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21 <title>RGraph: HTML5 canvas graph library - meter documentation</title>
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24 <meta name="description" content="RGraph: HTML5 canvas graph software - Documentation about the Meter chart" />
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37 document.getElementById("twitter_div").style.opacity = 0;
38 document.getElementById("twitter_div").style.display = 'none';
42 function ShowTwitterDIV (e)
44 var e = RGraph.FixEventObject(document.all ? event : e);
45 var div = document.getElementById("twitter_div");
46 var img = document.getElementById("twitter_icon");
48 div.style.display = 'block';
49 div.style.left = (RGraph.getCanvasXY(img)[0] + img.offsetWidth - div.offsetWidth + 110) + 'px';
50 div.style.top = (RGraph.getCanvasXY(img)[1] - 1) + 'px';
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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 - Meter 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 This is the Meter chart. Similar to half the Odometer. The difference is purely visual, but may well be more suited to
145 a control panel type application.
149 The example file is <a href="../examples/meter.html">here</a>.
154 window.onload = function ()
156 var meter = new RGraph.Meter('myCanvas', 50, 100, 60);
157 meter.Set('chart.contextmenu', [
158 ['Show palette', RGraph.Showpalette],
159 ['Clear annotations', function () {RGraph.Clear(meter.canvas); meter.Draw();}],
161 ['Cancel', function () {}]
163 meter.Set('chart.annotatable', true);
164 meter.Set('chart.label.position', 'inside');
165 meter.Set('chart.title', 'A sample measurement');
166 meter.Set('chart.title.vpos', 0.5);
167 meter.Set('chart.units.post', 'k');
168 meter.Set('chart.red.start', 0);
169 meter.Set('chart.red.end', 3);
170 meterSet('chart.yellow.start', 3);
171 meter.Set('chart.yellow.end', 6);
172 meter.Set('chart.green.start', 6);
173 meter.Set('chart.green.end', 10);
181 You can use these properties to control how the Meter apears. You can set them by using the Set() method. Eg:
185 <b>myMeter.Set('name', 'value');</b>
189 <li><a href="#margins">Margins</a></li>
190 <li><a href="#colors">Colors</a></li>
191 <li><a href="#labels and text">Labels and text</a></li>
192 <li><a href="#titles">Titles</a></li>
193 <li><a href="#scale">Scale</a></li>
194 <li><a href="#interactive features">Interactive features</a></li>
195 <li><a href="#shadow">Shadow</a></li>
196 <li><a href="#zoom">Zoom</a></li>
197 <li><a href="#miscellaneous">Miscellaneous</a></li>
201 <a name="margins"></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">Margins</h3> <a name="chart.gutter"></a>
203 <b>chart.gutter</b><br />
204 The gutter of the graph. <br /><i>Default: 25</i><br /><br />
205 <a name="colors"></a>
206 <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.border.color"></a>
207 <b>chart.border.color</b><br />
208 The color of the outline (including tickmarks).<br /><i>Default: black</i><br /><br />
209 <a name="chart.green.start"></a>
210 <b>chart.green.start</b><br />
211 The value that the green area should begin at. <br /><i>Default: 35% of the maximum value</i><br /><br />
212 <a name="chart.green.end"></a>
213 <b>chart.green.end</b><br />
214 The value that the green area should end at. <br /><i>Default: The maximum value</i><br /><br />
215 <a name="chart.green.color"></a>
216 <b>chart.green.color</b><br />
217 The color of the green area, (can be any color).. <br /><i>Default: #207A20</i><br /><br />
218 <a name="chart.yellow.start"></a>
219 <b>chart.yellow.start</b><br />
220 The value that the yellow area should begin at. <br /><i>Default: 10% of the maximum value</i><br /><br />
221 <a name="chart.yellow.end"></a>
222 <b>chart.yellow.end</b><br />
223 The value that the yellow area should end at. <br /><i>Default: 35% of the maximum value</i><br /><br />
224 <a name="chart.green.color"></a>
225 <b>chart.green.color</b><br />
226 The color of the yellow area, (can be any color).. <br /><i>Default: #D0AC41</i><br /><br />
227 <a name="chart.red.start"></a>
228 <b>chart.red.start</b><br />
229 The value that the red area should begin at. <br /><i>Default: The minimum value</i><br /><br />
230 <a name="chart.red.end"></a>
231 <b>chart.red.end</b><br />
232 The value that the red area should end at. <br /><i>Default: 10% of the maximum value</i><br /><br />
233 <a name="chart.red.color"></a>
234 <b>chart.red.color</b><br />
235 The color of the red area, (can be any color).. <br /><i>Default: #9E1E1E</i><br /><br />
236 <a name="labels and text"></a>
237 <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.color"></a>
238 <b>chart.text.color</b><br />
239 The color of the labels. <br /><i>Default: black</i><br /><br />
240 <a name="chart.text.size"></a>
241 <b>chart.text.size</b><br />
242 The size (in points) of the labels. <br /><i>Default: 10</i><br /><br />
243 <a name="chart.text.font"></a>
244 <b>chart.text.font</b><br />
245 The font used to render the text.<br /><i>Default: Verdana</i><br /><br />
246 <a name="titles"></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">Titles</h3> <a name="chart.title"></a>
248 <b>chart.title</b><br />
249 The title of the graph, if any. <br /><i>Default: null</i><br /><br />
251 <a name="chart.title.background"></a>
252 <b>chart.title.background</b><br />
253 The background color (if any) for the title.<br />
254 <i>Default: null</i><br /><br />
256 <a name="chart.title.color"></a>
257 <b>chart.title.color</b><br />
258 The color of the title.<br /> <i>Default: black</i><br /><br />
259 <a name="chart.title.hpos"></a>
260 <b>chart.title.hpos</b><br />
261 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 />
262 <a name="chart.title.vpos"></a>
263 <b>chart.title.vpos</b><br />
264 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 />
266 <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>
267 <b>chart.units.pre</b><br />
268 The units that the labels are measured in. This string is displayed BEFORE the actual number, allowing you to specify values such as "$50".<br /><i>Default: none</i><br /><br />
269 <a name="chart.units.post"></a>
270 <b>chart.units.post</b><br />
271 The units that the labels are measured in. This string is displayed AFTER the actual number, allowing you to specify values such as "50ms".<br /><i>Default: none</i><br /><br />
272 <a name="interactive features"></a>
273 <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> <a name="chart.contextmenu"></a>
274 <b>chart.contextmenu</b><br />
275 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 />
276 <a name="chart.resizable"></a>
277 <b>chart.resizable</b><br />
278 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 />
279 <a name="chart.annotatable"></a>
280 <b>chart.annotatable</b><br />
281 Whether annotations are enabled for the chart (ie you can draw on the chart interactively).<br /><i>Default: false</i><br /><br />
282 <a name="chart.annotate.color"></a>
283 <b>chart.annotate.color</b><br />
284 If you do not allow the use of the palette, then this will be the only color allowed for annotations.<br /><i>Default: black</i><br /><br />
285 <a name="shadow"></a>
286 <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">Shadow</h3> <a name="chart.shadow"></a>
287 <b>chart.shadow</b><br />
288 If true a shadow will be applied to the meter.<br /><i>Default: false</i><br /><br />
289 <a name="chart.shadow.color"></a>
290 <b>chart.shadow.color</b><br />
291 The color of the shadow. <br /><i>Default: rgba(0,0,0,0.5)</i><br /><br />
292 <a name="chart.shadow.offsetx"></a>
293 <b>chart.shadow.offsetx</b><br />
294 The X offset in pixels for the shadow.<br /><i>Default: 3</i><br /><br />
295 <a name="chart.shadow.offsety"></a>
296 <b>chart.shadow.offsety</b><br />
297 The Y offset in pixels for the shadow.<br /><i>Default: 3</i><br /><br />
298 <a name="chart.shadow.blur"></a>
299 <b>chart.shadow.blur</b><br />
300 The severity of the shadow blurring effect.<br /><i>Default: 3</i><br /><br />
302 <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>
303 <b>chart.zoom.mode</b><br />
304 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 />
305 <a name="chart.zoom.factor"></a>
306 <b>chart.zoom.factor</b><br />
307 This is the factor that the graph will be zoomed by (bigger values means more zoom)<br /><i>Default: 1.5</i><br /><br />
308 <a name="chart.zoom.fade.in"></a>
309 <b>chart.zoom.fade.in</b><br />
310 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 />
311 <a name="chart.zoom.fade.out"></a>
312 <b>chart.zoom.fade.out</b><br />
313 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 />
314 <a name="chart.zoom.hdir"></a>
315 <b>chart.zoom.hdir</b><br />
316 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 />
317 <a name="chart.zoom.vdir"></a>
318 <b>chart.zoom.vdir</b><br />
319 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 />
320 <a name="chart.zoom.delay"></a>
321 <b>chart.zoom.delay</b><br />
322 The delay (in milliseconds) between frames.<br /><i>Default: 50</i><br /><br />
323 <a name="chart.zoom.frames"></a>
324 <b>chart.zoom.frames</b><br />
325 The number of frames in the zoom animation.<br /><i>Default: 10</i><br /><br />
326 <a name="chart.zoom.shadow"></a>
327 <b>chart.zoom.shadow</b><br />
328 Whether or not the zoomed canvas has a shadow or not.<br /><i>Default: true</i><br /><br />
329 <a name="chart.zoom.thumbnail.width"></a>
330 <b>chart.zoom.thumbnail.width</b><br />
331 When the zoom is in thumbnail mode, this is the width (in pixels) of the thumbnail.<br /><i>Default: 75</i><br /><br />
332 <a name="chart.zoom.thumbnail.height"></a>
333 <b>chart.zoom.thumbnail.height</b><br />
334 When the zoom is in thumbnail mode, this is the height (in pixels) of the thumbnail.<br /><i>Default: 75</i><br /><br />
335 <a name="chart.zoom.background"></a>
336 <b>chart.zoom.background</b><br />
337 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 />
338 <a name="miscellaneous"></a>
339 <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.linewidth"></a>
340 <b>chart.linewidth</b><br />
341 The width of the outline of the Meter. <br /><i>Default: 2</i><br /><br />
342 </div><!-- /DOCS --><br /><br />