shikaiguo.github.io/draw.html at master · iakihsoug/shikaiguo.github.io · GitHub

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<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <link href="https://fonts.googleapis.com/icon?family=Material+Icons" rel="stylesheet">
    <link href="/lib/css/normalize.min.css" rel="stylesheet">
    <link href="/lib/css/common.css" rel="stylesheet">
    <style for="canvas">
        .canvas-div{
            height: 4111px;
            width: 1024px;
            margin: 0 auto;
        }
        #canvas{
            height: 4111px;
            width: 1024px;
            margin: 0 auto;
        }
        /*.paint{*/
            /*background-color: #dddddd;*/
            /*position: fixed;*/
            /*width: 4rem;*/
            /*height: 12rem;*/
            /*right: 1rem;*/
            /*top: 10rem;*/
        /*}*/
    </style>
</head>
<body>
<div class="container">
    <header role="banner">
        <div class="back-top">
            <i class="material-icons">keyboard_arrow_up</i>
        </div>
    </header>
    <nav role="menu">
        <ul>
            <li>
                <a href="/">IO</a>
            </li>
            <li>
                <a href="/im.html">IM</a>
            </li>
            <li>
                <a href="/draw.html">Draw</a>
            </li>
        </ul>
    </nav>
    <div class="blank"></div>
    <div class="canvas-div">
        <canvas id="canvas"></canvas>
    </div>
    <!--<div class="paint">-->
        <!--<input>-->
    <!--</div>-->
    <footer>
        <div class="copy left"><a href="http://guoshikai.com">guoshikai.com</a> &copy; 2016</div>
        <div class="right">
            <a href="https://github.com/shikaiguo">Github</a>
        </div>
    </footer>
</div>
<script src="/lib/js/jquery-3.1.1.min.js"></script>
<script src="/lib/layer/layer.js"></script>
<script>
    $(function(){
        $(document).scroll(scrollListener);
        scrollListener();
        webSocketInit();
        $(".back-top").click(function(){
            $("body").animate({ scrollTop: 0 }, 200);
        });
    });
</script>
<script>

    var navHeight = false;
    var navStatus = false;
    function scrollListener(){
        var documentScrollTop = $(document).scrollTop();
        /* nav */
        navHeight = navHeight || $("nav").offset().top + 1;
        var f = documentScrollTop > navHeight;
        if(f !== navStatus){
            navStatus = f;
            $("nav,.blank").toggleClass("nav-pin");
            $(".back-top").fadeToggle(200);
        }
    }

    var canvas;
    var context;
    function canvasInit(){
        canvas = $("#canvas")[0];
        canvas.setAttribute('width', $("#canvas").width());
        canvas.setAttribute('height', $("#canvas").height());
        if (!canvas.getContext) {
            return;
        }
        context = canvas.getContext("2d");
        context.lineJoin = "round";
        context.lineWidth = 2;
        $("#canvas").mousedown(function(e){
            pointPush(e.pageX - this.offsetLeft, e.pageY - this.offsetTop);
            down = true;
        });
        $("#canvas").mousemove(function(e){
            if(true === down){
                pointPush(e.pageX - this.offsetLeft, e.pageY - this.offsetTop, true);
            }
        });
        $("#canvas").mouseup(function(e){
            down = false;
        });
//        $("#canvas").mouseleave(function(e){
//            down = false;
//        });

    }
</script>
<script>
    var ws;
    var url = "ws://api.guoshikai.com:64378";
    var fd;
    var color;
    function webSocketInit(){
        try {
            ws = new WebSocket(url);
            ws.onopen = function (f){
                canvasInit();
            }
            ws.onmessage = function (f) {
                var data = $.parseJSON(f.data);
                if("undefined" !== typeof data.user){
                    fd = data.user;
                    color = data.color||"#000";
                    return false;
                }
                redraw(data.fd, data);
            }
            ws.onclose = function (msg) {}
            // 超时 5s内没连接成功就断开
            setTimeout(function(){
                if(1 !== ws.readyState){
                    ws.close();
                    var confirm = layer.confirm('WebSocket连接超时，是否重连？', {
                        btn: ['是','否']
                    }, function(){
                        layer.close(confirm);
                        webSocketInit();
                    });
                }
            }, 5000);
        }
        catch (ex) {
            console.log(ex);
        }
    }
</script>
<script>
    var down = false;
    var lastPointArr = [];

    function pointPush(x, y, drag){
        if("undefined" === typeof drag){
            drag = false;
        }
        if("undefined" !== typeof lastPointArr[fd] && (Math.abs(lastPointArr[fd].x-x)+Math.abs(lastPointArr[fd].y-y) < 3)){
            return false;
        }
        sendFrame({
            x: x,
            y: y,
            d: drag,
            c: color
        })
        redraw(fd, {
            x: x,
            y: y,
            d: drag,
            c: color
        });
    }

    function redraw(fd, data){
        context.strokeStyle = data.c;
        context.beginPath();
        if(data.d && "undefined" !== typeof lastPointArr[fd]){
                context.moveTo(lastPointArr[fd].x, lastPointArr[fd].y);
        }else{
                context.moveTo(data.x-1, data.y);
        }
        context.lineTo(data.x, data.y);
        context.closePath();
        context.stroke();
        lastPointArr[fd]=data;

    }
    // 统一发送方法
    function sendFrame(f){
        try {
            ws.send(JSON.stringify(f));
        }catch (ex) {
            console.log(ex);
        }
    }
</script>
</body>
</html>