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