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21 <title>RGraph: HTML5 canvas graph library - Pie chart documentation</title>
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127 <div id="breadcrumb">
128 <a href="../index.html">RGraph: HTML5 canvas graph library</a>
130 <a href="index.html">Documentation</a>
135 <h1>RGraph: HTML5 canvas graph library - Pie chart documentation</h1>
138 if (RGraph.isIE8()) {
139 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 graphs, 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://groups.google.com/group/rgraph/browse_thread/thread/c5651ff8c56b8f3c#" target="_blank">here</a> to see some screenshots.</div>');
144 The pie chart can be used, for example, to represent something that is akin to percentages. ie A set of data that
145 should be taken as part of a whole.
149 The example file is <a href="../examples/pie.html">here</a>.
154 window.onload = function ()
156 var data = [564,155,499,611,322];
158 var pie = new RGraph.Pie('myPie', data);
159 pie.Set('chart.labels', ['Abc', 'Def', 'Ghi', 'Jkl', 'Mno']);
160 pie.Set('chart.linewidth', 5);
161 pie.Set('chart.stroke', '#fff');
167 <a name="available.properties"></a>
169 <li><a href="#available.properties">Properties</a></li>
170 <li><a href="#available.methods">Methods</a></li>
176 You can use these properties to control how the pie chart looks. You can set them by using the Set() method. Eg:
180 <b>myPie.Set('name', 'value');</b>
184 <li><a href="#margins">Margins</a></li>
185 <li><a href="#colors">Colors</a></li>
186 <li><a href="#labels and text">Labels and text</a></li>
187 <li><a href="#titles">Titles</a></li>
188 <li><a href="#shadows">Shadows</a></li>
189 <li><a href="#interactive features">Interactive features</a></li>
190 <li><a href="#key">Key</a></li>
191 <li><a href="#zoom">Zoom</a></li>
192 <li><a href="#scale">Scale</a></li>
193 <li><a href="#miscellaneous">Miscellaneous</a></li>
197 <a name="margins"></a>
198 <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> <a name="chart.gutter"></a>
199 <b>chart.gutter</b><br />
200 The gutter of the graph (for text labels). <br /><i>Default: 25</i><br /><br />
201 <a name="colors"></a>
202 <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>
203 <b>chart.colors</b><br />
204 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 />
205 <a name="chart.strokestyle"></a>
206 <b>chart.strokestyle</b><br />
207 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 />
208 <a name="labels and text"></a>
209 <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>
210 <b>chart.text.size</b><br />
211 The size of the text (in points). <br /><i>Default: 10</i><br /><br />
212 <a name="chart.text.font"></a>
213 <b>chart.text.font</b><br />
214 The font used to render the text.<br /><i>Default: Verdana</i><br /><br />
215 <a name="chart.text.color"></a>
216 <b>chart.text.color</b><br />
217 The color of the labels. <br /><i>Default: black</i><br /><br />
218 <a name="chart.labels"></a>
219 <b>chart.labels</b><br />
220 An array of labels to be used for the chart. <br /><i>Default: [] (an empty array)</i><br /><br />
221 <a name="chart.labels.sticks"></a>
222 <b>chart.labels.sticks</b><br />
223 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 />
224 <a name="chart.labels.sticks.color"></a>
225 <b>chart.labels.sticks.color</b><br />
226 Sets the color of the label sticks.<br /><i>Default: #aaa</i><br /><br />
227 <a name="titles"></a>
228 <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>
229 <b>chart.title</b><br />
230 The title of the pie chart. <br /><i>Default: none</i><br /><br />
232 <a name="chart.title.background"></a>
233 <b>chart.title.background</b><br />
234 The background color (if any) for the title.<br />
235 <i>Default: null</i><br /><br />
237 <a name="chart.title.color"></a>
238 <b>chart.title.color</b><br />
239 The color of the title.<br /> <i>Default: black</i><br /><br />
240 <a name="chart.title.hpos"></a>
241 <b>chart.title.hpos</b><br />
242 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 />
243 <a name="chart.title.vpos"></a>
244 <b>chart.title.vpos</b><br />
245 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 />
246 <a name="shadows"></a>
247 <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>
248 <b>chart.shadow</b><br />
249 Whether a simple shadow effect is applied. <br /><i>Default: false</i><br /><br />
250 <a name="chart.shadow.color"></a>
251 <b>chart.shadow.color</b><br />
252 The color of the shadow. <br /> <i>Default: rgba(0,0,0,0.5)</i><br /><br />
253 <a name="chart.shadow.blur"></a>
254 <b>chart.shadow.blur</b><br />
255 The severity of the shadow blurring effect. <br /> <i>Default: 3</i><br /><br />
256 <a name="chart.shadow.offsetx"></a>
257 <b>chart.shadow.offsetx</b><br />
258 The X offset of the shadow.<br /><i>Default: 3</i><br /><br />
259 <a name="chart.shadow.offsety"></a>
260 <b>chart.shadow.offsety</b><br />
261 The Y offset of the shadow.<br /><i>Default: 3</i><br /><br />
262 <a name="interactive features"></a>
263 <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>
265 <a name="chart.tooltips"></a>
266 <b>chart.tooltips</b><br />
267 An array of tooltips, starting from the middle right (ie east) axis, and going clockwise sequentially.<br />
268 <i>Default: [] (An empty array)</i><br /><br />
270 <a name="chart.tooltips.event"></a>
271 <b>chart.tooltips.event</b><br />
272 This can be <i>onclick</i> or <i>onmousemove</i> and determines which event is used for tooltips.<br />
273 <i>Default: onclick</i><br /><br />
275 <a name="chart.tooltips.effect"></a>
276 <b>chart.tooltips.effect</b><br />
277 The animated effect used for showing tooltips. Can be either <i>fade</i> or <i>expand</i>.<br />
278 <i>Default: fade</i><br /><br />
280 <a name="chart.tooltips.css.class"></a>
281 <b>chart.tooltips.css.class</b><br />
282 This is the name of the CSS class the graph uses.<br />
283 <i>Default: RGraph_tooltip</i><br /><br />
285 <a name="chart.tooltips.override"></a>
286 <b>chart.tooltips.override</b><br />
287 If you wish to handle showing tooltips yourself, this should be a function object which does just that. There's more
288 information on the <a href="tooltips.html">tooltips documentation page</a><br />
289 <i>Default: null</i><br /><br />
292 <a name="chart.contextmenu"></a>
293 <b>chart.contextmenu</b><br />
294 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 />
295 <a name="chart.annotatable"></a>
296 <b>chart.annotatable</b><br />
297 Whether annotations are enabled for the chart (ie you can draw on the chart interactively.<br /><i>Default: false</i><br /><br />
298 <a name="chart.annotate.color"></a>
299 <b>chart.annotate.color</b><br />
300 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 />
301 <a name="chart.resizable"></a>
302 <b>chart.resizable</b><br />
303 Defaulting to false, this determines whether your graph 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 /><i>Default: false</i><br /><br />
309 <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>
311 <a name="chart.key"></a>
312 <b>chart.key</b><br />
313 An array of key information. <br />
314 <i>Default: [] (An empty array)</i><br /><br />
316 <a name="chart.key.background"></a>
317 <b>chart.key.background</b><br />
318 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>
319 <i>Default: white</i><br /><br />
321 <a name="chart.key.position"></a>
322 <b>chart.key.position</b><br />
323 Determines the position of the key.Either <b>graph</b> (default), or <b>gutter</b>.<br />
324 <i>Default: graph</i><br /><br />
326 <b>chart.key.position.x</b><br />
327 This allows you to specify a specific X coordinate for the key.<br />
328 <i>Default: null</i><br /><br />
330 <b>chart.key.position.y</b><br />
331 This allows you to specify a specific Y coordinate for the key.<br />
332 <i>Default: null</i><br /><br />
334 <b>chart.key.position.gutter.boxed</b><br />
335 If you have the key in gutter mode (ie horizontal), this allows you to give a background color.<br />
336 <i>Default: true</i><br /><br />
338 <a name="chart.key.shadow"></a>
339 <b>chart.key.shadow</b><br />
340 Whether a small drop shadow is applied to the key.<br />
341 <i>Default: false</i><br /><br />
343 <a name="chart.key.shadow.color"></a>
344 <b>chart.key.shadow.color</b><br />
345 The color of the shadow.<br />
346 <i>Default: #666</i><br /><br />
348 <a name="chart.key.shadow.blur"></a>
349 <b>chart.key.shadow.blur</b><br />
350 The extent of the blurring effect used on the shadow.<br />
351 <i>Default: 3</i><br /><br />
353 <a name="chart.key.shadow.offsetx"></a>
354 <b>chart.key.shadow.offsetx</b><br />
355 The X offset of the shadow.<br />
356 <i>Default: 2</i><br /><br />
358 <a name="chart.key.shadow.offsety"></a>
359 <b>chart.key.shadow.offsety</b><br />
360 The Y offset of the shadow.<br />
361 <i>Default: 2</i><br /><br />
363 <b>chart.key.rounded</b><br />
364 This controls whether the corners of the key (in graph mode) are curved. If the key is gutter mode, this has no effect.<br />
365 <i>Default: false</i><br /><br />
367 <b>chart.key.color.shape</b><br />
368 This can be <i>square</i>, <i>circle</i> or <i>line</i> and controls how the color indicators in the key appear.<br />
369 <i>Default: square</i><br /><br />
374 <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>
375 <b>chart.zoom.mode</b><br />
376 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 />
377 <a name="chart.zoom.factor"></a>
378 <b>chart.zoom.factor</b><br />
379 This is the factor that the graph will be zoomed by (bigger values means more zoom)<br /><i>Default: 1.5</i><br /><br />
380 <a name="chart.zoom.fade.in"></a>
381 <b>chart.zoom.fade.in</b><br />
382 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 />
383 <a name="chart.zoom.fade.out"></a>
384 <b>chart.zoom.fade.out</b><br />
385 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 />
386 <a name="chart.zoom.hdir"></a>
387 <b>chart.zoom.hdir</b><br />
388 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 />
389 <a name="chart.zoom.vdir"></a>
390 <b>chart.zoom.vdir</b><br />
391 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 />
392 <a name="chart.zoom.delay"></a>
393 <b>chart.zoom.delay</b><br />
394 The delay (in milliseconds) between frames.<br /><i>Default: 50</i><br /><br />
395 <a name="chart.zoom.frames"></a>
396 <b>chart.zoom.frames</b><br />
397 The number of frames in the zoom animation.<br /><i>Default: 10</i><br /><br />
398 <a name="chart.zoom.shadow"></a>
399 <b>chart.zoom.shadow</b><br />
400 Whether or not the zoomed canvas has a shadow or not.<br /><i>Default: true</i><br /><br />
401 <a name="chart.zoom.thumbnail.width"></a>
402 <b>chart.zoom.thumbnail.width</b><br />
403 When the zoom is in thumbnail mode, this is the width (in pixels) of the thumbnail.<br /><i>Default: 75</i><br /><br />
404 <a name="chart.zoom.thumbnail.height"></a>
405 <b>chart.zoom.thumbnail.height</b><br />
406 When the zoom is in thumbnail mode, this is the height (in pixels) of the thumbnail.<br /><i>Default: 75</i><br /><br />
407 <a name="chart.zoom.background"></a>
408 <b>chart.zoom.background</b><br />
409 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 />
411 <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> <a name="chart.units.pre"></a>
412 <b>chart.units.pre</b><br />
413 The units that the value is measured in. This string is displayed BEFORE the actual number, allowing you to specify values such as "$50" and is only used if chart.value.text is <i>true</i>.<br /><i>Default: none</i><br /><br />
414 <a name="chart.units.post"></a>
415 <b>chart.units.post</b><br />
416 The units that the value is measured in. This string is displayed AFTER the actual number, allowing you to specify values such as "50ms" and is only used if chart.value.text is <i>true</i>.<br /><i>Default: none</i><br /><br />
417 <a name="miscellaneous"></a>
418 <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>
419 <b>chart.align</b><br />
420 Whether to left, center or right align the pie chart.<br /><i>Default: center</i><br /><br />
421 <a name="chart.linewidth"></a>
422 <b>chart.linewidth</b><br />
423 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 />
424 <a name="chart.variant"></a>
425 <b>chart.variant</b><br />
426 This can be either <i>pie</i> (the default) or <i>donut</i>. Setting this to <i>donut</i> is how you get a donut chart.<br /><i>Default: pie</i><br /><br />
427 <a name="chart.value.text"></a>
428 <b>chart.value.text</b><br />
429 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 />
431 <a name="chart.highlight.style"></a>
432 <b>chart.highlight.style</b><br />
433 Can be either <i>2d</i> or <i>3d</i> and determines which style of segment highlighting is used in
434 conjunction with tooltips.<br />
435 <i>Default: 2d</i><br /><br />
437 <a name="chart.highlight.style.2d.color"></a>
438 <b>chart.highlight.style.2d.color</b><br />
439 When 2D highlighting for tooltips is used, this controls the color of the highlighting.<br />
440 <i>Default: rgba(255,255,255,0.5)</i><br /><br />
443 <a name="available.methods"></a>
447 <b>RGraph.getSegment()</b><br /><br />
449 RGraph.getSegment() makes it easy to determine which segment of the Pie chart was clicked on. It provides:
452 <li>Originating X coordinate</li>
453 <li>Originating Y coordinate</li>
454 <li>The radius of the segment</li>
455 <li>The starting angle (in degrees)</li>
456 <li>The ending angle (in degrees)</li>
461 RGraph.Register(myGraph);
463 myGraph.canvas.onclick = function (e)
465 RGraph.FixEventObject(e);
468 var canvas = e.target;
469 var context = canvas.getContext('2d');
470 var obj = canvas.__object__;
471 <span style="color: green">var segment = RGraph.getSegment(e);</span>
474 context.fillStyle = 'rgba(255,255,255,0.5)';
477 // Angles are provided in degrees, so convert them to radians
481 context.moveTo(segment[0], segment[1]);
482 context.arc(segment[0], segment[1], segment[2], segment[3], segment[4], 0);
490 window.onclick = function (e)