1#@!#!123s

: / home / tattooscyy / stage / public / canvas /
Filename : script.js
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var canvas, tool, context;

if(window.addEventListener) {
	
	function imgUpdate() {
		document.getElementById('canvasData').value = canvas.toDataURL('image/png');
	}
	
	function init() {
		canvas = document.getElementById('paint');
		if(!canvas) {
			alert('Error');
		}
		//console.log(canvas);
		//CanvasRenderingContext2D
		if(!canvas.getContext) {
			alert('Error');
		}
		context = canvas.getContext('2d');
		context.strokeStyle = '#000000';
		context.lineJoin = 'round';
		context.lineWidth = 4;
		
		tool = new tool_pencil();
		
		canvas.addEventListener('mousedown',func_canvas,false);
		canvas.addEventListener('mousemove',func_canvas,false);
		canvas.addEventListener('mouseup',func_canvas,false);
		
	}
	
	function func_canvas(event) {
		if(event.layerX || event.layerX == 0) {
			event._x = event.layerX;
			event._y = event.layerY;
		}
		else if(event.offsetX || event.offsetX == 0) {
			event._x = event.offsetX;
			event._y = event.offsetY;
		}
		var foo = tool[event.type];
		if(foo) {
			foo(event);
		}
	}
	
	function tool_pencil() {
		var tool = this;
		tool.started = false;
		
		tool.mousedown = function (event) {
			context.beginPath();
			context.moveTo(event._x, event._y);
			tool.started = true;
		}
		
		tool.mousemove = function (event) {
			
			if(tool.started) {
				context.lineTo(event._x, event._y);
				context.stroke();
			}
		}
		tool.mouseup = function (event) {
			if(tool.started) {
				//this.mousemove(event);
				tool.started = false;
				imgUpdate();
			}
		}
	}
	
	window.addEventListener('load',function() {
		
		document.getElementById('clear').addEventListener('click',function() {
			context.clearRect(0,0,canvas.width, canvas.height);
		},false);
		
		init();
		
	},false);
	
}