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| 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/png.html | |
| parent | 77f5e686612898974e13f2a5df57c20e4e529363 (diff) | |
| download | mini-octopus-770ba5201f5c60b2bb36602ff9d359f641e33125.tar.gz mini-octopus-770ba5201f5c60b2bb36602ff9d359f641e33125.zip | |
Charting with flask, rgraph and custom "timeseries database"
Diffstat (limited to 'schall/static/RGraph/docs/png.html')
| -rw-r--r-- | schall/static/RGraph/docs/png.html | 214 |
1 files changed, 214 insertions, 0 deletions
diff --git a/schall/static/RGraph/docs/png.html b/schall/static/RGraph/docs/png.html new file mode 100644 index 0000000..a5eafe3 --- /dev/null +++ b/schall/static/RGraph/docs/png.html @@ -0,0 +1,214 @@ +<!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 - Retrieving a PNG of your graph</title> + + <meta name="keywords" content="rgraph html5 canvas charts docs png image" /> + <meta name="description" content="RGraph: HTML5 Javascript charts library - Retrieving a PNG representation of your chart" /> + + <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.jpg"/> + + <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> + window.onload = function () + { + line = new RGraph.Line('cvs', [4,3,7,4,5,6,7,4,8,9]); + line.Set('chart.labels', ['Dez', 'Fliss','Geoff','Hoolio','John','Rich','Kev','Charles','Lou','Bob']); + line.Set('chart.hmargin', 5); + line.Set('chart.title', 'Retrieving a PNG of your chart (context menu)'); + line.Set('chart.title.vpos', 0.5); + line.Set('chart.tickmarks', 'endcircle'); + + line.Set('chart.contextmenu', [ + ['Get PNG', RGraph.showPNG], + null, + ['Cancel', function () {}] + ]); + + line.Set('chart.linewidth', 2); + line.Set('chart.shadow', true); + line.Set('chart.shadow.offsetx', 0); + line.Set('chart.shadow.offsety', 0); + line.Set('chart.shadow.blur', 15); + line.Set('chart.shadow.color', 'red'); + + RGraph.Clear(line.canvas, 'white'); // This effectively sets the background color to be white + + line.Draw(); + } + </script> + + <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¬es=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&href=http%3A%2F%2Fwww.rgraph.net&send=false&layout=button_count&width=450&show_faces=false&action=like&colorscheme=light&font=arial&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> + > + Retrieving a PNG of your chart +</div> + + <h1>RGraph: <span>HTML5 Javascript charts library</span> - Retrieving a PNG of your chart</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> + + <style> + span#png_link { + position: absolute; + left: 535px; + top: 30px; + border: 1px black solid; + padding: 1px; + background-color: white; + cursor: pointer; + color: blue; + font-size: 10pt; + border: 2px solid gray; + border-radius: 5px; + font-weight: bold; + font-family: Arial; + } + </style> + + <div style="position: relative"> + <span id="png_link" onclick="RGraph.showPNG(document.getElementById('cvs'), event);">PNG</span> + <canvas id="cvs" width="600" height="250" style="float: left">[No canvas support]</canvas> + </div> + + + <p> + RGraph provides an easy way to get a PNG image of your chart. This allows you to + easily save the image locally to use in (for example) a document, spreadsheet or presentation. + </p> + + <p> + Originally, the function was designed to be used with a context menu, so it is located in the <i>RGraph.common.context.js</i>. + Now though, you do not have to use the function with a context menu, and can instead pass in the canvas as the optional argument. There's an + example of its usage on the first <a href="../examples/radar.html">Radar example</a href>. + </p> + + <br clear="all" /> + + <p>Include the context menu code:</p> + <pre class="code"><script src="../libraries/RGraph.common.context.js" ></script></pre> + + <p>Add the context menu:</p> + <pre class="code"> +myGraph.Set('chart.contextmenu', [ + <span style="color: green">['Get PNG', RGraph.showPNG]</span>, + null, + ['Cancel', function () {}] + ]);</pre> + + <h4>Using the function without a context menu</h4> + + <p> + If you want to use the function with a piece of text (or an image) as the "link", optionally positioned over the canvas, you can pass + the canvas into the function as an argument, along with the event object. + </p> + + <pre class="code"> +<!-- This CSS positions the link over the top right of the canvas --> +<style> + span#png_link { + position: absolute; + left: 450px; + top: 30px; + border: 1px black solid; + padding: 1px; + background-color: #eee; + cursor: pointer; + } +</style> + +<div style="position: relative"> + <span id="png_link" <span style="color: green">onclick="RGraph.showPNG(myCanvas, event)"</span>>Get PNG</span> + <canvas id="cvs" width="600" height="250">[No canvas support]</canvas> +</div> +</pre> + + <h4>Retrieving just the PNG URL</h4> + <p> + If you just want to get the PNG image URL - this can be done with the standard canvas function<i>.toDataUrl()</i>: + </p> + + <pre class="code">var myUrl = myCanvas.toDataURL();</pre> + + <p> + This gives you a data: URL which represents the canvas. Like <a href="javascript: location.href = line.canvas.toDataURL()">this</a>. + Because the URLs are very long there are some things that you should be aware of: + </p> + + <ul> + <li>Google Chrome shows the image, but doesn't show the URL in the address bar</li> + <li>MSIE9 can show the image using the context menu API (top) method, but not the stand-alone image.</li> + </ul> + +</body> +</html>
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