ocanvas 画板

使用ocanvas做了个简单的在线画板。

ocanvas参考:http://ocanvas.org/

效果如下:

ocanvas 画板

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="width:3px;" ></span></div>

            <div data-size="6" ><span style="width:6px;" ></span></div>

            <div data-size="9" ><span style="width:9px;" ></span></div>

            <div data-size="12"><span style="width:12px;"></span></div>

            <div data-size="15"><span style="width:15px;"></span></div>

            <div data-size="20"><span style="width:20px;"></span></div>

            <div data-size="25"><span style="width: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

 

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