46 lines
1.1 KiB
TypeScript
46 lines
1.1 KiB
TypeScript
/** 2d 向量 */
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class Vector2 {
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public x: number;
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public y: number;
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/**
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* 从两个值构造一个带有X和Y的二维向量。
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* @param x 二维空间中的x坐标
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* @param y 二维空间的y坐标
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*/
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constructor(x: number, y: number){
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this.x = x;
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this.y = y;
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}
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public static add(value1: Vector2, value2: Vector2){
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value1.x += value2.x;
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value1.y += value2.y;
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return value1;
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}
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public static divide(value1: Vector2, value2: Vector2){
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value1.x /= value2.x;
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value1.y /= value2.y;
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return value1;
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}
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public static multiply(value1: Vector2, value2: Vector2){
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value1.x *= value2.x;
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value1.y *= value2.y;
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return value1;
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}
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public static subtract(value1: Vector2, value2: Vector2){
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value1.x -= value2.x;
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value1.y -= value2.y;
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return value1;
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}
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/** 变成一个方向相同的单位向量 */
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public normalize(){
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let val = 1 / Math.sqrt((this.x * this.x) + (this.y * this.y));
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this.x *= val;
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this.y *= val;
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}
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} |