修正对空线段补圆弧的问题,修正错误的精简代码

src/GraphicsSystem/OffsetPolyline.ts

@@ -318,7 +318,10 @@ export class PolyOffsetUtil
 
 
             //#region 1.中间丢失线段的情况下且循环到尾部,补圆弧.
-            let isFillArc = FixIndex(startIndex + 1, this.m_PtCount) !== endIndex;
+            let isFillArc = !equal(
+                this.m_Polyline.GetPoint2dAt(FixIndex(startIndex + 1, this.m_PtCount)),
+                this.m_Polyline.GetPoint2dAt(endIndex)
+            );
 
             if (isFillArc)
             {
@@ -507,7 +510,8 @@ export class PolyOffsetUtil
 
         //找到和frontline存在离源线段距离大于偏移距离的交点的圆,跳过这个圆前面的圆计算
         let iPts: Vector3[];
-        for (let index = 1; index < cirs.length; index++)
+        let index = 1;
+        for (; index < cirs.length; index++)
         {
             let pts = frontLine.IntersectWith(cirs[index], 0).filter(p =>
             {
@@ -516,13 +520,14 @@ export class PolyOffsetUtil
             });
             if (pts.length === 0)
             {
-                cirs.splice(0, index - 1);
                 break;
             }
             else
                 iPts = pts;
         }
-        if (!iPts)
+        if (iPts)
+            cirs.splice(0, index - 1);
+        else
             iPts = [frontLine.EndPoint];
 
         let iPt = this.selectFitInterPt(iPts, frontLine.EndPoint);