"use strict";
module.exports = function(Chart) {
var helpers = Chart.helpers;
Chart.defaults.line = {
showLines: true,
hover: {
mode: "label"
},
scales: {
xAxes: [{
type: "category",
id: 'x-axis-0'
}],
yAxes: [{
type: "linear",
id: 'y-axis-0'
}]
}
};
Chart.controllers.line = Chart.DatasetController.extend({
datasetElementType: Chart.elements.Line,
dataElementType: Chart.elements.Point,
addElementAndReset: function(index) {
var me = this;
var options = me.chart.options;
Chart.DatasetController.prototype.addElementAndReset.call(me, index);
// Make sure bezier control points are updated
if (options.showLines && options.elements.line.tension !== 0) {
me.updateBezierControlPoints();
}
},
update: function update(reset) {
var me = this;
var meta = me.getMeta();
var line = meta.dataset;
var points = meta.data || [];
var options = me.chart.options;
var lineElementOptions = options.elements.line;
var scale = me.getScaleForId(meta.yAxisID);
var i, ilen, dataset, custom;
// Update Line
if (options.showLines) {
dataset = me.getDataset();
custom = line.custom || {};
// 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 = {
// Appearance
tension: custom.tension ? custom.tension : helpers.getValueOrDefault(dataset.lineTension, lineElementOptions.tension),
backgroundColor: custom.backgroundColor ? custom.backgroundColor : (dataset.backgroundColor || lineElementOptions.backgroundColor),
borderWidth: custom.borderWidth ? custom.borderWidth : (dataset.borderWidth || lineElementOptions.borderWidth),
borderColor: custom.borderColor ? custom.borderColor : (dataset.borderColor || lineElementOptions.borderColor),
borderCapStyle: custom.borderCapStyle ? custom.borderCapStyle : (dataset.borderCapStyle || lineElementOptions.borderCapStyle),
borderDash: custom.borderDash ? custom.borderDash : (dataset.borderDash || lineElementOptions.borderDash),
borderDashOffset: custom.borderDashOffset ? custom.borderDashOffset : (dataset.borderDashOffset || lineElementOptions.borderDashOffset),
borderJoinStyle: custom.borderJoinStyle ? custom.borderJoinStyle : (dataset.borderJoinStyle || lineElementOptions.borderJoinStyle),
fill: custom.fill ? custom.fill : (dataset.fill !== undefined ? dataset.fill : lineElementOptions.fill),
// Scale
scaleTop: scale.top,
scaleBottom: scale.bottom,
scaleZero: scale.getBasePixel()
};
line.pivot();
}
// Update Points
for (i=0, ilen=points.length; i<ilen; ++i) {
me.updateElement(points[i], i, reset);
}
if (options.showLines && lineElementOptions.tension !== 0) {
me.updateBezierControlPoints();
}
},
getPointBackgroundColor: function(point, index) {
var backgroundColor = this.chart.options.elements.point.backgroundColor;
var dataset = this.getDataset();
var custom = point.custom || {};
if (custom.backgroundColor) {
backgroundColor = custom.backgroundColor;
} else if (dataset.pointBackgroundColor) {
backgroundColor = helpers.getValueAtIndexOrDefault(dataset.pointBackgroundColor, index, backgroundColor);
} else if (dataset.backgroundColor) {
backgroundColor = dataset.backgroundColor;
}
return backgroundColor;
},
getPointBorderColor: function(point, index) {
var borderColor = this.chart.options.elements.point.borderColor;
var dataset = this.getDataset();
var custom = point.custom || {};
if (custom.borderColor) {
borderColor = custom.borderColor;
} else if (dataset.pointBorderColor) {
borderColor = helpers.getValueAtIndexOrDefault(dataset.pointBorderColor, index, borderColor);
} else if (dataset.borderColor) {
borderColor = dataset.borderColor;
}
return borderColor;
},
getPointBorderWidth: function(point, index) {
var borderWidth = this.chart.options.elements.point.borderWidth;
var dataset = this.getDataset();
var custom = point.custom || {};
if (custom.borderWidth) {
borderWidth = custom.borderWidth;
} else if (dataset.pointBorderWidth) {
borderWidth = helpers.getValueAtIndexOrDefault(dataset.pointBorderWidth, index, borderWidth);
} else if (dataset.borderWidth) {
borderWidth = dataset.borderWidth;
}
return borderWidth;
},
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 pointOptions = me.chart.options.elements.point;
var x, y;
// Compatibility: If the properties are defined with only the old name, use those values
if ((dataset.radius !== undefined) && (dataset.pointRadius === undefined)) {
dataset.pointRadius = dataset.radius;
}
if ((dataset.hitRadius !== undefined) && (dataset.pointHitRadius === undefined)) {
dataset.pointHitRadius = dataset.hitRadius;
}
x = xScale.getPixelForValue(value, index, datasetIndex, me.chart.isCombo);
y = reset ? yScale.getBasePixel() : me.calculatePointY(value, index, datasetIndex, me.chart.isCombo);
// Utility
point._xScale = xScale;
point._yScale = yScale;
point._datasetIndex = datasetIndex;
point._index = index;
// Desired view properties
point._model = {
x: x,
y: y,
skip: custom.skip || isNaN(x) || isNaN(y),
// Appearance
radius: custom.radius || helpers.getValueAtIndexOrDefault(dataset.pointRadius, index, pointOptions.radius),
pointStyle: custom.pointStyle || helpers.getValueAtIndexOrDefault(dataset.pointStyle, index, pointOptions.pointStyle),
backgroundColor: me.getPointBackgroundColor(point, index),
borderColor: me.getPointBorderColor(point, index),
borderWidth: me.getPointBorderWidth(point, index),
tension: meta.dataset._model ? meta.dataset._model.tension : 0,
// Tooltip
hitRadius: custom.hitRadius || helpers.getValueAtIndexOrDefault(dataset.pointHitRadius, index, pointOptions.hitRadius)
};
},
calculatePointY: function(value, index, datasetIndex, isCombo) {
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' && chart.isDatasetVisible(i)) {
if (ds.data[index] < 0) {
sumNeg += ds.data[index] || 0;
} else {
sumPos += ds.data[index] || 0;
}
}
}
if (value < 0) {
return yScale.getPixelForValue(sumNeg + value);
} else {
return yScale.getPixelForValue(sumPos + value);
}
}
return yScale.getPixelForValue(value);
},
updateBezierControlPoints: function() {
var meta = this.getMeta();
var area = this.chart.chartArea;
var points = meta.data || [];
var i, ilen, point, model, controlPoints;
for (i=0, ilen=points.length; i<ilen; ++i) {
point = points[i];
model = point._model;
controlPoints = helpers.splineCurve(
helpers.previousItem(points, i)._model,
model,
helpers.nextItem(points, i)._model,
meta.dataset._model.tension
);
// Prevent the bezier going outside of the bounds of the graph
model.controlPointPreviousX = Math.max(Math.min(controlPoints.previous.x, area.right), area.left);
model.controlPointPreviousY = Math.max(Math.min(controlPoints.previous.y, area.bottom), area.top);
model.controlPointNextX = Math.max(Math.min(controlPoints.next.x, area.right), area.left);
model.controlPointNextY = Math.max(Math.min(controlPoints.next.y, area.bottom), area.top);
// Now pivot the point for animation
point.pivot();
}
},
draw: function(ease) {
var meta = this.getMeta();
var points = meta.data || [];
var easingDecimal = ease || 1;
var i, ilen;
// Transition Point Locations
for (i=0, ilen=points.length; i<ilen; ++i) {
points[i].transition(easingDecimal);
}
// Transition and Draw the line
if (this.chart.options.showLines) {
meta.dataset.transition(easingDecimal).draw();
}
// Draw the points
for (i=0, ilen=points.length; i<ilen; ++i) {
points[i].draw();
}
},
setHoverStyle: function(point) {
// Point
var dataset = this.chart.data.datasets[point._datasetIndex];
var index = point._index;
var custom = point.custom || {};
var model = point._model;
model.radius = custom.hoverRadius || helpers.getValueAtIndexOrDefault(dataset.pointHoverRadius, index, this.chart.options.elements.point.hoverRadius);
model.backgroundColor = custom.hoverBackgroundColor || helpers.getValueAtIndexOrDefault(dataset.pointHoverBackgroundColor, index, helpers.getHoverColor(model.backgroundColor));
model.borderColor = custom.hoverBorderColor || helpers.getValueAtIndexOrDefault(dataset.pointHoverBorderColor, index, helpers.getHoverColor(model.borderColor));
model.borderWidth = custom.hoverBorderWidth || helpers.getValueAtIndexOrDefault(dataset.pointHoverBorderWidth, index, model.borderWidth);
},
removeHoverStyle: function(point) {
var me = this;
var dataset = me.chart.data.datasets[point._datasetIndex];
var index = point._index;
var custom = point.custom || {};
var model = point._model;
// Compatibility: If the properties are defined with only the old name, use those values
if ((dataset.radius !== undefined) && (dataset.pointRadius === undefined)) {
dataset.pointRadius = dataset.radius;
}
model.radius = custom.radius || helpers.getValueAtIndexOrDefault(dataset.pointRadius, index, me.chart.options.elements.point.radius);
model.backgroundColor = me.getPointBackgroundColor(point, index);
model.borderColor = me.getPointBorderColor(point, index);
model.borderWidth = me.getPointBorderWidth(point, index);
}
});
};
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