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export class Transform {
private _translateX: number = 0;
private _translateY: number = 0;
private _scale: number = 1;
static 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): this => {
this._translateX += x;
this._translateY += y;
return this;
}
scale = (scale: number): this => {
this._scale *= scale;
this._translateX *= scale;
this._translateY *= scale;
return this;
}
scaleAbout = (scale: number, x: number, y: number): this => {
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): this => {
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): this => {
this._translateX += this._scale * x;
this._translateY += this._scale * y;
return this;
}
preScale = (scale: number): this => {
this._scale *= scale;
return this;
}
preTransform = (transform: Transform): this => {
this._translateX += transform._translateX * this._scale;
this._translateY += transform._translateY * this._scale;
this._scale *= transform._scale;
return this;
}
translated = (x: number, y: number): Transform => this.copy().translate(x, y);
preTranslated = (x: number, y: number): Transform => this.copy().preTranslate(x, y);
scaled = (scale: number): Transform => this.copy().scale(scale);
scaledAbout = (scale: number, x: number, y: number): Transform => this.copy().scaleAbout(scale, x, y);
preScaled = (scale: number): Transform => this.copy().preScale(scale);
transformed = (transform: Transform): Transform => this.copy().transform(transform);
preTransformed = (transform: Transform): Transform => 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] => [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 = () => new Transform(-this._translateX / this._scale, -this._translateY / this._scale, 1 / this._scale);
copy = () => new Transform(this._translateX, this._translateY, this._scale);
}
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