3

Ahoy StackOverflow!

I've run into the following problem: on IE7 only, if I call drawImage() after drawing anything to the canvas, excanvas does not draw the image at the desired x,y coordinates. I have looked on the excanvas project page/ google group, and found that there are known issues with the drawImage() function. ( for example: http://code.google.com/p/explorercanvas/issues/detail?id=104&q=IE7 )

I have tried restoring the identity matrix, as suggested here: Excanvas vml positioning issue , though it appears to have had no effect.

Attached is a simple html document demonstrating this issue:

<!DOCTYPE HTML>
<html>
<head>
    <script type="text/javascript" src="excanvas.js"></script>
    <script type="text/javascript">
        window.onload = function(){
            var icon, ctx;

            icon        = new Image();
            icon.width  = "20";
            icon.height = "20";
            icon.src    = "http://www.shangalulu.com/resources/images/icons/small/30.png";
            icon.onload = function(){
                var ctx;

                ctx = document.getElementById('the_canvas').getContext('2d');



                ctx.beginPath();
                ctx.moveTo(0,0);
                ctx.lineTo(500,0);
                ctx.lineTo(500,500);
                ctx.lineTo(0,500);
                ctx.lineTo(0,0);
                ctx.moveTo(200,200);
                ctx.lineTo(300,200);
                ctx.lineTo(300,300);
                ctx.lineTo(200,300);
                ctx.lineTo(200,200);
                ctx.moveTo(0,0);
                ctx.lineTo(500,500);
                ctx.moveTo(0,500);
                ctx.lineTo(500,0);
                ctx.stroke();


                ctx.drawImage(icon, 190, 190, 20, 20);
                ctx.drawImage(icon, 240, 240, 20, 20);
                ctx.drawImage(icon, 290, 290, 20, 20);

                return;
            }
        }
    </script>

</head>
<body>
    <canvas id="the_canvas" width="500" height="500"></canvas>
</body>
</html>

If you need the excanvas library to run this, you can grab it from here: http://code.google.com/p/explorercanvas/

The above script should do the following:

  1. it should draw an outline of the outer edges of the canvas (so you can see it)
  2. it should draw a 100x100 rectangle in the middle of the canvas.
  3. it should draw two lines that cross through the center of the canvas.
  4. it should draw three images: one on the top left corner of the inner box, one at the center, and one on the bottom right corner of the inner box.

What I would like to know is: Is there a known patch/workaround to this problem?

4

1 回答 1

1

我也一直在拉头发...

我只能找到一种解决方法，只要您在绘制图像之前不应用转换，它就可以正常工作。这意味着您将 excanvas.js 中的函数drawImage替换为该函数：

contextPrototype.drawImage = function(image, var_args) {
var dx, dy, dw, dh, sx, sy, sw, sh;

// to find the original width we overide the width and height
var oldRuntimeWidth = image.runtimeStyle.width;
var oldRuntimeHeight = image.runtimeStyle.height;
image.runtimeStyle.width = 'auto';
image.runtimeStyle.height = 'auto';

// get the original size
var w = image.width;
var h = image.height;

// and remove overides
image.runtimeStyle.width = oldRuntimeWidth;
image.runtimeStyle.height = oldRuntimeHeight;

if (arguments.length == 3) {
  dx = arguments[1];
  dy = arguments[2];
  sx = sy = 0;
  sw = dw = w;
  sh = dh = h;
} else if (arguments.length == 5) {
  dx = arguments[1];
  dy = arguments[2];
  dw = arguments[3];
  dh = arguments[4];
  sx = sy = 0;
  sw = w;
  sh = h;
} else if (arguments.length == 9) {
  sx = arguments[1];
  sy = arguments[2];
  sw = arguments[3];
  sh = arguments[4];
  dx = arguments[5];
  dy = arguments[6];
  dw = arguments[7];
  dh = arguments[8];
} else {
  throw Error('Invalid number of arguments');
}
/////////////////////////// MODIFIED BIT ///////////////////////////
var vmlStr = [];
vmlStr.push('<g_vml_:image src="', image.src, '"',
            ' style="position:absolute;',
            ' top:', dy, 'px;',
            ' left:', dx, 'px;',
            ' width:', dw, 'px;',
            ' height:', dh, 'px;"',
            ' cropleft="', sx / w, '"',
            ' croptop="', sy / h, '"',
            ' cropright="', (w - sx - sw) / w, '"',
            ' cropbottom="', (h - sy - sh) / h, '"',
            ' />');
/////////////////////////// END OF MODIFIED BIT ///////////////////////////

this.element_.insertAdjacentHTML('BeforeEnd',
                                vmlStr.join(''));
};

它所做的只是直接在伪画布内创建一个 VML 图像，而不是像最初那样将其包装在一个组中。出于某种原因，原始代码导致图像周围出现左侧和顶部填充，并且无法弄清楚原因。在我们了解其原因之前，我们将无法找到适当的解决方案......

于 2012-05-31T16:08:02.177 回答