Function _moveForward

blockcode/code/turtle.js:76–89

(distance)

	function _moveForward(distance){
		var start = position;
		position = {
			x: cos(direction) * distance * PIXEL_RATIO + start.x,
			y: -sin(direction) * distance * PIXEL_RATIO + start.y
		};
		if (pen){
			ctx.lineStyle = color;
			ctx.beginPath();
			ctx.moveTo(start.x, start.y);
			ctx.lineTo(position.x, position.y);
			ctx.stroke();
		}
	}

	function penUp(){ pen = false; }
	function penDown(){ pen = true; }