diff options
Diffstat (limited to 'src/client/util/Transform.ts')
-rw-r--r-- | src/client/util/Transform.ts | 119 |
1 files changed, 119 insertions, 0 deletions
diff --git a/src/client/util/Transform.ts b/src/client/util/Transform.ts new file mode 100644 index 000000000..3e1039166 --- /dev/null +++ b/src/client/util/Transform.ts @@ -0,0 +1,119 @@ +export class Transform { + private _translateX: number = 0; + private _translateY: number = 0; + private _scale: number = 1; + + static get Identity(): Transform { + return new Transform(0, 0, 1); + } + + get TranslateX(): number { return this._translateX; } + get TranslateY(): number { return this._translateY; } + get Scale(): number { return this._scale; } + + constructor(x: number, y: number, scale: number) { + this._translateX = x; + this._translateY = y; + this._scale = scale; + } + + translate = (x: number, y: number): Transform => { + this._translateX += x; + this._translateY += y; + return this; + } + + scale = (scale: number): Transform => { + this._scale *= scale; + this._translateX *= scale; + this._translateY *= scale; + return this; + } + + scaleAbout = (scale: number, x: number, y: number): Transform => { + this._translateX += x * this._scale - x * this._scale * scale; + this._translateY += y * this._scale - y * this._scale * scale; + this._scale *= scale; + return this; + } + + transform = (transform: Transform): Transform => { + this._translateX = transform._translateX + transform._scale * this._translateX; + this._translateY = transform._translateY + transform._scale * this._translateY; + this._scale *= transform._scale; + return this; + } + + preTranslate = (x: number, y: number): Transform => { + this._translateX += this._scale * x; + this._translateY += this._scale * y; + return this; + } + + preScale = (scale: number): Transform => { + this._scale *= scale; + return this; + } + + preTransform = (transform: Transform): Transform => { + this._translateX += transform._translateX * this._scale; + this._translateY += transform._translateY * this._scale; + this._scale *= transform._scale; + return this; + } + + translated = (x: number, y: number): Transform => { + return this.copy().translate(x, y); + } + + preTranslated = (x: number, y: number): Transform => { + return this.copy().preTranslate(x, y); + } + + scaled = (scale: number): Transform => { + return this.copy().scale(scale); + } + + scaledAbout = (scale: number, x: number, y: number): Transform => { + return this.copy().scaleAbout(scale, x, y); + } + + preScaled = (scale: number): Transform => { + return this.copy().preScale(scale); + } + + transformed = (transform: Transform): Transform => { + return this.copy().transform(transform); + } + + preTransformed = (transform: Transform): Transform => { + return this.copy().preTransform(transform); + } + + transformPoint = (x: number, y: number): [number, number] => { + x *= this._scale; + x += this._translateX; + y *= this._scale; + y += this._translateY; + return [x, y]; + } + + transformDirection = (x: number, y: number): [number, number] => { + return [x * this._scale, y * this._scale]; + } + + transformBounds(x: number, y: number, width: number, height: number): { x: number, y: number, width: number, height: number } { + [x, y] = this.transformPoint(x, y); + [width, height] = this.transformDirection(width, height); + return { x, y, width, height }; + } + + inverse = () => { + return new Transform(-this._translateX / this._scale, -this._translateY / this._scale, 1 / this._scale) + } + + copy = () => { + return new Transform(this._translateX, this._translateY, this._scale); + } + +}
\ No newline at end of file |