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Editing: jquery.flot.pie.js

/* Flot plugin for rendering pie charts.

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,
			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.off("mousemove").on( 'mousemove', onMouseMove );
				}
				if (options.grid.clickable) {
					eventHolder.off("click").on( '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 (Array.isArray(value) && value.length == 1) {
    				value = value[0];
				}

if (Array.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({
						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;
				}
			} else {
				centerLeft += options.series.pie.offset.left;
			}

if (centerLeft < maxRadius) {
				centerLeft = maxRadius;
			} else if (centerLeft > canvasWidth - maxRadius) {
				centerLeft = canvasWidth - maxRadius;
			}

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

$.plot.plugins.push({
		init: init,
		options: options,
		name: "pie",
		version: "1.1"
	});

})(jQuery);