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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 ? 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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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