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21	<title>RGraph: Javascript charts and graph library - Pie charts documentation</title>
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62	<div id="breadcrumb">
63	<a href="../index.html">RGraph: Javascript charts and graph library</a>
64	>
65	<a href="index.html">Documentation</a>
66	>
67	Pie charts
68	</div>
69
70	<h1>RGraph: <span>Javascript charts and graph library</span> - Pie charts documentation</h1>
71
72	<script>
73	if (RGraph.isIE8()) {
74	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>');
75	}
76	</script>
77
78	<p>
79	The pie chart can be used, for example, to represent something that is akin to percentages. ie A set of data that
80	should be taken as part of a whole.
81	</p>
82
83	<p>
84	The example file is <a href="../examples/pie.html">here</a>.
85	</p>
86
87	<pre class="code">
88	<script>
89	window.onload = function ()
90	{
91	var data = [564,155,499,611,322];
92
93	var pie = new RGraph.Pie('myPie', data);
94	pie.Set('chart.labels', ['Abc', 'Def', 'Ghi', 'Jkl', 'Mno']);
95	pie.Set('chart.linewidth', 5);
96	pie.Set('chart.stroke', '#fff');
97	pie.Draw();
98	}
99	</script>
100	</pre>
101
102	<a name="available.properties"></a>
103	<ul>
104	<li><a href="#available.properties">Properties</a></li>
105	<li><a href="#available.methods">Methods</a></li>
106	</ul>
107
108	<h2>Properties</h2>
109
110	<p>
111	You can use these properties to control how the pie chart looks. You can set them by using the Set() method. Eg:
112	</p>
113
114	<p>
115	<b>myPie.Set('name', 'value');</b>
116	</p>
117
118	<ul>
119	<li><a href="#margins">Margins</a></li>
120	<li><a href="#colors">Colors</a></li>
121	<li><a href="#labels and text">Labels and text</a></li>
122	<li><a href="#titles">Titles</a></li>
123	<li><a href="#shadows">Shadows</a></li>
124	<li><a href="#interactive features">Interactive features</a></li>
125	<li><a href="#key">Key</a></li>
126	<li><a href="#zoom">Zoom</a></li>
127	<li><a href="#scale">Scale</a></li>
128	<li><a href="#miscellaneous">Miscellaneous</a></li>
129	</ul>
130
131
132	<a name="margins"></a>
133	<h3 style="border: 1px solid #aaa; background-color: #eee; font-style: italic; padding: 5px; -moz-border-radius: 10px; -webkit-border-radius: 10px; border-radius: 10px">Margins</h3>
134
135
136
137	<a name="chart.gutter.left"></a>
138	<b>chart.gutter.left</b><br />
139	The left gutter of the chart, (the gutter is where the labels and title are)).<br />
140	<i>Default: 25</i><br /><br />
141
142	<a name="chart.gutter.right"></a>
143	<b>chart.gutter.right</b><br />
144	The right gutter of the chart, (the gutter is where the labels and title are).<br />
145	<i>Default: 25</i><br /><br />
146
147	<a name="chart.gutter.top"></a>
148	<b>chart.gutter.top</b><br />
149	The top gutter of the chart, (the gutter is where the labels and title are).<br />
150	<i>Default: 25</i><br /><br />
151
152	<a name="chart.gutter.bottom"></a>
153	<b>chart.gutter.bottom</b><br />
154	The bottom gutter of the chart, (the gutter is where the labels and title are).<br />
155	<i>Default: 25</i><br /><br />
156
157	<a name="colors"></a>
158	<h3 style="border: 1px solid #aaa; background-color: #eee; font-style: italic; padding: 5px; -moz-border-radius: 10px; -webkit-border-radius: 10px; border-radius: 10px">Colors</h3> <a name="chart.colors"></a>
159	<b>chart.colors</b><br />
160	Colors to be used for the pie segments. <br /><i>Default: ['rgb(255,0,0)', '#ddd', 'rgb(0,255,0)', 'rgb(0,0,255)', 'rgb(255,255,0)', 'rgb(0,255,255)', 'red', 'pink', 'black', 'white']</i><br /><br />
161	<a name="chart.strokestyle"></a>
162	<b>chart.strokestyle</b><br />
163	The color of the seperating lines. By setting this to your background color, and setting the linewidth to approx. 5, it will make the pie chart look "exploded". <br /><i>Default: #999</i><br /><br />
164	<a name="labels and text"></a>
165	<h3 style="border: 1px solid #aaa; background-color: #eee; font-style: italic; padding: 5px; -moz-border-radius: 10px; -webkit-border-radius: 10px; border-radius: 10px">Labels and text</h3> <a name="chart.text.size"></a>
166	<b>chart.text.size</b><br />
167	The size of the text (in points). <br /><i>Default: 10</i><br /><br />
168	<a name="chart.text.font"></a>
169	<b>chart.text.font</b><br />
170	The font used to render the text.<br /><i>Default: Verdana</i><br /><br />
171	<a name="chart.text.color"></a>
172	<b>chart.text.color</b><br />
173	The color of the labels. <br /><i>Default: black</i><br /><br />
174	<a name="chart.labels"></a>
175	<b>chart.labels</b><br />
176	An array of labels to be used for the chart. <br /><i>Default: [] (an empty array)</i><br /><br />
177	<a name="chart.labels.sticks"></a>
178	<b>chart.labels.sticks</b><br />
179	Stipulates that small sticks for the labels are shown. The <a href="../examples/pie.html">example page</a> has an example of this.<br /><i>Default: false</i><br /><br />
180	<a name="chart.labels.sticks.color"></a>
181	<b>chart.labels.sticks.color</b><br />
182	Sets the color of the label sticks.<br /><i>Default: #aaa</i><br /><br />
183	<a name="titles"></a>
184	<h3 style="border: 1px solid #aaa; background-color: #eee; font-style: italic; padding: 5px; -moz-border-radius: 10px; -webkit-border-radius: 10px; border-radius: 10px">Titles</h3> <a name="chart.title"></a>
185	<b>chart.title</b><br />
186	The title of the pie chart. <br /><i>Default: none</i><br /><br />
187
188	<a name="chart.title.background"></a>
189	<b>chart.title.background</b><br />
190	The background color (if any) for the title.<br />
191	<i>Default: null</i><br /><br />
192
193	<a name="chart.title.color"></a>
194	<b>chart.title.color</b><br />
195	The color of the title.<br /> <i>Default: black</i><br /><br />
196	<a name="chart.title.hpos"></a>
197	<b>chart.title.hpos</b><br />
198	This allows you to completely override the horizontal positioning of the title. It should be a number between 0 and 1, and is multiplied with the whole width of the canvas and then used as the horizontal position. <br /><i>Default: null</i><br /><br />
199	<a name="chart.title.vpos"></a>
200	<b>chart.title.vpos</b><br />
201	This allows you to completely override the vertical positioning of the title. It should be a number between 0 and 1, and is multiplied with the gutter and then used as the vertical position. It can be useful if you need to have a large gutter.<br /><i>Default: null</i><br /><br />
202	<a name="shadows"></a>
203	<h3 style="border: 1px solid #aaa; background-color: #eee; font-style: italic; padding: 5px; -moz-border-radius: 10px; -webkit-border-radius: 10px; border-radius: 10px">Shadows</h3> <a name="chart.shadow"></a>
204	<b>chart.shadow</b><br />
205	Whether a simple shadow effect is applied. <br /><i>Default: false</i><br /><br />
206	<a name="chart.shadow.color"></a>
207	<b>chart.shadow.color</b><br />
208	The color of the shadow. <br /> <i>Default: rgba(0,0,0,0.5)</i><br /><br />
209	<a name="chart.shadow.blur"></a>
210	<b>chart.shadow.blur</b><br />
211	The severity of the shadow blurring effect. <br /> <i>Default: 3</i><br /><br />
212	<a name="chart.shadow.offsetx"></a>
213	<b>chart.shadow.offsetx</b><br />
214	The X offset of the shadow.<br /><i>Default: 3</i><br /><br />
215	<a name="chart.shadow.offsety"></a>
216	<b>chart.shadow.offsety</b><br />
217	The Y offset of the shadow.<br /><i>Default: 3</i><br /><br />
218	<a name="interactive features"></a>
219	<h3 style="border: 1px solid #aaa; background-color: #eee; font-style: italic; padding: 5px; -moz-border-radius: 10px; -webkit-border-radius: 10px; border-radius: 10px">Interactive features</h3>
220
221	<a name="chart.tooltips"></a>
222	<b>chart.tooltips</b><br />
223	An array of tooltips, starting from the middle right (ie east) axis, and going clockwise sequentially.<br />
224	<i>Default: [] (An empty array)</i><br /><br />
225
226	<a name="chart.tooltips.event"></a>
227	<b>chart.tooltips.event</b><br />
228	This can be <i>onclick</i> or <i>onmousemove</i> and determines which event is used for tooltips.<br />
229	<i>Default: onclick</i><br /><br />
230
231	<a name="chart.tooltips.effect"></a>
232	<b>chart.tooltips.effect</b><br />
233	The animated effect used for showing tooltips. Can be either <i>fade</i> or <i>expand</i>.<br />
234	<i>Default: fade</i><br /><br />
235
236	<a name="chart.tooltips.css.class"></a>
237	<b>chart.tooltips.css.class</b><br />
238	This is the name of the CSS class the chart uses.<br />
239	<i>Default: RGraph_tooltip</i><br /><br />
240
241	<a name="chart.tooltips.override"></a>
242	<b>chart.tooltips.override</b><br />
243	If you wish to handle showing tooltips yourself, this should be a function object which does just that. There's more
244	information on the <a href="tooltips.html">tooltips documentation page</a><br />
245	<i>Default: null</i><br /><br />
246
247
248	<a name="chart.contextmenu"></a>
249	<b>chart.contextmenu</b><br />
250	An array of context menu items. More information on context menus is <a href="context.html">here</a>.<br /><i>Default: [] (An empty array)</i><br /><br />
251	<a name="chart.annotatable"></a>
252	<b>chart.annotatable</b><br />
253	Whether annotations are enabled for the chart (ie you can draw on the chart interactively.<br /><i>Default: false</i><br /><br />
254	<a name="chart.annotate.color"></a>
255	<b>chart.annotate.color</b><br />
256	If you do not allow the use of the palette, then this will be the only colour allowed for annotations.<br /><i>Default: black</i><br /><br />
257
258
259
260	<a name="chart.resizable"></a>
261	<b>chart.resizable</b><br />
262	Defaulting to false, this determines whether your chart will be resizable. Because of the numerous event handlers this has to install code on, This feature is unlikely to work with other dynamic features (the context menu is fine however).<br />
263	<i>Default: false</i><br /><br />
264
265
266	<a name="chart.resize.handle.background"></a>
267	<b>chart.resize.handle.background</b><br />
268	With this you can specify the background color for the resize handle. If you're adjusting the position of the
269	handle then you may need this to make the handle stand out more.<br />
270	<i>Default: null</i><br /><br />
271
272
273
274
275
276	<a name="key"></a>
277	<h3 style="border: 1px solid #aaa; background-color: #eee; font-style: italic; padding: 5px; -moz-border-radius: 10px; -webkit-border-radius: 10px; border-radius: 10px">Key</h3>
278
279	<a name="chart.key"></a>
280	<b>chart.key</b><br />
281	An array of key information. <br />
282	<i>Default: [] (An empty array)</i><br /><br />
283
284	<a name="chart.key.background"></a>
285	<b>chart.key.background</b><br />
286	The color of the key background. Typically white, you could set this to something like rgba(255,255,255,0.7) to allow people to see things behind it.<br>
287	<i>Default: white</i><br /><br />
288
289	<a name="chart.key.halign"></a>
290	<b>chart.key.halign</b><br />
291	Instead of specifying the exact x/y coordinates, you can use this property to simply specify whether the key hould be
292	aligned <i>left</i> or <i>right</i>.<br />
293	<i>Default: right</i><br /><br />
294
295	<a name="chart.key.position"></a>
296	<b>chart.key.position</b><br />
297	Determines the position of the key.Either <b>graph</b> (default), or <b>gutter</b>.<br />
298	<i>Default: graph</i><br /><br />
299
300	<b>chart.key.position.x</b><br />
301	This allows you to specify a specific X coordinate for the key.<br />
302	<i>Default: null</i><br /><br />
303
304	<b>chart.key.position.y</b><br />
305	This allows you to specify a specific Y coordinate for the key.<br />
306	<i>Default: null</i><br /><br />
307
308	<b>chart.key.position.gutter.boxed</b><br />
309	If you have the key in gutter mode (ie horizontal), this allows you to give a background color.<br />
310	<i>Default: true</i><br /><br />
311
312	<a name="chart.key.shadow"></a>
313	<b>chart.key.shadow</b><br />
314	Whether a small drop shadow is applied to the key.<br />
315	<i>Default: false</i><br /><br />
316
317	<a name="chart.key.shadow.color"></a>
318	<b>chart.key.shadow.color</b><br />
319	The color of the shadow.<br />
320	<i>Default: #666</i><br /><br />
321
322	<a name="chart.key.shadow.blur"></a>
323	<b>chart.key.shadow.blur</b><br />
324	The extent of the blurring effect used on the shadow.<br />
325	<i>Default: 3</i><br /><br />
326
327	<a name="chart.key.shadow.offsetx"></a>
328	<b>chart.key.shadow.offsetx</b><br />
329	The X offset of the shadow.<br />
330	<i>Default: 2</i><br /><br />
331
332	<a name="chart.key.shadow.offsety"></a>
333	<b>chart.key.shadow.offsety</b><br />
334	The Y offset of the shadow.<br />
335	<i>Default: 2</i><br /><br />
336
337	<b>chart.key.rounded</b><br />
338	This controls whether the corners of the key (in graph mode) are curved. If the key is gutter mode, this has no effect.<br />
339	<i>Default: false</i><br /><br />
340
341	<b>chart.key.color.shape</b><br />
342	This can be <i>square</i>, <i>circle</i> or <i>line</i> and controls how the color indicators in the key appear.<br />
343	<i>Default: square</i><br /><br />
344
345	<b>chart.key.linewidth</b><br />
346	The line width of the surrounding border on the key.<br />
347	<i>Default: 1</i><br /><br />
348
349
350
351	<a name="zoom"></a>
352	<h3 style="border: 1px solid #aaa; background-color: #eee; font-style: italic; padding: 5px; -moz-border-radius: 10px; -webkit-border-radius: 10px; border-radius: 10px">Zoom</h3> <a name="chart.zoom.mode"></a>
353	<b>chart.zoom.mode</b><br />
354	Can be used to control whether the zoom is in thumbnail or canvas mode. Possible values are: <i>thumbnail</i> and <i>canvas</i>.<br /><i>Default: canvas</i><br /><br />
355	<a name="chart.zoom.factor"></a>
356	<b>chart.zoom.factor</b><br />
357	This is the factor that the chart will be zoomed by (bigger values means more zoom)<br /><i>Default: 1.5</i><br /><br />
358	<a name="chart.zoom.fade.in"></a>
359	<b>chart.zoom.fade.in</b><br />
360	Whether the zoomed canvas fades in or not. This also can be used to control the fade in for the zoom in thumbnail mode.<br /><i>Default: true</i><br /><br />
361	<a name="chart.zoom.fade.out"></a>
362	<b>chart.zoom.fade.out</b><br />
363	Whether the zoomed canvas fades out or not. This also can be used to control the fade in for the zoom in thumbnail mode.<br /><i>Default: true</i><br /><br />
364	<a name="chart.zoom.hdir"></a>
365	<b>chart.zoom.hdir</b><br />
366	The horizontal direction of the zoom. Possible values are: <i>left</i>, <i>center</i>, <i>right</i><br /><i>Default: right</i><br /><br />
367	<a name="chart.zoom.vdir"></a>
368	<b>chart.zoom.vdir</b><br />
369	The vertical direction of the zoom. Possible values are: <i>up</i>, <i>center</i>, <i>down</i><br /><i>Default: down</i><br /><br />
370	<a name="chart.zoom.delay"></a>
371	<b>chart.zoom.delay</b><br />
372	The delay (in milliseconds) between frames.<br /><i>Default: 50</i><br /><br />
373	<a name="chart.zoom.frames"></a>
374	<b>chart.zoom.frames</b><br />
375	The number of frames in the zoom animation.<br /><i>Default: 10</i><br /><br />
376	<a name="chart.zoom.shadow"></a>
377	<b>chart.zoom.shadow</b><br />
378	Whether or not the zoomed canvas has a shadow or not.<br /><i>Default: true</i><br /><br />
379	<a name="chart.zoom.thumbnail.width"></a>
380	<b>chart.zoom.thumbnail.width</b><br />
381	When the zoom is in thumbnail mode, this is the width (in pixels) of the thumbnail.<br /><i>Default: 75</i><br /><br />
382	<a name="chart.zoom.thumbnail.height"></a>
383	<b>chart.zoom.thumbnail.height</b><br />
384	When the zoom is in thumbnail mode, this is the height (in pixels) of the thumbnail.<br /><i>Default: 75</i><br /><br />
385	<a name="chart.zoom.background"></a>
386	<b>chart.zoom.background</b><br />
387	Defaulting to true, this determines whether the zoom has a dark, semi-opaque background that covers the entire web page.<br /><i>Default: true</i><br /><br />
388	<a name="scale"></a>
389	<h3 style="border: 1px solid #aaa; background-color: #eee; font-style: italic; padding: 5px; -moz-border-radius: 10px; -webkit-border-radius: 10px; border-radius: 10px">Scale</h3>
390
391
392	<a name="miscellaneous"></a>
393	<h3 style="border: 1px solid #aaa; background-color: #eee; font-style: italic; padding: 5px; -moz-border-radius: 10px; -webkit-border-radius: 10px; border-radius: 10px">Miscellaneous</h3> <a name="chart.align"></a>
394	<b>chart.align</b><br />
395	Whether to left, center or right align the pie chart.<br /><i>Default: center</i><br /><br />
396	<a name="chart.linewidth"></a>
397	<b>chart.linewidth</b><br />
398	By setting this to roughly 5, and setting the strokestyle to the same colour as your background colour,you will get a segment separation effect.<br /><i>Default: 1</i><br /><br />
399
400	<a name="chart.variant"></a>
401	<b>chart.variant</b><br />
402	This can be either <i>pie</i> (the default) or <i>donut</i>. Setting this to <i>donut</i> is how you get a
403	donut chart.<br />
404	<i>Default: pie</i><br /><br />
405
406	<a name="chart.variant.donut.color"></a>
407	<b>chart.variant.donut.color</b><br />
408	This is the color of the center of the Donut chart.<br />
409	<i>Default: white</i><br /><br />
410
411	<a name="chart.value.text"></a>
412	<b>chart.value.text</b><br />
413	Set this to true if you want the value displayed in text beow the center of the pointer.<br /><i>Default: false</i><br /><br />
414
415	<a name="chart.highlight.style"></a>
416	<b>chart.highlight.style</b><br />
417	Can be either <i>explode</i>, <i>2d</i> or <i>3d</i> and determines which style of segment highlighting is used in
418	conjunction with tooltips.<br />
419	<i>Default: 2d</i><br /><br />
420
421	<a name="chart.highlight.style.2d.fill"></a>
422	<b>chart.highlight.style.2d.fill</b><br />
423	When 2D highlighting for tooltips is used, this controls the color of the highlighting. The former name for this property was
424	<i>chart.highlight.style.2d.color</i>.<br />
425	<i>Default: rgba(255,255,255,0.5)</i><br /><br />
426
427	<a name="chart.highlight.style.2d.stroke"></a>
428	<b>chart.highlight.style.2d.stroke</b><br />
429	When 2D highlighting for tooltips is used, this controls the stroke color of the highlighting.<br />
430	<i>Default: rgba(255,255,255,0)</i><br /><br />
431
432	<a name="chart.explode"></a>
433	<b>chart.explode</b><br />
434	This can either be an array with the same number of elements as segments, or a single number, in which case every
435	segment will be exploded that amount. If it's an array then only those segments will be exploded - eg <i>[0,5,0,0]</i><br />
436	<i>Default: [] (an empty array)</i><br /><br />
437	</div>
438
439	<a name="available.methods"></a>
440	<br /> <br />
441	<h2>Methods</h2>
442
443	<b>obj.getSegment()</b><br /><br />
444
445	obj.getSegment() makes it easy to determine which segment of the Pie chart was clicked on. It provides:
446
447	<ul>
448	<li>Originating X coordinate</li>
449	<li>Originating Y coordinate</li>
450	<li>The radius of the segment</li>
451	<li>The starting angle (in degrees)</li>
452	<li>The ending angle (in degrees)</li>
453	<li>The zero-indexed segment number</li>
454	</ul>
455
456	<pre class="code">
457	<script>
458	RGraph.Register(myGraph);
459
460	myGraph.canvas.onclick = function (e)
461	{
462	RGraph.FixEventObject(e);
463	RGraph.Redraw();
464
465	var canvas = e.target;
466	var context = canvas.getContext('2d');
467	var obj = canvas.__object__;
468	<span style="color: green">var segment = obj.getSegment(e);</span>
469
470	if (segment) {
471	context.fillStyle = 'rgba(255,255,255,0.5)';
472	context.beginPath();
473
474	// Angles are provided in degrees, so convert them to radians
475	segment[3] /= 57.29;
476	segment[4] /= 57.29;
477
478	context.moveTo(segment[0], segment[1]);
479	context.arc(segment[0], segment[1], segment[2], segment[3], segment[4], 0);
480	context.stroke();
481	context.fill();
482
483	e.stopPropagation();
484	}
485	}
486
487	window.onclick = function (e)
488	{
489	RGraph.Redraw();
490	}
491	</script>
492	</pre>
493
494	<b>Important Note</b>
495
496	<p>
497	This method was formerly a common object method, called <i>RGraph.getSegment(e)</i>, but has now (6th March 2011) been
498	moved to be part of the Pie chart object.
499	</p>
500
501	</body>
502	</html>

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