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d3.ay-pie-chart.js
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d3.ay-pie-chart.js
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/**
* Pie Chart v0.1.0
* https://github.com/gajus/pie-chart
*
* Licensed under the BSD.
* https://github.com/gajus/pie-chart/blob/master/LICENSE
*
* Author: Gajus Kuizinas <g.kuizinas@anuary.com>
*/
define([], function(){
return function (svg, data, options) {
'use strict';
if (window.d3 === undefined) {
throw 'Pie Chart requires presence of the d3.js library.';
}
if (typeof svg === "string") {
svg = d3.select('svg.'+name);
}
var chart_width = svg[0][0].clientWidth || svg[0][0].parentNode.clientWidth,
chart_height = svg[0][0].clientHeight || svg[0][0].parentNode.clientHeight,
chart_size = d3.min([chart_width, chart_height]),
colorScale = d3.scale.category20().domain([0, data.length]),
settings = {
radius_inner: 0,
radius_outer: chart_size / 3,
radius_label: chart_size / 3 + 20,
percentage: true,
value: false,
label_margin: 10,
group_data: 0,
name: function(d){ return d.name; },
value: function(d){ return d.value; },
color: function(d,i){ return colorScale(i); }
},
donut,
arc,
slices,
labels_group,
grouped_labels = {left: [], right: []},
labels,
label_boxes,
label_texts,
parameter,
reposition_colliding_labels = function (group) {
group
.sort(function (a, b) {
return (a.y + a.height) - (b.y + b.height);
})
.forEach(function (e, i) {
if (group[i + 1]) {
if (group[i + 1].y - (e.y + e.height) < settings.label_margin) {
group[i + 1].y = (e.y + e.height) + settings.label_margin;
}
}
if (e.x < settings.label_margin) {
e.x = settings.label_margin;
} else if (e.x + e.width > chart_size - settings.label_margin) {
e.x = chart_size - e.width - settings.label_margin;
}
d3.select(labels[0][e.index])
.attr('transform', 'translate(' + e.x + ', ' + e.y + ')');
d3.select(label_boxes[0][e.index])
.attr('x', 0)
.attr('y', -e.height + 2)
.attr('width', e.width + 4)
.attr('height', e.height + 4);
e.textNode
.attr('x', 2)
.attr('y', 2);
});
},
group_data = function (data) {
var data_size = 0,
removed_data_size = 0,
i;
data.forEach(function (e) {
data_size += settings.value(e);
});
// Check if it is worth grouping the data.
for (i = data.length-1; i >= 0; i--) {
if ((settings.value(data[i]) / data_size) * 100 < settings.group_data) {
removed_data_size++;
}
}
if(removed_data_size > 1) {
removed_data_size = 0;
for (i = data.length-1; i >= 0; i--) {
if ((settings.value(data[i]) / data_size) * 100 < settings.group_data) {
removed_data_size += settings.value(data.splice(i, 1)[0]);
}
}
}
data.push({index: 0, name: 'Other', value: removed_data_size});
return data;
};
if (data.map(function (d) { return d.index; }).indexOf(0) !== -1) {
throw '0 index is reserved for grouped data.'
}
if (options !== undefined) {
for (parameter in options) {
if (options.hasOwnProperty(parameter) && settings[parameter] !== undefined) {
settings[parameter] = options[parameter];
}
}
}
if (settings.group_data) {
data = group_data(data);
}
donut = svg
.append('g')
.attr('class', 'donut')
.attr('transform', 'translate(' + (chart_size / 2) + ', ' + (chart_size / 2) + ')');
arc = d3.svg.arc()
.innerRadius(settings.radius_inner)
.outerRadius(settings.radius_outer);
data = d3.layout.pie()
.value(settings.value)
.sort(function (a, b) {
return b.index - a.index;
})(data);
slices = donut
.selectAll('path')
.data(data)
.enter()
.append('path')
.style('fill', function(d,i){ return settings.color(d.data, i); })
.attr('d', arc)
.on('mouseover', function (d, i) {
d3.select(labels[0][i])
.classed('active', true);
})
.on('mouseout', function (d, i) {
d3.select(labels[0][i])
.classed('active', false);
});
labels_group = svg
.append('g')
.attr('class', 'labels');
labels = labels_group
.selectAll('g.label')
.data(data)
.enter()
.append('g')
.filter(function (e) {
if (settings.percentage) {
return true;
}
return settings.name(e.data) !== undefined;
})
.attr('class', 'label');
label_boxes = labels
.append('rect');
label_texts = labels
.append('text').text(function (e) {
var percentage = (((e.endAngle - e.startAngle) / (2 * Math.PI)) * 100).toFixed(2),
label = [],
name = settings.name(e.data);
if (name !== undefined) {
label.push(name);
}
if (settings.value) {
label.push(' - ' + e.data.value);
}
if (settings.percentage) {
label.push(' (' +percentage + '%)');
}
return label.join(' ');
})
.each(function (d, i) {
var center = arc.centroid(d),
x = center[0],
y = center[1],
h = Math.sqrt(x * x + y * y),
lx = x / h * settings.radius_label + chart_size / 2,
ly = y / h * settings.radius_label + chart_size / 2,
left_aligned = (d.endAngle - d.startAngle) * 0.5 + d.startAngle > Math.PI,
text = d3.select(this),
bb;
// Firefox throws an exception on getBBox if SVG element is not visible
try {
bb = this.getBBox();
} catch (e) {
bb = {width: 0, height: 0}
}
grouped_labels[left_aligned ? 'left' : 'right'].push({
index: i,
width: bb.width,
height: bb.height,
x: left_aligned ? lx - bb.width : lx,
y: ly,
textNode: text
});
});
reposition_colliding_labels(grouped_labels.left);
reposition_colliding_labels(grouped_labels.right);
return svg;
};
});