'Select/drag-and-drop functionality in HTML5 Canvas and JS libraries?'-HTML Tutorial-php.cn

'Select/drag-and-drop functionality in HTML5 Canvas and JS libraries?'

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Release： 2023-09-02 11:13:02

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"HTML5 Canvas和JS库中的选择/拖放功能?"

If you want to use HTML5 canvas to draw shapes, text and curves, and also want to attach traditional DOM events such as onClick or drag and drop functionality, you can use the Crossbar framework Raphael To perform drag and drop operations drop or touch events.

This technique uses SVG and XML for older versions of IE. Drag and drop using HTML is shown below.

Example

<!DOCTYPE html>
<html lang = "en">
   <head>
      <meta charset = "utf-8">
         <title>Rapha&euml;l &middot; Drag-n-drop</title>
         <link rel = "stylesheet" href = "demo.css" type = "text/css" media = "screen">
         <meta name = "apple-mobile-web-app-capable" content = "yes">
         <link rel = "apple-touch-icon-precomposed" href = "/Raphael.png">
         <link rel = "stylesheet" href = "demo-print.css" type = "text/css" media = "print">
         <script src = "raphael.js"></script>
         <script>
            window.onload = function () {
               var R = Raphael(0, 0, "100%", "100%"),
               r = R.circle(100, 100, 50).attr({fill: "hsb(0, 1, 1)", stroke: "none", opacity: .5}),
               g = R.circle(210, 100, 50).attr({fill: "hsb(.3, 1, 1)", stroke: "none", opacity: .5}),
               b = R.circle(320, 100, 50).attr({fill: "hsb(.6, 1, 1)", stroke: "none", opacity: .5}),
               p = R.circle(430, 100, 50).attr({fill: "hsb(.8, 1, 1)", stroke: "none", opacity: .5});
            var start = function () {
               this.ox = this.attr("cx");
               this.oy = this.attr("cy");
               this.animate({r: 70, opacity: .25}, 500, ">");
            },
            move = function (dx, dy) {
               this.attr({cx: this.ox + dx, cy: this.oy + dy});
            },
            up = function () {
               this.animate({r: 50, opacity: .5}, 500, ">");
            };
            R.set(r, g, b, p).drag(move, start, up);
         };
      </script>
   </head>
   <body>
      <div id = "holder"></div>
      <p id = "copy">Demo of <a href = "http://raphaeljs.com/">Rapha&euml;l</a>&mdash; JavaScript Vector Library</p>
   </body>
</html>

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