添加注释

src/GraphicsSystem/OffestPolyline.ts

@@ -114,7 +114,9 @@ export class PolyOffestUtil
         }
         let newPlList: Array<Polyline> = [];
         let startV = this.clonePlData(offResList[0].pl.LineData[0]);
-        let isStillClose = this.m_Polyline.IsClose;
+
+        //判断是否起始或者终止线是否发生变化
+        let isChangeOriginClose = this.m_Polyline.IsClose;
 
         //直线获得斜率,圆弧获得圆弧方向
         const getSlope = (pl: Polyline) =>
@@ -145,11 +147,14 @@ export class PolyOffestUtil
 
             if (i === offResList.length - 1)
             {
-                if (this.m_Polyline.IsClose && isStillClose)
+                if (this.m_Polyline.IsClose && isChangeOriginClose)
                     laterLine = newPlList[0];
                 else
                 {
                     let frontLine = offResList[offResList.length - 1].pl;
+
+                    let oldSlope = getSlope(frontLine);
+
                     let endV = this.clonePlData(frontLine.LineData[1]);
                     //如果原先不是闭合的,判断偏移后首尾是否相交,相交则连接
                     if (offResList.length >= 3)
@@ -167,13 +172,15 @@ export class PolyOffestUtil
                         }
                     }
                     let pl = new Polyline([startV, endV]);
-                    let par = frontLine.GetParamAtPoint(Vec2DTo3D(endV.pt));
-                    let par1 = frontLine.GetParamAtPoint(Vec2DTo3D(startV.pt));
-                    par > 0 && par1 < 1 && newPlList.push(pl);
+                    let newSlope = getSlope(pl);
+
+                    !isDisVail(oldSlope, newSlope) && newPlList.push(pl);
                     break;
                 }
             }
+
             if (!laterLine) return [];
+
             //终点data
             let endV = i === offResList.length - 1 ? laterLine.LineData[0] : this.clonePlData(laterLine.LineData[0]);
             //交点
@@ -260,9 +267,9 @@ export class PolyOffestUtil
 
             if (equal(pl.StartPoint, pl.EndPoint) || isDisVail(oldSlope, newSlope))
             {
-                if (isStillClose)
+                if (isChangeOriginClose)
                 {
-                    isStillClose = !(offResList[i].index === 0 || offResList[i].index === this.m_Polyline.EndParam);
+                    isChangeOriginClose = !(offResList[i].index === 0 || offResList[i].index === this.m_Polyline.EndParam);
                 }
                 continue;
             }