补圆弧时交点需要大于偏移距离允许提前连接,轮廓加入顶点圆

__test__/Polyline/offset.test.ts

@@ -69,6 +69,7 @@ describe("闭合多段线", () =>
         }
         for (let i = -1.5; i < 0; i += 0.01)
         {
+            if (cus[0].GetOffsetCurves(i).length === 0) console.log(i);
             expect(cus[0].GetOffsetCurves(i).length).toBe(1);
         }
         for (let i = 2; i < 10; i += 1)

src/GraphicsSystem/OffestPolyline.ts

@@ -1,6 +1,6 @@
 import { Box3, Vector3 } from "three";
 import { arrayLast, arrayRemoveIf, arraySortByNumber } from "../Common/ArrayExt";
-import { curveLinkGroup, GetPointAtCurveDir } from "../Common/CurveUtils";
+import { curveLinkGroup, GetPointAtCurveDir, Vec2DTo3D } from "../Common/CurveUtils";
 import { FixIndex } from "../Common/Utils";
 import { Arc } from "../DatabaseServices/Arc";
 import { Circle } from "../DatabaseServices/Circle";
@@ -42,16 +42,20 @@ export class PolyOffestUtil
         let expCus = this.m_Polyline.Explode();
         let offres = this.OffestCurve(expCus, this.m_OffestDist);
 
-        //暂只传入首尾点的圆做轮廓
+
-        if (!this.m_Polyline.IsClose)
-        {
-            let cir1 = new Circle(this.m_Polyline.StartPoint, this.m_AbsDist);
-            let cir2 = new Circle(this.m_Polyline.EndPoint, this.m_AbsDist);
-            this.m_Contours.push(Contour.CreateContour([cir1]));
-            this.m_Contours.push(Contour.CreateContour([cir2]));
-        }
         // console.time("join")
         this.TrimAndBuildContour(offres);
+
+        for (let i = 0, count = this.m_Polyline.EndParam; i < count; i++)
+        {
+            if (i === count && this.m_Polyline.IsClose)
+            {
+                break;
+            }
+            let center = Vec2DTo3D(this.m_Polyline.GetPoint2dAt(i)).applyMatrix4(this.m_Polyline.OCS);
+            let cir = new Circle(center, this.m_AbsDist);
+            this.m_Contours.push(Contour.CreateContour([cir]));
+        }
         // testContours(this.m_Contours);
         // console.timeEnd("join")
         //裁剪
@@ -231,7 +235,6 @@ export class PolyOffestUtil
 
         //下一线段起始点
         let nextStartPt: Vector3 = offResList[0].curve.StartPoint;
-        let cirContours: Contour[] = []
         for (let i = 0; i < offResList.length; i++)
         {
             //源线段对应索引
@@ -257,15 +260,10 @@ export class PolyOffestUtil
             let isFillArc = FixIndex(startIndex + 1, this.m_Polyline.EndParam) !== endIndex;
 
             //丢失圆弧时在丢失圆弧的起点构造一个圆
-            if (isFillArc)
+            if (isFillArc && startIndex > endIndex)
             {
-                let cir = new Circle(this.m_Polyline.GetPointAtParam(startIndex + 1), this.m_AbsDist);
+                this.fillArc(startIndex, endIndex, nextStartPt, frontLine, laterLine);
-                cirContours.push(Contour.CreateContour([cir]));
+                continue;
-                if (startIndex > endIndex)
-                {
-                    this.fillArc(startIndex, endIndex, nextStartPt, frontLine, laterLine);
-                    continue;
-                }
             }
             //#endregion
 
@@ -311,7 +309,6 @@ export class PolyOffestUtil
                 this.m_Polyline.GetCurveAtParam(offResList[0].index),
                 this.m_RetCurves[0]);
         };
-        this.m_Contours.push(...cirContours);
     }
 
     /**
@@ -469,7 +466,14 @@ export class PolyOffestUtil
             if (index === cirs.length - 1)
                 iPtsLater = [laterLine.StartPoint];
             else
-                iPtsLater = c1.IntersectWith(laterLine, 0);
+            {
+                //和前面圆的交点需要大于偏移距离才能提前相交
+                iPtsLater = c1.IntersectWith(laterLine, 0).filter(p =>
+                {
+                    let dist = p.distanceToSquared(this.m_Polyline.GetClosestPointTo(p, false));
+                    return dist + 1e-3 > this.m_dist2;
+                });
+            }
 
             if (iPtsLater.length > 0)//直接和最后一条连接
             {
@@ -537,7 +541,7 @@ export class PolyOffestUtil
                 return;
 
             this.m_RetCurves.push(cu);
-            this.m_Contours.push(this.BuildContour(cu));
+            // this.m_Contours.push(this.BuildContour(cu));
         }
     }
     // 通过构建的轮廓对偏移曲线进行裁剪