transform-stack.ts

import { Matrix } from "./matrix";

export class TransformStack {
    private _transforms: Matrix[] = [];
    private _currentTransform: Matrix = Matrix.identity();
  
    public save(): void {
      this._transforms.push(this._currentTransform);
      this._currentTransform = this._currentTransform.clone();
    }
  
    public restore(): void {
      this._currentTransform = this._transforms.pop();
    }
  
    public translate(x: number, y: number): Matrix {
      return this._currentTransform.translate(x, y);
    }
  
    public rotate(angle: number): Matrix {
      return this._currentTransform.rotate(angle);
    }
  
    public scale(x: number, y: number): Matrix {
      return this._currentTransform.scale(x, y);
    }
  
    public set current(matrix: Matrix) {
      this._currentTransform = matrix;
    }
  
    public get current(): Matrix {
      return this._currentTransform;
    }
  }