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editor.html
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editor.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<title>Graphviz Online</title>
<style type="text/css" media="screen">
body {
overflow: hidden;
}
#editor {
margin: 0;
position: absolute;
top: 0;
bottom: 0;
right: 50%;
left: 0;
}
#review {
margin: 0;
position: absolute;
top: 0;
bottom: 0;
right: 0;
left: 50%;
overflow: scroll;
}
#status {
position: fixed;
bottom: 0;
display: block;
color: #FFF;
width: 0 auto;
z-index: 999;
}
</style>
</head>
<body>
<pre id="editor">digraph G {
subgraph cluster_0 {
style=filled;
color=lightgrey;
node [style=filled,color=white];
a0 -> a1 -> a2 -> a3;
label = "process #1";
}
subgraph cluster_1 {
node [style=filled];
b0 -> b1 -> b2 -> b3;
label = "process #2";
color=blue
}
start -> a0;
start -> b0;
a1 -> b3;
b2 -> a3;
a3 -> a0;
a3 -> end;
b3 -> end;
start [shape=Mdiamond];
end [shape=Msquare];
}</pre>
<div id="review" onclick="saveit(this);" title="Click to save it"></div>
<div id="status"></div>
<script src="ace/ace.js" type="text/javascript" charset="utf-8"></script>
<script>
(function(document){
//http://stackoverflow.com/a/10372280/398634
window.URL = window.URL || window.webkitURL;
var el_stetus = document.getElementById("status"), t_stetus=-1,
reviewer = document.getElementById("review"), scale = window.devicePixelRatio || 1;
function show_status(text, hide) {
hide = hide || 0;
clearTimeout(t_stetus);
el_stetus.innerHTML = text;
if (hide) {
t_stetus = setTimeout(function() { el_stetus.innerHTML = ""; }, hide);
}
}
function svgXmlToImage(svgXml, callback) {
var pngImage = new Image(), svgImage = new Image();
svgImage.onload = function() {
var canvas = document.createElement("canvas");
canvas.width = svgImage.width * scale;
canvas.height = svgImage.height * scale;
var context = canvas.getContext("2d");
context.drawImage(svgImage, 0, 0, canvas.width, canvas.height);
pngImage.src = canvas.toDataURL("image/png");
pngImage.width = svgImage.width;
pngImage.height = svgImage.height;
if (callback !== undefined) {
callback(null, pngImage);
}
}
svgImage.onerror = function(e) {
if (callback !== undefined) {
callback(e);
}
}
svgImage.src = svgXml;
}
window.saveit = function(el) {
if (el.firstChild) {
window.open(el.firstChild.src);
}
}
var worker = new Worker("viz.js");
worker.onmessage = function(e) {
show_status("done", 500);
svgXmlToImage(e.data.svgXml, function(err, image) {
while (reviewer.firstChild) {
reviewer.removeChild(reviewer.firstChild);
}
reviewer.appendChild(image);
})
};
var editor = ace.edit("editor"), lastHD = -1;
editor.setTheme("ace/theme/twilight");
editor.getSession().setMode("ace/mode/dot");
editor.getSession().on("change", function(e) {
clearTimeout(lastHD);
lastHD = setTimeout(function(){
show_status("rendering...");
worker.postMessage({ "src": editor.getValue(), "format": "png-image-element"});
/*
// debug lines
var image = Viz({ "src": editor.getValue(), "format": "png-image-element"});
while (reviewer.firstChild) {
reviewer.removeChild(reviewer.firstChild);
}
reviewer.appendChild(image);
*/
}, 1500);
});
/* Init */
if (editor.getValue()) {
show_status("rendering...");
worker.postMessage({ "src": editor.getValue(), "format": "png-image-element"});
}
})(document);
</script>
<script src="viz.js" type="text/javascript" charset="utf-8"></script>
</body>
</html>