source: Dev/trunk/RGraph/docs/annotating.html @ 249

Last change on this file since 249 was 77, checked in by fpvanagthoven, 14 years ago

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21    <title>RGraph: Javascript charts and graph library - Annotating your charts</title>
22   
23    <meta name="keywords" content="rgraph html5 canvas chart docs annotating" />
24    <meta name="description" content="RGraph: Javascript charts and graph library - Documentation about annotating your charts" />
25   
26    <meta property="og:title" content="RGraph: Javascript charts and graph library" />
27    <meta property="og:description" content="A chart library based on the HTML5 canvas tag" />
28    <meta property="og:image" content="http://www.rgraph.net/images/logo.png"/>
29
30    <link rel="stylesheet" href="../css/website.css" type="text/css" media="screen" />
31    <link rel="icon" type="image/png" href="../images/favicon.png">
32   
33    <script src="../libraries/RGraph.common.core.js" ></script>
34    <script src="../libraries/RGraph.common.annotate.js" ></script>
35    <script src="../libraries/RGraph.common.context.js" ></script>
36    <script src="../libraries/RGraph.common.zoom.js" ></script>
37    <script src="../libraries/RGraph.bar.js" ></script>
38    <!--[if IE 8]><script src="../excanvas/excanvas.original.js"></script><![endif]-->
39   
40    <script>
41        window.onload = function ()
42        {
43            bar = new RGraph.Bar('myBar', [[45,64],[32,51],[41,52],[54,43],[43,50]]);
44            bar.Set('chart.title', 'An annotatable chart with context menu');
45            bar.Set('chart.labels', ['John','Fred', 'Barry', 'Charlie', 'Joan']);
46            bar.Set('chart.colors', ['red', 'blue']);
47            bar.Set('chart.background.barcolor1', '#fff');
48            bar.Set('chart.background.barcolor2', '#fff');
49            bar.Set('chart.annotatable', true);
50            bar.Set('chart.contextmenu', [['Show palette', RGraph.Showpalette], ['Clear', function () {RGraph.Clear(bar.canvas); bar.Draw();}]]);
51            bar.Draw();
52           
53            RGraph.AddCustomEventListener(bar, 'onannotatestart', function (obj) {cl('Started annotating: ' + obj.id);});
54            RGraph.AddCustomEventListener(bar, 'onannotate', function (obj) {cl('Annotating: ' + obj.id);});
55            RGraph.AddCustomEventListener(bar, 'onannotateend', function (obj) {cl('Finished annotating: ' + obj.id);});
56            RGraph.AddCustomEventListener(bar, 'onannotatecolor', function (obj) {cl('Changed annotate color: ' + obj.Get('chart.annotate.color'));});
57            RGraph.AddCustomEventListener(bar, 'onannotateclear', function (obj) {cl('Fired the annotation clear event');});
58        }
59    </script>
60
61
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73</head>
74<body>
75
76   
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90
91    <div id="breadcrumb">
92        <a href="../index.html">RGraph: Javascript charts and graph library</a>
93        >
94        <a href="index.html">Documentation</a>
95        >
96        Annotating your charts
97    </div>
98
99    <h1>RGraph: <span>Javascript charts and graph library</span> - Annotating your charts</h1>
100
101    <script>
102        if (RGraph.isIE8()) {
103            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. Click <a href="http://support.rgraph.net/message/rgraph-in-internet-explorer-9.html" target="_blank">here</a> to see some screenshots.</div>');
104        }
105    </script>
106
107    <div style="float: right">
108        <canvas id="myBar" width="400" height="200">[No canvas support]</canvas><br />
109    </div>
110
111    <p>
112        The annotations feature brings presentation style functionality to RGraph charts. You can use this feature
113        for highlighting your charts if you need to.
114    </p>
115   
116    <ul>
117        <li><a href="#how">How do annotations work?</a></li>
118        <li><a href="#browser">Browser support</a></li>
119        <li><a href="#what">What can I use annotations for?</a></li>
120        <li><a href="#persistent">Are annotations persistent?</a></li>
121        <li><a href="#palette">How do I show the mini-palette?</a></li>
122        <li><a href="#clear">How can I clear the annotations?</a></li>
123        <li><a href="#replay">Replaying annotations when they're off</a></li>
124        <li><a href="#persist">Making your annotations persist</a></li>
125    </ul>
126
127    <a name="how"></a>
128    <h4>How do annotations work?</h4>
129   
130    <p>
131        Enabling annotations is a very simple affair, and consists of doing the following:
132    </p>
133   
134    <pre class="code" style="width: 55%">myGraph.Set('chart.annotatable', true);</pre>
135
136    <a name="browser"></a>
137    <h4>Browser support</h4>
138
139    <p>
140        Annotations are supported in all browsers that RGraph works with - Firefox 3.5+, Chrome 2+, Safari 4+, Opera 10.5+ and
141        MSIE/Google Chrome Frame. They DO NOT however work with MSIE 8/ExCanvas.
142    </p>
143
144    <a name="what"></a>
145    <h4>What can I use annotations for?</h4>
146   
147    <p>
148        As mentioned you can use it for presentations, highlighting things to yourself or others or just to have fun drawing (!).
149    </p>
150   
151    <a name="persistent"></a>
152    <h4>Are annotations persistent?</h4>
153   
154    <p>
155        That depends on which browser you're using. The annotation data is stored in the users web browser (not on the web server),
156        meaning currently (21st March 2010) browser support is limited to Firefox 3.5+, Safari 4+,
157        Chrome 4+ and Opera 10.5+. MSIE 8 also has the required storage capabilities, but since it doesn't yet support canvas, the point is moot.
158        The user does not have to
159        confirm anything for storage to be allowed - try it out on this page by drawing on the chart and then refreshing the page.
160    </p>
161   
162    <a name="palette"></a>
163    <h4>How do I show the mini-palette?</h4>
164
165
166    <p>
167        You can show the palette by using the <i>RGraph.Showpalette</i> function shown below as a context menu item:
168    </p>
169   
170    <pre class="code">
171myObj.Set('chart.contextmenu', [
172                                ['Show palette', RGraph.Showpalette],
173                                ['Clear', function () {RGraph.Clear(myObj.canvas); myObj.Draw();}]
174                               ]);
175</pre>
176
177    <p>
178        This code will result in the same context menu as the chart above.
179    </p>
180
181    <a name="clear"></a>
182    <h4>How can I clear the annotations?</h4>
183
184    You can simply clear the chart and redraw it:
185   
186    <pre class="code">RGraph.Clear(myGraph.canvas); // Clear the chart
187myGraph.Draw();               // Redraw it</pre>
188
189    <p>
190        In the chart above, there is a context menu that allows you to both clear the chart and also demonstrates the mini-palette
191        feature available to you.
192    </p>
193
194    <a name="replay"></a>
195    <h4>Replaying annotations when they're off</h4>   
196        <p>
197            When annotations are not enabled, any prior annotations that may have been made are not displayed. To show them you need
198            to use the API function <i>RGraph.ReplayAnnotations(object)</i> after the call to .Draw().
199        </p>
200   
201    <a name="persist"></a>
202    <h4>Making your annotations persist  across browsers/computers</h4>
203        <p>
204            With a little bit of custom Javascript and some server side scripting you can make your annotations persist across
205            different browsers/computers. You can find an example of this <a href="annotate_persist.html"><b>here</b></a>.
206        </p>
207
208</html>
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