File: js/flot_plugin/jquery.flot.pie.js

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File: js/flot_plugin/jquery.flot.pie.js
Role: Auxiliary script
Content type: text/plain
Description: Auxiliary script
Class: jQuery Calx
Calculate form input values based on formulas
Author: By
Last change: Update of js/flot_plugin/jquery.flot.pie.js
Date: 2 years ago
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/* Flot plugin for rendering pie charts. Copyright (c) 2007-2014 IOLA and Ole Laursen. Licensed under the MIT license. The plugin assumes that each series has a single data value, and that each value is a positive integer or zero. Negative numbers don't make sense for a pie chart, and have unpredictable results. The values do NOT need to be passed in as percentages; the plugin will calculate the total and per-slice percentages internally. * Created by Brian Medendorp * Updated with contributions from btburnett3, Anthony Aragues and Xavi Ivars The plugin supports these options: series: { pie: { show: true/false radius: 0-1 for percentage of fullsize, or a specified pixel length, or 'auto' innerRadius: 0-1 for percentage of fullsize or a specified pixel length, for creating a donut effect 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 tilt: 0-1 for percentage to tilt the pie, where 1 is no tilt, and 0 is completely flat (nothing will show) offset: { top: integer value to move the pie up or down left: integer value to move the pie left or right, or 'auto' }, stroke: { color: any hexidecimal color value (other formats may or may not work, so best to stick with something like '#FFF') width: integer pixel width of the stroke }, label: { show: true/false, or 'auto' formatter: a user-defined function that modifies the text/style of the label text radius: 0-1 for percentage of fullsize, or a specified pixel length background: { color: any hexidecimal color value (other formats may or may not work, so best to stick with something like '#000') opacity: 0-1 }, threshold: 0-1 for the percentage value at which to hide labels (if they're too small) }, combine: { threshold: 0-1 for the percentage value at which to combine slices (if they're too small) 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 label: any text value of what the combined slice should be labeled } highlight: { opacity: 0-1 } } } More detail and specific examples can be found in the included HTML file. */ (function($) { // Maximum redraw attempts when fitting labels within the plot var REDRAW_ATTEMPTS = 10; // Factor by which to shrink the pie when fitting labels within the plot var REDRAW_SHRINK = 0.95; function init(plot) { var canvas = null, target = null, options = null, maxRadius = null, centerLeft = null, centerTop = null, processed = false, ctx = null; // interactive variables var highlights = []; // add hook to determine if pie plugin in enabled, and then perform necessary operations plot.hooks.processOptions.push(function(plot, options) { if (options.series.pie.show) { options.grid.show = false; // set labels.show if (options.series.pie.label.show == "auto") { if (options.legend.show) { options.series.pie.label.show = false; } else { options.series.pie.label.show = true; } } // set radius if (options.series.pie.radius == "auto") { if (options.series.pie.label.show) { options.series.pie.radius = 3/4; } else { options.series.pie.radius = 1; } } // ensure sane tilt if (options.series.pie.tilt > 1) { options.series.pie.tilt = 1; } else if (options.series.pie.tilt < 0) { options.series.pie.tilt = 0; } } }); plot.hooks.bindEvents.push(function(plot, eventHolder) { var options = plot.getOptions(); if (options.series.pie.show) { if (options.grid.hoverable) { eventHolder.unbind("mousemove").mousemove(onMouseMove); } if (options.grid.clickable) { eventHolder.unbind("click").click(onClick); } } }); plot.hooks.processDatapoints.push(function(plot, series, data, datapoints) { var options = plot.getOptions(); if (options.series.pie.show) { processDatapoints(plot, series, data, datapoints); } }); plot.hooks.drawOverlay.push(function(plot, octx) { var options = plot.getOptions(); if (options.series.pie.show) { drawOverlay(plot, octx); } }); plot.hooks.draw.push(function(plot, newCtx) { var options = plot.getOptions(); if (options.series.pie.show) { draw(plot, newCtx); } }); function processDatapoints(plot, series, datapoints) { if (!processed) { processed = true; canvas = plot.getCanvas(); target = $(canvas).parent(); options = plot.getOptions(); plot.setData(combine(plot.getData())); } } function combine(data) { var total = 0, combined = 0, numCombined = 0, color = options.series.pie.combine.color, newdata = []; // Fix up the raw data from Flot, ensuring the data is numeric for (var i = 0; i < data.length; ++i) { var value = data[i].data; // If the data is an array, we'll assume that it's a standard // Flot x-y pair, and are concerned only with the second value. // Note how we use the original array, rather than creating a // new one; this is more efficient and preserves any extra data // that the user may have stored in higher indexes. if ($.isArray(value) && value.length == 1) { value = value[0]; } if ($.isArray(value)) { // Equivalent to $.isNumeric() but compatible with jQuery < 1.7 if (!isNaN(parseFloat(value[1])) && isFinite(value[1])) { value[1] = +value[1]; } else { value[1] = 0; } } else if (!isNaN(parseFloat(value)) && isFinite(value)) { value = [1, +value]; } else { value = [1, 0]; } data[i].data = [value]; } // Sum up all the slices, so we can calculate percentages for each for (var i = 0; i < data.length; ++i) { total += data[i].data[0][1]; } // Count the number of slices with percentages below the combine // threshold; if it turns out to be just one, we won't combine. for (var i = 0; i < data.length; ++i) { var value = data[i].data[0][1]; if (value / total <= options.series.pie.combine.threshold) { combined += value; numCombined++; if (!color) { color = data[i].color; } } } for (var i = 0; i < data.length; ++i) { var value = data[i].data[0][1]; if (numCombined < 2 || value / total > options.series.pie.combine.threshold) { newdata.push( $.extend(data[i], { /* extend to allow keeping all other original data values and using them e.g. in labelFormatter. */ data: [[1, value]], color: data[i].color, label: data[i].label, angle: value * Math.PI * 2 / total, percent: value / (total / 100) }) ); } } if (numCombined > 1) { newdata.push({ data: [[1, combined]], color: color, label: options.series.pie.combine.label, angle: combined * Math.PI * 2 / total, percent: combined / (total / 100) }); } return newdata; } function draw(plot, newCtx) { if (!target) { return; // if no series were passed } var canvasWidth = plot.getPlaceholder().width(), canvasHeight = plot.getPlaceholder().height(), legendWidth = target.children().filter(".legend").children().width() || 0; ctx = newCtx; // WARNING: HACK! REWRITE THIS CODE AS SOON AS POSSIBLE! // When combining smaller slices into an 'other' slice, we need to // add a new series. Since Flot gives plugins no way to modify the // list of series, the pie plugin uses a hack where the first call // to processDatapoints results in a call to setData with the new // list of series, then subsequent processDatapoints do nothing. // The plugin-global 'processed' flag is used to control this hack; // it starts out false, and is set to true after the first call to // processDatapoints. // Unfortunately this turns future setData calls into no-ops; they // call processDatapoints, the flag is true, and nothing happens. // To fix this we'll set the flag back to false here in draw, when // all series have been processed, so the next sequence of calls to // processDatapoints once again starts out with a slice-combine. // This is really a hack; in 0.9 we need to give plugins a proper // way to modify series before any processing begins. processed = false; // calculate maximum radius and center point maxRadius = Math.min(canvasWidth, canvasHeight / options.series.pie.tilt) / 2; centerTop = canvasHeight / 2 + options.series.pie.offset.top; centerLeft = canvasWidth / 2; if (options.series.pie.offset.left == "auto") { if (options.legend.position.match("w")) { centerLeft += legendWidth / 2; } else { centerLeft -= legendWidth / 2; } if (centerLeft < maxRadius) { centerLeft = maxRadius; } else if (centerLeft > canvasWidth - maxRadius) { centerLeft = canvasWidth - maxRadius; } } else { centerLeft += options.series.pie.offset.left; } var slices = plot.getData(), attempts = 0; // Keep shrinking the pie's radius until drawPie returns true, // indicating that all the labels fit, or we try too many times. do { if (attempts > 0) { maxRadius *= REDRAW_SHRINK; } attempts += 1; clear(); if (options.series.pie.tilt <= 0.8) { drawShadow(); } } while (!drawPie() && attempts < REDRAW_ATTEMPTS) if (attempts >= REDRAW_ATTEMPTS) { clear(); target.prepend("<div class='error'>Could not draw pie with labels contained inside canvas</div>"); } if (plot.setSeries && plot.insertLegend) { plot.setSeries(slices); plot.insertLegend(); } // we're actually done at this point, just defining internal functions at this point function clear() { ctx.clearRect(0, 0, canvasWidth, canvasHeight); target.children().filter(".pieLabel, .pieLabelBackground").remove(); } function drawShadow() { var shadowLeft = options.series.pie.shadow.left; var shadowTop = options.series.pie.shadow.top; var edge = 10; var alpha = options.series.pie.shadow.alpha; var radius = options.series.pie.radius > 1 ? options.series.pie.radius : maxRadius * options.series.pie.radius; if (radius >= canvasWidth / 2 - shadowLeft || radius * options.series.pie.tilt >= canvasHeight / 2 - shadowTop || radius <= edge) { return; // shadow would be outside canvas, so don't draw it } ctx.save(); ctx.translate(shadowLeft,shadowTop); ctx.globalAlpha = alpha; ctx.fillStyle = "#000"; // center and rotate to starting position ctx.translate(centerLeft,centerTop); ctx.scale(1, options.series.pie.tilt); //radius -= edge; for (var i = 1; i <= edge; i++) { ctx.beginPath(); ctx.arc(0, 0, radius, 0, Math.PI * 2, false); ctx.fill(); radius -= i; } ctx.restore(); } function drawPie() { var startAngle = Math.PI * options.series.pie.startAngle; var radius = options.series.pie.radius > 1 ? options.series.pie.radius : maxRadius * options.series.pie.radius; // center and rotate to starting position ctx.save(); ctx.translate(centerLeft,centerTop); ctx.scale(1, options.series.pie.tilt); //ctx.rotate(startAngle); // start at top; -- This doesn't work properly in Opera // draw slices ctx.save(); var currentAngle = startAngle; for (var i = 0; i < slices.length; ++i) { slices[i].startAngle = currentAngle; drawSlice(slices[i].angle, slices[i].color, true); } ctx.restore(); // draw slice outlines if (options.series.pie.stroke.width > 0) { ctx.save(); ctx.lineWidth = options.series.pie.stroke.width; currentAngle = startAngle; for (var i = 0; i < slices.length; ++i) { drawSlice(slices[i].angle, options.series.pie.stroke.color, false); } ctx.restore(); } // draw donut hole drawDonutHole(ctx); ctx.restore(); // Draw the labels, returning true if they fit within the plot if (options.series.pie.label.show) { return drawLabels(); } else return true; function drawSlice(angle, color, fill) { if (angle <= 0 || isNaN(angle)) { return; } if (fill) { ctx.fillStyle = color; } else { ctx.strokeStyle = color; ctx.lineJoin = "round"; } ctx.beginPath(); if (Math.abs(angle - Math.PI * 2) > 0.000000001) { ctx.moveTo(0, 0); // Center of the pie } //ctx.arc(0, 0, radius, 0, angle, false); // This doesn't work properly in Opera ctx.arc(0, 0, radius,currentAngle, currentAngle + angle / 2, false); ctx.arc(0, 0, radius,currentAngle + angle / 2, currentAngle + angle, false); ctx.closePath(); //ctx.rotate(angle); // This doesn't work properly in Opera currentAngle += angle; if (fill) { ctx.fill(); } else { ctx.stroke(); } } function drawLabels() { var currentAngle = startAngle; var radius = options.series.pie.label.radius > 1 ? options.series.pie.label.radius : maxRadius * options.series.pie.label.radius; for (var i = 0; i < slices.length; ++i) { if (slices[i].percent >= options.series.pie.label.threshold * 100) { if (!drawLabel(slices[i], currentAngle, i)) { return false; } } currentAngle += slices[i].angle; } return true; function drawLabel(slice, startAngle, index) { if (slice.data[0][1] == 0) { return true; } // format label text var lf = options.legend.labelFormatter, text, plf = options.series.pie.label.formatter; if (lf) { text = lf(slice.label, slice); } else { text = slice.label; } if (plf) { text = plf(text, slice); } var halfAngle = ((startAngle + slice.angle) + startAngle) / 2; var x = centerLeft + Math.round(Math.cos(halfAngle) * radius); var y = centerTop + Math.round(Math.sin(halfAngle) * radius) * options.series.pie.tilt; var html = "<span class='pieLabel' id='pieLabel" + index + "' style='position:absolute;top:" + y + "px;left:" + x + "px;'>" + text + "</span>"; target.append(html); var label = target.children("#pieLabel" + index); var labelTop = (y - label.height() / 2); var labelLeft = (x - label.width() / 2); label.css("top", labelTop); label.css("left", labelLeft); // check to make sure that the label is not outside the canvas if (0 - labelTop > 0 || 0 - labelLeft > 0 || canvasHeight - (labelTop + label.height()) < 0 || canvasWidth - (labelLeft + label.width()) < 0) { return false; } if (options.series.pie.label.background.opacity != 0) { // put in the transparent background separately to avoid blended labels and label boxes var c = options.series.pie.label.background.color; if (c == null) { c = slice.color; } var pos = "top:" + labelTop + "px;left:" + labelLeft + "px;"; $("<div class='pieLabelBackground' style='position:absolute;width:" + label.width() + "px;height:" + label.height() + "px;" + pos + "background-color:" + c + ";'></div>") .css("opacity", options.series.pie.label.background.opacity) .insertBefore(label); } return true; } // end individual label function } // end drawLabels function } // end drawPie function } // end draw function // Placed here because it needs to be accessed from multiple locations function drawDonutHole(layer) { if (options.series.pie.innerRadius > 0) { // subtract the center layer.save(); var innerRadius = options.series.pie.innerRadius > 1 ? options.series.pie.innerRadius : maxRadius * options.series.pie.innerRadius; layer.globalCompositeOperation = "destination-out"; // this does not work with excanvas, but it will fall back to using the stroke color layer.beginPath(); layer.fillStyle = options.series.pie.stroke.color; layer.arc(0, 0, innerRadius, 0, Math.PI * 2, false); layer.fill(); layer.closePath(); layer.restore(); // add inner stroke layer.save(); layer.beginPath(); layer.strokeStyle = options.series.pie.stroke.color; layer.arc(0, 0, innerRadius, 0, Math.PI * 2, false); layer.stroke(); layer.closePath(); layer.restore(); // TODO: add extra shadow inside hole (with a mask) if the pie is tilted. } } //-- Additional Interactive related functions -- function isPointInPoly(poly, pt) { for(var c = false, i = -1, l = poly.length, j = l - 1; ++i < l; j = i) ((poly[i][1] <= pt[1] && pt[1] < poly[j][1]) || (poly[j][1] <= pt[1] && pt[1]< poly[i][1])) && (pt[0] < (poly[j][0] - poly[i][0]) * (pt[1] - poly[i][1]) / (poly[j][1] - poly[i][1]) + poly[i][0]) && (c = !c); return c; } function findNearbySlice(mouseX, mouseY) { var slices = plot.getData(), options = plot.getOptions(), radius = options.series.pie.radius > 1 ? options.series.pie.radius : maxRadius * options.series.pie.radius, x, y; for (var i = 0; i < slices.length; ++i) { var s = slices[i]; if (s.pie.show) { ctx.save(); ctx.beginPath(); ctx.moveTo(0, 0); // Center of the pie //ctx.scale(1, options.series.pie.tilt); // this actually seems to break everything when here. ctx.arc(0, 0, radius, s.startAngle, s.startAngle + s.angle / 2, false); ctx.arc(0, 0, radius, s.startAngle + s.angle / 2, s.startAngle + s.angle, false); ctx.closePath(); x = mouseX - centerLeft; y = mouseY - centerTop; if (ctx.isPointInPath) { if (ctx.isPointInPath(mouseX - centerLeft, mouseY - centerTop)) { ctx.restore(); return { datapoint: [s.percent, s.data], dataIndex: 0, series: s, seriesIndex: i }; } } else { // excanvas for IE doesn;t support isPointInPath, this is a workaround. var p1X = radius * Math.cos(s.startAngle), p1Y = radius * Math.sin(s.startAngle), p2X = radius * Math.cos(s.startAngle + s.angle / 4), p2Y = radius * Math.sin(s.startAngle + s.angle / 4), p3X = radius * Math.cos(s.startAngle + s.angle / 2), p3Y = radius * Math.sin(s.startAngle + s.angle / 2), p4X = radius * Math.cos(s.startAngle + s.angle / 1.5), p4Y = radius * Math.sin(s.startAngle + s.angle / 1.5), p5X = radius * Math.cos(s.startAngle + s.angle), p5Y = radius * Math.sin(s.startAngle + s.angle), arrPoly = [[0, 0], [p1X, p1Y], [p2X, p2Y], [p3X, p3Y], [p4X, p4Y], [p5X, p5Y]], arrPoint = [x, y]; // TODO: perhaps do some mathmatical trickery here with the Y-coordinate to compensate for pie tilt? if (isPointInPoly(arrPoly, arrPoint)) { ctx.restore(); return { datapoint: [s.percent, s.data], dataIndex: 0, series: s, seriesIndex: i }; } } ctx.restore(); } } return null; } function onMouseMove(e) { triggerClickHoverEvent("plothover", e); } function onClick(e) { triggerClickHoverEvent("plotclick", e); } // trigger click or hover event (they send the same parameters so we share their code) function triggerClickHoverEvent(eventname, e) { var offset = plot.offset(); var canvasX = parseInt(e.pageX - offset.left); var canvasY = parseInt(e.pageY - offset.top); var item = findNearbySlice(canvasX, canvasY); if (options.grid.autoHighlight) { // clear auto-highlights for (var i = 0; i < highlights.length; ++i) { var h = highlights[i]; if (h.auto == eventname && !(item && h.series == item.series)) { unhighlight(h.series); } } } // highlight the slice if (item) { highlight(item.series, eventname); } // trigger any hover bind events var pos = { pageX: e.pageX, pageY: e.pageY }; target.trigger(eventname, [pos, item]); } function highlight(s, auto) { //if (typeof s == "number") { // s = series[s]; //} var i = indexOfHighlight(s); if (i == -1) { highlights.push({ series: s, auto: auto }); plot.triggerRedrawOverlay(); } else if (!auto) { highlights[i].auto = false; } } function unhighlight(s) { if (s == null) { highlights = []; plot.triggerRedrawOverlay(); } //if (typeof s == "number") { // s = series[s]; //} var i = indexOfHighlight(s); if (i != -1) { highlights.splice(i, 1); plot.triggerRedrawOverlay(); } } function indexOfHighlight(s) { for (var i = 0; i < highlights.length; ++i) { var h = highlights[i]; if (h.series == s) return i; } return -1; } function drawOverlay(plot, octx) { var options = plot.getOptions(); var radius = options.series.pie.radius > 1 ? options.series.pie.radius : maxRadius * options.series.pie.radius; octx.save(); octx.translate(centerLeft, centerTop); octx.scale(1, options.series.pie.tilt); for (var i = 0; i < highlights.length; ++i) { drawHighlight(highlights[i].series); } drawDonutHole(octx); octx.restore(); function drawHighlight(series) { if (series.angle <= 0 || isNaN(series.angle)) { return; } //octx.fillStyle = parseColor(options.series.pie.highlight.color).scale(null, null, null, options.series.pie.highlight.opacity).toString(); octx.fillStyle = "rgba(255, 255, 255, " + options.series.pie.highlight.opacity + ")"; // this is temporary until we have access to parseColor octx.beginPath(); if (Math.abs(series.angle - Math.PI * 2) > 0.000000001) { octx.moveTo(0, 0); // Center of the pie } octx.arc(0, 0, radius, series.startAngle, series.startAngle + series.angle / 2, false); octx.arc(0, 0, radius, series.startAngle + series.angle / 2, series.startAngle + series.angle, false); octx.closePath(); octx.fill(); } } } // end init (plugin body) // define pie specific options and their default values var options = { series: { pie: { show: false, radius: "auto", // actual radius of the visible pie (based on full calculated radius if <=1, or hard pixel value) innerRadius: 0, /* for donut */ startAngle: 3/2, tilt: 1, shadow: { left: 5, // shadow left offset top: 15, // shadow top offset alpha: 0.02 // shadow alpha }, offset: { top: 0, left: "auto" }, stroke: { color: "#fff", width: 1 }, label: { show: "auto", formatter: function(label, slice) { return "<div style='font-size:x-small;text-align:center;padding:2px;color:" + slice.color + ";'>" + label + "<br/>" + Math.round(slice.percent) + "%</div>"; }, // formatter function radius: 1, // radius at which to place the labels (based on full calculated radius if <=1, or hard pixel value) background: { color: null, opacity: 0 }, threshold: 0 // percentage at which to hide the label (i.e. the slice is too narrow) }, combine: { threshold: -1, // percentage at which to combine little slices into one larger slice color: null, // color to give the new slice (auto-generated if null) label: "Other" // label to give the new slice }, highlight: { //color: "#fff", // will add this functionality once parseColor is available opacity: 0.5 } } } }; $.plot.plugins.push({ init: init, options: options, name: "pie", version: "1.1" }); })(jQuery);