Drawing over an image using Raphael.js

问题

Can I put a Raphael.js canvas over an IMG element? What should I do make this layout work?

回答1:

Simply position the Raphaël canvas over the top of the image element using normal CSS techniques:

#wrapper {
    position: relative;
    padding: 0;
    outline: 1px solid #999;
}
#wrapper img {
    position: absolute;
    top: 0;
    left: 0;
}
#canvas {
    position: absolute;
    top: 0;
    left: 0;
}

Then nest your elements like this:

<div id="wrapper">
    <img src="myimage.jpg">
    <div id="canvas">  
    </div>
</div>

Here's a full example.

回答2:

z-index:2 or some high number for the raphael "paper" div (aka your raphael canvas... which you refer to by:

var paper = Raphael('somediv', 100, 400)

so just go to your css and at #somediv make sure you put it's z-index lower and then put your text div's z-index higher...

来源：https://stackoverflow.com/questions/3407333/drawing-over-an-image-using-raphael-js