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'use strict';
var DatasetController = require('../core/core.datasetController');
var defaults = require('../core/core.defaults');
var elements = require('../elements/index');
var helpers = require('../helpers/index');
var resolve = helpers.options.resolve;
defaults._set('polarArea', {
scale: {
type: 'radialLinear',
angleLines: {
display: false
},
gridLines: {
circular: true
},
pointLabels: {
display: false
},
ticks: {
beginAtZero: true
}
},
// Boolean - Whether to animate the rotation of the chart
animation: {
animateRotate: true,
animateScale: true
},
startAngle: -0.5 * Math.PI,
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 arcOpts = chart.options.elements.arc;
var fill = resolve([custom.backgroundColor, ds.backgroundColor, arcOpts.backgroundColor], undefined, i);
var stroke = resolve([custom.borderColor, ds.borderColor, arcOpts.borderColor], undefined, i);
var bw = resolve([custom.borderWidth, ds.borderWidth, arcOpts.borderWidth], undefined, i);
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
};
});
}
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();
}
},
// Need to override these to give a nice default
tooltips: {
callbacks: {
title: function() {
return '';
},
label: function(item, data) {
return data.labels[item.index] + ': ' + item.yLabel;
}
}
}
});
module.exports = DatasetController.extend({
dataElementType: elements.Arc,
linkScales: helpers.noop,
update: function(reset) {
var me = this;
var dataset = me.getDataset();
var meta = me.getMeta();
var start = me.chart.options.startAngle || 0;
var starts = me._starts = [];
var angles = me._angles = [];
var arcs = meta.data;
var i, ilen, angle;
me._updateRadius();
meta.count = me.countVisibleElements();
for (i = 0, ilen = dataset.data.length; i < ilen; i++) {
starts[i] = start;
angle = me._computeAngle(i);
angles[i] = angle;
start += angle;
}
for (i = 0, ilen = arcs.length; i < ilen; ++i) {
arcs[i]._options = me._resolveElementOptions(arcs[i], i);
me.updateElement(arcs[i], i, reset);
}
},
/**
* @private
*/
_updateRadius: function() {
var me = this;
var chart = me.chart;
var chartArea = chart.chartArea;
var opts = chart.options;
var minSize = Math.min(chartArea.right - chartArea.left, chartArea.bottom - chartArea.top);
chart.outerRadius = Math.max(minSize / 2, 0);
chart.innerRadius = Math.max(opts.cutoutPercentage ? (chart.outerRadius / 100) * (opts.cutoutPercentage) : 1, 0);
chart.radiusLength = (chart.outerRadius - chart.innerRadius) / chart.getVisibleDatasetCount();
me.outerRadius = chart.outerRadius - (chart.radiusLength * me.index);
me.innerRadius = me.outerRadius - chart.radiusLength;
},
updateElement: function(arc, index, reset) {
var me = this;
var chart = me.chart;
var dataset = me.getDataset();
var opts = chart.options;
var animationOpts = opts.animation;
var scale = chart.scale;
var labels = chart.data.labels;
var centerX = scale.xCenter;
var centerY = scale.yCenter;
// var negHalfPI = -0.5 * Math.PI;
var datasetStartAngle = opts.startAngle;
var distance = arc.hidden ? 0 : scale.getDistanceFromCenterForValue(dataset.data[index]);
var startAngle = me._starts[index];
var endAngle = startAngle + (arc.hidden ? 0 : me._angles[index]);
var resetRadius = animationOpts.animateScale ? 0 : scale.getDistanceFromCenterForValue(dataset.data[index]);
var options = arc._options || {};
helpers.extend(arc, {
// Utility
_datasetIndex: me.index,
_index: index,
_scale: scale,
// Desired view properties
_model: {
backgroundColor: options.backgroundColor,
borderColor: options.borderColor,
borderWidth: options.borderWidth,
borderAlign: options.borderAlign,
x: centerX,
y: centerY,
innerRadius: 0,
outerRadius: reset ? resetRadius : distance,
startAngle: reset && animationOpts.animateRotate ? datasetStartAngle : startAngle,
endAngle: reset && animationOpts.animateRotate ? datasetStartAngle : endAngle,
label: helpers.valueAtIndexOrDefault(labels, index, labels[index])
}
});
arc.pivot();
},
countVisibleElements: function() {
var dataset = this.getDataset();
var meta = this.getMeta();
var count = 0;
helpers.each(meta.data, function(element, index) {
if (!isNaN(dataset.data[index]) && !element.hidden) {
count++;
}
});
return count;
},
/**
* @protected
*/
setHoverStyle: function(arc) {
var model = arc._model;
var options = arc._options;
var getHoverColor = helpers.getHoverColor;
var valueOrDefault = helpers.valueOrDefault;
arc.$previousStyle = {
backgroundColor: model.backgroundColor,
borderColor: model.borderColor,
borderWidth: model.borderWidth,
};
model.backgroundColor = valueOrDefault(options.hoverBackgroundColor, getHoverColor(options.backgroundColor));
model.borderColor = valueOrDefault(options.hoverBorderColor, getHoverColor(options.borderColor));
model.borderWidth = valueOrDefault(options.hoverBorderWidth, options.borderWidth);
},
/**
* @private
*/
_resolveElementOptions: function(arc, index) {
var me = this;
var chart = me.chart;
var dataset = me.getDataset();
var custom = arc.custom || {};
var options = chart.options.elements.arc;
var values = {};
var i, ilen, key;
// Scriptable options
var context = {
chart: chart,
dataIndex: index,
dataset: dataset,
datasetIndex: me.index
};
var keys = [
'backgroundColor',
'borderColor',
'borderWidth',
'borderAlign',
'hoverBackgroundColor',
'hoverBorderColor',
'hoverBorderWidth',
];
for (i = 0, ilen = keys.length; i < ilen; ++i) {
key = keys[i];
values[key] = resolve([
custom[key],
dataset[key],
options[key]
], context, index);
}
return values;
},
/**
* @private
*/
_computeAngle: function(index) {
var me = this;
var count = this.getMeta().count;
var dataset = me.getDataset();
var meta = me.getMeta();
if (isNaN(dataset.data[index]) || meta.data[index].hidden) {
return 0;
}
// Scriptable options
var context = {
chart: me.chart,
dataIndex: index,
dataset: dataset,
datasetIndex: me.index
};
return resolve([
me.chart.options.elements.arc.angle,
(2 * Math.PI) / count
], context, index);
}
});