Q点位的连接

src/model/itemType/ToolboxLine.ts

@@ -59,6 +59,29 @@ export default class ToolboxLine extends Toolbox {
   }
 
   onMouseClicked(e: MouseEvent): THREE.Vector3 | undefined {
+
+    const point = this.lastMovePosition
+    // 如果正式的点命中到同类型的节点上，则不添加新的点，只牵线到该点
+    if (point) {
+      let catchPoint = null
+      const vv = this.itemType.pointArray.some(p => {
+        if (p.position.x === point.x && p.position.z === point.z) {
+          catchPoint = p
+          return true
+        }
+      })
+
+      if (vv && catchPoint) {
+        // 如果捕获到点，则将线条连接到该点
+        if (this.startPoint) {
+          this.afterAddPoint(this.startPoint, catchPoint)
+        }
+        this.tempLine && this.viewport.scene.remove(this.tempLine)
+        this.tempLine = undefined
+        return
+      }
+    }
+
     const r = super.onMouseClicked(e)
     if (!r) {
       return