Home >Web Front-end >H5 Tutorial >Share the example code of h5 canvas circle progress bar

Share the example code of h5 canvas circle progress bar

零下一度
零下一度Original
2017-05-27 15:10:042562browse

I have a lot of ideas for implementing the example code of h5 canvas circle progress bar, but using canvas is undoubtedly the most convenient solution. Here I take canvas implementation as an example. The specific implementation steps are as follows:

Share the example code of h5 canvas circle progress bar

Paste_Image.png

<!DOCTYPE html>
<html>
<meta charset="utf-8">
<head>
    <title></title>
    <style type="text/css">
        *{
            margin: 0;
            padding: 0;
        }
    </style>
    <!-- <script type="text/javascript" src="js/Progress.js"></script> -->
</head>
<body>
    <canvas id="canvas1"></canvas>
    <canvas id="canvas2"></canvas>
    <canvas id="canvas3"></canvas>

    <canvas id="canvas8"></canvas>
    <canvas id="canvas9"></canvas>
    <canvas id="canvas10"></canvas>

    <script type="text/javascript">
    window.onload = function(){
        new Progress().renderOne(&#39;canvas1&#39;,100,6,10);//id,画布宽和高,圆的半径 百分百。
        new Progress().renderOne(&#39;canvas2&#39;,100,5,20);
        new Progress().renderOne(&#39;canvas3&#39;,100,5,30);

        new Progress().renderOne(&#39;canvas8&#39;,100,5,80);
        new Progress().renderOne(&#39;canvas9&#39;,100,5,90);
        new Progress().renderOne(&#39;canvas10&#39;,100,5,100);
    }
    function Progress() {
    var progress = { textheight: null, renderOne: function(id, length, r, percent) {
            var canvas = document.getElementById(id);
            var context = canvas.getContext("2d");
            canvas.width = length;
            canvas.height = length;
            var i = 0;
            var interval = setInterval(function() { i++;
                progress.render(context, length, r, i, percent);
                if (i >= percent) { clearInterval(interval) } }, 10) }, render: function(context, length, r, i, percent) { context.clearRect(0, 0, length, length);
            context.beginPath();
            var gradient = context.createLinearGradient(length, 0, 0, 0);
            gradient.addColorStop("0", "#76EEC6");
            gradient.addColorStop("1.0", "#63B8FF");
            context.strokeStyle = gradient;
            context.lineWidth = r;
            context.arc(length / 2, length / 2, length / 2 - r, -0.5 * Math.PI, -0.5 * Math.PI + i * 0.02 * Math.PI, false);
            context.stroke();
            context.closePath();
            context.beginPath();
            context.strokeStyle = "#8d8d8d";
             context.strokeStyle =&#39;red&#39;;/////////////////////////////////////////////////
            context.lineWidth = 2;
            context.fillStyle = "#ffffff";
            context.arc(length / 2, r, 0.6 * r, 0, 2 * Math.PI, false);
            context.stroke();
            context.fill();
            context.closePath();
            context.beginPath();
            var radian = percent / 100 * 2 * Math.PI - 0.5 * Math.PI;
            var x = Math.cos(radian) * (length / 2 - r) + length / 2;
            var y = Math.sin(radian) * (length / 2 - r) + length / 2;
            context.arc(x, y, 0.6 * r, 0, 2 * Math.PI, false);
            context.stroke();
            context.fill();
            context.closePath();
            context.beginPath();
            context.lineWidth = 1;
            context.strokeStyle = "#54DDAF";
            context.fillStyle = "#54DDAF";
             context.fillStyle = "blue";///////////////////////////////////////
            context.arc(length / 2, length / 2, length / 2 - 2 * r, 0, 2 * Math.PI);
            context.fill();
            context.closePath();
            context.beginPath();
            context.font = "bold " + (length / 2 - 2.5 * r) / 2 + "px 微软雅黑";
            context.fillStyle = "#ffffff";
            var text = percent + "%";
            textwidth = context.measureText(text).width;
            if (this.textheight == null) {
                var p = document.createElement("p");
                document.body.appendChild(p);
                p.innerHTML = text;
                p.style.fontSize = ((length / 2 - 2.5 * r) / 2) + "px";
                this.textheight = p.offsetHeight;
                p.parentNode.removeChild(p) }
            textheight = this.textheight;
            context.fillText(text, (length - textwidth) / 2, length / 2 + textheight / 4);
            context.fill();
            context.closePath() } };
    return progress };



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

【Related Recommendations】

1. H5 Canvas Implementation of Circular Dynamic Loading Progress Example

2. Canvas implements a circular progress bar and displays a numerical percentage

3. HTML5 Programming

4. An example tutorial on mini program development using co to handle asynchronous processes

5. JS+canvas simple method of drawing circles_javascript skills

The above is the detailed content of Share the example code of h5 canvas circle progress bar. For more information, please follow other related articles on the PHP Chinese website!

Statement:
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn