新增math库

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YHH
2025-08-10 16:00:02 +08:00
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import { Vector2 } from './Vector2';
/**
* 3x3变换矩阵类
*
* 用于2D变换平移、旋转、缩放的3x3矩阵
* 矩阵布局:
* [m00, m01, m02] [scaleX * cos, -scaleY * sin, translateX]
* [m10, m11, m12] = [scaleX * sin, scaleY * cos, translateY]
* [m20, m21, m22] [0, 0, 1]
*/
export class Matrix3 {
/** 矩阵元素,按行优先存储 */
public elements: Float32Array;
/**
* 创建3x3矩阵
* @param elements 矩阵元素数组(可选),默认为单位矩阵
*/
constructor(elements?: ArrayLike<number>) {
this.elements = new Float32Array(9);
if (elements) {
this.elements.set(elements);
} else {
this.identity();
}
}
// 静态常量
/** 单位矩阵 */
static readonly IDENTITY = new Matrix3([
1, 0, 0,
0, 1, 0,
0, 0, 1
]);
/** 零矩阵 */
static readonly ZERO = new Matrix3([
0, 0, 0,
0, 0, 0,
0, 0, 0
]);
// 元素访问器
/** 获取矩阵元素 */
get(row: number, col: number): number {
return this.elements[row * 3 + col];
}
/** 设置矩阵元素 */
set(row: number, col: number, value: number): this {
this.elements[row * 3 + col] = value;
return this;
}
// 快速访问器
get m00(): number { return this.elements[0]; }
set m00(value: number) { this.elements[0] = value; }
get m01(): number { return this.elements[1]; }
set m01(value: number) { this.elements[1] = value; }
get m02(): number { return this.elements[2]; }
set m02(value: number) { this.elements[2] = value; }
get m10(): number { return this.elements[3]; }
set m10(value: number) { this.elements[3] = value; }
get m11(): number { return this.elements[4]; }
set m11(value: number) { this.elements[4] = value; }
get m12(): number { return this.elements[5]; }
set m12(value: number) { this.elements[5] = value; }
get m20(): number { return this.elements[6]; }
set m20(value: number) { this.elements[6] = value; }
get m21(): number { return this.elements[7]; }
set m21(value: number) { this.elements[7] = value; }
get m22(): number { return this.elements[8]; }
set m22(value: number) { this.elements[8] = value; }
// 基础操作
/**
* 设置矩阵为单位矩阵
* @returns 当前矩阵实例(链式调用)
*/
identity(): this {
this.elements.set([
1, 0, 0,
0, 1, 0,
0, 0, 1
]);
return this;
}
/**
* 设置矩阵为零矩阵
* @returns 当前矩阵实例(链式调用)
*/
zero(): this {
this.elements.fill(0);
return this;
}
/**
* 复制另一个矩阵的值
* @param other 源矩阵
* @returns 当前矩阵实例(链式调用)
*/
copy(other: Matrix3): this {
this.elements.set(other.elements);
return this;
}
/**
* 克隆当前矩阵
* @returns 新的矩阵实例
*/
clone(): Matrix3 {
return new Matrix3(this.elements);
}
/**
* 从数组设置矩阵元素
* @param elements 矩阵元素数组
* @returns 当前矩阵实例(链式调用)
*/
fromArray(elements: ArrayLike<number>): this {
this.elements.set(elements);
return this;
}
// 矩阵运算
/**
* 矩阵加法
* @param other 另一个矩阵
* @returns 当前矩阵实例(链式调用)
*/
add(other: Matrix3): this {
for (let i = 0; i < 9; i++) {
this.elements[i] += other.elements[i];
}
return this;
}
/**
* 矩阵减法
* @param other 另一个矩阵
* @returns 当前矩阵实例(链式调用)
*/
subtract(other: Matrix3): this {
for (let i = 0; i < 9; i++) {
this.elements[i] -= other.elements[i];
}
return this;
}
/**
* 矩阵标量乘法
* @param scalar 标量
* @returns 当前矩阵实例(链式调用)
*/
multiplyScalar(scalar: number): this {
for (let i = 0; i < 9; i++) {
this.elements[i] *= scalar;
}
return this;
}
/**
* 矩阵乘法
* @param other 另一个矩阵
* @returns 当前矩阵实例(链式调用)
*/
multiply(other: Matrix3): this {
const a = this.elements;
const b = other.elements;
const result = new Float32Array(9);
result[0] = a[0] * b[0] + a[1] * b[3] + a[2] * b[6];
result[1] = a[0] * b[1] + a[1] * b[4] + a[2] * b[7];
result[2] = a[0] * b[2] + a[1] * b[5] + a[2] * b[8];
result[3] = a[3] * b[0] + a[4] * b[3] + a[5] * b[6];
result[4] = a[3] * b[1] + a[4] * b[4] + a[5] * b[7];
result[5] = a[3] * b[2] + a[4] * b[5] + a[5] * b[8];
result[6] = a[6] * b[0] + a[7] * b[3] + a[8] * b[6];
result[7] = a[6] * b[1] + a[7] * b[4] + a[8] * b[7];
result[8] = a[6] * b[2] + a[7] * b[5] + a[8] * b[8];
this.elements.set(result);
return this;
}
/**
* 左乘另一个矩阵other * this
* @param other 左乘矩阵
* @returns 当前矩阵实例(链式调用)
*/
premultiply(other: Matrix3): this {
const a = other.elements;
const b = this.elements;
const result = new Float32Array(9);
result[0] = a[0] * b[0] + a[1] * b[3] + a[2] * b[6];
result[1] = a[0] * b[1] + a[1] * b[4] + a[2] * b[7];
result[2] = a[0] * b[2] + a[1] * b[5] + a[2] * b[8];
result[3] = a[3] * b[0] + a[4] * b[3] + a[5] * b[6];
result[4] = a[3] * b[1] + a[4] * b[4] + a[5] * b[7];
result[5] = a[3] * b[2] + a[4] * b[5] + a[5] * b[8];
result[6] = a[6] * b[0] + a[7] * b[3] + a[8] * b[6];
result[7] = a[6] * b[1] + a[7] * b[4] + a[8] * b[7];
result[8] = a[6] * b[2] + a[7] * b[5] + a[8] * b[8];
this.elements.set(result);
return this;
}
// 变换操作
/**
* 设置为平移矩阵
* @param x X方向平移
* @param y Y方向平移
* @returns 当前矩阵实例(链式调用)
*/
makeTranslation(x: number, y: number): this {
this.elements.set([
1, 0, x,
0, 1, y,
0, 0, 1
]);
return this;
}
/**
* 设置为旋转矩阵
* @param angle 旋转角度(弧度)
* @returns 当前矩阵实例(链式调用)
*/
makeRotation(angle: number): this {
const cos = Math.cos(angle);
const sin = Math.sin(angle);
this.elements.set([
cos, -sin, 0,
sin, cos, 0,
0, 0, 1
]);
return this;
}
/**
* 设置为缩放矩阵
* @param scaleX X方向缩放
* @param scaleY Y方向缩放
* @returns 当前矩阵实例(链式调用)
*/
makeScale(scaleX: number, scaleY: number): this {
this.elements.set([
scaleX, 0, 0,
0, scaleY, 0,
0, 0, 1
]);
return this;
}
/**
* 复合平移
* @param x X方向平移
* @param y Y方向平移
* @returns 当前矩阵实例(链式调用)
*/
translate(x: number, y: number): this {
this.m02 += this.m00 * x + this.m01 * y;
this.m12 += this.m10 * x + this.m11 * y;
return this;
}
/**
* 复合旋转
* @param angle 旋转角度(弧度)
* @returns 当前矩阵实例(链式调用)
*/
rotate(angle: number): this {
const cos = Math.cos(angle);
const sin = Math.sin(angle);
const m00 = this.m00 * cos + this.m01 * sin;
const m01 = this.m00 * -sin + this.m01 * cos;
const m10 = this.m10 * cos + this.m11 * sin;
const m11 = this.m10 * -sin + this.m11 * cos;
this.m00 = m00;
this.m01 = m01;
this.m10 = m10;
this.m11 = m11;
return this;
}
/**
* 复合缩放
* @param scaleX X方向缩放
* @param scaleY Y方向缩放
* @returns 当前矩阵实例(链式调用)
*/
scale(scaleX: number, scaleY: number): this {
this.m00 *= scaleX;
this.m01 *= scaleY;
this.m10 *= scaleX;
this.m11 *= scaleY;
return this;
}
// 矩阵变换
/**
* 矩阵转置
* @returns 当前矩阵实例(链式调用)
*/
transpose(): this {
const elements = this.elements;
let tmp: number;
tmp = elements[1]; elements[1] = elements[3]; elements[3] = tmp;
tmp = elements[2]; elements[2] = elements[6]; elements[6] = tmp;
tmp = elements[5]; elements[5] = elements[7]; elements[7] = tmp;
return this;
}
/**
* 计算矩阵行列式
* @returns 行列式值
*/
determinant(): number {
const e = this.elements;
return e[0] * (e[4] * e[8] - e[5] * e[7]) -
e[1] * (e[3] * e[8] - e[5] * e[6]) +
e[2] * (e[3] * e[7] - e[4] * e[6]);
}
/**
* 矩阵求逆
* @returns 当前矩阵实例(链式调用),如果矩阵不可逆则保持不变
*/
invert(): this {
const e = this.elements;
const det = this.determinant();
if (Math.abs(det) < Number.EPSILON) {
console.warn('Matrix3: 矩阵不可逆');
return this;
}
const invDet = 1 / det;
const result = new Float32Array(9);
result[0] = (e[4] * e[8] - e[5] * e[7]) * invDet;
result[1] = (e[2] * e[7] - e[1] * e[8]) * invDet;
result[2] = (e[1] * e[5] - e[2] * e[4]) * invDet;
result[3] = (e[5] * e[6] - e[3] * e[8]) * invDet;
result[4] = (e[0] * e[8] - e[2] * e[6]) * invDet;
result[5] = (e[2] * e[3] - e[0] * e[5]) * invDet;
result[6] = (e[3] * e[7] - e[4] * e[6]) * invDet;
result[7] = (e[1] * e[6] - e[0] * e[7]) * invDet;
result[8] = (e[0] * e[4] - e[1] * e[3]) * invDet;
this.elements.set(result);
return this;
}
// 向量变换
/**
* 变换向量应用完整的3x3变换
* @param vector 向量
* @returns 新的变换后的向量
*/
transformVector(vector: Vector2): Vector2 {
const x = vector.x;
const y = vector.y;
const w = this.m20 * x + this.m21 * y + this.m22;
return new Vector2(
(this.m00 * x + this.m01 * y + this.m02) / w,
(this.m10 * x + this.m11 * y + this.m12) / w
);
}
/**
* 变换向量(仅应用旋转和缩放,忽略平移)
* @param vector 向量
* @returns 新的变换后的向量
*/
transformDirection(vector: Vector2): Vector2 {
return new Vector2(
this.m00 * vector.x + this.m01 * vector.y,
this.m10 * vector.x + this.m11 * vector.y
);
}
/**
* 批量变换向量数组
* @param vectors 向量数组
* @returns 变换后的向量数组
*/
transformVectors(vectors: Vector2[]): Vector2[] {
return vectors.map(v => this.transformVector(v));
}
// 属性提取
/**
* 获取平移分量
* @returns 平移向量
*/
getTranslation(): Vector2 {
return new Vector2(this.m02, this.m12);
}
/**
* 获取旋转角度
* @returns 旋转角度(弧度)
*/
getRotation(): number {
return Math.atan2(this.m10, this.m00);
}
/**
* 获取缩放分量
* @returns 缩放向量
*/
getScale(): Vector2 {
const scaleX = Math.sqrt(this.m00 * this.m00 + this.m10 * this.m10);
const scaleY = Math.sqrt(this.m01 * this.m01 + this.m11 * this.m11);
// 检查是否有反转
const det = this.determinant();
if (det < 0) {
return new Vector2(-scaleX, scaleY);
}
return new Vector2(scaleX, scaleY);
}
/**
* 分解变换矩阵为平移、旋转、缩放分量
* @returns {translation, rotation, scale}
*/
decompose(): { translation: Vector2; rotation: number; scale: Vector2 } {
return {
translation: this.getTranslation(),
rotation: this.getRotation(),
scale: this.getScale()
};
}
// 比较操作
/**
* 检查两个矩阵是否相等
* @param other 另一个矩阵
* @param epsilon 容差默认为Number.EPSILON
* @returns 是否相等
*/
equals(other: Matrix3, epsilon: number = Number.EPSILON): boolean {
for (let i = 0; i < 9; i++) {
if (Math.abs(this.elements[i] - other.elements[i]) >= epsilon) {
return false;
}
}
return true;
}
/**
* 检查两个矩阵是否完全相等
* @param other 另一个矩阵
* @returns 是否完全相等
*/
exactEquals(other: Matrix3): boolean {
for (let i = 0; i < 9; i++) {
if (this.elements[i] !== other.elements[i]) {
return false;
}
}
return true;
}
/**
* 检查是否为单位矩阵
* @param epsilon 容差默认为Number.EPSILON
* @returns 是否为单位矩阵
*/
isIdentity(epsilon: number = Number.EPSILON): boolean {
return this.equals(Matrix3.IDENTITY, epsilon);
}
// 静态方法
/**
* 矩阵乘法(静态方法)
* @param a 矩阵a
* @param b 矩阵b
* @returns 新的结果矩阵
*/
static multiply(a: Matrix3, b: Matrix3): Matrix3 {
return a.clone().multiply(b);
}
/**
* 创建平移矩阵(静态方法)
* @param x X方向平移
* @param y Y方向平移
* @returns 新的平移矩阵
*/
static translation(x: number, y: number): Matrix3 {
return new Matrix3().makeTranslation(x, y);
}
/**
* 创建旋转矩阵(静态方法)
* @param angle 旋转角度(弧度)
* @returns 新的旋转矩阵
*/
static rotation(angle: number): Matrix3 {
return new Matrix3().makeRotation(angle);
}
/**
* 创建缩放矩阵(静态方法)
* @param scaleX X方向缩放
* @param scaleY Y方向缩放
* @returns 新的缩放矩阵
*/
static scale(scaleX: number, scaleY: number): Matrix3 {
return new Matrix3().makeScale(scaleX, scaleY);
}
/**
* 创建TRS平移-旋转-缩放)变换矩阵
* @param translation 平移向量
* @param rotation 旋转角度(弧度)
* @param scale 缩放向量
* @returns 新的TRS矩阵
*/
static TRS(translation: Vector2, rotation: number, scale: Vector2): Matrix3 {
const cos = Math.cos(rotation);
const sin = Math.sin(rotation);
return new Matrix3([
scale.x * cos, -scale.y * sin, translation.x,
scale.x * sin, scale.y * cos, translation.y,
0, 0, 1
]);
}
// 字符串转换
/**
* 转换为字符串
* @returns 字符串表示
*/
toString(): string {
const e = this.elements;
return `Matrix3(\n` +
` ${e[0].toFixed(3)}, ${e[1].toFixed(3)}, ${e[2].toFixed(3)}\n` +
` ${e[3].toFixed(3)}, ${e[4].toFixed(3)}, ${e[5].toFixed(3)}\n` +
` ${e[6].toFixed(3)}, ${e[7].toFixed(3)}, ${e[8].toFixed(3)}\n` +
`)`;
}
/**
* 转换为数组
* @returns 矩阵元素数组
*/
toArray(): number[] {
return Array.from(this.elements);
}
/**
* 转换为CSS transform字符串
* @returns CSS transform字符串
*/
toCSSTransform(): string {
const e = this.elements;
return `matrix(${e[0]}, ${e[3]}, ${e[1]}, ${e[4]}, ${e[2]}, ${e[5]})`;
}
}