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6.4 KiB
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{"version":3,"file":"ObservablePoint.mjs","sources":["../../../src/maths/point/ObservablePoint.ts"],"sourcesContent":["import type { PointData } from './PointData';\nimport type { PointLike } from './PointLike';\n\n// eslint-disable-next-line @typescript-eslint/no-empty-interface\nexport interface ObservablePoint extends PixiMixins.ObservablePoint { }\n\n/**\n * Observer used to listen for observable point changes.\n * @memberof maths\n */\nexport interface Observer<T>\n{\n /** Callback to call when the point has updated. */\n _onUpdate: (point?: T) => void;\n}\n\n/**\n * The ObservablePoint object represents a location in a two-dimensional coordinate system, where `x` represents\n * the position on the horizontal axis and `y` represents the position on the vertical axis.\n *\n * An `ObservablePoint` is a point that triggers the `onUpdate` method on an observer when the point's position is changed.\n * @memberof maths\n */\nexport class ObservablePoint implements PointLike\n{\n /** @ignore */\n public _x: number;\n /** @ignore */\n public _y: number;\n\n /** This object used to call the `onUpdate` callback when the point changes. */\n private readonly _observer: Observer<ObservablePoint>;\n\n /**\n * Creates a new `ObservablePoint`\n * @param observer - Observer to pass to listen for change events.\n * @param {number} [x=0] - position of the point on the x axis\n * @param {number} [y=0] - position of the point on the y axis\n */\n constructor(observer: Observer<ObservablePoint>, x?: number, y?: number)\n {\n this._x = x || 0;\n this._y = y || 0;\n\n this._observer = observer;\n }\n\n /**\n * Creates a clone of this point.\n * @param observer - Optional observer to pass to the new observable point.\n * @returns a copy of this observable point\n */\n public clone(observer?: Observer<ObservablePoint>): ObservablePoint\n {\n return new ObservablePoint(observer ?? this._observer, this._x, this._y);\n }\n\n /**\n * Sets the point to a new `x` and `y` position.\n * If `y` is omitted, both `x` and `y` will be set to `x`.\n * @param {number} [x=0] - position of the point on the x axis\n * @param {number} [y=x] - position of the point on the y axis\n * @returns The observable point instance itself\n */\n public set(x = 0, y = x): this\n {\n if (this._x !== x || this._y !== y)\n {\n this._x = x;\n this._y = y;\n this._observer._onUpdate(this);\n }\n\n return this;\n }\n\n /**\n * Copies x and y from the given point (`p`)\n * @param p - The point to copy from. Can be any of type that is or extends `PointData`\n * @returns The observable point instance itself\n */\n public copyFrom(p: PointData): this\n {\n if (this._x !== p.x || this._y !== p.y)\n {\n this._x = p.x;\n this._y = p.y;\n this._observer._onUpdate(this);\n }\n\n return this;\n }\n\n /**\n * Copies this point's x and y into that of the given point (`p`)\n * @param p - The point to copy to. 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