添加曲线需要实现的方法.

src/DatabaseServices/Curve.ts

@@ -23,7 +23,11 @@ export abstract class Curve extends Entity
     get EndPoint(): Vector3 { return; }
     get EndParam(): number { return; }
     get Area(): number { return; }
+    //获得曲线的面积,逆时针为正,顺时针为负.
+    get Area2(): number { return; }
     get IsClose(): boolean { return; }
+    //曲线为顺时针
+    get IsClockWise(): boolean { return this.Area2 < 0; }
 
     GetPointAtParam(param: number): Vector3 { return; }
     GetPointAtDistance(distance: number): Vector3 { return; }