Subversion Repositories SmartDukaan

/*

Flot plugin for rendering pie charts. The plugin assumes the data is 

coming is as a single data value for each series, and each of those 

values is a positive value or zero (negative numbers don't make 

any sense and will cause strange effects). The data values do 

NOT need to be passed in as percentage values because it 

internally calculates the total and percentages.

* Created by Brian Medendorp, June 2009

* Updated November 2009 with contributions from: btburnett3, Anthony Aragues and Xavi Ivars

* Changes:

	2009-10-22: lineJoin set to round

	2009-10-23: IE full circle fix, donut

	2009-11-11: Added basic hover from btburnett3 - does not work in IE, and center is off in Chrome and Opera

	2009-11-17: Added IE hover capability submitted by Anthony Aragues

	2009-11-18: Added bug fix submitted by Xavi Ivars (issues with arrays when other JS libraries are included as well)

Available options are:

series: {

	pie: {

		show: true/false

		radius: 0-1 for percentage of fullsize, or a specified pixel length, or 'auto'

		innerRadius: 0-1 for percentage of fullsize or a specified pixel length, for creating a donut effect

		startAngle: 0-2 factor of PI used for starting angle (in radians) i.e 3/2 starts at the top, 0 and 2 have the same result

		tilt: 0-1 for percentage to tilt the pie, where 1 is no tilt, and 0 is completely flat (nothing will show)

		offset: {

			top: integer value to move the pie up or down

			left: integer value to move the pie left or right, or 'auto'

		},

		stroke: {

			color: any hexidecimal color value (other formats may or may not work, so best to stick with something like '#FFF')

			width: integer pixel width of the stroke

		},

		label: {

			show: true/false, or 'auto'

			formatter:  a user-defined function that modifies the text/style of the label text

			radius: 0-1 for percentage of fullsize, or a specified pixel length

			background: {

				color: any hexidecimal color value (other formats may or may not work, so best to stick with something like '#000')

				opacity: 0-1

			},

			threshold: 0-1 for the percentage value at which to hide labels (if they're too small)

		},

		combine: {

			threshold: 0-1 for the percentage value at which to combine slices (if they're too small)

			color: any hexidecimal color value (other formats may or may not work, so best to stick with something like '#CCC'), if null, the plugin will automatically use the color of the first slice to be combined

			label: any text value of what the combined slice should be labeled

		}

		highlight: {

			opacity: 0-1

		}

	}

}

More detail and specific examples can be found in the included HTML file.

*/

(function ($) 

{

	function init(plot) // this is the "body" of the plugin

	{

		var canvas = null;

		var target = null;

		var maxRadius = null;

		var centerLeft = null;

		var centerTop = null;

		var total = 0;

		var redraw = true;

		var redrawAttempts = 10;

		var shrink = 0.95;

		var legendWidth = 0;

		var processed = false;

		var raw = false;

		// interactive variables	

		var highlights = [];	

		// add hook to determine if pie plugin in enabled, and then perform necessary operations

		plot.hooks.processOptions.push(checkPieEnabled);

		plot.hooks.bindEvents.push(bindEvents);	

		// check to see if the pie plugin is enabled

		function checkPieEnabled(plot, options)

		{

			if (options.series.pie.show)

			{

				//disable grid

				options.grid.show = false;

				// set labels.show

				if (options.series.pie.label.show=='auto')

					if (options.legend.show)

						options.series.pie.label.show = false;

					else

						options.series.pie.label.show = true;

				// set radius

				if (options.series.pie.radius=='auto')

					if (options.series.pie.label.show)

						options.series.pie.radius = 3/4;

					else

						options.series.pie.radius = 1;

				// ensure sane tilt

				if (options.series.pie.tilt>1)

					options.series.pie.tilt=1;

				if (options.series.pie.tilt<0)

					options.series.pie.tilt=0;

				// add processData hook to do transformations on the data

				plot.hooks.processDatapoints.push(processDatapoints);

				plot.hooks.drawOverlay.push(drawOverlay);	

				// add draw hook

				plot.hooks.draw.push(draw);

			}

		}

		// bind hoverable events

		function bindEvents(plot, eventHolder) 		

		{		

			var options = plot.getOptions();

			if (options.series.pie.show && options.grid.hoverable)

				eventHolder.unbind('mousemove').mousemove(onMouseMove);

			if (options.series.pie.show && options.grid.clickable)

				eventHolder.unbind('click').click(onClick);

		}	

		// debugging function that prints out an object

		function alertObject(obj)

		{

			var msg = '';

			function traverse(obj, depth)

			{

				if (!depth)

					depth = 0;

				for (var i = 0; i < obj.length; ++i)

				{

					for (var j=0; j<depth; j++)

						msg += '\t';

					if( typeof obj[i] == "object")

					{	// its an object

						msg += ''+i+':\n';

						traverse(obj[i], depth+1);

					}

					else

					{	// its a value

						msg += ''+i+': '+obj[i]+'\n';

					}

				}

			}

			traverse(obj);

			alert(msg);

		}

		function calcTotal(data)

		{

			for (var i = 0; i < data.length; ++i)

			{

				var item = parseFloat(data[i].data[0][1]);

				if (item)

					total += item;

			}

		}	

		function processDatapoints(plot, series, data, datapoints) 

		{	

			if (!processed)

			{

				processed = true;

				canvas = plot.getCanvas();

				target = $(canvas).parent();

				options = plot.getOptions();

				plot.setData(combine(plot.getData()));

			}

		}

		function setupPie()

		{

			legendWidth = target.children().filter('.legend').children().width();

			// calculate maximum radius and center point

			maxRadius =  Math.min(canvas.width,(canvas.height/options.series.pie.tilt))/2;

			centerTop = (canvas.height/2)+options.series.pie.offset.top;

			centerLeft = (canvas.width/2);

			if (options.series.pie.offset.left=='auto')

				if (options.legend.position.match('w'))

					centerLeft += legendWidth/2;

				else

					centerLeft -= legendWidth/2;

			else

				centerLeft += options.series.pie.offset.left;

			if (centerLeft<maxRadius)

				centerLeft = maxRadius;

			else if (centerLeft>canvas.width-maxRadius)

				centerLeft = canvas.width-maxRadius;

		}

		function fixData(data)

		{

			for (var i = 0; i < data.length; ++i)

			{

				if (typeof(data[i].data)=='number')

					data[i].data = [[1,data[i].data]];

				else if (typeof(data[i].data)=='undefined' || typeof(data[i].data[0])=='undefined')

				{

					if (typeof(data[i].data)!='undefined' && typeof(data[i].data.label)!='undefined')

						data[i].label = data[i].data.label; // fix weirdness coming from flot

					data[i].data = [[1,0]];

				}

			}

			return data;

		}

		function combine(data)

		{

			data = fixData(data);

			calcTotal(data);

			var combined = 0;

			var numCombined = 0;

			var color = options.series.pie.combine.color;

			var newdata = [];

			for (var i = 0; i < data.length; ++i)

			{

				// make sure its a number

				data[i].data[0][1] = parseFloat(data[i].data[0][1]);

				if (!data[i].data[0][1])

					data[i].data[0][1] = 0;

				if (data[i].data[0][1]/total<=options.series.pie.combine.threshold)

				{

					combined += data[i].data[0][1];

					numCombined++;

					if (!color)

						color = data[i].color;

				}				

				else

				{

					newdata.push({

						data: [[1,data[i].data[0][1]]], 

						color: data[i].color, 

						label: data[i].label,

						angle: (data[i].data[0][1]*(Math.PI*2))/total,

						percent: (data[i].data[0][1]/total*100)

					});

				}

			}

			if (numCombined>0)

				newdata.push({

					data: [[1,combined]], 

					color: color, 

					label: options.series.pie.combine.label,

					angle: (combined*(Math.PI*2))/total,

					percent: (combined/total*100)

				});

			return newdata;

		}		

		function draw(plot, newCtx)

		{

			if (!target) return; // if no series were passed

			ctx = newCtx;

			setupPie();

			var slices = plot.getData();

			var attempts = 0;

			while (redraw && attempts<redrawAttempts)

			{

				redraw = false;

				if (attempts>0)

					maxRadius *= shrink;

				attempts += 1;

				clear();

				if (options.series.pie.tilt<=0.8)

					drawShadow();

				drawPie();

			}

			if (attempts >= redrawAttempts) {

				clear();

				target.prepend('<div class="error">Could not draw pie with labels contained inside canvas</div>');

			}

			if ( plot.setSeries && plot.insertLegend )

			{

				plot.setSeries(slices);

				plot.insertLegend();

			}

			// we're actually done at this point, just defining internal functions at this point

			function clear()

			{

				ctx.clearRect(0,0,canvas.width,canvas.height);

				target.children().filter('.pieLabel, .pieLabelBackground').remove();

			}

			function drawShadow()

			{

				var shadowLeft = 5;

				var shadowTop = 15;

				var edge = 10;

				var alpha = 0.02;

				// set radius

				if (options.series.pie.radius>1)

					var radius = options.series.pie.radius;

				else

					var radius = maxRadius * options.series.pie.radius;

				if (radius>=(canvas.width/2)-shadowLeft || radius*options.series.pie.tilt>=(canvas.height/2)-shadowTop || radius<=edge)

					return;	// shadow would be outside canvas, so don't draw it

				ctx.save();

				ctx.translate(shadowLeft,shadowTop);

				ctx.globalAlpha = alpha;

				ctx.fillStyle = '#000';

				// center and rotate to starting position

				ctx.translate(centerLeft,centerTop);

				ctx.scale(1, options.series.pie.tilt);

				//radius -= edge;

				for (var i=1; i<=edge; i++)

				{

					ctx.beginPath();

					ctx.arc(0,0,radius,0,Math.PI*2,false);

					ctx.fill();

					radius -= i;

				}	

				ctx.restore();

			}

			function drawPie()

			{

				startAngle = Math.PI*options.series.pie.startAngle;

				// set radius

				if (options.series.pie.radius>1)

					var radius = options.series.pie.radius;

				else

					var radius = maxRadius * options.series.pie.radius;

				// center and rotate to starting position

				ctx.save();

				ctx.translate(centerLeft,centerTop);

				ctx.scale(1, options.series.pie.tilt);

				//ctx.rotate(startAngle); // start at top; -- This doesn't work properly in Opera

				// draw slices

				ctx.save();

				var currentAngle = startAngle;

				for (var i = 0; i < slices.length; ++i)

				{

					slices[i].startAngle = currentAngle;

					drawSlice(slices[i].angle, slices[i].color, true);

				}

				ctx.restore();

				// draw slice outlines

				ctx.save();

				ctx.lineWidth = options.series.pie.stroke.width;

				currentAngle = startAngle;

				for (var i = 0; i < slices.length; ++i)

					drawSlice(slices[i].angle, options.series.pie.stroke.color, false);

				ctx.restore();

				// draw donut hole

				drawDonutHole(ctx);

				// draw labels

				if (options.series.pie.label.show)

					drawLabels();

				// restore to original state

				ctx.restore();

				function drawSlice(angle, color, fill)

				{	

					if (angle<=0)

						return;

					if (fill)

						ctx.fillStyle = color;

					else

					{

						ctx.strokeStyle = color;

						ctx.lineJoin = 'round';

					}

					ctx.beginPath();

					if (Math.abs(angle - Math.PI*2) > 0.000000001)

						ctx.moveTo(0,0); // Center of the pie

					else if ($.browser.msie)

						angle -= 0.0001;

					//ctx.arc(0,0,radius,0,angle,false); // This doesn't work properly in Opera

					ctx.arc(0,0,radius,currentAngle,currentAngle+angle,false);

					ctx.closePath();

					//ctx.rotate(angle); // This doesn't work properly in Opera

					currentAngle += angle;

					if (fill)

						ctx.fill();

					else

						ctx.stroke();

				}

				function drawLabels()

				{

					var currentAngle = startAngle;

					// set radius

					if (options.series.pie.label.radius>1)

						var radius = options.series.pie.label.radius;

					else

						var radius = maxRadius * options.series.pie.label.radius;

					for (var i = 0; i < slices.length; ++i)

					{

						if (slices[i].percent >= options.series.pie.label.threshold*100)

							drawLabel(slices[i], currentAngle, i);

						currentAngle += slices[i].angle;

					}

					function drawLabel(slice, startAngle, index)

					{

						if (slice.data[0][1]==0)

							return;

						// format label text

						var lf = options.legend.labelFormatter, text, plf = options.series.pie.label.formatter;

						if (lf)

							text = lf(slice.label, slice);

						else

							text = slice.label;

						if (plf)

							text = plf(text, slice);

						var halfAngle = ((startAngle+slice.angle) + startAngle)/2;

						var x = centerLeft + Math.round(Math.cos(halfAngle) * radius);

						var y = centerTop + Math.round(Math.sin(halfAngle) * radius) * options.series.pie.tilt;

						var html = '<span class="pieLabel" id="pieLabel'+index+'" style="position:absolute;top:' + y + 'px;left:' + x + 'px;">' + text + "</span>";

						target.append(html);

						var label = target.children('#pieLabel'+index);

						var labelTop = (y - label.height()/2);

						var labelLeft = (x - label.width()/2);

						label.css('top', labelTop);

						label.css('left', labelLeft);

						// check to make sure that the label is not outside the canvas

						if (0-labelTop>0 || 0-labelLeft>0 || canvas.height-(labelTop+label.height())<0 || canvas.width-(labelLeft+label.width())<0)

							redraw = true;

						if (options.series.pie.label.background.opacity != 0) {

							// put in the transparent background separately to avoid blended labels and label boxes

							var c = options.series.pie.label.background.color;

							if (c == null) {

								c = slice.color;

							}

							var pos = 'top:'+labelTop+'px;left:'+labelLeft+'px;';

							$('<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);

						}

					} // end individual label function

				} // end drawLabels function

			} // end drawPie function

		} // end draw function

		// Placed here because it needs to be accessed from multiple locations 

		function drawDonutHole(layer)

		{

			// draw donut hole

			if(options.series.pie.innerRadius > 0)

			{

				// subtract the center

				layer.save();

				innerRadius = options.series.pie.innerRadius > 1 ? options.series.pie.innerRadius : maxRadius * options.series.pie.innerRadius;

				layer.globalCompositeOperation = 'destination-out'; // this does not work with excanvas, but it will fall back to using the stroke color

				layer.beginPath();

				layer.fillStyle = options.series.pie.stroke.color;

				layer.arc(0,0,innerRadius,0,Math.PI*2,false);

				layer.fill();

				layer.closePath();

				layer.restore();

				// add inner stroke

				layer.save();

				layer.beginPath();

				layer.strokeStyle = options.series.pie.stroke.color;

				layer.arc(0,0,innerRadius,0,Math.PI*2,false);

				layer.stroke();

				layer.closePath();

				layer.restore();

				// TODO: add extra shadow inside hole (with a mask) if the pie is tilted.

			}

		}

		//-- Additional Interactive related functions --

		function isPointInPoly(poly, pt)

		{

			for(var c = false, i = -1, l = poly.length, j = l - 1; ++i < l; j = i)

				((poly[i][1] <= pt[1] && pt[1] < poly[j][1]) || (poly[j][1] <= pt[1] && pt[1]< poly[i][1]))

				&& (pt[0] < (poly[j][0] - poly[i][0]) * (pt[1] - poly[i][1]) / (poly[j][1] - poly[i][1]) + poly[i][0])

				&& (c = !c);

			return c;

		}

		function findNearbySlice(mouseX, mouseY)

		{

			var slices = plot.getData(),

				options = plot.getOptions(),

				radius = options.series.pie.radius > 1 ? options.series.pie.radius : maxRadius * options.series.pie.radius;

			for (var i = 0; i < slices.length; ++i) 

			{

				var s = slices[i];	

				if(s.pie.show)

				{

					ctx.save();

					ctx.beginPath();

					ctx.moveTo(0,0); // Center of the pie

					//ctx.scale(1, options.series.pie.tilt);	// this actually seems to break everything when here.

					ctx.arc(0,0,radius,s.startAngle,s.startAngle+s.angle,false);

					ctx.closePath();

					x = mouseX-centerLeft;

					y = mouseY-centerTop;

					if(ctx.isPointInPath)

					{

						if (ctx.isPointInPath(mouseX-centerLeft, mouseY-centerTop))

						{

							//alert('found slice!');

							ctx.restore();

							return {datapoint: [s.percent, s.data], dataIndex: 0, series: s, seriesIndex: i};

						}

					}

					else

					{

						// excanvas for IE doesn;t support isPointInPath, this is a workaround. 

						p1X = (radius * Math.cos(s.startAngle));

						p1Y = (radius * Math.sin(s.startAngle));

						p2X = (radius * Math.cos(s.startAngle+(s.angle/4)));

						p2Y = (radius * Math.sin(s.startAngle+(s.angle/4)));

						p3X = (radius * Math.cos(s.startAngle+(s.angle/2)));

						p3Y = (radius * Math.sin(s.startAngle+(s.angle/2)));

						p4X = (radius * Math.cos(s.startAngle+(s.angle/1.5)));

						p4Y = (radius * Math.sin(s.startAngle+(s.angle/1.5)));

						p5X = (radius * Math.cos(s.startAngle+s.angle));

						p5Y = (radius * Math.sin(s.startAngle+s.angle));

						arrPoly = [[0,0],[p1X,p1Y],[p2X,p2Y],[p3X,p3Y],[p4X,p4Y],[p5X,p5Y]];

						arrPoint = [x,y];

						// TODO: perhaps do some mathmatical trickery here with the Y-coordinate to compensate for pie tilt?

						if(isPointInPoly(arrPoly, arrPoint))

						{

							ctx.restore();

							return {datapoint: [s.percent, s.data], dataIndex: 0, series: s, seriesIndex: i};

						}			

					}

					ctx.restore();

				}

			}

			return null;

		}

		function onMouseMove(e) 

		{

			triggerClickHoverEvent('plothover', e);

		}

        function onClick(e) 

		{

			triggerClickHoverEvent('plotclick', e);

        }

		// trigger click or hover event (they send the same parameters so we share their code)

		function triggerClickHoverEvent(eventname, e) 

		{

			var offset = plot.offset(),

				canvasX = parseInt(e.pageX - offset.left),

				canvasY =  parseInt(e.pageY - offset.top),

				item = findNearbySlice(canvasX, canvasY);

			if (options.grid.autoHighlight) 

			{

				// clear auto-highlights

				for (var i = 0; i < highlights.length; ++i) 

				{

					var h = highlights[i];

					if (h.auto == eventname && !(item && h.series == item.series))

						unhighlight(h.series);

				}

			}

			// highlight the slice

			if (item) 

			    highlight(item.series, eventname);

			// trigger any hover bind events

			var pos = { pageX: e.pageX, pageY: e.pageY };

			target.trigger(eventname, [ pos, item ]);	

		}

		function highlight(s, auto) 

		{

			if (typeof s == "number")

				s = series[s];

			var i = indexOfHighlight(s);

			if (i == -1) 

			{

				highlights.push({ series: s, auto: auto });

				plot.triggerRedrawOverlay();

			}

			else if (!auto)

				highlights[i].auto = false;

		}

		function unhighlight(s) 

		{

			if (s == null) 

			{

				highlights = [];

				plot.triggerRedrawOverlay();

			}

			if (typeof s == "number")

				s = series[s];

			var i = indexOfHighlight(s);

			if (i != -1) 

			{

				highlights.splice(i, 1);

				plot.triggerRedrawOverlay();

			}

		}

		function indexOfHighlight(s) 

		{

			for (var i = 0; i < highlights.length; ++i) 

			{

				var h = highlights[i];

				if (h.series == s)

					return i;

			}

			return -1;

		}

		function drawOverlay(plot, octx) 

		{

			//alert(options.series.pie.radius);

			var options = plot.getOptions();

			//alert(options.series.pie.radius);

			var radius = options.series.pie.radius > 1 ? options.series.pie.radius : maxRadius * options.series.pie.radius;

			octx.save();

			octx.translate(centerLeft, centerTop);

			octx.scale(1, options.series.pie.tilt);

			for (i = 0; i < highlights.length; ++i) 

				drawHighlight(highlights[i].series);

			drawDonutHole(octx);

			octx.restore();

			function drawHighlight(series) 

			{

				if (series.angle < 0) return;

				//octx.fillStyle = parseColor(options.series.pie.highlight.color).scale(null, null, null, options.series.pie.highlight.opacity).toString();

				octx.fillStyle = "rgba(255, 255, 255, "+options.series.pie.highlight.opacity+")"; // this is temporary until we have access to parseColor

				octx.beginPath();

				if (Math.abs(series.angle - Math.PI*2) > 0.000000001)

					octx.moveTo(0,0); // Center of the pie

				octx.arc(0,0,radius,series.startAngle,series.startAngle+series.angle,false);

				octx.closePath();

				octx.fill();

			}

		}	

	} // end init (plugin body)

	// define pie specific options and their default values

	var options = {

		series: {

			pie: {

				show: false,

				radius: 'auto',	// actual radius of the visible pie (based on full calculated radius if <=1, or hard pixel value)

				innerRadius:0, /* for donut */

				startAngle: 3/2,

				tilt: 1,

				offset: {

					top: 0,

					left: 'auto'

				},

				stroke: {

					color: '#FFF',

					width: 1

				},

				label: {

					show: 'auto',

					formatter: function(label, slice){

						return '<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);