1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
|
<!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 - Making annotations shareable cross browser</title>
<meta name="keywords" content="rgraph html5 canvas chart docs annotating shareable cross browser" />
<meta name="description" content="RGraph: HTML5 Javascript charts library - Making annotations shareable cross browser" />
<meta property="og:title" content="RGraph: HTML5 Javascript charts library" />
<meta property="og:description" content="A chart 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="../images/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.annotate.js"></script>
<script src="../libraries/RGraph.common.context.js"></script>
<script src="../libraries/RGraph.line.js"></script>
<script>
/**
* The function that loads the annotations from the server
*/
function LoadAnnotations ()
{
var canvasPosition = RGraph.getCanvasXY(g.canvas);
var div = document.createElement('DIV');
div.style.backgroundColor = 'white';
div.style.padding = '3px';
div.style.position = 'absolute';
div.style.left = canvasPosition[0] + 5 + 'px';
div.style.top = canvasPosition[1] + 5 + 'px';
div.style.color = 'gray';
div.style.opacity = 1;
div.style.border = '2px solid black';
div.style.zIndex = 99;
div.innerHTML = 'Loading annotations...';
document.body.appendChild(div);
div2 = document.createElement('DIV');
div2.style.backgroundColor = 'gray';
div2.style.opacity = 0.5;
div2.style.position = 'absolute';
div2.style.left = canvasPosition[0] + 'px';
div2.style.top = canvasPosition[1] + 'px';
div2.style.width = g.canvas.width + 'px';
div2.style.height = g.canvas.height + 'px';
//div2.style.zIndex = 98;
document.body.appendChild(div2);
window.localStorage['__rgraph_annotations_cvs__'] = '';
AjaxGet('annotate_persist.html?getannotations=12',
function ()
{
if (this.readyState == 4 && this.status == 200) {
window.localStorage['__rgraph_annotations_cvs__'] = this.responseText;
RGraph.ReplayAnnotations(g);
setTimeout(function () {div.style.opacity = 0.8; div2.style.opacity = 0.4;}, 50);
setTimeout(function () {div.style.opacity = 0.6;div2.style.opacity = 0.3;}, 100);
setTimeout(function () {div.style.opacity = 0.4;div2.style.opacity = 0.2;}, 150);
setTimeout(function () {div.style.opacity = 0.2;div2.style.opacity = 0.1;}, 200);
setTimeout(function () {div.style.opacity = 0;div2.style.opacity = 0;}, 250);
setTimeout(function () {div.style.display = 'none';div2.style.display = 'none';}, 300);
}
}
);
}
/**
* The function that saves annotations to the server
*/
function SaveAnnotations ()
{
var canvasPosition = RGraph.getCanvasXY(g.canvas);
var div = document.createElement('DIV');
div.style.backgroundColor = 'white';
div.style.padding = '3px';
div.style.position = 'absolute';
div.style.left = canvasPosition[0] + 5 + 'px';
div.style.top = canvasPosition[1] + 5 + 'px';
div.style.color = 'gray';
div.style.opacity = 1;
div.style.border = '2px solid black';
div.style.zIndex = 99;
div.innerHTML = 'Saving annotations...';
document.body.appendChild(div);
AjaxPost('annotate_persist.html', 'data=' + window.localStorage['__rgraph_annotations_cvs__']);
setTimeout(function () {div.style.opacity = 0.8}, 50);
setTimeout(function () {div.style.opacity = 0.6}, 100);
setTimeout(function () {div.style.opacity = 0.4}, 150);
setTimeout(function () {div.style.opacity = 0.2}, 200);
setTimeout(function () {div.style.opacity = 0; div.style.display = 'none';}, 250);
}
/**
* Makes an AJAX POST.
*/
function AjaxPost (url, data)
{
// Mozilla, Safari, ...
if (window.XMLHttpRequest) {
var httpRequest = new XMLHttpRequest();
// MSIE
} else if (window.ActiveXObject) {
var httpRequest = new ActiveXObject("Microsoft.XMLHTTP");
}
//httpRequest.onreadystatechange = callback;
httpRequest.open('POST', url, true);
httpRequest.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
httpRequest.send(data);
}
/**
* Makes an AJAX call. It calls the given callback (a function) when ready
*
* @param string url The URL to retrieve
* @param function callback A function object that is called when the response is ready, there's an example below
* called "myCallback".
*/
function AjaxGet (url, callback)
{
// Mozilla, Safari, ...
if (window.XMLHttpRequest) {
var httpRequest = new XMLHttpRequest();
// MSIE
} else if (window.ActiveXObject) {
var httpRequest = new ActiveXObject("Microsoft.XMLHTTP");
}
httpRequest.onreadystatechange = callback;
httpRequest.open('GET', url, true);
httpRequest.send();
}
window.onload = function (e)
{
/**
* This clears the locally stored annotations so that they can be loaded from server
*/
window.localStorage['__rgraph_annotations_cvs__'] = '';
g = new RGraph.Line('cvs', [5,6,3,4,8,6,7,5,9]);
g.Set('chart.tickmarks', 'endcircle');
g.Set('chart.hmargin', 5);
g.Set('chart.annotatable', true);
g.Set('chart.labels', ['Ben','Olga','Jeff','Indigo','Kev','Pete','Lou','Fred','John']);
g.Set('chart.contextmenu', [['Show palette', RGraph.Showpalette], ['Clear', function () {RGraph.Clear(g.canvas);g.Draw();}]]);
g.Set('chart.shadow', true);
g.Set('chart.linewidth', 1.01);
g.Set('chart.ylabels.count', 10);
g.Draw();
LoadAnnotations();
RGraph.AddCustomEventListener(g, 'onannotateend', function (obj) {SaveAnnotations();});
RGraph.AddCustomEventListener(g, 'onannotateclear', function (obj) {SaveAnnotations();});
}
</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>
>
Cross-browser annotations
</div>
<h1>RGraph: <span>HTML5 Javascript charts library</span> - Making annotations shareable cross browser</h1>
<div style="text-align: center">
<div class="warning" style="display: inline-block">
This example does not work offline - you must use a website. Annotations are removed every five minutes.
</div>
</div>
<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>
<p>
Combining a little AJAX and some very simple server side scripting, you can easily make an annotation system that can persist
across different browsers and computers. You an either use Load/Save buttons to trigger the loading and saving, or like the
example to the right you can make use of the custom RGraph onannotateend event to make it happen automatically.
</p>
<p>
This simple example uses a small PHP server side script that loads and saves the annotation data to a file on the server,
and that looks like this:
</p>
<br clear="all" />
<pre class="code">
<?php
$file = '/tmp/annotation_data';
/**
* Save the annotations to a tmp file
*/
if (isset($_POST) && isset($_POST['data'])) {
file_put_contents($file, $_POST['data']);
exit;
}
/**
* Load the annotations
*/
if (!empty($_GET['getannotations']) && $_GET['getannotations'] == 1) {
$contents = file_get_contents($file);
print($contents);
exit;
}
?>
</pre>
<p>
By making the Javascript Save/Load functions repeat themselves every few seconds, you could easily make a presentation/demo system
that can be used when paticipants are in differing locations - in a similar fashion to Google Docs - or when you want one persons
annotations to be viewable by multiple PCs. On this page though, the Save function is triggered by the custom RGraph event
<i>onannotateend</i>.
</p>
</body>
</html>
|
