!761 修复差集问题

src/DatabaseServices/Shape.ts

@@ -273,7 +273,6 @@ export class Shape
     //如果完全被减掉,就返回0个.其他的返回1个或者n个
     SubstactBoolOperation(targetShape: Shape): Shape[]
     {
-        let resOutlines = this._Outline.SubstactBoolOperation(targetShape._Outline);
         let shapes: Shape[] = [];
         //如果相减，则需要取出被减面域和减数面域的洞的交集，结果还需减去被减面域的全部孔洞
         targetShape._Holes.forEach(cu =>
@@ -283,8 +282,11 @@ export class Shape
             shapes.push(...Shape.pairHoleAndOutline(this.targetOutlineSubHoleOutline(tmpInterList, this._Holes)));
         });
 
-        let fCus = this.targetOutlineSubHoleOutline(resOutlines, Shape.mergeContours([...this._Holes, ...targetShape._Holes]));
-
+        let fCus: Contour[];
+        if (this.Holes.length > 0)
+            fCus = this.targetOutlineSubHoleOutline([this._Outline], Shape.mergeContours([targetShape._Outline, ...this._Holes]));
+        else
+            fCus = this._Outline.SubstactBoolOperation(targetShape._Outline);
         shapes.push(...Shape.pairHoleAndOutline(fCus));
         return shapes;
     }