const turtle = {
  forward(distance) {
    const newX = x + Math.cos(degToRad(angle)) * distance;
    const newY = y + Math.sin(degToRad(angle)) * distance;

    if (penDown) {
      ctx.beginPath();
      ctx.moveTo(x, y);
      ctx.lineTo(newX, newY);
      ctx.stroke();
    }

    x = newX;
    y = newY;
  },

  backward(distance) {
    this.forward(-distance);
  },

  left(degrees) {
    angle -= degrees;
  },

  right(degrees) {
    angle += degrees;
  },

  penup() {
    penDown = false;
  },

  pendown() {
    penDown = true;
  },

  goto(newX, newY) {
    x = newX;
    y = newY;
  },

  home() {
    x = canvas.width / 2;
    y = canvas.height / 2;
    angle = 0;
  },

  circle(radius) {
    ctx.beginPath();
    ctx.arc(x, y, radius, 0, Math.PI * 2);
    ctx.stroke();
  },

  color(newColor) {
    ctx.strokeStyle = newColor;
  },

  width(size) {
    ctx.lineWidth = size;
  }
};

window.turtle = turtle;