使用HTML5的cavas实现的一个画板

<!DOCTYPE html>
<html>

<head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <title>使用canvas制作画板</title>
    <link rel="stylesheet" href="">
    <style>
        body {
            background: #efe;
            padding-top: 50px;
        }

        #paint {
            border: 2px solid hsl(107, 98%, 56%);
            background: #fff;
            float: left;
        }

        #paint:hover {
            cursor: crosshair;
        }

        #Container {
            width: 800px;
            height: 100%;
            margin: 0 auto;
        }

        #Container .box {
            float: left;
            margin: 10px;
        }

        #Container .box button {
            color: #606060;
            border: 1px solid #b7b7b7;
            background: #ededed;
            cursor: pointer;
            text-shadow: 0 1px 1px rgba(0, 0, 0, .3);
            box-shadow: 0 1px 2px rgba(0, 0, 0, .2);
            width: 102px;
            font-size: 1em;
            height: 31px;
            margin-right: 20px;
            margin-left:20px;
        }
        #Container .box h3 {
            margin-top: 2px;
            display: inline-block;
        }

        #Container #image_png {
            float: left;
            width: 800px;
            height: 400px;
            border: 2px solid hsl(107, 98%, 56%);
            background: #fff;
            display: none;
        }

        #colorbox {
            width: 365px;
            height: 52px;
        }

        #colorbox>li {
            width: 50px;
            height: 50px;
            border: 1px solid rgba(0, 0, 0, 0.06);
            list-style: none;
            float: left;
        }

        #linewidth li {
            display: inline;
            font-size: 20px;
        }
    </style>
</head>

<body>
<div id="Container">
    <ul id="colorbox">
        <li></li>
        <li></li>
        <li></li>
        <li></li>
        <li></li>
        <li></li>
        <li></li>
    </ul>
    <canvas id="paint" width="800" height="400"></canvas>
    <div class="box">
        <button type="button" onclick="copyimage()">点击保存</button>
        <h3>滑动改变画笔粗细：</h3>
        <input type="range" min="5" max="50" value="50" id="trackBar">
        <h4 id="hh" style="display:inline">5</h4>
        <button onclick="clearAll(this)" id="clearAll_s">清除画布</button>
    </div>
    <img src="" id="image_png">
</div>
<script src="js/jquery-2.0.0.min.js"></script>
<script>
    var mycanvas = document.getElementById("paint");
    var ctx = mycanvas.getContext("2d");
    ctx.strokeStyle = "red";
    var flag = false;
    $("#paint").mousedown(function(e) { //当鼠标按下时
        var mouseX = e.pageX - this.offsetLeft;
        var mouseY = e.pageY - this.offsetTop;
        ctx.moveTo(mouseX, mouseY);
        flag = true;
    });
    $("#paint").mousemove(function(e) { //当鼠标抬起时
        if (flag == true) {
            var mouseX = e.pageX - this.offsetLeft;
            var mouseY = e.pageY - this.offsetTop;
            ctx.lineTo(mouseX, mouseY);

            ctx.stroke();
        }
    });
    $("#paint").mouseup(function(e) { //当鼠标移动时
        flag = false;
    });
    //实现颜色版
    var colors = ['#000000', '#ff0000', '#0000ff', '#FF7F24', '#00ffff', '#FFFF00', '#4EEE94'];
    var font = [20, 40, 60, 80, 100];
    var colorboxs = document.getElementById("colorbox").getElementsByTagName("li");

    for (var i = 0; i < colors.length; i++) {
        colorboxs[i].style.backgroundColor = colors[i];
    }
    //为画笔添加颜色
    $("li").each(function() {
        $(this).bind("click", function() {
            ctx.beginPath();
            ctx.strokeStyle = this.style.backgroundColor;
        });
    });
    //画笔加粗
    var trackBar = document.getElementById("trackBar");
    trackBar.value = 5;
    trackBar.addEventListener("change", function() {
        hh.innerHTML = this.value;
        ctx.beginPath();
        ctx.lineWidth = this.value;
    });
    //将图画保存
    function copyimage(event) {
        var img_png_src = mycanvas.toDataURL("image/png");
        document.getElementById("image_png").src = img_png_src;
        $("#image_png").css("display", "block")
    }
    //清除画布
    function clearAll() {
        ctx.clearRect(0, 0, 880, 400);
        ctx.beginPath();
    }

</script>
</body>
</html>

最后效果：
巴特西

使用HTML5的cavas实现的一个画板

最新文章

热门文章
