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21 <title>RGraph: HTML5 canvas graph library - Retrieving a PNG of your graph</title>
23 <meta name="keywords" content="rgraph html5 canvas graph docs png image" />
24 <meta name="description" content="RGraph: HTML5 canvas graph library - Retrieving a PNG representation of your graph" />
26 <link rel="stylesheet" href="../css/website.css" type="text/css" media="screen" />
27 <link rel="icon" type="image/png" href="/favicon.png">
29 <script src="../libraries/RGraph.common.core.js" ></script>
30 <script src="../libraries/RGraph.common.context.js" ></script>
31 <script src="../libraries/RGraph.line.js" ></script>
32 <!--[if IE 8]><script src="../excanvas/excanvas.compressed.js"></script><![endif]-->
37 <!-- Social networking buttons -->
38 <script src="../libraries/RGraph.common.core.js" ></script>
41 function HideTwitterDIV ()
43 document.getElementById("twitter_div").style.opacity = 0;
44 document.getElementById("twitter_div").style.display = 'none';
48 function ShowTwitterDIV (e)
50 var e = RGraph.FixEventObject(document.all ? event : e);
51 var div = document.getElementById("twitter_div");
52 var img = document.getElementById("twitter_icon");
54 div.style.display = 'block';
55 div.style.left = (RGraph.getCanvasXY(img)[0] + img.offsetWidth - div.offsetWidth + 110) + 'px';
56 div.style.top = (RGraph.getCanvasXY(img)[1] - 1) + 'px';
61 setTimeout('document.getElementById("twitter_div").style.opacity = 0.2;', 25);
62 setTimeout('document.getElementById("twitter_div").style.opacity = 0.4;', 50);
63 setTimeout('document.getElementById("twitter_div").style.opacity = 0.6;', 100);
64 setTimeout('document.getElementById("twitter_div").style.opacity = 0.8;', 125);
65 setTimeout('document.getElementById("twitter_div").style.opacity = 1.0;', 150);
73 * This code installs the event handler that hides the Twitter DIV
76 window.attachEvent('onload', function () {document.body.attachEvent('onclick', HideTwitterDIV);});
78 window.addEventListener('click', HideTwitterDIV, false);
82 <!-- The twitter DIV -->
83 <div id="twitter_div" style="position: absolute;top: 0;left: 0;background-color: #eee;border: 2px dashed black;box-shadow: 0 0 15px #aaa;-moz-box-shadow: 0 0 15px #aaa;-webkit-box-shadow: 0 0 15px #aaa;padding: 3px;display: none;opacity: 0;z-index: 99;">
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85 <a href="http://twitter.com/_rgraph" style="text-decoration: none" rel="nofollow" target="_blank">Follow for HTML5 news</a>
88 <div id="social_icons" class="warning" style="top: 0; left: 5px; position: absolute">
91 if (navigator.userAgent.indexOf('Opera') == -1) {
92 document.getElementById("social_icons").style.position = 'fixed';
93 document.getElementById("twitter_div").style.position = 'fixed';
98 <b style="display: inline-block; position: relative; top: 1px">Bookmark and share:</b>
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103 <img src="../images/delicious.png" alt="Bookmark with delicious" width="22" height="22" border="0" align="absmiddle" />
106 <a href="" target="_blank" onmouseover="if (document.getElementById('twitter_div').style.display == 'none') ShowTwitterDIV(event);" onclick="event.stopPropagation(); event.cancelBubble = true; return false">
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112 <a title="Post to Google Buzz!" href="" onclick="window.open('http://www.google.com/buzz/post?url=http://www.rgraph.net&imageurl=http://www.rgraph.net/images/logo.png', 'google_buzz_window', 'width=800,height=400,top=100,left=100'); return false">
113 <img src="../images/buzz.png" width="22" height="22" alt="Post to Google Buzz!" align="absmiddle" style="position: relative; top: -2px; border: 0" border="0"/>
117 <a title="Share RGraph on Facebook" href="" onclick="window.open('http://www.facebook.com/sharer.php?u=http://www.rgraph.net&t=RGraph:%20HTML5%20canvas%20graph%20library', 'facebook_window', 'width=500,height=300,top=100,left=100'); return false">
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131 <!-- /Social networking buttons -->
134 <div id="breadcrumb">
135 <a href="../index.html">RGraph: HTML5 canvas graph library</a>
137 <a href="index.html">Documentation</a>
139 Updating your graphs dynamically
142 <h1>RGraph: HTML5 canvas graph library - Updating your graphs dynamically</h1>
145 if (RGraph.isIE8()) {
146 document.write('<div style="background-color: #fee; border: 2px dashed red; padding: 5px"><b>Important</b><br /><br /> Internet Explorer 8 does not natively support the HTML5 canvas tag, so if you want to see the graphs, you can either:<ul><li>Install <a href="http://code.google.com/chrome/chromeframe/">Google Chrome Frame</a></li><li>Use ExCanvas. This is provided in the RGraph Archive.</li><li>Use another browser entirely. Your choices are Firefox 3.5+, Chrome 2+, Safari 4+ or Opera 10.5+. </li></ul> <b>Note:</b> Internet Explorer 9 fully supports the canvas tag. Click <a href="http://groups.google.com/group/rgraph/browse_thread/thread/c5651ff8c56b8f3c#" target="_blank">here</a> to see some screenshots.</div>');
150 <canvas id="cvs" width="600" height="250" style="float: right">[No canvas support]</canvas>
152 window.onload = function (e)
157 // Pre-pad the arrays with 100 null values
158 for (var i=0; i<400; ++i) {
163 function getGraph(id, d1, d2)
165 var graph = new RGraph.Line(id, d1, d2);
166 graph.Set('chart.xticks', 100);
167 graph.Set('chart.gutter', 25);
168 graph.Set('chart.background.barcolor1', 'white');
169 graph.Set('chart.background.barcolor2', 'white');
170 graph.Set('chart.title.xaxis', 'Time >>>');
171 graph.Set('chart.title.yaxis', 'Bandwidth (MB/s)');
172 graph.Set('chart.title', 'Bandwidth used by servers 1 and 2');
173 graph.Set('chart.filled', true);
174 graph.Set('chart.fillstyle', ['#daf1fa', '#faa']);
175 graph.Set('chart.colors', ['rgb(169, 222, 244)', 'red']);
176 graph.Set('chart.linewidth', 1);
177 //graph.Set('chart.ylabels.inside', true);
178 graph.Set('chart.yaxispos', 'right');
179 graph.Set('chart.ymax', 20);
180 graph.Set('chart.xticks', 25);
185 function drawGraph ()
187 RGraph.Clear(document.getElementById("cvs"));
189 var graph = getGraph('cvs', d1, d2);
192 // Add some data to the data arrays
193 var r1 = RGraph.random(7, 9);
194 var r2 = RGraph.random(7, 10);
199 if (d1.length > 400) {
200 d1 = RGraph.array_shift(d1);
201 d2 = RGraph.array_shift(d2);
204 if (document.all && RGraph.isIE8()) {
205 alert('[MSIE] Sorry, Internet Explorer 8 is not fast enough to support animated charts');
207 setTimeout(drawGraph,15);
216 The example on the right shows a line chart that automatically updates itself every 250 milliseconds. An ideal
217 use for this could be showing a networks bandwidth usage, or a servers load value.
221 This particular example shows a stacked line chart with two data series, though if you're showing load/stress values, a
222 non-filled chart might be a better choice.
226 To get up-to-date data from your server you could simply have the page refresh itself, storing the data on the server,
227 or use <a href="index.html#ajax">AJAX</a> if you want the data stored client-side.
231 Be careful of the data types you use to pass the data to RGraph - you should use numbers to represent values, not strings.
237 <canvas id="cvs" width="600" height="250">[No canvas support]</canvas>
243 // Pre-pad the arrays with 100 null values
244 for (var i=0; i< 100; ++i) {
249 function getGraph(id, d1, d2)
251 var graph = new RGraph.Line(id, d1, d2);
252 graph.Set('chart.gutter', 25);
253 graph.Set('chart.background.barcolor1', 'white');
254 graph.Set('chart.background.barcolor2', 'white');
255 graph.Set('chart.title.xaxis', 'Time');
256 graph.Set('chart.filled', true);
257 graph.Set('chart.fillstyle', ['#daf1fa', '#faa']);
258 graph.Set('chart.colors', ['rgb(169, 222, 244)', 'red']);
259 graph.Set('chart.linewidth', 3);
260 graph.Set('chart.ymax', 20);
261 graph.Set('chart.xticks', 25);
266 function drawGraph (e)
268 // Clear the canvas and redraw the graph
269 RGraph.Clear(document.getElementById("cvs"));
270 var graph = getGraph('cvs', d1, d2);
273 // Add some data to the data arrays
274 d1.push(RGraph.random(5, 10));
275 d2.push(RGraph.random(5, 10));
277 // Get rid of the first values of the arrays
278 if (d1.length > 100) {
279 d1 = RGraph.array_shift(d1);
280 d2 = RGraph.array_shift(d2);
283 setTimeout(drawGraph,250);