Scaling SVG (Raphael.js) like an SWF

Well hello Zévan,

I found a nice answer, made by a guy called Zevan. However, I found the code overcomplicated for my liking (Required jquery, did wierd stuff like "$(this)" etc).

So I simplified it. It's now short enough to fit into stackoverflow ;):

var paper;

window.ScaleRaphael = function(container, width, height) {
    var wrapper = document.getElementById(container);
    wrapper.style.width = width + "px";
    wrapper.style.height = height + "px";
    wrapper.style.overflow = "hidden";

    wrapper.innerHTML = "<div id='svggroup'><\/div>";
    var nestedWrapper = document.getElementById("svggroup");

    paper = new Raphael(nestedWrapper, width, height);
    paper.w = width;
    paper.h = height;
    paper.canvas.setAttribute("viewBox", "0 0 "+width+" "+height);
    paper.changeSize = function() {
        var w = window.innerWidth
        var h = window.innerHeight
        var ratioW = w / width;
        var ratioH = h / height;
        var scale = ratioW < ratioH ? ratioW : ratioH;

        var newHeight = Math.floor(height * scale);
        var newWidth = Math.floor(width * scale);

        wrapper.style.width = newWidth + "px";
        wrapper.style.height = newHeight + "px";
        paper.setSize(newWidth, newHeight);
    }
    window.onresize = function() {
        paper.changeSize();
    }

    paper.changeSize();

    return paper;
}

The only drawback from your version is that it requires SVG, it doesn't do VML. Is this a problem?

I'm using it with a simplified version of your demo page:

<!DOCTYPE html> 
<html lang="en"> 
<head>
<title>ScaleRaphaël Demo 1</title>
<meta charset="utf-8"> 

<script type="text/javascript" src="raphael.js"></script>
<script type="text/javascript" src="scale.raphael.js"></script>
<script type="text/javascript">

    window.onload = function() {
        var paper = new ScaleRaphael("wrap", 600, 400);

        // draw some random vectors:
        var path = "M " + paper.w / 2 + " " + paper.h / 2;
        for (var i = 0; i < 100; i++){
            var x = Math.random() * paper.w;
            var y = Math.random() * paper.h;
            paper.circle(x, y,
                Math.random() * 60 + 2).
                attr("fill", "rgb("+Math.random() * 255+",0,0)").
                attr("opacity", 0.5);
            path += "L " + x + " " + y + " ";
        }

        paper.path(path).attr("stroke","#ffffff").attr("stroke-opacity", 0.2);

        paper.text(200,100,"Resize the window").attr("font","30px Arial").attr("fill","#ffffff");
    }

      </script>
<style type="text/css">
    body, html {
        margin: 0;
        padding: 0;
        overflow: hidden;
    }

    #wrap{
        background-color: orange;
    }
</style>

</head>
<body>


It took me awhile but I finally came up with a solution to this problem. I've wrapped the solution in a small js file that can be used with Raphael. You can get the js file along with some simple documentation here. See it in action.

How it works:

  1. use viewBox for svg
  2. wrap all vml nodes in a group node
  3. wrap the Raphael constructor up so that the vml group node is passed to the Raphael constructor
  4. alter a few css properties when the paper is resized to deal with centering, clipping and maintaining the correct aspect ratio.

Any feedback would be greatly appreciated.

Tags:

Javascript

Flash

Svg

Vml

Raphael

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