init repo
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nikolay ivanov
194
OfficeWeb/sdk/Common/Charts/docs/png.html
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194
OfficeWeb/sdk/Common/Charts/docs/png.html
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<!DOCTYPE html>
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<html>
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<head>
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<meta http-equiv="X-UA-Compatible" content="chrome=1">
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<!--
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/**
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* o------------------------------------------------------------------------------o
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* | This file is part of the OfficeExcel package - you can learn more at: |
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* | |
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* | http://www.OfficeExcel.net |
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* | |
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* | This package is licensed under the OfficeExcel license. For all kinds of business |
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* | purposes there is a small one-time licensing fee to pay and for non |
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* | commercial purposes it is free to use. You can read the full license here: |
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* | |
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* | http://www.OfficeExcel.net/LICENSE.txt |
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* o------------------------------------------------------------------------------o
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*/
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-->
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<title>How to retrieve a PNG of your chart</title>
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<meta name="keywords" content="OfficeExcel html5 canvas charts docs png image" />
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<meta name="description" content="Documentation about how to retrieve a PNG representation of your chart" />
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<meta name="googlebot" content="NOODP">
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<meta property="og:title" content="OfficeExcel: HTML5 Javascript charts library" />
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<meta property="og:description" content="A charts library based on the HTML5 canvas tag" />
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<meta property="og:image" content="http://www.OfficeExcel.net/images/logo.jpg"/>
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<link rel="stylesheet" href="../css/website.css" type="text/css" media="screen" />
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<link rel="icon" type="image/png" href="/favicon.png">
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<!-- Place this tag in your head or just before your close body tag -->
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<script type="text/javascript" src="https://apis.google.com/js/plusone.js"></script>
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<script src="../libraries/OfficeExcel.common.core.js" ></script>
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<script src="../libraries/OfficeExcel.common.context.js" ></script>
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<script src="../libraries/OfficeExcel.line.js" ></script>
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<!--[if lt IE 9]><script src="../excanvas/excanvas.original.js"></script><![endif]-->
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<script>
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window.onload = function ()
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{
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line = new OfficeExcel.Line('cvs', [4,3,7,4,5,6,7,4,8,9]);
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line.Set('chart.labels', ['Dez', 'Fliss','Geoff','Hoolio','John','Rich','Kev','Charles','Lou','Bob']);
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line.Set('chart.hmargin', 5);
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line.Set('chart.title', 'Retrieving a PNG of your chart (context menu)');
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line.Set('chart.title.vpos', 0.5);
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line.Set('chart.tickmarks', 'endcircle');
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if (!OfficeExcel.isOld()) {
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line.Set('chart.contextmenu', [
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['Get PNG', OfficeExcel.showPNG],
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null,
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['Cancel', function () {}]
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]);
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}
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line.Set('chart.linewidth', 2);
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line.Set('chart.shadow', true);
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line.Set('chart.shadow.offsetx', 0);
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line.Set('chart.shadow.offsety', 0);
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line.Set('chart.shadow.blur', 15);
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line.Set('chart.shadow.color', 'red');
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OfficeExcel.Clear(line.canvas, 'white'); // This effectively sets the background color to be white
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line.Draw();
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}
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</script>
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<?php PrintAnalyticsCode() ?>
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</head>
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<body>
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<!-- Social networking buttons -->
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<?php
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$prefix = substr($_SERVER['SERVER_NAME'], 0, 3);
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require("/OfficeExcel.{$prefix}/social.html");
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?>
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<!-- Social networking buttons -->
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<div id="breadcrumb">
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<a href="../index.html">OfficeExcel: HTML5 Javascript charts library</a>
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>
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<a href="./index.html">Documentation</a>
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>
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Retrieving a PNG of your chart
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</div>
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<h1>Retrieving <span>a PNG of your chart</span></h1>
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<script>
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if (OfficeExcel.isOld()) {
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document.write('<div style="background-color: #fee; border: 2px dashed red; padding: 5px"><b>Important</b><br /><br /> Internet Explorer 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 OfficeExcel 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>');
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}
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</script>
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<style>
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span#png_link {
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position: absolute;
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left: 535px;
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top: 30px;
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border: 1px black solid;
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padding: 1px;
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background-color: white;
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cursor: pointer;
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color: blue;
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font-size: 10pt;
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border: 2px solid gray;
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border-radius: 5px;
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font-weight: bold;
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font-family: Arial;
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}
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</style>
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<div style="position: relative">
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<span id="png_link" onclick="OfficeExcel.showPNG(document.getElementById('cvs'), event);">PNG</span>
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<canvas id="cvs" width="600" height="250" style="float: left">[No canvas support]</canvas>
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</div>
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<p>
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OfficeExcel provides an easy way to get a PNG image of your chart. This allows you to
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easily save the image locally to use in (for example) a document, spreadsheet or presentation.
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</p>
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<p>
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Originally, the function was designed to be used with a context menu, so it is located in the <i>OfficeExcel.common.context.js</i>.
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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
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example of its usage on the first <a href="../examples/radar.html">Radar example</a href>.
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</p>
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<br clear="all" />
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<p>Include the context menu code:</p>
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<pre class="code"><script src="../libraries/OfficeExcel.common.context.js" ></script></pre>
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<p>Add the context menu:</p>
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<pre class="code">
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myGraph.Set('chart.contextmenu', [
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<span style="color: green">['Get PNG', OfficeExcel.showPNG]</span>,
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null,
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['Cancel', function () {}]
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]);</pre>
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<h4>Using the function without a context menu</h4>
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<p>
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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
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the canvas into the function as an argument, along with the event object.
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</p>
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<pre class="code">
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<!-- This CSS positions the link over the top right of the canvas -->
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<style>
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span#png_link {
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position: absolute;
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left: 450px;
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top: 30px;
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border: 1px black solid;
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padding: 1px;
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background-color: #eee;
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cursor: pointer;
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}
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</style>
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<div style="position: relative">
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<span id="png_link" <span style="color: green">onclick="OfficeExcel.showPNG(myCanvas, event)"</span>>Get PNG</span>
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<canvas id="cvs" width="600" height="250">[No canvas support]</canvas>
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</div>
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</pre>
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<h4>Retrieving just the PNG URL</h4>
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<p>
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If you just want to get the PNG image URL - this can be done with the standard canvas function<i>.toDataUrl()</i>:
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</p>
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<pre class="code">var myUrl = myCanvas.toDataURL();</pre>
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<p>
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This gives you a data: URL which represents the canvas. Like <a href="javascript: location.href = line.canvas.toDataURL()">this</a>.
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Because the URLs are very long there are some things that you should be aware of:
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</p>
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<ul>
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<li>Google Chrome shows the image, but doesn't show the URL in the address bar</li>
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<li>MSIE9 can show the image using the context menu API (top) method, but not the stand-alone image.</li>
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</ul>
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</body>
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</html>
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