Charting with flask, rgraph and custom "timeseries database"

author: Yves Fischer <yvesf-git@xapek.org> 2011-10-23 21:14:40 +0200
committer: Yves Fischer <yvesf-git@xapek.org> 2011-10-30 11:33:54 +0100
commit: 770ba5201f5c60b2bb36602ff9d359f641e33125 (patch)
tree: 2200757f04efbc281c4b3714bfe2e4fe911193b6 /schall/static/RGraph/docs/dynamic.html
parent: 77f5e686612898974e13f2a5df57c20e4e529363 (diff)
download: mini-octopus-770ba5201f5c60b2bb36602ff9d359f641e33125.tar.gz
mini-octopus-770ba5201f5c60b2bb36602ff9d359f641e33125.zip
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+<!DOCTYPE html>
+<html>
+<head>
+    <meta http-equiv="X-UA-Compatible" content="chrome=1">
+    <!--
+        /**
+        * o------------------------------------------------------------------------------o
+        * | This file is part of the RGraph package - you can learn more at:             |
+        * |                                                                              |
+        * |                          http://www.rgraph.net                               |
+        * |                                                                              |
+        * | This package is licensed under the RGraph license. For all kinds of business |
+        * | purposes there is a small one-time licensing fee to pay and for non          |
+        * | commercial  purposes it is free to use. You can read the full license here:  |
+        * |                                                                              |
+        * |                      http://www.rgraph.net/LICENSE.txt                       |
+        * o------------------------------------------------------------------------------o
+        */
+    -->
+    <title>RGraph: HTML5 Javascript charts library - Updating your charts dynamically</title>
+    
+    <meta name="keywords" content="rgraph html5 canvas charts docs dynamic" />
+    <meta name="description" content="RGraph: HTML5 Javascript charts library - Updating your charts dynamically" />
+    
+    <meta property="og:title" content="RGraph: HTML5 Javascript charts library" />
+    <meta property="og:description" content="A charts library based on the HTML5 canvas tag" />
+    <meta property="og:image" content="http://www.rgraph.net/images/logo.png"/>
+
+    <link rel="stylesheet" href="../css/website.css" type="text/css" media="screen" />
+    <link rel="icon" type="image/png" href="/favicon.png">
+    
+    <!-- Place this tag in your head or just before your close body tag -->
+    <script type="text/javascript" src="https://apis.google.com/js/plusone.js"></script>
+    
+    <script src="../libraries/RGraph.common.core.js" ></script>
+    <script src="../libraries/RGraph.common.context.js" ></script>
+    <script src="../libraries/RGraph.line.js" ></script>
+    <!--[if IE 8]><script src="../excanvas/excanvas.original.js"></script><![endif]-->
+
+    <script>
+      var _gaq = _gaq || [];
+      _gaq.push(['_setAccount', 'UA-54706-2']);
+      _gaq.push(['_trackPageview']);
+    
+      (function() {
+        var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true;
+        ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
+        var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
+      })();
+    </script>
+</head>
+<body>
+
+    
+    <!-- Social networking buttons -->
+        <div id="social_icons" class="warning" style="border-radius: 10px; top: 1px; position: fixed; width: 120px; height: 20px">
+            <!-- <a title="Bookmark with delicious" href="http://delicious.com/save?jump=close&v=4&noui&jump=close&url=http://www.rgraph.net&notes=RGraph%20is%20a%20HTML5%20based%20javascript%20charts%20library%20supporting%20a%20wide%20range%20of%20different%20chart%20types&title=RGraph:%20Javascript%20charts%20%26%20graph%20library" target="_blank"><img src="../images/delicious.png" alt="Bookmark with delicious" width="22" height="22" border="0" style="position: relative; top: 1px" /></a> -->
+            <a href="http://twitter.com/home/?status=RGraph%3A%20Javascript+charts+library+http%3A%2F%2Fwww.rgraph.net+%23rgraph+%23html5+%23canvas+%23javascript+%23charts+@_rgraph" target="_blank" title="Mention RGraph on Twitter"><img src="../images/twitter.png" alt="Mention RGraph on Twitter"/></a>
+            <iframe src="http://www.facebook.com/plugins/like.php?app_id=253862424642173&amp;href=http%3A%2F%2Fwww.rgraph.net&amp;send=false&amp;layout=button_count&amp;width=450&amp;show_faces=false&amp;action=like&amp;colorscheme=light&amp;font=arial&amp;height=21" scrolling="no" frameborder="0" style="width: 80px; height:21px; position: relative; top: 1px"></iframe>
+        </div>
+        
+        <script>
+            // Opera fix
+            if (navigator.userAgent.indexOf('Opera') == -1) {
+              document.getElementById("social_icons").style.position = 'fixed';
+            }
+        </script>
+        
+        <div id="google_plusone">
+            <!-- Place this tag where you want the +1 button to render -->
+            <g:plusone href="http://www.rgraph.net"></g:plusone>
+        </div>
+    <!-- Social networking buttons -->
+
+
+<div id="breadcrumb">
+    <a href="../index.html">RGraph: HTML5 Javascript charts library</a>
+    >
+    <a href="index.html">Documentation</a>
+    >
+    Updating your charts dynamically
+</div>
+
+    <h1>RGraph: <span>HTML5 Javascript charts library</span> - Updating your charts dynamically</h1>
+
+    <script>
+        if (RGraph.isIE8()) {
+            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 charts, 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.</div>');
+        }
+    </script>
+
+    <canvas id="cvs" width="600" height="250" style="float: right">[No canvas support]</canvas>
+    <script>
+        window.onload = function (e)
+        {
+            d1 = [];
+            d2 = [];
+        
+            // Pre-pad the arrays with 100 null values
+            for (var i=0; i<100; ++i) {
+                d1.push(null);
+                d2.push(null);
+            }
+
+            function getGraph(id, d1, d2)
+            {
+                var graph = new RGraph.Line(id, d1, d2);
+                graph.Set('chart.xticks', 100);
+                graph.Set('chart.background.barcolor1', 'white');
+                graph.Set('chart.background.barcolor2', 'white');
+                graph.Set('chart.title.xaxis', 'Time >>>');
+                graph.Set('chart.title.yaxis', 'Bandwidth (MB/s)');
+                graph.Set('chart.title.vpos', 0.5);
+                graph.Set('chart.title', 'Bandwidth used by servers 1 and 2');
+                graph.Set('chart.filled', true);
+                graph.Set('chart.fillstyle', ['#daf1fa', '#faa']);
+                graph.Set('chart.colors', ['rgb(169, 222, 244)', 'red']);
+                graph.Set('chart.linewidth', 1);
+                //graph.Set('chart.ylabels.inside', true);
+                graph.Set('chart.yaxispos', 'right');
+                graph.Set('chart.ymax', 20);
+                graph.Set('chart.xticks', 25);
+    
+                return graph;
+            }
+        
+            function drawGraph ()
+            {
+                RGraph.Clear(document.getElementById("cvs"));
+                
+                var graph = getGraph('cvs', d1, d2);
+                graph.Draw();
+                
+                // Add some data to the data arrays
+                var r1 = RGraph.random(7, 9);
+                var r2 = RGraph.random(7, 10);
+
+                d1.push(r1);
+                d2.push(r2);
+                
+                if (d1.length > 100) {
+                    d1 = RGraph.array_shift(d1);
+                    d2 = RGraph.array_shift(d2);
+                }
+    
+                if (document.all && RGraph.isIE8()) {
+                    alert('[MSIE] Sorry, Internet Explorer 8 is not fast enough to support animated charts');
+                } else {
+                    setTimeout(drawGraph,25);
+                }
+            }
+        
+            drawGraph();
+        }
+    </script>
+    
+    <p>
+        The example on the right shows a  line chart that automatically updates itself every 15 milliseconds. An ideal
+        use for this could be showing a networks bandwidth usage, or a servers load value.
+    </p>
+    
+    <p>
+        This particular example shows a stacked line chart with two data series, though if you're showing load/stress values, a
+        non-filled chart might be a better choice.
+    </p>
+    
+    <p>
+        To get up-to-date data from your server you could simply have the page refresh itself, storing the data on the server,
+        or use <a href="index.html#ajax">AJAX</a> if you want the data stored client-side.
+    </p>
+    
+    <p>
+        Be careful of the data types you use to pass the data to RGraph - you should use numbers to represent values, not strings.
+    </p>
+
+    <br clear="all" />
+    
+    <pre class="code">
+&lt;canvas id="cvs" width="600" height="250"&gt;[No canvas support]&lt;/canvas&gt;
+
+&lt;script&gt;
+    d1 = [];
+    d2 = [];
+    
+    // Pre-pad the arrays with 100 null values
+    for (var i=0; i&lt; 100; ++i) {
+        d1.push(null);
+        d2.push(null);
+    }
+
+    function getGraph(id, d1, d2)
+    {
+        var graph = new RGraph.Line(id, d1, d2);
+        graph.Set('chart.background.barcolor1', 'white');
+        graph.Set('chart.background.barcolor2', 'white');
+        graph.Set('chart.title.xaxis', 'Time');
+        graph.Set('chart.filled', true);
+        graph.Set('chart.fillstyle', ['#daf1fa', '#faa']);
+        graph.Set('chart.colors', ['rgb(169, 222, 244)', 'red']);
+        graph.Set('chart.linewidth', 3);
+        graph.Set('chart.ymax', 20);
+        graph.Set('chart.xticks', 25);
+
+        return graph;
+    }
+    
+    function drawGraph (e)
+    {
+        // Clear the canvas and redraw the chart
+        RGraph.Clear(document.getElementById("cvs"));
+        var graph = getGraph('cvs', d1, d2);
+        graph.Draw();
+        
+        // Add some data to the data arrays
+        d1.push(RGraph.random(5, 10));
+        d2.push(RGraph.random(5, 10));
+        
+        // Get rid of the first values of the arrays
+        if (d1.length > 100) {
+            d1 = RGraph.array_shift(d1);
+            d2 = RGraph.array_shift(d2);
+        }
+
+        setTimeout(drawGraph,25);
+    }
+    
+    drawGraph();
+&lt;/script&gt;
+</pre>
+
+</body>
+</html>
+\ No newline at end of file
author	Yves Fischer <yvesf-git@xapek.org>	2011-10-23 21:14:40 +0200
committer	Yves Fischer <yvesf-git@xapek.org>	2011-10-30 11:33:54 +0100
commit	770ba5201f5c60b2bb36602ff9d359f641e33125 (patch)
tree	2200757f04efbc281c4b3714bfe2e4fe911193b6 /schall/static/RGraph/docs/dynamic.html
parent	77f5e686612898974e13f2a5df57c20e4e529363 (diff)
download	mini-octopus-770ba5201f5c60b2bb36602ff9d359f641e33125.tar.gz mini-octopus-770ba5201f5c60b2bb36602ff9d359f641e33125.zip