修复:偏移算法错误

__test__/Polyline/offsetbug.test.ts

@@ -100,3 +100,12 @@ test("补圆弧错误02", () =>
 
 });
 
+test('方向判断错误', () =>
+{
+    let plD = { "file": [1, "Polyline", 8, 2, 100, false, 1, 1, 0, [0, 1, 0, 0, -1, 0, 0, 0, 0, 0, 1, 0, 905.8692798363977, -201.17289418446444, 0, 1], 0, 0, true, [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 46.0379459990736, -2.9086509590968035, 0, 1], 0, 2, 4, [339.450877196156, 791.6288697108841], 1.00000000428954, [336.55690134418086, 796.884809566722], 0.5932441531761995, [337.21656343856364, 602.2844235796431], 0.9999999957104566, [340.0748399325664, 607.5598624698049], -0.5932441531761995, true], "basePt": { "x": 108.6124401913877, "y": 77.99043062200967, "z": 0 } };
+    let f = new CADFiler(plD.file);
+    f.Read();
+    let pl = f.ReadObject() as Polyline;
+    let cus = pl.GetOffsetCurves(-6);
+    expect(cus.length).toBe(0);
+});

src/GraphicsSystem/OffsetPolyline.ts

@@ -681,7 +681,7 @@ export class OffsetPolyline
         {
             let c = this._SubCurves[i];
             let cp = c.GetClosestPointTo(pt, false);
-            if (equalv3(cp, pt)) return 0;
+            if (equalv3(cp, pt, 1e-5)) return 0;
 
             let dist = cp.distanceToSquared(pt);
             if (dist < minDist)