/* Flot plugin for rendering pie charts. The plugin assumes the data is coming is as a single data value for each series, and each of those values is a positive value or zero (negative numbers don't make any sense and will cause strange effects). The data values do NOT need to be passed in as percentage values because it internally calculates the total and percentages. * Created by Brian Medendorp, June 2009 * Updated November 2009 with contributions from: btburnett3, Anthony Aragues and Xavi Ivars * Changes: 2009-10-22: lineJoin set to round 2009-10-23: IE full circle fix, donut 2009-11-11: Added basic hover from btburnett3 - does not work in IE, and center is off in Chrome and Opera 2009-11-17: Added IE hover capability submitted by Anthony Aragues 2009-11-18: Added bug fix submitted by Xavi Ivars (issues with arrays when other JS libraries are included as well) Available options are: 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 ($) { function init(plot) // this is the "body" of the plugin { var canvas = null; var target = null; var maxRadius = null; var centerLeft = null; var centerTop = null; var total = 0; var redraw = true; var redrawAttempts = 10; var shrink = 0.95; var legendWidth = 0; var processed = false; var raw = false; // interactive variables var highlights = []; // add hook to determine if pie plugin in enabled, and then perform necessary operations plot.hooks.processOptions.push(checkPieEnabled); plot.hooks.bindEvents.push(bindEvents); // check to see if the pie plugin is enabled function checkPieEnabled(plot, options) { if (options.series.pie.show) { //disable grid 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; if (options.series.pie.tilt<0) options.series.pie.tilt=0; // add processData hook to do transformations on the data plot.hooks.processDatapoints.push(processDatapoints); plot.hooks.drawOverlay.push(drawOverlay); // add draw hook plot.hooks.draw.push(draw); } } // bind hoverable events function bindEvents(plot, eventHolder) { var options = plot.getOptions(); if (options.series.pie.show && options.grid.hoverable) eventHolder.unbind('mousemove').mousemove(onMouseMove); if (options.series.pie.show && options.grid.clickable) eventHolder.unbind('click').click(onClick); } // debugging function that prints out an object function alertObject(obj) { var msg = ''; function traverse(obj, depth) { if (!depth) depth = 0; for (var i = 0; i < obj.length; ++i) { for (var j=0; jcanvas.width-maxRadius) centerLeft = canvas.width-maxRadius; } function fixData(data) { for (var i = 0; i < data.length; ++i) { if (typeof(data[i].data)=='number') data[i].data = [[1,data[i].data]]; else if (typeof(data[i].data)=='undefined' || typeof(data[i].data[0])=='undefined') { if (typeof(data[i].data)!='undefined' && typeof(data[i].data.label)!='undefined') data[i].label = data[i].data.label; // fix weirdness coming from flot data[i].data = [[1,0]]; } } return data; } function combine(data) { data = fixData(data); calcTotal(data); var combined = 0; var numCombined = 0; var color = options.series.pie.combine.color; var newdata = []; for (var i = 0; i < data.length; ++i) { // make sure its a number data[i].data[0][1] = parseFloat(data[i].data[0][1]); if (!data[i].data[0][1]) data[i].data[0][1] = 0; if (data[i].data[0][1]/total<=options.series.pie.combine.threshold) { combined += data[i].data[0][1]; numCombined++; if (!color) color = data[i].color; } else { newdata.push({ data: [[1,data[i].data[0][1]]], color: data[i].color, label: data[i].label, angle: (data[i].data[0][1]*(Math.PI*2))/total, percent: (data[i].data[0][1]/total*100) }); } } if (numCombined>0) 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 ctx = newCtx; setupPie(); var slices = plot.getData(); var attempts = 0; while (redraw && attempts0) maxRadius *= shrink; attempts += 1; clear(); if (options.series.pie.tilt<=0.8) drawShadow(); drawPie(); } if (attempts >= redrawAttempts) { clear(); target.prepend('
Could not draw pie with labels contained inside canvas
'); } 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,canvas.width,canvas.height); target.children().filter('.pieLabel, .pieLabelBackground').remove(); } function drawShadow() { var shadowLeft = 5; var shadowTop = 15; var edge = 10; var alpha = 0.02; // set radius if (options.series.pie.radius>1) var radius = options.series.pie.radius; else var radius = maxRadius * options.series.pie.radius; if (radius>=(canvas.width/2)-shadowLeft || radius*options.series.pie.tilt>=(canvas.height/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() { startAngle = Math.PI*options.series.pie.startAngle; // set radius if (options.series.pie.radius>1) var radius = options.series.pie.radius; else var 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 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); // draw labels if (options.series.pie.label.show) drawLabels(); // restore to original state ctx.restore(); function drawSlice(angle, color, fill) { if (angle<=0) 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 else if ($.browser.msie) angle -= 0.0001; //ctx.arc(0,0,radius,0,angle,false); // This doesn't work properly in Opera ctx.arc(0,0,radius,currentAngle,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; // set radius if (options.series.pie.label.radius>1) var radius = options.series.pie.label.radius; else var 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) drawLabel(slices[i], currentAngle, i); currentAngle += slices[i].angle; } function drawLabel(slice, startAngle, index) { if (slice.data[0][1]==0) return; // 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 = '' + text + ""; 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 || canvas.height-(labelTop+label.height())<0 || canvas.width-(labelLeft+label.width())<0) redraw = true; 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;'; $('
').insertBefore(label).css('opacity', options.series.pie.label.background.opacity); } } // 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) { // draw donut hole if(options.series.pie.innerRadius > 0) { // subtract the center layer.save(); 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; 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,false); ctx.closePath(); x = mouseX-centerLeft; y = mouseY-centerTop; if(ctx.isPointInPath) { if (ctx.isPointInPath(mouseX-centerLeft, mouseY-centerTop)) { //alert('found slice!'); 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. 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(), canvasX = parseInt(e.pageX - offset.left), canvasY = parseInt(e.pageY - offset.top), 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) { //alert(options.series.pie.radius); var options = plot.getOptions(); //alert(options.series.pie.radius); 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 (i = 0; i < highlights.length; ++i) drawHighlight(highlights[i].series); drawDonutHole(octx); octx.restore(); function drawHighlight(series) { if (series.angle < 0) 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,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, offset: { top: 0, left: 'auto' }, stroke: { color: '#FFF', width: 1 }, label: { show: 'auto', formatter: function(label, slice){ return '
'+label+'
'+Math.round(slice.percent)+'%
'; }, // 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: "1.0" }); })(jQuery);