补充偏移的单元测试

__test__/Polyline/__snapshots__/offset.test.ts.snap

@@ -199,6 +199,22 @@ Array [
 ]
 `;
 
+exports[`圆求交错误导致的线丢失 1`] = `4148.643109243218`;
+
+exports[`圆求交错误导致的线丢失 2`] = `4425.268216257021`;
+
+exports[`圆求交错误导致的线丢失 3`] = `4021.8883370297244`;
+
+exports[`圆求交错误导致的线丢失 4`] = `4581.211434067452`;
+
+exports[`圆求交错误导致的线丢失 5`] = `3900.596094685299`;
+
+exports[`圆求交错误导致的线丢失 6`] = `4757.455448859379`;
+
+exports[`圆求交错误导致的线丢失 7`] = `3783.7370117939813`;
+
+exports[`圆求交错误导致的线丢失 8`] = `4971.999047743294`;
+
 exports[`拱门偏移 1`] = `
 Array [
   1,

__test__/Polyline/offset.test.ts

@@ -814,3 +814,25 @@ test('简单图形因为点在线内算法错误导致的丢失', () =>
         expect(cus[0].Length).toMatchSnapshot();
     }
 });
+
+test('圆求交错误导致的线丢失', () =>
+{
+    let f = new CADFile();
+    f.Data =
+        [1, ["Polyline", 1, 1, 1077, false, 7, -1, [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1], 2, 8, [245.62964413684085, 1116.1391538309313], -0.6953179171905909, [357.14209871457234, 1741.1251588427203], -0.6821635222887411, [892.2042303620135, 1596.040230558597], 0.37526047823909664, [1317.3934365017694, 1221.2756098839004], 0.14384173346393453, [1715.0964405621776, 1096.7424042631346], 0.026448384140957723, [1793.2064027435729, 1099.4889679050386], -0.1912121824403452, [733.4339688924879, 1000.3133228797258], -0.3304377553967397, [245.62964413684108, 1116.139153830931], 0, false]]
+
+    f.Read();
+    let pl = f.ReadObject() as Polyline;
+
+    for (let d of [10, 20, 30, 40])
+    {
+        let cus = pl.GetOffsetCurves(d);
+
+        expect(cus.length).toBe(1);
+        expect(cus[0].Length).toMatchSnapshot();
+
+        cus = pl.GetOffsetCurves(-d);
+        expect(cus.length).toBe(1);
+        expect(cus[0].Length).toMatchSnapshot();
+    }
+});