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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 valueOrDefault = helpers.valueOrDefault;
var resolve = helpers.options.resolve;
defaults._set('radar', {
scale: {
type: 'radialLinear'
},
elements: {
line: {
tension: 0 // no bezier in radar
}
}
});
module.exports = DatasetController.extend({
datasetElementType: elements.Line,
dataElementType: elements.Point,
linkScales: helpers.noop,
update: function(reset) {
var me = this;
var meta = me.getMeta();
var line = meta.dataset;
var points = meta.data || [];
var scale = me.chart.scale;
var dataset = me.getDataset();
var i, ilen;
// Compatibility: If the properties are defined with only the old name, use those values
if ((dataset.tension !== undefined) && (dataset.lineTension === undefined)) {
dataset.lineTension = dataset.tension;
}
// Utility
line._scale = scale;
line._datasetIndex = me.index;
// Data
line._children = points;
line._loop = true;
// Model
line._model = me._resolveLineOptions(line);
line.pivot();
// Update Points
for (i = 0, ilen = points.length; i < ilen; ++i) {
me.updateElement(points[i], i, reset);
}
// Update bezier control points
me.updateBezierControlPoints();
// Now pivot the point for animation
for (i = 0, ilen = points.length; i < ilen; ++i) {
points[i].pivot();
}
},
updateElement: function(point, index, reset) {
var me = this;
var custom = point.custom || {};
var dataset = me.getDataset();
var scale = me.chart.scale;
var pointPosition = scale.getPointPositionForValue(index, dataset.data[index]);
var options = me._resolvePointOptions(point, index);
var lineModel = me.getMeta().dataset._model;
var x = reset ? scale.xCenter : pointPosition.x;
var y = reset ? scale.yCenter : pointPosition.y;
// Utility
point._scale = scale;
point._options = options;
point._datasetIndex = me.index;
point._index = index;
// Desired view properties
point._model = {
x: x, // value not used in dataset scale, but we want a consistent API between scales
y: y,
skip: custom.skip || isNaN(x) || isNaN(y),
// Appearance
radius: options.radius,
pointStyle: options.pointStyle,
rotation: options.rotation,
backgroundColor: options.backgroundColor,
borderColor: options.borderColor,
borderWidth: options.borderWidth,
tension: valueOrDefault(custom.tension, lineModel ? lineModel.tension : 0),
// Tooltip
hitRadius: options.hitRadius
};
},
/**
* @private
*/
_resolvePointOptions: function(element, index) {
var me = this;
var chart = me.chart;
var dataset = chart.data.datasets[me.index];
var custom = element.custom || {};
var options = chart.options.elements.point;
var values = {};
var i, ilen, key;
// Scriptable options
var context = {
chart: chart,
dataIndex: index,
dataset: dataset,
datasetIndex: me.index
};
var ELEMENT_OPTIONS = {
backgroundColor: 'pointBackgroundColor',
borderColor: 'pointBorderColor',
borderWidth: 'pointBorderWidth',
hitRadius: 'pointHitRadius',
hoverBackgroundColor: 'pointHoverBackgroundColor',
hoverBorderColor: 'pointHoverBorderColor',
hoverBorderWidth: 'pointHoverBorderWidth',
hoverRadius: 'pointHoverRadius',
pointStyle: 'pointStyle',
radius: 'pointRadius',
rotation: 'pointRotation'
};
var keys = Object.keys(ELEMENT_OPTIONS);
for (i = 0, ilen = keys.length; i < ilen; ++i) {
key = keys[i];
values[key] = resolve([
custom[key],
dataset[ELEMENT_OPTIONS[key]],
dataset[key],
options[key]
], context, index);
}
return values;
},
/**
* @private
*/
_resolveLineOptions: function(element) {
var me = this;
var chart = me.chart;
var dataset = chart.data.datasets[me.index];
var custom = element.custom || {};
var options = chart.options.elements.line;
var values = {};
var i, ilen, key;
var keys = [
'backgroundColor',
'borderWidth',
'borderColor',
'borderCapStyle',
'borderDash',
'borderDashOffset',
'borderJoinStyle',
'fill'
];
for (i = 0, ilen = keys.length; i < ilen; ++i) {
key = keys[i];
values[key] = resolve([
custom[key],
dataset[key],
options[key]
]);
}
values.tension = valueOrDefault(dataset.lineTension, options.tension);
return values;
},
updateBezierControlPoints: function() {
var me = this;
var meta = me.getMeta();
var area = me.chart.chartArea;
var points = meta.data || [];
var i, ilen, model, controlPoints;
function capControlPoint(pt, min, max) {
return Math.max(Math.min(pt, max), min);
}
for (i = 0, ilen = points.length; i < ilen; ++i) {
model = points[i]._model;
controlPoints = helpers.splineCurve(
helpers.previousItem(points, i, true)._model,
model,
helpers.nextItem(points, i, true)._model,
model.tension
);
// Prevent the bezier going outside of the bounds of the graph
model.controlPointPreviousX = capControlPoint(controlPoints.previous.x, area.left, area.right);
model.controlPointPreviousY = capControlPoint(controlPoints.previous.y, area.top, area.bottom);
model.controlPointNextX = capControlPoint(controlPoints.next.x, area.left, area.right);
model.controlPointNextY = capControlPoint(controlPoints.next.y, area.top, area.bottom);
}
},
setHoverStyle: function(point) {
var model = point._model;
var options = point._options;
var getHoverColor = helpers.getHoverColor;
point.$previousStyle = {
backgroundColor: model.backgroundColor,
borderColor: model.borderColor,
borderWidth: model.borderWidth,
radius: model.radius
};
model.backgroundColor = valueOrDefault(options.hoverBackgroundColor, getHoverColor(options.backgroundColor));
model.borderColor = valueOrDefault(options.hoverBorderColor, getHoverColor(options.borderColor));
model.borderWidth = valueOrDefault(options.hoverBorderWidth, options.borderWidth);
model.radius = valueOrDefault(options.hoverRadius, options.radius);
}
});