区段复制优化

src/drawApp/commonApp.ts

@@ -9,6 +9,7 @@ import {
   KeyListener,
   calculateDistanceFromPointToLine,
   getRectangleCenter,
+  distance2,
 } from 'jl-graphic';
 import { TrainState } from './graphics/TrainInteraction';
 import {
@@ -293,16 +294,26 @@ export function initCommonDrawApp(app: IDrawApp) {
           //要移动到目标位的区段
           const sections = app.queryStore.queryByType<Section>(Section.Type);
           const minDistanceSection = sections.reduce((prev, cur) => {
-            return calculateDistanceFromPointToLine(
+            const prevDistance = calculateDistanceFromPointToLine(
               prev.localToCanvasPoint(prev.getStartPoint()),
               prev.localToCanvasPoint(prev.getEndPoint()),
               mousePos
-            ) >
-              calculateDistanceFromPointToLine(
-                cur.localToCanvasPoint(cur.getStartPoint()),
-                cur.localToCanvasPoint(cur.getEndPoint()),
-                mousePos
-              )
+            );
+            const curDistance = calculateDistanceFromPointToLine(
+              cur.localToCanvasPoint(cur.getStartPoint()),
+              cur.localToCanvasPoint(cur.getEndPoint()),
+              mousePos
+            );
+            return prevDistance > curDistance ||
+              (prevDistance == curDistance &&
+                distance2(
+                  prev.localToCanvasPoint(prev.getStartPoint()),
+                  mousePos
+                ) >
+                  distance2(
+                    cur.localToCanvasPoint(cur.getStartPoint()),
+                    mousePos
+                  ))
               ? cur
               : prev;
           });