Current File : //www/varak.net/awstats.varak.net/js/jquery.flot.pie.js
/*
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
Available options are:
series: {
pie: {
show: true/false
radius: 0-1 for percentage of fullsize, or a specified pixel length, or 'auto'
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
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
}
}
}
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;
// add hook to determine if pie plugin in enabled, and then perform necessary operations
plot.hooks.processOptions.push(checkPieEnabled);
// 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;
// add processData hook to do transformations on the data
plot.hooks.processDatapoints.push(processDatapoints);
// add draw hook
plot.hooks.draw.push(draw);
}
}
// debugging function that prints out an object
function alertObject(obj)
{
var msg = '';
function traverse(obj, depth)
{
if (!depth)
depth = 0;
for (var i in obj)
{
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 in data)
{
var item = parseFloat(data[i].data);
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) / 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;
else
centerLeft -= legendWidth;
else
centerLeft += options.series.pie.offset.left;
if (centerLeft < maxRadius)
centerLeft = maxRadius;
else if (centerLeft > canvas.width - maxRadius)
centerLeft = canvas.width - maxRadius;
}
function combine(data)
{
calcTotal(data);
var combined = 0;
var color = options.series.pie.combine.color;
var newdata = [];
for (var i in data)
{
// make sure its a number
data[i].data = parseFloat(data[i].data);
if (!data[i].data)
data[i].data = 0;
if (data[i].data / total <= options.series.pie.combine.threshold)
{
combined += data[i].data;
if (!color)
color = data[i].color;
}
else
{
newdata.push({
data: data[i].data,
color: data[i].color,
label: data[i].label,
angle: (data[i].data * (Math.PI * 2)) / total,
percent: (data[i].data / total * 100)
});
}
}
if (combined > 0)
newdata.push({
data: combined,
color: color,
label: options.series.pie.combine.label,
angle: (combined * (Math.PI * 2)) / total,
percent: (combined / total * 100)
});
return newdata;
}
function draw(plot, ctx)
{
setupPie();
var slices = plot.getData();
var attempts = 0;
while (redraw && attempts < redrawAttempts)
{
redraw = false;
if (attempts > 0)
maxRadius *= shrink;
attempts += 1;
clear();
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 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.rotate(startAngle); // start at top; -- This doesn't work properly in Opera
// draw slices
ctx.save();
var currentAngle = startAngle;
for (var i in slices)
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 in slices)
drawSlice(slices[i].angle, options.series.pie.stroke.color, false);
ctx.restore();
// draw labels
if (options.series.pie.label.show)
drawLabels();
// restore to original state
ctx.restore();
function drawSlice(angle, color, fill)
{
if (fill)
ctx.fillStyle = color;
else
ctx.strokeStyle = color;
ctx.beginPath();
if (angle != Math.PI * 2)
ctx.moveTo(0, 0); // Center of the pie
//ctx.arc(0,0,radius,0,angle,false); // This doesn't work properly in Opera
ctx.arc(0, 0, radius, currentAngle, currentAngle + angle, 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 in slices)
{
if (slices[i].percent >= options.series.pie.label.threshold * 100)
drawLabel(slices[i], currentAngle, i);
currentAngle += slices[i].angle;
}
function drawLabel(slice, startAngle, index)
{
// 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);
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
} // 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)
startAngle: 3 / 2,
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: 0, // 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
}
}
}
};
$.plot.plugins.push({
init: init,
options: options,
name: "pie",
version: "0.3.1"
});
})(jQuery);
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