class TransformMatrix {
  constructor() {
    this.reset();
  }
  
  reset() {
    this.a = 1;  // 水平缩放
    this.b = 0;  // 垂直倾斜
    this.c = 0;  // 水平倾斜
    this.d = 1;  // 垂直缩放
    this.tx = 0; // 水平移动
    this.ty = 0; // 垂直移动
    this.stack = [];
  }
  
  translate(dx, dy) {
    this.tx += this.a * dx + this.c * dy;
    this.ty += this.b * dx + this.d * dy;
  }
  
  scale(sx, sy, cx = 0, cy = 0) {
    // 移动到中心点
    this.translate(cx, cy);
    
    // 应用缩放
    this.a *= sx;
    this.b *= sx;
    this.c *= sy;
    this.d *= sy;
    
    // 移回原位置
    this.translate(-cx, -cy);
  }
  
  toArray() {
    return [this.a, this.b, this.c, this.d, this.tx, this.ty];
  }
  
  // 用于调试的字符串表示
  toString() {
    return `[${this.a.toFixed(2)}, ${this.b.toFixed(2)}, ${this.c.toFixed(2)}, ${this.d.toFixed(2)}, ${this.tx.toFixed(1)}, ${this.ty.toFixed(1)}]`;
  }
  
  // 克隆方法
  clone() {
    const clone = new TransformMatrix();
    clone.a = this.a;
    clone.b = this.b;
    clone.c = this.c;
    clone.d = this.d;
    clone.tx = this.tx;
    clone.ty = this.ty;
    return clone;
  }
	// 添加点坐标转换方法
	transformPoint(x, y) {
		return {
			x: this.a * x + this.c * y + this.tx,
			y: this.b * x + this.d * y + this.ty
		};
	}
	
	// 添加逆矩阵转换方法
	invertPoint(x, y, dpr) {
		console.log('invertPoint：',dpr)
	  const det = this.a * this.d - this.b * this.c;
	  if (Math.abs(det) < 0.0001) return {x, y};
	  
	  return {
	    x: (this.d * (x/dpr - this.tx) - this.c * (y/dpr - this.ty)) / det,
	    y: (this.a * (y/dpr - this.ty) - this.b * (x/dpr - this.tx)) / det
	  };
	}
	
}

export default TransformMatrix;