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| 58d006 | 1 | /* Flot plugin for rendering pie charts. |
| A | 2 | |
| 3 | Copyright (c) 2007-2013 IOLA and Ole Laursen. | |
| 4 | Licensed under the MIT license. | |
| 5 | ||
| 6 | The plugin assumes that each series has a single data value, and that each | |
| 7 | value is a positive integer or zero. Negative numbers don't make sense for a | |
| 8 | pie chart, and have unpredictable results. The values do NOT need to be | |
| 9 | passed in as percentages; the plugin will calculate the total and per-slice | |
| 10 | percentages internally. | |
| 11 | ||
| 12 | * Created by Brian Medendorp | |
| 13 | ||
| 14 | * Updated with contributions from btburnett3, Anthony Aragues and Xavi Ivars | |
| 15 | ||
| 16 | The plugin supports these options: | |
| 17 | ||
| 18 | series: { | |
| 19 | pie: { | |
| 20 | show: true/false | |
| 21 | radius: 0-1 for percentage of fullsize, or a specified pixel length, or 'auto' | |
| 22 | innerRadius: 0-1 for percentage of fullsize or a specified pixel length, for creating a donut effect | |
| 23 | startAngle: 0-2 factor of PI used for starting angle (in radians) i.e 3/2 starts at the top, 0 and 2 have the same result | |
| 24 | tilt: 0-1 for percentage to tilt the pie, where 1 is no tilt, and 0 is completely flat (nothing will show) | |
| 25 | offset: { | |
| 26 | top: integer value to move the pie up or down | |
| 27 | left: integer value to move the pie left or right, or 'auto' | |
| 28 | }, | |
| 29 | stroke: { | |
| 30 | color: any hexidecimal color value (other formats may or may not work, so best to stick with something like '#FFF') | |
| 31 | width: integer pixel width of the stroke | |
| 32 | }, | |
| 33 | label: { | |
| 34 | show: true/false, or 'auto' | |
| 35 | formatter: a user-defined function that modifies the text/style of the label text | |
| 36 | radius: 0-1 for percentage of fullsize, or a specified pixel length | |
| 37 | background: { | |
| 38 | color: any hexidecimal color value (other formats may or may not work, so best to stick with something like '#000') | |
| 39 | opacity: 0-1 | |
| 40 | }, | |
| 41 | threshold: 0-1 for the percentage value at which to hide labels (if they're too small) | |
| 42 | }, | |
| 43 | combine: { | |
| 44 | threshold: 0-1 for the percentage value at which to combine slices (if they're too small) | |
| 45 | color: any hexidecimal color value (other formats may or may not work, so best to stick with something like '#CCC'), if null, the plugin will automatically use the color of the first slice to be combined | |
| 46 | label: any text value of what the combined slice should be labeled | |
| 47 | } | |
| 48 | highlight: { | |
| 49 | opacity: 0-1 | |
| 50 | } | |
| 51 | } | |
| 52 | } | |
| 53 | ||
| 54 | More detail and specific examples can be found in the included HTML file. | |
| 55 | ||
| 56 | */ | |
| 57 | ||
| 58 | (function($) { | |
| 59 | ||
| 60 | // Maximum redraw attempts when fitting labels within the plot | |
| 61 | ||
| 62 | var REDRAW_ATTEMPTS = 10; | |
| 63 | ||
| 64 | // Factor by which to shrink the pie when fitting labels within the plot | |
| 65 | ||
| 66 | var REDRAW_SHRINK = 0.95; | |
| 67 | ||
| 68 | function init(plot) { | |
| 69 | ||
| 70 | var canvas = null, | |
| 71 | target = null, | |
| 72 | maxRadius = null, | |
| 73 | centerLeft = null, | |
| 74 | centerTop = null, | |
| 75 | processed = false, | |
| 76 | ctx = null; | |
| 77 | ||
| 78 | // interactive variables | |
| 79 | ||
| 80 | var highlights = []; | |
| 81 | ||
| 82 | // add hook to determine if pie plugin in enabled, and then perform necessary operations | |
| 83 | ||
| 84 | plot.hooks.processOptions.push(function(plot, options) { | |
| 85 | if (options.series.pie.show) { | |
| 86 | ||
| 87 | options.grid.show = false; | |
| 88 | ||
| 89 | // set labels.show | |
| 90 | ||
| 91 | if (options.series.pie.label.show == "auto") { | |
| 92 | if (options.legend.show) { | |
| 93 | options.series.pie.label.show = false; | |
| 94 | } else { | |
| 95 | options.series.pie.label.show = true; | |
| 96 | } | |
| 97 | } | |
| 98 | ||
| 99 | // set radius | |
| 100 | ||
| 101 | if (options.series.pie.radius == "auto") { | |
| 102 | if (options.series.pie.label.show) { | |
| 103 | options.series.pie.radius = 3/4; | |
| 104 | } else { | |
| 105 | options.series.pie.radius = 1; | |
| 106 | } | |
| 107 | } | |
| 108 | ||
| 109 | // ensure sane tilt | |
| 110 | ||
| 111 | if (options.series.pie.tilt > 1) { | |
| 112 | options.series.pie.tilt = 1; | |
| 113 | } else if (options.series.pie.tilt < 0) { | |
| 114 | options.series.pie.tilt = 0; | |
| 115 | } | |
| 116 | } | |
| 117 | }); | |
| 118 | ||
| 119 | plot.hooks.bindEvents.push(function(plot, eventHolder) { | |
| 120 | var options = plot.getOptions(); | |
| 121 | if (options.series.pie.show) { | |
| 122 | if (options.grid.hoverable) { | |
| 123 | eventHolder.unbind("mousemove").mousemove(onMouseMove); | |
| 124 | } | |
| 125 | if (options.grid.clickable) { | |
| 126 | eventHolder.unbind("click").click(onClick); | |
| 127 | } | |
| 128 | } | |
| 129 | }); | |
| 130 | ||
| 131 | plot.hooks.processDatapoints.push(function(plot, series, data, datapoints) { | |
| 132 | var options = plot.getOptions(); | |
| 133 | if (options.series.pie.show) { | |
| 134 | processDatapoints(plot, series, data, datapoints); | |
| 135 | } | |
| 136 | }); | |
| 137 | ||
| 138 | plot.hooks.drawOverlay.push(function(plot, octx) { | |
| 139 | var options = plot.getOptions(); | |
| 140 | if (options.series.pie.show) { | |
| 141 | drawOverlay(plot, octx); | |
| 142 | } | |
| 143 | }); | |
| 144 | ||
| 145 | plot.hooks.draw.push(function(plot, newCtx) { | |
| 146 | var options = plot.getOptions(); | |
| 147 | if (options.series.pie.show) { | |
| 148 | draw(plot, newCtx); | |
| 149 | } | |
| 150 | }); | |
| 151 | ||
| 152 | function processDatapoints(plot, series, datapoints) { | |
| 153 | if (!processed) { | |
| 154 | processed = true; | |
| 155 | canvas = plot.getCanvas(); | |
| 156 | target = $(canvas).parent(); | |
| 157 | options = plot.getOptions(); | |
| 158 | plot.setData(combine(plot.getData())); | |
| 159 | } | |
| 160 | } | |
| 161 | ||
| 162 | function combine(data) { | |
| 163 | ||
| 164 | var total = 0, | |
| 165 | combined = 0, | |
| 166 | numCombined = 0, | |
| 167 | color = options.series.pie.combine.color, | |
| 168 | newdata = []; | |
| 169 | ||
| 170 | // Fix up the raw data from Flot, ensuring the data is numeric | |
| 171 | ||
| 172 | for (var i = 0; i < data.length; ++i) { | |
| 173 | ||
| 174 | var value = data[i].data; | |
| 175 | ||
| 176 | // If the data is an array, we'll assume that it's a standard | |
| 177 | // Flot x-y pair, and are concerned only with the second value. | |
| 178 | ||
| 179 | // Note how we use the original array, rather than creating a | |
| 180 | // new one; this is more efficient and preserves any extra data | |
| 181 | // that the user may have stored in higher indexes. | |
| 182 | ||
| 183 | if ($.isArray(value) && value.length == 1) { | |
| 184 | value = value[0]; | |
| 185 | } | |
| 186 | ||
| 187 | if ($.isArray(value)) { | |
| 188 | // Equivalent to $.isNumeric() but compatible with jQuery < 1.7 | |
| 189 | if (!isNaN(parseFloat(value[1])) && isFinite(value[1])) { | |
| 190 | value[1] = +value[1]; | |
| 191 | } else { | |
| 192 | value[1] = 0; | |
| 193 | } | |
| 194 | } else if (!isNaN(parseFloat(value)) && isFinite(value)) { | |
| 195 | value = [1, +value]; | |
| 196 | } else { | |
| 197 | value = [1, 0]; | |
| 198 | } | |
| 199 | ||
| 200 | data[i].data = [value]; | |
| 201 | } | |
| 202 | ||
| 203 | // Sum up all the slices, so we can calculate percentages for each | |
| 204 | ||
| 205 | for (var i = 0; i < data.length; ++i) { | |
| 206 | total += data[i].data[0][1]; | |
| 207 | } | |
| 208 | ||
| 209 | // Count the number of slices with percentages below the combine | |
| 210 | // threshold; if it turns out to be just one, we won't combine. | |
| 211 | ||
| 212 | for (var i = 0; i < data.length; ++i) { | |
| 213 | var value = data[i].data[0][1]; | |
| 214 | if (value / total <= options.series.pie.combine.threshold) { | |
| 215 | combined += value; | |
| 216 | numCombined++; | |
| 217 | if (!color) { | |
| 218 | color = data[i].color; | |
| 219 | } | |
| 220 | } | |
| 221 | } | |
| 222 | ||
| 223 | for (var i = 0; i < data.length; ++i) { | |
| 224 | var value = data[i].data[0][1]; | |
| 225 | if (numCombined < 2 || value / total > options.series.pie.combine.threshold) { | |
| 226 | newdata.push({ | |
| 227 | data: [[1, value]], | |
| 228 | color: data[i].color, | |
| 229 | label: data[i].label, | |
| 230 | angle: value * Math.PI * 2 / total, | |
| 231 | percent: value / (total / 100) | |
| 232 | }); | |
| 233 | } | |
| 234 | } | |
| 235 | ||
| 236 | if (numCombined > 1) { | |
| 237 | newdata.push({ | |
| 238 | data: [[1, combined]], | |
| 239 | color: color, | |
| 240 | label: options.series.pie.combine.label, | |
| 241 | angle: combined * Math.PI * 2 / total, | |
| 242 | percent: combined / (total / 100) | |
| 243 | }); | |
| 244 | } | |
| 245 | ||
| 246 | return newdata; | |
| 247 | } | |
| 248 | ||
| 249 | function draw(plot, newCtx) { | |
| 250 | ||
| 251 | if (!target) { | |
| 252 | return; // if no series were passed | |
| 253 | } | |
| 254 | ||
| 255 | var canvasWidth = plot.getPlaceholder().width(), | |
| 256 | canvasHeight = plot.getPlaceholder().height(), | |
| 257 | legendWidth = target.children().filter(".legend").children().width() || 0; | |
| 258 | ||
| 259 | ctx = newCtx; | |
| 260 | ||
| 261 | // WARNING: HACK! REWRITE THIS CODE AS SOON AS POSSIBLE! | |
| 262 | ||
| 263 | // When combining smaller slices into an 'other' slice, we need to | |
| 264 | // add a new series. Since Flot gives plugins no way to modify the | |
| 265 | // list of series, the pie plugin uses a hack where the first call | |
| 266 | // to processDatapoints results in a call to setData with the new | |
| 267 | // list of series, then subsequent processDatapoints do nothing. | |
| 268 | ||
| 269 | // The plugin-global 'processed' flag is used to control this hack; | |
| 270 | // it starts out false, and is set to true after the first call to | |
| 271 | // processDatapoints. | |
| 272 | ||
| 273 | // Unfortunately this turns future setData calls into no-ops; they | |
| 274 | // call processDatapoints, the flag is true, and nothing happens. | |
| 275 | ||
| 276 | // To fix this we'll set the flag back to false here in draw, when | |
| 277 | // all series have been processed, so the next sequence of calls to | |
| 278 | // processDatapoints once again starts out with a slice-combine. | |
| 279 | // This is really a hack; in 0.9 we need to give plugins a proper | |
| 280 | // way to modify series before any processing begins. | |
| 281 | ||
| 282 | processed = false; | |
| 283 | ||
| 284 | // calculate maximum radius and center point | |
| 285 | ||
| 286 | maxRadius = Math.min(canvasWidth, canvasHeight / options.series.pie.tilt) / 2; | |
| 287 | centerTop = canvasHeight / 2 + options.series.pie.offset.top; | |
| 288 | centerLeft = canvasWidth / 2; | |
| 289 | ||
| 290 | if (options.series.pie.offset.left == "auto") { | |
| 291 | if (options.legend.position.match("w")) { | |
| 292 | centerLeft += legendWidth / 2; | |
| 293 | } else { | |
| 294 | centerLeft -= legendWidth / 2; | |
| 295 | } | |
| 296 | } else { | |
| 297 | centerLeft += options.series.pie.offset.left; | |
| 298 | } | |
| 299 | ||
| 300 | if (centerLeft < maxRadius) { | |
| 301 | centerLeft = maxRadius; | |
| 302 | } else if (centerLeft > canvasWidth - maxRadius) { | |
| 303 | centerLeft = canvasWidth - maxRadius; | |
| 304 | } | |
| 305 | ||
| 306 | var slices = plot.getData(), | |
| 307 | attempts = 0; | |
| 308 | ||
| 309 | // Keep shrinking the pie's radius until drawPie returns true, | |
| 310 | // indicating that all the labels fit, or we try too many times. | |
| 311 | ||
| 312 | do { | |
| 313 | if (attempts > 0) { | |
| 314 | maxRadius *= REDRAW_SHRINK; | |
| 315 | } | |
| 316 | attempts += 1; | |
| 317 | clear(); | |
| 318 | if (options.series.pie.tilt <= 0.8) { | |
| 319 | drawShadow(); | |
| 320 | } | |
| 321 | } while (!drawPie() && attempts < REDRAW_ATTEMPTS) | |
| 322 | ||
| 323 | if (attempts >= REDRAW_ATTEMPTS) { | |
| 324 | clear(); | |
| 325 | target.prepend("<div class='error'>Could not draw pie with labels contained inside canvas</div>"); | |
| 326 | } | |
| 327 | ||
| 328 | if (plot.setSeries && plot.insertLegend) { | |
| 329 | plot.setSeries(slices); | |
| 330 | plot.insertLegend(); | |
| 331 | } | |
| 332 | ||
| 333 | // we're actually done at this point, just defining internal functions at this point | |
| 334 | ||
| 335 | function clear() { | |
| 336 | ctx.clearRect(0, 0, canvasWidth, canvasHeight); | |
| 337 | target.children().filter(".pieLabel, .pieLabelBackground").remove(); | |
| 338 | } | |
| 339 | ||
| 340 | function drawShadow() { | |
| 341 | ||
| 342 | var shadowLeft = options.series.pie.shadow.left; | |
| 343 | var shadowTop = options.series.pie.shadow.top; | |
| 344 | var edge = 10; | |
| 345 | var alpha = options.series.pie.shadow.alpha; | |
| 346 | var radius = options.series.pie.radius > 1 ? options.series.pie.radius : maxRadius * options.series.pie.radius; | |
| 347 | ||
| 348 | if (radius >= canvasWidth / 2 - shadowLeft || radius * options.series.pie.tilt >= canvasHeight / 2 - shadowTop || radius <= edge) { | |
| 349 | return; // shadow would be outside canvas, so don't draw it | |
| 350 | } | |
| 351 | ||
| 352 | ctx.save(); | |
| 353 | ctx.translate(shadowLeft,shadowTop); | |
| 354 | ctx.globalAlpha = alpha; | |
| 355 | ctx.fillStyle = "#000"; | |
| 356 | ||
| 357 | // center and rotate to starting position | |
| 358 | ||
| 359 | ctx.translate(centerLeft,centerTop); | |
| 360 | ctx.scale(1, options.series.pie.tilt); | |
| 361 | ||
| 362 | //radius -= edge; | |
| 363 | ||
| 364 | for (var i = 1; i <= edge; i++) { | |
| 365 | ctx.beginPath(); | |
| 366 | ctx.arc(0, 0, radius, 0, Math.PI * 2, false); | |
| 367 | ctx.fill(); | |
| 368 | radius -= i; | |
| 369 | } | |
| 370 | ||
| 371 | ctx.restore(); | |
| 372 | } | |
| 373 | ||
| 374 | function drawPie() { | |
| 375 | ||
| 376 | var startAngle = Math.PI * options.series.pie.startAngle; | |
| 377 | var radius = options.series.pie.radius > 1 ? options.series.pie.radius : maxRadius * options.series.pie.radius; | |
| 378 | ||
| 379 | // center and rotate to starting position | |
| 380 | ||
| 381 | ctx.save(); | |
| 382 | ctx.translate(centerLeft,centerTop); | |
| 383 | ctx.scale(1, options.series.pie.tilt); | |
| 384 | //ctx.rotate(startAngle); // start at top; -- This doesn't work properly in Opera | |
| 385 | ||
| 386 | // draw slices | |
| 387 | ||
| 388 | ctx.save(); | |
| 389 | var currentAngle = startAngle; | |
| 390 | for (var i = 0; i < slices.length; ++i) { | |
| 391 | slices[i].startAngle = currentAngle; | |
| 392 | drawSlice(slices[i].angle, slices[i].color, true); | |
| 393 | } | |
| 394 | ctx.restore(); | |
| 395 | ||
| 396 | // draw slice outlines | |
| 397 | ||
| 398 | if (options.series.pie.stroke.width > 0) { | |
| 399 | ctx.save(); | |
| 400 | ctx.lineWidth = options.series.pie.stroke.width; | |
| 401 | currentAngle = startAngle; | |
| 402 | for (var i = 0; i < slices.length; ++i) { | |
| 403 | drawSlice(slices[i].angle, options.series.pie.stroke.color, false); | |
| 404 | } | |
| 405 | ctx.restore(); | |
| 406 | } | |
| 407 | ||
| 408 | // draw donut hole | |
| 409 | ||
| 410 | drawDonutHole(ctx); | |
| 411 | ||
| 412 | ctx.restore(); | |
| 413 | ||
| 414 | // Draw the labels, returning true if they fit within the plot | |
| 415 | ||
| 416 | if (options.series.pie.label.show) { | |
| 417 | return drawLabels(); | |
| 418 | } else return true; | |
| 419 | ||
| 420 | function drawSlice(angle, color, fill) { | |
| 421 | ||
| 422 | if (angle <= 0 || isNaN(angle)) { | |
| 423 | return; | |
| 424 | } | |
| 425 | ||
| 426 | if (fill) { | |
| 427 | ctx.fillStyle = color; | |
| 428 | } else { | |
| 429 | ctx.strokeStyle = color; | |
| 430 | ctx.lineJoin = "round"; | |
| 431 | } | |
| 432 | ||
| 433 | ctx.beginPath(); | |
| 434 | if (Math.abs(angle - Math.PI * 2) > 0.000000001) { | |
| 435 | ctx.moveTo(0, 0); // Center of the pie | |
| 436 | } | |
| 437 | ||
| 438 | //ctx.arc(0, 0, radius, 0, angle, false); // This doesn't work properly in Opera | |
| 439 | ctx.arc(0, 0, radius,currentAngle, currentAngle + angle / 2, false); | |
| 440 | ctx.arc(0, 0, radius,currentAngle + angle / 2, currentAngle + angle, false); | |
| 441 | ctx.closePath(); | |
| 442 | //ctx.rotate(angle); // This doesn't work properly in Opera | |
| 443 | currentAngle += angle; | |
| 444 | ||
| 445 | if (fill) { | |
| 446 | ctx.fill(); | |
| 447 | } else { | |
| 448 | ctx.stroke(); | |
| 449 | } | |
| 450 | } | |
| 451 | ||
| 452 | function drawLabels() { | |
| 453 | ||
| 454 | var currentAngle = startAngle; | |
| 455 | var radius = options.series.pie.label.radius > 1 ? options.series.pie.label.radius : maxRadius * options.series.pie.label.radius; | |
| 456 | ||
| 457 | for (var i = 0; i < slices.length; ++i) { | |
| 458 | if (slices[i].percent >= options.series.pie.label.threshold * 100) { | |
| 459 | if (!drawLabel(slices[i], currentAngle, i)) { | |
| 460 | return false; | |
| 461 | } | |
| 462 | } | |
| 463 | currentAngle += slices[i].angle; | |
| 464 | } | |
| 465 | ||
| 466 | return true; | |
| 467 | ||
| 468 | function drawLabel(slice, startAngle, index) { | |
| 469 | ||
| 470 | if (slice.data[0][1] == 0) { | |
| 471 | return true; | |
| 472 | } | |
| 473 | ||
| 474 | // format label text | |
| 475 | ||
| 476 | var lf = options.legend.labelFormatter, text, plf = options.series.pie.label.formatter; | |
| 477 | ||
| 478 | if (lf) { | |
| 479 | text = lf(slice.label, slice); | |
| 480 | } else { | |
| 481 | text = slice.label; | |
| 482 | } | |
| 483 | ||
| 484 | if (plf) { | |
| 485 | text = plf(text, slice); | |
| 486 | } | |
| 487 | ||
| 488 | var halfAngle = ((startAngle + slice.angle) + startAngle) / 2; | |
| 489 | var x = centerLeft + Math.round(Math.cos(halfAngle) * radius); | |
| 490 | var y = centerTop + Math.round(Math.sin(halfAngle) * radius) * options.series.pie.tilt; | |
| 491 | ||
| 492 | var html = "<span class='pieLabel' id='pieLabel" + index + "' style='position:absolute;top:" + y + "px;left:" + x + "px;'>" + text + "</span>"; | |
| 493 | target.append(html); | |
| 494 | ||
| 495 | var label = target.children("#pieLabel" + index); | |
| 496 | var labelTop = (y - label.height() / 2); | |
| 497 | var labelLeft = (x - label.width() / 2); | |
| 498 | ||
| 499 | label.css("top", labelTop); | |
| 500 | label.css("left", labelLeft); | |
| 501 | ||
| 502 | // check to make sure that the label is not outside the canvas | |
| 503 | ||
| 504 | if (0 - labelTop > 0 || 0 - labelLeft > 0 || canvasHeight - (labelTop + label.height()) < 0 || canvasWidth - (labelLeft + label.width()) < 0) { | |
| 505 | return false; | |
| 506 | } | |
| 507 | ||
| 508 | if (options.series.pie.label.background.opacity != 0) { | |
| 509 | ||
| 510 | // put in the transparent background separately to avoid blended labels and label boxes | |
| 511 | ||
| 512 | var c = options.series.pie.label.background.color; | |
| 513 | ||
| 514 | if (c == null) { | |
| 515 | c = slice.color; | |
| 516 | } | |
| 517 | ||
| 518 | var pos = "top:" + labelTop + "px;left:" + labelLeft + "px;"; | |
| 519 | $("<div class='pieLabelBackground' style='position:absolute;width:" + label.width() + "px;height:" + label.height() + "px;" + pos + "background-color:" + c + ";'></div>") | |
| 520 | .css("opacity", options.series.pie.label.background.opacity) | |
| 521 | .insertBefore(label); | |
| 522 | } | |
| 523 | ||
| 524 | return true; | |
| 525 | } // end individual label function | |
| 526 | } // end drawLabels function | |
| 527 | } // end drawPie function | |
| 528 | } // end draw function | |
| 529 | ||
| 530 | // Placed here because it needs to be accessed from multiple locations | |
| 531 | ||
| 532 | function drawDonutHole(layer) { | |
| 533 | if (options.series.pie.innerRadius > 0) { | |
| 534 | ||
| 535 | // subtract the center | |
| 536 | ||
| 537 | layer.save(); | |
| 538 | var innerRadius = options.series.pie.innerRadius > 1 ? options.series.pie.innerRadius : maxRadius * options.series.pie.innerRadius; | |
| 539 | layer.globalCompositeOperation = "destination-out"; // this does not work with excanvas, but it will fall back to using the stroke color | |
| 540 | layer.beginPath(); | |
| 541 | layer.fillStyle = options.series.pie.stroke.color; | |
| 542 | layer.arc(0, 0, innerRadius, 0, Math.PI * 2, false); | |
| 543 | layer.fill(); | |
| 544 | layer.closePath(); | |
| 545 | layer.restore(); | |
| 546 | ||
| 547 | // add inner stroke | |
| 548 | ||
| 549 | layer.save(); | |
| 550 | layer.beginPath(); | |
| 551 | layer.strokeStyle = options.series.pie.stroke.color; | |
| 552 | layer.arc(0, 0, innerRadius, 0, Math.PI * 2, false); | |
| 553 | layer.stroke(); | |
| 554 | layer.closePath(); | |
| 555 | layer.restore(); | |
| 556 | ||
| 557 | // TODO: add extra shadow inside hole (with a mask) if the pie is tilted. | |
| 558 | } | |
| 559 | } | |
| 560 | ||
| 561 | //-- Additional Interactive related functions -- | |
| 562 | ||
| 563 | function isPointInPoly(poly, pt) { | |
| 564 | for(var c = false, i = -1, l = poly.length, j = l - 1; ++i < l; j = i) | |
| 565 | ((poly[i][1] <= pt[1] && pt[1] < poly[j][1]) || (poly[j][1] <= pt[1] && pt[1]< poly[i][1])) | |
| 566 | && (pt[0] < (poly[j][0] - poly[i][0]) * (pt[1] - poly[i][1]) / (poly[j][1] - poly[i][1]) + poly[i][0]) | |
| 567 | && (c = !c); | |
| 568 | return c; | |
| 569 | } | |
| 570 | ||
| 571 | function findNearbySlice(mouseX, mouseY) { | |
| 572 | ||
| 573 | var slices = plot.getData(), | |
| 574 | options = plot.getOptions(), | |
| 575 | radius = options.series.pie.radius > 1 ? options.series.pie.radius : maxRadius * options.series.pie.radius, | |
| 576 | x, y; | |
| 577 | ||
| 578 | for (var i = 0; i < slices.length; ++i) { | |
| 579 | ||
| 580 | var s = slices[i]; | |
| 581 | ||
| 582 | if (s.pie.show) { | |
| 583 | ||
| 584 | ctx.save(); | |
| 585 | ctx.beginPath(); | |
| 586 | ctx.moveTo(0, 0); // Center of the pie | |
| 587 | //ctx.scale(1, options.series.pie.tilt); // this actually seems to break everything when here. | |
| 588 | ctx.arc(0, 0, radius, s.startAngle, s.startAngle + s.angle / 2, false); | |
| 589 | ctx.arc(0, 0, radius, s.startAngle + s.angle / 2, s.startAngle + s.angle, false); | |
| 590 | ctx.closePath(); | |
| 591 | x = mouseX - centerLeft; | |
| 592 | y = mouseY - centerTop; | |
| 593 | ||
| 594 | if (ctx.isPointInPath) { | |
| 595 | if (ctx.isPointInPath(mouseX - centerLeft, mouseY - centerTop)) { | |
| 596 | ctx.restore(); | |
| 597 | return { | |
| 598 | datapoint: [s.percent, s.data], | |
| 599 | dataIndex: 0, | |
| 600 | series: s, | |
| 601 | seriesIndex: i | |
| 602 | }; | |
| 603 | } | |
| 604 | } else { | |
| 605 | ||
| 606 | // excanvas for IE doesn;t support isPointInPath, this is a workaround. | |
| 607 | ||
| 608 | var p1X = radius * Math.cos(s.startAngle), | |
| 609 | p1Y = radius * Math.sin(s.startAngle), | |
| 610 | p2X = radius * Math.cos(s.startAngle + s.angle / 4), | |
| 611 | p2Y = radius * Math.sin(s.startAngle + s.angle / 4), | |
| 612 | p3X = radius * Math.cos(s.startAngle + s.angle / 2), | |
| 613 | p3Y = radius * Math.sin(s.startAngle + s.angle / 2), | |
| 614 | p4X = radius * Math.cos(s.startAngle + s.angle / 1.5), | |
| 615 | p4Y = radius * Math.sin(s.startAngle + s.angle / 1.5), | |
| 616 | p5X = radius * Math.cos(s.startAngle + s.angle), | |
| 617 | p5Y = radius * Math.sin(s.startAngle + s.angle), | |
| 618 | arrPoly = [[0, 0], [p1X, p1Y], [p2X, p2Y], [p3X, p3Y], [p4X, p4Y], [p5X, p5Y]], | |
| 619 | arrPoint = [x, y]; | |
| 620 | ||
| 621 | // TODO: perhaps do some mathmatical trickery here with the Y-coordinate to compensate for pie tilt? | |
| 622 | ||
| 623 | if (isPointInPoly(arrPoly, arrPoint)) { | |
| 624 | ctx.restore(); | |
| 625 | return { | |
| 626 | datapoint: [s.percent, s.data], | |
| 627 | dataIndex: 0, | |
| 628 | series: s, | |
| 629 | seriesIndex: i | |
| 630 | }; | |
| 631 | } | |
| 632 | } | |
| 633 | ||
| 634 | ctx.restore(); | |
| 635 | } | |
| 636 | } | |
| 637 | ||
| 638 | return null; | |
| 639 | } | |
| 640 | ||
| 641 | function onMouseMove(e) { | |
| 642 | triggerClickHoverEvent("plothover", e); | |
| 643 | } | |
| 644 | ||
| 645 | function onClick(e) { | |
| 646 | triggerClickHoverEvent("plotclick", e); | |
| 647 | } | |
| 648 | ||
| 649 | // trigger click or hover event (they send the same parameters so we share their code) | |
| 650 | ||
| 651 | function triggerClickHoverEvent(eventname, e) { | |
| 652 | ||
| 653 | var offset = plot.offset(); | |
| 654 | var canvasX = parseInt(e.pageX - offset.left); | |
| 655 | var canvasY = parseInt(e.pageY - offset.top); | |
| 656 | var item = findNearbySlice(canvasX, canvasY); | |
| 657 | ||
| 658 | if (options.grid.autoHighlight) { | |
| 659 | ||
| 660 | // clear auto-highlights | |
| 661 | ||
| 662 | for (var i = 0; i < highlights.length; ++i) { | |
| 663 | var h = highlights[i]; | |
| 664 | if (h.auto == eventname && !(item && h.series == item.series)) { | |
| 665 | unhighlight(h.series); | |
| 666 | } | |
| 667 | } | |
| 668 | } | |
| 669 | ||
| 670 | // highlight the slice | |
| 671 | ||
| 672 | if (item) { | |
| 673 | highlight(item.series, eventname); | |
| 674 | } | |
| 675 | ||
| 676 | // trigger any hover bind events | |
| 677 | ||
| 678 | var pos = { pageX: e.pageX, pageY: e.pageY }; | |
| 679 | target.trigger(eventname, [pos, item]); | |
| 680 | } | |
| 681 | ||
| 682 | function highlight(s, auto) { | |
| 683 | //if (typeof s == "number") { | |
| 684 | // s = series[s]; | |
| 685 | //} | |
| 686 | ||
| 687 | var i = indexOfHighlight(s); | |
| 688 | ||
| 689 | if (i == -1) { | |
| 690 | highlights.push({ series: s, auto: auto }); | |
| 691 | plot.triggerRedrawOverlay(); | |
| 692 | } else if (!auto) { | |
| 693 | highlights[i].auto = false; | |
| 694 | } | |
| 695 | } | |
| 696 | ||
| 697 | function unhighlight(s) { | |
| 698 | if (s == null) { | |
| 699 | highlights = []; | |
| 700 | plot.triggerRedrawOverlay(); | |
| 701 | } | |
| 702 | ||
| 703 | //if (typeof s == "number") { | |
| 704 | // s = series[s]; | |
| 705 | //} | |
| 706 | ||
| 707 | var i = indexOfHighlight(s); | |
| 708 | ||
| 709 | if (i != -1) { | |
| 710 | highlights.splice(i, 1); | |
| 711 | plot.triggerRedrawOverlay(); | |
| 712 | } | |
| 713 | } | |
| 714 | ||
| 715 | function indexOfHighlight(s) { | |
| 716 | for (var i = 0; i < highlights.length; ++i) { | |
| 717 | var h = highlights[i]; | |
| 718 | if (h.series == s) | |
| 719 | return i; | |
| 720 | } | |
| 721 | return -1; | |
| 722 | } | |
| 723 | ||
| 724 | function drawOverlay(plot, octx) { | |
| 725 | ||
| 726 | var options = plot.getOptions(); | |
| 727 | ||
| 728 | var radius = options.series.pie.radius > 1 ? options.series.pie.radius : maxRadius * options.series.pie.radius; | |
| 729 | ||
| 730 | octx.save(); | |
| 731 | octx.translate(centerLeft, centerTop); | |
| 732 | octx.scale(1, options.series.pie.tilt); | |
| 733 | ||
| 734 | for (var i = 0; i < highlights.length; ++i) { | |
| 735 | drawHighlight(highlights[i].series); | |
| 736 | } | |
| 737 | ||
| 738 | drawDonutHole(octx); | |
| 739 | ||
| 740 | octx.restore(); | |
| 741 | ||
| 742 | function drawHighlight(series) { | |
| 743 | ||
| 744 | if (series.angle <= 0 || isNaN(series.angle)) { | |
| 745 | return; | |
| 746 | } | |
| 747 | ||
| 748 | //octx.fillStyle = parseColor(options.series.pie.highlight.color).scale(null, null, null, options.series.pie.highlight.opacity).toString(); | |
| 749 | octx.fillStyle = "rgba(255, 255, 255, " + options.series.pie.highlight.opacity + ")"; // this is temporary until we have access to parseColor | |
| 750 | octx.beginPath(); | |
| 751 | if (Math.abs(series.angle - Math.PI * 2) > 0.000000001) { | |
| 752 | octx.moveTo(0, 0); // Center of the pie | |
| 753 | } | |
| 754 | octx.arc(0, 0, radius, series.startAngle, series.startAngle + series.angle / 2, false); | |
| 755 | octx.arc(0, 0, radius, series.startAngle + series.angle / 2, series.startAngle + series.angle, false); | |
| 756 | octx.closePath(); | |
| 757 | octx.fill(); | |
| 758 | } | |
| 759 | } | |
| 760 | } // end init (plugin body) | |
| 761 | ||
| 762 | // define pie specific options and their default values | |
| 763 | ||
| 764 | var options = { | |
| 765 | series: { | |
| 766 | pie: { | |
| 767 | show: false, | |
| 768 | radius: "auto", // actual radius of the visible pie (based on full calculated radius if <=1, or hard pixel value) | |
| 769 | innerRadius: 0, /* for donut */ | |
| 770 | startAngle: 3/2, | |
| 771 | tilt: 1, | |
| 772 | shadow: { | |
| 773 | left: 5, // shadow left offset | |
| 774 | top: 15, // shadow top offset | |
| 775 | alpha: 0.02 // shadow alpha | |
| 776 | }, | |
| 777 | offset: { | |
| 778 | top: 0, | |
| 779 | left: "auto" | |
| 780 | }, | |
| 781 | stroke: { | |
| 782 | color: "#fff", | |
| 783 | width: 1 | |
| 784 | }, | |
| 785 | label: { | |
| 786 | show: "auto", | |
| 787 | formatter: function(label, slice) { | |
| 788 | return "<div style='font-size:x-small;text-align:center;padding:2px;color:" + slice.color + ";'>" + label + "<br/>" + Math.round(slice.percent) + "%</div>"; | |
| 789 | }, // formatter function | |
| 790 | radius: 1, // radius at which to place the labels (based on full calculated radius if <=1, or hard pixel value) | |
| 791 | background: { | |
| 792 | color: null, | |
| 793 | opacity: 0 | |
| 794 | }, | |
| 795 | threshold: 0 // percentage at which to hide the label (i.e. the slice is too narrow) | |
| 796 | }, | |
| 797 | combine: { | |
| 798 | threshold: -1, // percentage at which to combine little slices into one larger slice | |
| 799 | color: null, // color to give the new slice (auto-generated if null) | |
| 800 | label: "Other" // label to give the new slice | |
| 801 | }, | |
| 802 | highlight: { | |
| 803 | //color: "#fff", // will add this functionality once parseColor is available | |
| 804 | opacity: 0.5 | |
| 805 | } | |
| 806 | } | |
| 807 | } | |
| 808 | }; | |
| 809 | ||
| 810 | $.plot.plugins.push({ | |
| 811 | init: init, | |
| 812 | options: options, | |
| 813 | name: "pie", | |
| 814 | version: "1.1" | |
| 815 | }); | |
| 816 | ||
| 817 | })(jQuery); | |
