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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);
}
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;
}
translated = (x: number, y: number): Transform => {
return this.copy().translate(x, y);
}
preTranslate = (x: number, y: number): Transform => {
this._translateX += x * this._scale;
this._translateY += y * this._scale;
return this;
}
preTranslated = (x: number, y: number): Transform => {
return this.copy().preTranslate(x, y);
}
scale = (scale: number): Transform => {
this._scale *= scale;
return this;
}
scaled = (scale: number): Transform => {
return this.copy().scale(scale);
}
preScale = (scale: number): Transform => {
this._scale *= scale;
this._translateX *= scale;
this._translateY *= scale;
return this;
}
preScaled = (scale: number): Transform => {
return this.copy().preScale(scale);
}
transform = (transform: Transform): Transform => {
this._translateX += transform._translateX * this._scale;
this._translateY += transform._translateY * this._scale;
this._scale *= transform._scale;
return this;
}
transformed = (transform: Transform): Transform => {
return this.copy().transform(transform);
}
preTransform = (transform: Transform): Transform => {
this._translateX = transform._translateX + this._translateX * transform._scale;
this._translateY = transform._translateY + this._translateY * transform._scale;
this._scale *= transform._scale;
return this;
}
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];
}
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);
}
}
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