SelectInspect 选择工具

src/designer/model2DEditor/tools/SelectInspect.ts

@@ -6,30 +6,63 @@ import { Line2 } from 'three/examples/jsm/lines/Line2.js'
 import { LineGeometry } from 'three/examples/jsm/lines/LineGeometry.js'
 import { LineMaterial } from 'three/examples/jsm/lines/LineMaterial.js'
 
+let pdFn, pmFn, puFn
+
 /**
  * 选择工具，用于在设计器中显示选中对象的包围盒
  */
 export default class SelectInspect implements ITool {
-  viewport: any
+  viewport: Viewport
-  material: LineMaterial
+  /**
+   * 线框材质，用于显示选中对象的包围盒
+   */
+  material: LineMaterial = new LineMaterial({ color: 0xffff00, linewidth: 2 })
+
+  /**
+   * 矩形材质，用于显示鼠标拖拽选择的矩形区域
+   */
+  rectMaterial: THREE.MeshBasicMaterial = new THREE.MeshBasicMaterial({
+    color: 0x000000,
+    opacity: 0.5,
+    transparent: true
+  })
+
+  /**
+   * 当前选中对象的矩形选择框
+   */
+  rectangle: THREE.Mesh | null = null
+
+  /**
+   * 当前选中对象的包围盒线框
+   */
   selectionBox: Line2
 
+  /**
+   * 当前鼠标所在的画布, 对应 viewport.renderer.domElement
+   */
+  canvas: HTMLCanvasElement
+
+  /**
+   * 鼠标按下时记录的起始位置，用于绘制矩形选择框
+   */
+  recStartPos: THREE.Vector3 | null
+
   constructor() {
-    // 颜色变成黄
-    const color = 0xffff00  // 0xff0000
-    const lineWidth = 2
-    this.material = new LineMaterial({ color, linewidth: lineWidth })
   }
 
   init(viewport: Viewport) {
     this.viewport = viewport
+    this.canvas = this.viewport.renderer.domElement as HTMLCanvasElement
+
+    pdFn = this.onMouseDown.bind(this)
+    this.canvas.addEventListener('pointerdown', pdFn)
+    pmFn = this.onMouseMove.bind(this)
+    this.canvas.addEventListener('pointermove', pmFn)
+    puFn = this.onMouseUp.bind(this)
+    this.canvas.addEventListener('pointerup', puFn)
 
     this.viewport.watchList.push(watch(() => this.viewport.state.selectedObject, (selectedObject) => {
-      if (this.selectionBox) {
+      this.disposeSelectionBox()
-        viewport.scene.remove(this.selectionBox)
-        this.selectionBox.geometry.dispose()
-        this.selectionBox = null
-      }
 
       const expandAmount = 0.2 // 扩展包围盒的大小
       if (selectedObject !== null) {
@@ -66,11 +99,97 @@ export default class SelectInspect implements ITool {
   }
 
   destory() {
+
+    this.canvas.removeEventListener('pointerdown', pdFn)
+    pdFn = undefined
+    this.canvas.removeEventListener('pointermove', pmFn)
+    pmFn = undefined
+    this.canvas.removeEventListener('pointerup', puFn)
+    puFn = undefined
+
     // 销毁选择工具
+    this.disposeSelectionBox()
+    this.disposeRect()
+  }
+
+  disposeSelectionBox() {
     if (this.selectionBox) {
       this.viewport.scene.remove(this.selectionBox)
       this.selectionBox.geometry.dispose()
       this.selectionBox = null
     }
   }
-}
+
+  createRectangle() {
+    if (this.rectangle !== null) {
+      this.disposeRect()
+    }
+    if (this.recStartPos) {
+      // 创建矩形
+      this.rectangle = new THREE.Mesh(
+        new THREE.PlaneGeometry(1, 1),
+        this.rectMaterial
+      )
+      this.rectangle.name = 'selectRectangle'
+      this.rectangle.rotation.x = -Math.PI / 2 // 关键！让平面正对相机
+      this.rectangle.position.set(
+        this.recStartPos.x,
+        this.recStartPos.y,
+        this.recStartPos.z
+      )
+      this.viewport.scene.add(this.rectangle)
+    }
+  }
+
+  updateRectangle(position: THREE.Vector3) {
+    if (!this.rectangle || !this.recStartPos) return
+    // console.log('updateRectangle', this.recStartPos, position)
+
+    const width = position.x - this.recStartPos.x
+    const height = position.z - this.recStartPos.z
+
+    const newWidth = Math.abs(width)
+    const newHeight = Math.abs(height)
+
+    // 清理旧几何体
+    this.rectangle.geometry.dispose()
+    this.rectangle.geometry = new THREE.PlaneGeometry(newWidth, newHeight)
+    this.rectangle.position.set(
+      this.recStartPos.x + width / 2,
+      this.recStartPos.y,
+      this.recStartPos.z + height / 2
+    )
+  }
+
+  onMouseDown(event: MouseEvent) {
+    if (event.shiftKey) {
+      // 记录鼠标按下位置
+      this.recStartPos = this.viewport.getClosestIntersection(event)
+      this.createRectangle()
+    }
+  }
+
+
+  onMouseMove(event: MouseEvent) {
+    if (!this.recStartPos) {
+      this.disposeRect()
+    }
+    // 更新矩形大小或重新生成矩形
+    const position = this.viewport.getClosestIntersection(event)
+    if (!position) return
+    this.updateRectangle(position)
+  }
+
+  disposeRect() {
+    if (this.rectangle !== null) {
+      this.viewport.scene.remove(this.rectangle)
+      this.rectangle.geometry.dispose()
+      this.rectangle = null
+    }
+    this.recStartPos = null
+  }
+
+  onMouseUp(event: MouseEvent) {
+    this.disposeRect()
+  }
+}