开发:绘制线移除不需要的代码,优化更新逻辑

src/Add-on/DrawLine.ts

@@ -85,7 +85,6 @@ export class DrawLine implements Command
         let ptLast = ptRes.Point;
         let firstSnapModeIsTan = ptRes.SnapMode === ObjectSnapMode.Tan && ptRes.SnapEntity;
         let firstTangeCircle = ptRes.SnapEntity as Circle;
-        let secondSnapModelIsTan = false;
 
         const TempUndo = () =>
         {
@@ -101,13 +100,13 @@ export class DrawLine implements Command
         while (true)
         {
             let line = new Line(ptLast.clone());
-            if ((pts.length === 1 && firstSnapModeIsTan) || secondSnapModelIsTan)
+            if (pts.length === 1 && firstSnapModeIsTan)
                 JigUtils.Draw(line);//我们用这个来代替橡皮筋
 
             const UpdateEndPt = (p: Vector3, i, snapMode: ObjectSnapMode) =>
             {
                 //第一个是圆切点时,实时更新切点
-                if ((pts.length === 1 && firstSnapModeIsTan) && snapMode !== ObjectSnapMode.Tan)
+                if (pts.length === 1 && firstSnapModeIsTan)
                 {
                     const cirCenter = firstTangeCircle.Center;
                     let circlePointFirst = p.clone().sub(cirCenter);
@@ -130,7 +129,7 @@ export class DrawLine implements Command
             ptRes = await app.Editor.GetPoint({
                 Msg: "请输入点2:",
                 BasePoint: ptLast,
-                AllowDrawRubberBand: !((pts.length === 1 && firstSnapModeIsTan) || secondSnapModelIsTan),
+                AllowDrawRubberBand: !(pts.length === 1 && firstSnapModeIsTan),
                 AllowNone: true,
                 SupportSnapPoints: pts,
                 KeyWordList: [