ocanvas 画板

使用ocanvas做了个简单的在线画板。
效果如下：
主要代码如下：
<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8" />
    <title>oCanvas Example</title>
    <meta name="robots" content="noindex, nofollow">
    <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no" />
    <meta name="apple-mobile-web-app-capable" content="yes" />
    <meta name="apple-mobile-web-app-status-bar-style" content="black" />
    <script src="http://libs.useso.com/js/zepto/1.1.3/zepto.min.js"></script>
    <script>
    var line_color = '#000';
    var line_size = 3;
    $(function(){
        $('.tool .color div').click(function(){
            $('.tool .color div').removeClass('active');
            $(this).addClass('active');
            line_color = $(this).data('color');
            mouseDot.fill = line_color;
        });
        
        $('.tool .size div').click(function(){
            $('.tool .size div').removeClass('active');
            $(this).addClass('active');
            line_size = $(this).data('size');
            mouseDot.radius = Math.max(line_size / 2, 3);
        });
    });
    </script>
    
    <style>
    body, html {padding:0; margin:0; overflow:hidden;}
    
    .tool{position:absolute; top:10px; left:10px; border:solid 1px #aaa; background-color:#eee; border-radius:5px; padding-right:5px;}
    
    .tool .color {float:left; margin:5px; width:30px;}
    .tool .color div{width:24px; height:24px; border:solid 2px #aaa; margin-bottom:5px; opacity:0.5;}
    .tool .color div:hover{opacity:1; cursor:pointer;}
    .tool .color .active{opacity:1; border:solid 2px #000;}
    
    .tool .size {float:left; margin:5px; width:30px; margin-left:0;}
    .tool .size div{width:30px; height:30px; border:solid 2px #aaa; margin-bottom:5px; opacity:0.5;}
    .tool .size div:hover{opacity:1; cursor:pointer;}
    .tool .size .active{opacity:1; border:solid 2px #000;}
    .tool .size span{display:block; margin:3px auto; height:24px; background-color:black;}
    
    .btn {clear:both; margin-bottom:5px; text-align:center;}
    .btn input {padding:3px 15px;}
    </style>
</head>
<body>
    <canvas id="canvas" width="200" height="100"></canvas>
    
    <div class="tool">
        <div class="color">
            <div style="background:#000;" data-color="#000" class="active"></div>
            <div style="background:#f00;" data-color="#f00"></div>
            <div style="background:#0f0;" data-color="#0f0"></div>
            <div style="background:#00f;" data-color="#00f"></div>
            <div style="background:#ff0;" data-color="#ff0"></div>
            <div style="background:#0ff;" data-color="#0ff"></div>
            <div style="background:#f0f;" data-color="#f0f"></div>
            <div style="background:#fff;" data-color="#fff"></div>
        </div>
        
        <div class="size">
            <div class="active" data-size="3" ><span style="3px;" ></span></div>
            <div data-size="6" ><span style="6px;" ></span></div>
            <div data-size="9" ><span style="9px;" ></span></div>
            <div data-size="12"><span style="12px;"></span></div>
            <div data-size="15"><span style="15px;"></span></div>
            <div data-size="20"><span style="20px;"></span></div>
            <div data-size="25"><span style="25px;"></span></div>
        </div>
        
        <div class="btn">
            <input type="button" value="清 空" onclick="clearAll();" />
        </div>
    </div>
    
    <script src="js/ocanvas-2.7.3.min.js"></script>
    <script>
    var c = document.querySelector("#canvas"),
    ctx = c.getContext("2d");
    c.width = window.innerWidth;
    c.height = window.innerHeight;
    c.addEventListener("touchmove", function (e) { e.preventDefault(); }, false);
    
    
    var cs = oCanvas.create({
        canvas: "#canvas",
        background: "#fff",
        fps: 30,
        disableScrolling: true
    });
    
    var isDraw = false;
    var xx = 0;
    var yy = 0;
    var mouseDot;
    
    clearAll();
    
    cs.bind('mousedown', function(){
        drawBegin(cs.mouse.x, cs.mouse.y);
    }).bind('touchstart tap', function(){
        drawBegin(cs.touch.x, cs.touch.y);
    }).bind('mouseup touchend', function(){
        isDraw = false;
    }).bind('mousemove', function(){
        drawMove(cs.mouse.x, cs.mouse.y);
    }).bind('touchmove', function(){
        drawMove(cs.touch.x, cs.touch.y);
    });
    
    /*
    cs.setLoop(function () {
        mouseDot.x = cs.mouse.x;
        mouseDot.y = cs.mouse.y;
    }).start();
    */
    
    function drawBegin(x, y)
    {
        isDraw = true;
        
        xx = x;
        yy = y;
        
        var dot = cs.display.arc({
            x: x,
            y: y,
            radius: line_size / 2,
            start: 0,
            end: 360,
            fill: line_color
        });

        cs.addChild(dot);
    }
    
    function drawMove(x, y)
    {
        if (isDraw)
        {
            var line = cs.display.line({
                start: { x: xx, y: yy },
                end: { x: x, y: y },
                stroke: '' + line_size + 'px ' + line_color,
                cap: "round"
            });

            cs.addChild(line);
            
            xx = x;
            yy = y;
        }
        else
        {
            mouseDot.moveTo(x, y);
            cs.addChild(mouseDot);
            cs.draw.redraw();
        }
    }
    
    function clearAll()
    {
        cs.reset();
        
        // 处理鼠标
        cs.mouse.hide();
            
        mouseDot = cs.display.arc({
            x: -100,
            y: -100,
            radius: Math.max(line_size / 2, 3),
            start: 0,
            end: 360,
            fill: line_color,
            shadow: '0 0 5px #333'
        });

        cs.addChild(mouseDot);
    }

    </script>
</body>
</html>
程序下载：http://files.cnblogs.com/files/zjfree/ocanvas_draw.rar