73 lines
1.5 KiB
TypeScript
73 lines
1.5 KiB
TypeScript
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/**
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* 位置值对象
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* 表示二维空间中的坐标点
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*/
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export class Position {
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private readonly _x: number;
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private readonly _y: number;
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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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get x(): number {
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return this._x;
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}
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get y(): number {
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return this._y;
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}
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/**
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* 创建新的位置，加上偏移量
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*/
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add(offset: Position): Position {
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return new Position(this._x + offset._x, this._y + offset._y);
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}
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/**
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* 创建新的位置，减去偏移量
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*/
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subtract(other: Position): Position {
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return new Position(this._x - other._x, this._y - other._y);
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}
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/**
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* 计算到另一个位置的距离
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*/
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distanceTo(other: Position): number {
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const dx = this._x - other._x;
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const dy = this._y - other._y;
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return Math.sqrt(dx * dx + dy * dy);
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}
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/**
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* 值对象相等性比较
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*/
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equals(other: Position): boolean {
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return this._x === other._x && this._y === other._y;
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}
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/**
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* 转换为普通对象
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*/
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toObject(): { x: number; y: number } {
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return { x: this._x, y: this._y };
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}
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/**
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* 从普通对象创建
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*/
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static fromObject(obj: { x: number; y: number }): Position {
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return new Position(obj.x, obj.y);
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}
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/**
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* 创建零位置
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*/
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static zero(): Position {
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return new Position(0, 0);
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}
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}
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