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