56de\u5f52\u7ed3\u679c<\/h4>\n
                          \n
                        • ViewRenderTest PASS；<\/li>\n
                        • ViewRenderTest2 PASS；<\/li>\n
                        • SelectWindowTest \u5168\u90e8\u901a\u8fc7；<\/li>\n
                        • SketchCAD.exe（\u542b\u5bf9\u8bdd\u6846）\u7f16\u8bd1\u94fe\u63a5\u901a\u8fc7，\u65e0\u56de\u5f52\u3002<\/li>\n<\/ul>\n
                          \n

                          8. \u8e29\u5751\u8bb0\u5f55<\/h3>\n

                          8.1 \u6784\u5efa OOM（\u73af\u5883\u4fa7，\u975e\u4ee3\u7801\u95ee\u9898）<\/h4>\n

                          \u5e76\u884c ninja \u540c\u65f6\u7f16\u8bd1\u591a\u4e2a\u76ee\u6807\u65f6，cc1plus.exe: out of memory \u5bfc\u81f4\u4e2d\u9014 FAILED\u3002
                          \n\u5bf9\u7b56：\u6539\u4e3a -j 1 \u9010\u4e2a target \u7f16\u8bd1；\u82e5\u4ecd\u4e2d\u65ad，\u91cd\u8dd1\u589e\u91cf\u7eed\u7f16\u5373\u53ef\u901a\u8fc7\u3002\u540c\u4e00\u73b0\u8c61\u5728 SketchCAD \u4e3b\u76ee\u6807\u5df2\u5355\u72ec\u7f16\u8bd1\u6210\u529f，\u8bf4\u660e\u5e76\u975e\u4ee3\u7801\u9519\u8bef\u3002<\/p>\n

                          \u26a0\ufe0f \u7f16\u8bd1\/\u94fe\u63a5\u65f6 PATH \u5fc5\u987b\u542b mingw bin（C:\\\\Qt\\\\Tools\\\\mingw1310_64\\\\bin）\u3002\u7f3a\u5c11\u5b83\u65f6 g++ \u627e\u4e0d\u5230 libgcc\/libstdc++ \u8fd0\u884c\u65f6 \u2192 \u9759\u9ed8\u9000\u51fa\u7801 1\u3001\u96f6\u8bca\u65ad\u8f93\u51fa\u3002<\/p>\n

                          8.2 \u4e8b\u4ef6\u5206\u914d\u94fe\u987a\u5e8f（\u771f\u5b9e\u903b\u8f91 bug）<\/h4>\n

                          \u521d\u7248\u628a\u300c\u6846\u9009\u62d6\u62fd\u66f4\u65b0\u300d\u653e\u5728 mouseMoveEvent \u7684\u7ed8\u5236\u5b50\u5de5\u5177\u5b88\u536b\u4e4b\u540e，\u5bfc\u81f4\u82e5\u6070\u597d\u6709\u7ed8\u5236\u5de5\u5177\u5904\u4e8e\u6fc0\u6d3b\u6001，\u6846\u9009\u62d6\u62fd\u4f1a\u88ab\u63d0\u524d return \u541e\u6389\u3002
                          \n\u4fee\u590d：\u628a\u6846\u9009\u5757\u79fb\u5230 mouseMoveEvent \u5206\u53d1\u94fe\u6700\u524d（\u7d27\u968f\u533a\u57df\u62fe\u53d6\u6a21\u5f0f\u5224\u5b9a），\u786e\u4fdd\u5176\u4f18\u5148\u4e8e\u4efb\u4f55\u7ed8\u5236\u9884\u89c8\u903b\u8f91\u3002\u4fee\u590d\u540e\u6240\u6709\u6d4b\u8bd5\u4f9d\u65e7\u5168\u7eff\u3002<\/p>\n

                          8.3 \u6c99\u7bb1\u6587\u4ef6\u6e05\u7406<\/h4>\n

                          \u6279\u91cf Remove-Item \u4f1a\u88ab\u6c99\u7bb1 safe-delete \u62e6\u622a；\u9010\u6587\u4ef6 Remove-Item -LiteralPath \u6216 [System.IO.File]::Delete() \u53ef\u7528\u3002<\/p>\n

                          \n

                          9. \u7ed3\u8bba\u4e0e\u540e\u7eed<\/h3>\n

                          \u7ed3\u8bba：\u4e24\u6761\u89c6\u56fe\u547d\u4ee4\u5747\u5df2\u5b9e\u73b0\u5e76\u901a\u8fc7\u95ed\u73af\u9a8c\u8bc1\u3002<\/p>\n

                        • \u9002\u914d\u7a97\u53e3：\u7531\u300c\u5199\u6b7b zoom=4\u300d\u6539\u4e3a\u300c\u5185\u5bb9\u5305\u56f4\u76d2\u7cbe\u786e\u5145\u6ee1\u300d，\u5750\u6807\u8f74\/\u63d0\u793a\u6587\u5b57\u4f5c\u4e3a\u8986\u76d6\u5c42\u5929\u7136\u4e0d\u53d8；<\/li>\n
                        • \u7a97\u53e3\u7f29\u653e：\u65b0\u589e\u6846\u9009\u7f29\u653e，\u590d\u7528 marquee \u4ea4\u4e92\u9aa8\u67b6 + \u72ec\u7acb\u72b6\u6001 + \u7edf\u4e00 fitWorldRect() \u5185\u6838；<\/li>\n
                        • \u5173\u952e\u8bbe\u8ba1\u70b9：\u2460 \u8986\u76d6\u5c42\u6392\u9664\u7528\u300c\u7ed3\u6784\u6027\u9694\u79bb\u300d\u800c\u975e\u7279\u5224；\u2461 \u7528 geometryBounds() \u800c\u975e boundingRect() \u624d\u80fd\u300c\u7cbe\u786e\u5145\u6ee1\u300d；\u2462 \u7a7a\u56fe\u7eb8\u56de\u9000\u65e7\u884c\u4e3a\u4fdd\u517c\u5bb9\u3002<\/li>\n

                          \u540e\u7eed\u53ef\u6269\u5c55：<\/p>\n

                            \n
                          • \u6846\u9009\u7f29\u653e\u53ef\u589e\u52a0\u300c\u4e0a\u4e00\u6b65\u89c6\u56fe\u300d\u56de\u9000（\u89c6\u56fe\u5386\u53f2\u6808）；<\/li>\n
                          • contentBounds() \u76ee\u524d\u904d\u5386\u5168\u90e8\u56fe\u5143，\u5143\u7d20\u91cf\u6781\u5927\u65f6\u53ef\u8003\u8651 qgraphicsitem \u7684 sceneBoundingRect \u7f13\u5b58\u6216\u7a7a\u95f4\u7d22\u5f15\u52a0\u901f；<\/li>\n
                          • \u53ef\u9009：\u9002\u914d\u65f6\u5bf9\u9009\u4e2d\u96c6\u800c\u975e\u5168\u96c6\u53d6\u666f（\u9009\u533a\u9002\u914d）\u3002<\/li>\n<\/ul>\n
                            \n

                            \u6587\u6863\u72b6\u6001：\u4e0e\u5f53\u524d\u5b9e\u73b0\u4e00\u81f4\u3002\u82e5\u540e\u7eed\u4fee\u6539 fitView()\/fitWorldRect() \u7684\u8fb9\u8ddd\u6216\u94b3\u4f4d，\u8bf7\u540c\u6b65\u66f4\u65b0 \u00a75.2\u3001\u00a77.1\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

                            \u89c6\u56fe\u547d\u4ee4\u6539\u9020：\u9002\u914d\u7a97\u53e3（Fit）\u4e0e\u7a97\u53e3\u7f29\u653e（Zoom Box）\u2014\u2014\u8bbe\u8ba1\u4e0e\u5206\u6790\u6a21\u5757：src\/ui\/GraphicsView.{h,cpp}\u3001src\/ui\/MainWindow.cpp\u3001src\/ui\/icons.h
                            \n\u6d4b\u8bd5：tests\/view_fit_zoom_test.cpp（\u65b0\u589e target ViewFitZoomTest）
                            \n\u5173\u8054\u6587\u6863：<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[8512,2606],"topic":[],"class_list":["post-108086","post","type-post","status-publish","format-standard","hentry","category-server","tag-cad","tag-2606"],"yoast_head":"\n\u89c6\u56fe\u9002\u914d\u9769\u547d\uff1a\u7cbe\u51c6\u586b\u5145\u4e0e\u6846\u9009\u7f29\u653e - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wsisp.com\/helps\/108086.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u89c6\u56fe\u9002\u914d\u9769\u547d\uff1a\u7cbe\u51c6\u586b\u5145\u4e0e\u6846\u9009\u7f29\u653e - 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