"use strict";
module.exports = function(Chart) {
var helpers = Chart.helpers,
defaults = Chart.defaults;
defaults.doughnut = {
animation: {
//Boolean - Whether we animate the rotation of the Doughnut
animateRotate: true,
//Boolean - Whether we animate scaling the Doughnut from the centre
animateScale: false
},
aspectRatio: 1,
hover: {
mode: 'single'
},
legendCallback: function(chart) {
var text = [];
text.push('<ul class="' + chart.id + '-legend">');
var data = chart.data;
var datasets = data.datasets;
var labels = data.labels;
if (datasets.length) {
for (var i = 0; i < datasets[0].data.length; ++i) {
text.push('<li><span style="background-color:' + datasets[0].backgroundColor[i] + '"></span>');
if (labels[i]) {
text.push(labels[i]);
}
text.push('</li>');
}
}
text.push('</ul>');
return text.join("");
},
legend: {
labels: {
generateLabels: function(chart) {
var data = chart.data;
if (data.labels.length && data.datasets.length) {
return data.labels.map(function(label, i) {
var meta = chart.getDatasetMeta(0);
var ds = data.datasets[0];
var arc = meta.data[i];
var custom = arc.custom || {};
var getValueAtIndexOrDefault = helpers.getValueAtIndexOrDefault;
var arcOpts = chart.options.elements.arc;
var fill = custom.backgroundColor ? custom.backgroundColor : getValueAtIndexOrDefault(ds.backgroundColor, i, arcOpts.backgroundColor);
var stroke = custom.borderColor ? custom.borderColor : getValueAtIndexOrDefault(ds.borderColor, i, arcOpts.borderColor);
var bw = custom.borderWidth ? custom.borderWidth : getValueAtIndexOrDefault(ds.borderWidth, i, arcOpts.borderWidth);
return {
text: label,
fillStyle: fill,
strokeStyle: stroke,
lineWidth: bw,
hidden: isNaN(ds.data[i]) || meta.data[i].hidden,
// Extra data used for toggling the correct item
index: i
};
});
} else {
return [];
}
}
},
onClick: function(e, legendItem) {
var index = legendItem.index;
var chart = this.chart;
var i, ilen, meta;
for (i = 0, ilen = (chart.data.datasets || []).length; i < ilen; ++i) {
meta = chart.getDatasetMeta(i);
meta.data[index].hidden = !meta.data[index].hidden;
}
chart.update();
}
},
//The percentage of the chart that we cut out of the middle.
cutoutPercentage: 50,
//The rotation of the chart, where the first data arc begins.
rotation: Math.PI * -0.5,
//The total circumference of the chart.
circumference: Math.PI * 2.0,
// Need to override these to give a nice default
tooltips: {
callbacks: {
title: function() {
return '';
},
label: function(tooltipItem, data) {
return data.labels[tooltipItem.index] + ': ' + data.datasets[tooltipItem.datasetIndex].data[tooltipItem.index];
}
}
}
};
defaults.pie = helpers.clone(defaults.doughnut);
helpers.extend(defaults.pie, {
cutoutPercentage: 0
});
Chart.controllers.doughnut = Chart.controllers.pie = Chart.DatasetController.extend({
dataElementType: Chart.elements.Arc,
linkScales: helpers.noop,
// Get index of the dataset in relation to the visible datasets. This allows determining the inner and outer radius correctly
getRingIndex: function getRingIndex(datasetIndex) {
var ringIndex = 0;
for (var j = 0; j < datasetIndex; ++j) {
if (this.chart.isDatasetVisible(j)) {
++ringIndex;
}
}
return ringIndex;
},
update: function update(reset) {
var _this = this;
var chart = _this.chart,
chartArea = chart.chartArea,
opts = chart.options,
arcOpts = opts.elements.arc,
availableWidth = chartArea.right - chartArea.left - arcOpts.borderWidth,
availableHeight = chartArea.bottom - chartArea.top - arcOpts.borderWidth,
minSize = Math.min(availableWidth, availableHeight),
offset = {
x: 0,
y: 0
},
meta = _this.getMeta(),
cutoutPercentage = opts.cutoutPercentage,
circumference = opts.circumference;
// If the chart's circumference isn't a full circle, calculate minSize as a ratio of the width/height of the arc
if (circumference < Math.PI * 2.0) {
var startAngle = opts.rotation % (Math.PI * 2.0);
startAngle += Math.PI * 2.0 * (startAngle >= Math.PI ? -1 : startAngle < -Math.PI ? 1 : 0);
var endAngle = startAngle + circumference;
var start = {x: Math.cos(startAngle), y: Math.sin(startAngle)};
var end = {x: Math.cos(endAngle), y: Math.sin(endAngle)};
var contains0 = (startAngle <= 0 && 0 <= endAngle) || (startAngle <= Math.PI * 2.0 && Math.PI * 2.0 <= endAngle);
var contains90 = (startAngle <= Math.PI * 0.5 && Math.PI * 0.5 <= endAngle) || (startAngle <= Math.PI * 2.5 && Math.PI * 2.5 <= endAngle);
var contains180 = (startAngle <= -Math.PI && -Math.PI <= endAngle) || (startAngle <= Math.PI && Math.PI <= endAngle);
var contains270 = (startAngle <= -Math.PI * 0.5 && -Math.PI * 0.5 <= endAngle) || (startAngle <= Math.PI * 1.5 && Math.PI * 1.5 <= endAngle);
var cutout = cutoutPercentage / 100.0;
var min = {x: contains180 ? -1 : Math.min(start.x * (start.x < 0 ? 1 : cutout), end.x * (end.x < 0 ? 1 : cutout)), y: contains270 ? -1 : Math.min(start.y * (start.y < 0 ? 1 : cutout), end.y * (end.y < 0 ? 1 : cutout))};
var max = {x: contains0 ? 1 : Math.max(start.x * (start.x > 0 ? 1 : cutout), end.x * (end.x > 0 ? 1 : cutout)), y: contains90 ? 1 : Math.max(start.y * (start.y > 0 ? 1 : cutout), end.y * (end.y > 0 ? 1 : cutout))};
var size = {width: (max.x - min.x) * 0.5, height: (max.y - min.y) * 0.5};
minSize = Math.min(availableWidth / size.width, availableHeight / size.height);
offset = {x: (max.x + min.x) * -0.5, y: (max.y + min.y) * -0.5};
}
chart.outerRadius = Math.max(minSize / 2, 0);
chart.innerRadius = Math.max(cutoutPercentage ? (chart.outerRadius / 100) * (cutoutPercentage) : 1, 0);
chart.radiusLength = (chart.outerRadius - chart.innerRadius) / chart.getVisibleDatasetCount();
chart.offsetX = offset.x * chart.outerRadius;
chart.offsetY = offset.y * chart.outerRadius;
meta.total = _this.calculateTotal();
_this.outerRadius = chart.outerRadius - (chart.radiusLength * _this.getRingIndex(_this.index));
_this.innerRadius = _this.outerRadius - chart.radiusLength;
helpers.each(meta.data, function(arc, index) {
_this.updateElement(arc, index, reset);
});
},
updateElement: function(arc, index, reset) {
var _this = this;
var chart = _this.chart,
chartArea = chart.chartArea,
opts = chart.options,
animationOpts = opts.animation,
arcOpts = opts.elements.arc,
centerX = (chartArea.left + chartArea.right) / 2,
centerY = (chartArea.top + chartArea.bottom) / 2,
startAngle = opts.rotation, // non reset case handled later
endAngle = opts.rotation, // non reset case handled later
dataset = _this.getDataset(),
circumference = reset && animationOpts.animateRotate ? 0 : arc.hidden ? 0 : _this.calculateCircumference(dataset.data[index]) * (opts.circumference / (2.0 * Math.PI)),
innerRadius = reset && animationOpts.animateScale ? 0 : _this.innerRadius,
outerRadius = reset && animationOpts.animateScale ? 0 : _this.outerRadius,
custom = arc.custom || {},
valueAtIndexOrDefault = helpers.getValueAtIndexOrDefault;
helpers.extend(arc, {
// Utility
_datasetIndex: _this.index,
_index: index,
// Desired view properties
_model: {
x: centerX + chart.offsetX,
y: centerY + chart.offsetY,
startAngle: startAngle,
endAngle: endAngle,
circumference: circumference,
outerRadius: outerRadius,
innerRadius: innerRadius,
label: valueAtIndexOrDefault(dataset.label, index, chart.data.labels[index])
}
});
var model = arc._model;
model.backgroundColor = custom.backgroundColor ? custom.backgroundColor : valueAtIndexOrDefault(dataset.backgroundColor, index, arcOpts.backgroundColor);
model.hoverBackgroundColor = custom.hoverBackgroundColor ? custom.hoverBackgroundColor : valueAtIndexOrDefault(dataset.hoverBackgroundColor, index, arcOpts.hoverBackgroundColor);
model.borderWidth = custom.borderWidth ? custom.borderWidth : valueAtIndexOrDefault(dataset.borderWidth, index, arcOpts.borderWidth);
model.borderColor = custom.borderColor ? custom.borderColor : valueAtIndexOrDefault(dataset.borderColor, index, arcOpts.borderColor);
// Set correct angles if not resetting
if (!reset || !animationOpts.animateRotate) {
if (index === 0) {
model.startAngle = opts.rotation;
} else {
model.startAngle = _this.getMeta().data[index - 1]._model.endAngle;
}
model.endAngle = model.startAngle + model.circumference;
}
arc.pivot();
},
removeHoverStyle: function(arc) {
Chart.DatasetController.prototype.removeHoverStyle.call(this, arc, this.chart.options.elements.arc);
},
calculateTotal: function() {
var dataset = this.getDataset();
var meta = this.getMeta();
var total = 0;
var value;
helpers.each(meta.data, function(element, index) {
value = dataset.data[index];
if (!isNaN(value) && !element.hidden) {
total += Math.abs(value);
}
});
return total;
},
calculateCircumference: function(value) {
var total = this.getMeta().total;
if (total > 0 && !isNaN(value)) {
return (Math.PI * 2.0) * (value / total);
} else {
return 0;
}
}
});
};
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