优化collision

source/src/Math/MathHelper.ts

@@ -27,6 +27,10 @@ class MathHelper {
         return rightMin + (value - leftMin) * (rightMax - rightMin) / (leftMax - leftMin);
     }
 
+    public static lerp(value1: number, value2: number, amount: number){
+        return value1 + (value2 - value1) * amount;
+    }
+
     public static clamp(value: number, min: number, max: number){
         if (value < min)
             return min;

source/src/Math/Vector2.ts

@@ -8,9 +8,9 @@ class Vector2 {
      * @param x 二维空间中的x坐标
      * @param y 二维空间的y坐标
      */
-    constructor(x: number, y: number){
+    constructor(x: number, y?: number){
         this.x = x;
-        this.y = y;
+        this.y = y ? y : x;
     }
 
     public static add(value1: Vector2, value2: Vector2){
@@ -78,6 +78,10 @@ class Vector2 {
         return (v1 * v1) + (v2 * v2);
     }
 
+    public static lerp(value1: Vector2, value2: Vector2, amount: number){
+        return new Vector2(MathHelper.lerp(value1.x, value2.x, amount), MathHelper.lerp(value1.y, value2.y, amount));
+    }
+
     public static transform(position: Vector2, matrix: Matrix2D){
         return new Vector2((position.x * matrix.m11) + (position.y * matrix.m21), (position.x * matrix.m12) + (position.y * matrix.m22));
     }