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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;
var isPointInArea = helpers.canvas._isPointInArea;
defaults._set('line', {
showLines: true,
spanGaps: false,
hover: {
mode: 'label'
},
scales: {
xAxes: [{
type: 'category',
id: 'x-axis-0'
}],
yAxes: [{
type: 'linear',
id: 'y-axis-0'
}]
}
});
function lineEnabled(dataset, options) {
return valueOrDefault(dataset.showLine, options.showLines);
}
module.exports = DatasetController.extend({
datasetElementType: elements.Line,
dataElementType: elements.Point,
update: function(reset) {
var me = this;
var meta = me.getMeta();
var line = meta.dataset;
var points = meta.data || [];
var scale = me.getScaleForId(meta.yAxisID);
var dataset = me.getDataset();
var showLine = lineEnabled(dataset, me.chart.options);
var i, ilen;
// Update Line
if (showLine) {
// 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;
// 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);
}
if (showLine && line._model.tension !== 0) {
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 meta = me.getMeta();
var custom = point.custom || {};
var dataset = me.getDataset();
var datasetIndex = me.index;
var value = dataset.data[index];
var yScale = me.getScaleForId(meta.yAxisID);
var xScale = me.getScaleForId(meta.xAxisID);
var lineModel = meta.dataset._model;
var x, y;
var options = me._resolvePointOptions(point, index);
x = xScale.getPixelForValue(typeof value === 'object' ? value : NaN, index, datasetIndex);
y = reset ? yScale.getBasePixel() : me.calculatePointY(value, index, datasetIndex);
// Utility
point._xScale = xScale;
point._yScale = yScale;
point._options = options;
point._datasetIndex = datasetIndex;
point._index = index;
// Desired view properties
point._model = {
x: x,
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),
steppedLine: lineModel ? lineModel.steppedLine : false,
// 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;
var elementOptions = options.elements.line;
var values = {};
var i, ilen, key;
var keys = [
'backgroundColor',
'borderWidth',
'borderColor',
'borderCapStyle',
'borderDash',
'borderDashOffset',
'borderJoinStyle',
'fill',
'cubicInterpolationMode'
];
for (i = 0, ilen = keys.length; i < ilen; ++i) {
key = keys[i];
values[key] = resolve([
custom[key],
dataset[key],
elementOptions[key]
]);
}
// The default behavior of lines is to break at null values, according
// to https://github.com/chartjs/Chart.js/issues/2435#issuecomment-216718158
// This option gives lines the ability to span gaps
values.spanGaps = valueOrDefault(dataset.spanGaps, options.spanGaps);
values.tension = valueOrDefault(dataset.lineTension, elementOptions.tension);
values.steppedLine = resolve([custom.steppedLine, dataset.steppedLine, elementOptions.stepped]);
return values;
},
calculatePointY: function(value, index, datasetIndex) {
var me = this;
var chart = me.chart;
var meta = me.getMeta();
var yScale = me.getScaleForId(meta.yAxisID);
var sumPos = 0;
var sumNeg = 0;
var i, ds, dsMeta;
if (yScale.options.stacked) {
for (i = 0; i < datasetIndex; i++) {
ds = chart.data.datasets[i];
dsMeta = chart.getDatasetMeta(i);
if (dsMeta.type === 'line' && dsMeta.yAxisID === yScale.id && chart.isDatasetVisible(i)) {
var stackedRightValue = Number(yScale.getRightValue(ds.data[index]));
if (stackedRightValue < 0) {
sumNeg += stackedRightValue || 0;
} else {
sumPos += stackedRightValue || 0;
}
}
}
var rightValue = Number(yScale.getRightValue(value));
if (rightValue < 0) {
return yScale.getPixelForValue(sumNeg + rightValue);
}
return yScale.getPixelForValue(sumPos + rightValue);
}
return yScale.getPixelForValue(value);
},
updateBezierControlPoints: function() {
var me = this;
var chart = me.chart;
var meta = me.getMeta();
var lineModel = meta.dataset._model;
var area = chart.chartArea;
var points = meta.data || [];
var i, ilen, model, controlPoints;
// Only consider points that are drawn in case the spanGaps option is used
if (lineModel.spanGaps) {
points = points.filter(function(pt) {
return !pt._model.skip;
});
}
function capControlPoint(pt, min, max) {
return Math.max(Math.min(pt, max), min);
}
if (lineModel.cubicInterpolationMode === 'monotone') {
helpers.splineCurveMonotone(points);
} else {
for (i = 0, ilen = points.length; i < ilen; ++i) {
model = points[i]._model;
controlPoints = helpers.splineCurve(
helpers.previousItem(points, i)._model,
model,
helpers.nextItem(points, i)._model,
lineModel.tension
);
model.controlPointPreviousX = controlPoints.previous.x;
model.controlPointPreviousY = controlPoints.previous.y;
model.controlPointNextX = controlPoints.next.x;
model.controlPointNextY = controlPoints.next.y;
}
}
if (chart.options.elements.line.capBezierPoints) {
for (i = 0, ilen = points.length; i < ilen; ++i) {
model = points[i]._model;
if (isPointInArea(model, area)) {
if (i > 0 && isPointInArea(points[i - 1]._model, area)) {
model.controlPointPreviousX = capControlPoint(model.controlPointPreviousX, area.left, area.right);
model.controlPointPreviousY = capControlPoint(model.controlPointPreviousY, area.top, area.bottom);
}
if (i < points.length - 1 && isPointInArea(points[i + 1]._model, area)) {
model.controlPointNextX = capControlPoint(model.controlPointNextX, area.left, area.right);
model.controlPointNextY = capControlPoint(model.controlPointNextY, area.top, area.bottom);
}
}
}
}
},
draw: function() {
var me = this;
var chart = me.chart;
var meta = me.getMeta();
var points = meta.data || [];
var area = chart.chartArea;
var ilen = points.length;
var halfBorderWidth;
var i = 0;
if (lineEnabled(me.getDataset(), chart.options)) {
halfBorderWidth = (meta.dataset._model.borderWidth || 0) / 2;
helpers.canvas.clipArea(chart.ctx, {
left: area.left,
right: area.right,
top: area.top - halfBorderWidth,
bottom: area.bottom + halfBorderWidth
});
meta.dataset.draw();
helpers.canvas.unclipArea(chart.ctx);
}
// Draw the points
for (; i < ilen; ++i) {
points[i].draw(area);
}
},
/**
* @protected
*/
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);
},
});