[修正] 修正管线链接错误

src/app/working-area/working-area.component.ts

@@ -749,6 +749,7 @@ export class WorkingAreaComponent extends EventEmitter implements OnInit, AfterV
               } else {
                 this.paintingArrows.ready = true;
                 this.paintingArrows = null;
+                this.beginPaintPipeline();
               }
               break;
           }
@@ -944,7 +945,10 @@ export class WorkingAreaComponent extends EventEmitter implements OnInit, AfterV
   public paintingPipelineFinish(): void {
     if (this.paintMode === PaintMode.Pipeline) {
       this.paintMode = PaintMode.endPaint;
+      this.paintPoints.splice(0, this.paintPoints.length);
+      this.paintingPipeline = null;
     }
+    this.beginPaintingArrows();
   }
   public beginPaintingArrows(): void {
     this.paintMode = PaintMode.Arrows;