修复bug

src/view/case/draw/board/editCAD/Controls/UIControl.js

@@ -442,6 +442,7 @@ export default class UIControl {
     coordinate.setRatio(3)
     canvas.width = canvas.width * coordinate.ratio
     canvas.height = canvas.height * coordinate.ratio
+    stateService.clearItems();
     this.layer.renderer.autoRedrawForImg()
     setTimeout(() => {
       // let blobImg = this.downloadCadImg(canvas, filename)