267 lines
7.8 KiB
TypeScript
267 lines
7.8 KiB
TypeScript
module es {
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/** 2d 向量 */
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export class Vector2 implements IEquatable<Vector2> {
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public x: number = 0;
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public y: number = 0;
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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 ? x : 0;
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this.y = y != undefined ? y : this.x;
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}
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public static get zero() {
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return new Vector2(0, 0);
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}
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public static get one() {
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return new Vector2(1, 1);
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}
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public static get unitX() {
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return new Vector2(1, 0);
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}
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public static get unitY() {
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return new Vector2(0, 1);
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}
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/**
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*
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* @param value1
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* @param value2
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*/
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public static add(value1: Vector2, value2: Vector2) {
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let result: Vector2 = Vector2.zero;
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result.x = value1.x + value2.x;
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result.y = value1.y + value2.y;
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return result;
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}
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/**
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*
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* @param value1
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* @param value2
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*/
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public static divide(value1: Vector2, value2: Vector2) {
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let result: Vector2 = Vector2.zero;
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result.x = value1.x / value2.x;
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result.y = value1.y / value2.y;
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return result;
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}
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/**
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*
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* @param value1
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* @param value2
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*/
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public static multiply(value1: Vector2, value2: Vector2) {
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let result: Vector2 = new Vector2(0, 0);
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result.x = value1.x * value2.x;
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result.y = value1.y * value2.y;
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return result;
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}
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/**
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*
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* @param value1
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* @param value2
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*/
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public static subtract(value1: Vector2, value2: Vector2) {
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let result: Vector2 = new Vector2(0, 0);
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result.x = value1.x - value2.x;
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result.y = value1.y - value2.y;
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return result;
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}
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/**
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* 创建一个新的Vector2
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* 它包含来自另一个向量的标准化值。
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* @param value
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*/
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public static normalize(value: Vector2) {
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let nValue = new Vector2(value.x, value.y);
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let val = 1 / Math.sqrt((nValue.x * nValue.x) + (nValue.y * nValue.y));
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nValue.x *= val;
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nValue.y *= val;
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return nValue;
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}
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/**
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* 返回两个向量的点积
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* @param value1
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* @param value2
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*/
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public static dot(value1: Vector2, value2: Vector2): number {
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return (value1.x * value2.x) + (value1.y * value2.y);
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}
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/**
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* 返回两个向量之间距离的平方
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* @param value1
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* @param value2
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*/
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public static distanceSquared(value1: Vector2, value2: Vector2) {
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let v1 = value1.x - value2.x, v2 = value1.y - value2.y;
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return (v1 * v1) + (v2 * v2);
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}
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/**
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* 将指定的值限制在一个范围内
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* @param value1
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* @param min
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* @param max
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*/
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public static clamp(value1: Vector2, min: Vector2, max: Vector2) {
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return new Vector2(MathHelper.clamp(value1.x, min.x, max.x),
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MathHelper.clamp(value1.y, min.y, max.y));
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}
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/**
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* 创建一个新的Vector2，其中包含指定向量的线性插值
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* @param value1 第一个向量
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* @param value2 第二个向量
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* @param amount 加权值(0.0-1.0之间)
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* @returns 指定向量的线性插值结果
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*/
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public static lerp(value1: Vector2, value2: Vector2, amount: number) {
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return new Vector2(MathHelper.lerp(value1.x, value2.x, amount), MathHelper.lerp(value1.y, value2.y, amount));
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}
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/**
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* 创建一个新的Vector2，该Vector2包含了通过指定的Matrix进行的二维向量变换。
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* @param position
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* @param matrix
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*/
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public static transform(position: Vector2, matrix: Matrix2D) {
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return new Vector2((position.x * matrix.m11) + (position.y * matrix.m21) + matrix.m31,
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(position.x * matrix.m12) + (position.y * matrix.m22) + matrix.m32);
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}
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/**
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* 返回两个向量之间的距离
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* @param value1
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* @param value2
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* @returns 两个向量之间的距离
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*/
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public static distance(value1: Vector2, value2: Vector2): number {
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let v1 = value1.x - value2.x, v2 = value1.y - value2.y;
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return Math.sqrt((v1 * v1) + (v2 * v2));
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}
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/**
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* 返回两个向量之间的角度，单位是度数
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* @param from
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* @param to
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*/
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public static angle(from: Vector2, to: Vector2): number{
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from = Vector2.normalize(from);
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to = Vector2.normalize(to);
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return Math.acos(MathHelper.clamp(Vector2.dot(from, to), -1, 1)) * MathHelper.Rad2Deg;
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}
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/**
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* 创建一个包含指定向量反转的新Vector2
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* @param value
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* @returns 矢量反演的结果
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*/
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public static negate(value: Vector2) {
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value.x = -value.x;
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value.y = -value.y;
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return value;
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}
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/**
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*
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* @param value
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*/
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public add(value: Vector2): Vector2 {
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this.x += value.x;
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this.y += value.y;
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return this;
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}
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/**
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*
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* @param value
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*/
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public divide(value: Vector2): Vector2 {
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this.x /= value.x;
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this.y /= value.y;
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return this;
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}
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/**
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*
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* @param value
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*/
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public multiply(value: Vector2): Vector2 {
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this.x *= value.x;
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this.y *= value.y;
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return this;
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}
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/**
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* 从当前Vector2减去一个Vector2
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* @param value 要减去的Vector2
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* @returns 当前Vector2
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*/
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public subtract(value: Vector2) {
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this.x -= value.x;
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this.y -= value.y;
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return this;
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}
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/**
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* 将这个Vector2变成一个方向相同的单位向量
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*/
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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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/** 返回它的长度 */
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public length() {
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return Math.sqrt((this.x * this.x) + (this.y * this.y));
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}
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/**
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* 返回该Vector2的平方长度
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* @returns 这个Vector2的平方长度
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*/
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public lengthSquared(): number {
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return (this.x * this.x) + (this.y * this.y);
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}
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/**
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* 四舍五入X和Y值
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*/
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public round(): Vector2 {
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return new Vector2(Math.round(this.x), Math.round(this.y));
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}
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/**
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* 比较当前实例是否等于指定的对象
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* @param other 要比较的对象
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* @returns 如果实例相同true 否则false
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*/
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public equals(other: Vector2 | object): boolean {
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if (other instanceof Vector2){
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return other.x == this.x && other.y == this.y;
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}
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return false;
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}
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public clone(): Vector2 {
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return new Vector2(this.x, this.y);
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}
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}
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}
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