fix: 优化指示器位置更新逻辑，支持原生事件坐标转换

src/component/Canvas/CanvasEditor/managers/BrushIndicator.js

@@ -97,7 +97,8 @@ export class BrushIndicator {
     if (!this.staticCanvas || !this.canvas) return;
 
     // 检查是否为笔刷或橡皮擦模式，非相关模式直接返回
-    const isBrushMode = this.canvas.isDrawingMode && this.canvas.freeDrawingBrush;
+    const isBrushMode =
+      this.canvas.isDrawingMode && this.canvas.freeDrawingBrush;
     const isEraserMode =
       this.canvas.isDrawingMode &&
       this.canvas.freeDrawingBrush &&
@@ -135,7 +136,10 @@ export class BrushIndicator {
     const currentVpt = this.canvas.viewportTransform;
     if (
       currentVpt &&
-      !this._areViewportTransformsEqual(currentVpt, this._lastCanvasState.viewportTransform)
+      !this._areViewportTransformsEqual(
+        currentVpt,
+        this._lastCanvasState.viewportTransform
+      )
     ) {
       this.staticCanvas.setViewportTransform([...currentVpt]);
       this._lastCanvasState.viewportTransform = [...currentVpt];
@@ -313,8 +317,26 @@ export class BrushIndicator {
   updatePosition(pointer) {
     if (!this.isVisible || !this.indicatorCircle) return;
 
-    // 使用主画布的坐标转换
-    const canvasPointer = this.canvas.getPointer(pointer);
+    let canvasPointer;
+    // 如果是原生事件（如 e.e），优先用 clientX/clientY 转换
+    if (
+      pointer &&
+      pointer.clientX !== undefined &&
+      pointer.clientY !== undefined
+    ) {
+      // 获取主画布的包裹元素位置
+      const rect = this.canvas.upperCanvasEl.getBoundingClientRect();
+      const x = pointer.clientX - rect.left;
+      const y = pointer.clientY - rect.top;
+      // 逆变换到画布坐标
+      canvasPointer = fabric.util.transformPoint(
+        new fabric.Point(x, y),
+        fabric.util.invertTransform(this.canvas.viewportTransform)
+      );
+    } else {
+      // 兼容 fabric 的 getPointer
+      canvasPointer = this.canvas.getPointer(pointer);
+    }
 
     // 更新当前位置
     this.currentPosition = {
@@ -328,8 +350,6 @@ export class BrushIndicator {
       top: canvasPointer.y,
     });
 
-    // 重新渲染静态画布
-    // this.staticCanvas.renderAll();
     // 优化渲染
     this.staticCanvas.requestRenderAll();
   }