添加 左键移动旋转相机的选项.

src/Editor/CameraControls.ts

@@ -1,3 +1,4 @@
+import { boolean } from 'mobx-state-tree/dist/types/primitives';
 //相机控制
 import * as THREE from 'three';
 import { Viewer } from '../GraphicsSystem/Viewer';
@@ -38,6 +39,8 @@ export class CameraControls
     //状态
     m_State: CameraControlState = CameraControlState.Null;
     m_Viewer: Viewer;
+    //左键使用旋转
+    m_LeftUseRotate: boolean = false;
 
     constructor(viewer: Viewer)
     {
@@ -138,7 +141,11 @@ export class CameraControls
         this.m_StartChickPoint.copy(this.m_EndChickPoint);
         this.m_Viewer.m_bNeedUpdate = true;
     }
-
+    beginRotate()
+    {
+        this.m_State = CameraControlState.Rotate;
+        this.m_Viewer.UpdateLockTarget();
+    }
     //鼠标    
     onMouseDown = (event: MouseEvent) =>
     {
@@ -151,14 +158,17 @@ export class CameraControls
         {
             case MouseKey.Left:
                 {
+                    if (this.m_LeftUseRotate)
+                    {
+                        this.beginRotate();
+                    }
                     break;
                 }
             case MouseKey.Middle:
                 {
                     if (this.m_KeyDown.get("Alt"))
                     {
-                        this.m_State = CameraControlState.Rotate;
-                        this.m_Viewer.UpdateLockTarget();
+                        this.beginRotate();
                     }
                     else
                     {
@@ -187,7 +197,12 @@ export class CameraControls
         changeVec.subVectors(this.m_EndChickPoint, this.m_StartChickPoint);
         this.m_StartChickPoint.copy(this.m_EndChickPoint);
 
-        if (this.m_KeyDown.get("Alt") && this.m_State == CameraControlState.Rotate)
+        if (
+            (this.m_LeftUseRotate ||
+                (this.m_KeyDown.get("Alt"))
+            )
+            && this.m_State == CameraControlState.Rotate
+        )
         {
             this.m_Viewer.Rotate(changeVec);
         }