// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
/**
* Chart base.
*
* @copyright 2016 Frédéric Massart - FMCorz.net
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
* @module core/chart_base
*/
define(['core/chart_series', 'core/chart_axis'], function(Series, Axis) {
/**
* Chart base.
*
* The constructor of a chart must never take any argument.
*
* {@link module:core/chart_base#_setDefault} to set the defaults on instantiation.
*
* @class
*/
function Base() {
this._series = [];
this._labels = [];
this._xaxes = [];
this._yaxes = [];
this._setDefaults();
}
/**
* The series constituting this chart.
*
* @protected
* @type {module:core/chart_series[]}
*/
Base.prototype._series = null;
/**
* The labels of the X axis when categorised.
*
* @protected
* @type {String[]}
*/
Base.prototype._labels = null;
/**
* Options for chart legend display.
*
* @protected
* @type {Object}
*/
Base.prototype._legendOptions = null;
/**
* The title of the chart.
*
* @protected
* @type {String}
*/
Base.prototype._title = null;
/**
* The X axes.
*
* @protected
* @type {module:core/chart_axis[]}
*/
Base.prototype._xaxes = null;
/**
* The Y axes.
*
* @protected
* @type {module:core/chart_axis[]}
*/
Base.prototype._yaxes = null;
/**
* Colours to pick from when automatically assigning them.
*
* @const
* @type {String[]}
*/
Base.prototype.COLORSET = ['#f3c300', '#875692', '#f38400', '#a1caf1', '#be0032', '#c2b280', '#7f180d', '#008856',
'#e68fac', '#0067a5'];
/**
* Set of colours defined by setting $CFG->chart_colorset to be picked when automatically assigning them.
*
* @type {String[]}
* @protected
*/
Base.prototype._configColorSet = null;
/**
* The type of chart.
*
* @abstract
* @type {String}
* @const
*/
Base.prototype.TYPE = null;
/**
* Add a series to the chart.
*
* This will automatically assign a color to the series if it does not have one.
*
* @param {module:core/chart_series} series The series to add.
*/
Base.prototype.addSeries = function(series) {
this._validateSeries(series);
this._series.push(series);
// Give a default color from the set.
if (series.getColor() === null) {
var configColorSet = this.getConfigColorSet() || Base.prototype.COLORSET;
series.setColor(configColorSet[this._series.length % configColorSet.length]);
}
};
/**
* Create a new instance of a chart from serialised data.
*
* the serialised attributes they offer and support.
*
* @static
* @method create
* @param {module:core/chart_base} Klass The class oject representing the type of chart to instantiate.
* @param {Object} data The data of the chart.
* @return {module:core/chart_base}
*/
Base.prototype.create = function(Klass, data) {
// TODO Not convinced about the usage of Klass here but I can't figure out a way
// to have a reference to the class in the sub classes, in PHP I'd do new self().
var Chart = new Klass();
Chart.setConfigColorSet(data.config_colorset);
Chart.setLabels(data.labels);
Chart.setTitle(data.title);
if (data.legend_options) {
Chart.setLegendOptions(data.legend_options);
}
data.series.forEach(function(seriesData) {
Chart.addSeries(Series.prototype.create(seriesData));
});
data.axes.x.forEach(function(axisData, i) {
Chart.setXAxis(Axis.prototype.create(axisData), i);
});
data.axes.y.forEach(function(axisData, i) {
Chart.setYAxis(Axis.prototype.create(axisData), i);
});
return Chart;
};
/**
* Get an axis.
*
* @private
* @param {String} xy Accepts the values 'x' or 'y'.
* @param {Number} [index=0] The index of the axis of its type.
* @param {Bool} [createIfNotExists=false] When true, create an instance if it does not exist.
* @return {module:core/chart_axis}
*/
Base.prototype.__getAxis = function(xy, index, createIfNotExists) {
var axes = xy === 'x' ? this._xaxes : this._yaxes,
setAxis = (xy === 'x' ? this.setXAxis : this.setYAxis).bind(this),
axis;
index = typeof index === 'undefined' ? 0 : index;
createIfNotExists = typeof createIfNotExists === 'undefined' ? false : createIfNotExists;
axis = axes[index];
if (typeof axis === 'undefined') {
if (!createIfNotExists) {
throw new Error('Unknown axis.');
}
axis = new Axis();
setAxis(axis, index);
}
return axis;
};
/**
* Get colours defined by setting.
*
* @return {String[]}
*/
Base.prototype.getConfigColorSet = function() {
return this._configColorSet;
};
/**
* Get the labels of the X axis.
*
* @return {String[]}
*/
Base.prototype.getLabels = function() {
return this._labels;
};
/**
* Get whether to display the chart legend.
*
* @return {Bool}
*/
Base.prototype.getLegendOptions = function() {
return this._legendOptions;
};
/**
* Get the series.
*
* @return {module:core/chart_series[]}
*/
Base.prototype.getSeries = function() {
return this._series;
};
/**
* Get the title of the chart.
*
* @return {String}
*/
Base.prototype.getTitle = function() {
return this._title;
};
/**
* Get the type of chart.
*
* @see module:core/chart_base#TYPE
* @return {String}
*/
Base.prototype.getType = function() {
if (!this.TYPE) {
throw new Error('The TYPE property has not been set.');
}
return this.TYPE;
};
/**
* Get the X axes.
*
* @return {module:core/chart_axis[]}
*/
Base.prototype.getXAxes = function() {
return this._xaxes;
};
/**
* Get an X axis.
*
* @param {Number} [index=0] The index of the axis.
* @param {Bool} [createIfNotExists=false] Create the instance of it does not exist at index.
* @return {module:core/chart_axis}
*/
Base.prototype.getXAxis = function(index, createIfNotExists) {
return this.__getAxis('x', index, createIfNotExists);
};
/**
* Get the Y axes.
*
* @return {module:core/chart_axis[]}
*/
Base.prototype.getYAxes = function() {
return this._yaxes;
};
/**
* Get an Y axis.
*
* @param {Number} [index=0] The index of the axis.
* @param {Bool} [createIfNotExists=false] Create the instance of it does not exist at index.
* @return {module:core/chart_axis}
*/
Base.prototype.getYAxis = function(index, createIfNotExists) {
return this.__getAxis('y', index, createIfNotExists);
};
/**
* Set colours defined by setting.
*
* @param {String[]} colorset An array of css colours.
* @protected
*/
Base.prototype.setConfigColorSet = function(colorset) {
this._configColorSet = colorset;
};
/**
* Set the defaults for this chart type.
*
* Child classes can extend this to set defaults values on instantiation.
*
* emphasize and self-document the defaults values set by the chart type.
*
* @protected
*/
Base.prototype._setDefaults = function() {
// For the children to extend.
};
/**
* Set the labels of the X axis.
*
* This requires for each series to contain strictly as many values as there
* are labels.
*
* @param {String[]} labels The labels.
*/
Base.prototype.setLabels = function(labels) {
if (labels.length && this._series.length && this._series[0].length != labels.length) {
throw new Error('Series must match label values.');
}
this._labels = labels;
};
/**
* Set options for chart legend display.
*
* @param {Object} legendOptions
*/
Base.prototype.setLegendOptions = function(legendOptions) {
if (typeof legendOptions !== 'object') {
throw new Error('Setting legend with non-object value:' + legendOptions);
}
this._legendOptions = legendOptions;
};
/**
* Set the title of the chart.
*
* @param {String} title The title.
*/
Base.prototype.setTitle = function(title) {
this._title = title;
};
/**
* Set an X axis.
*
* Note that this will override any predefined axis without warning.
*
* @param {module:core/chart_axis} axis The axis.
* @param {Number} [index=0] The index of the axis.
*/
Base.prototype.setXAxis = function(axis, index) {
index = typeof index === 'undefined' ? 0 : index;
this._validateAxis('x', axis, index);
this._xaxes[index] = axis;
};
/**
* Set a Y axis.
*
* Note that this will override any predefined axis without warning.
*
* @param {module:core/chart_axis} axis The axis.
* @param {Number} [index=0] The index of the axis.
*/
Base.prototype.setYAxis = function(axis, index) {
index = typeof index === 'undefined' ? 0 : index;
this._validateAxis('y', axis, index);
this._yaxes[index] = axis;
};
/**
* Validate an axis.
*
* @protected
* @param {String} xy X or Y axis.
* @param {module:core/chart_axis} axis The axis to validate.
* @param {Number} [index=0] The index of the axis.
*/
Base.prototype._validateAxis = function(xy, axis, index) {
index = typeof index === 'undefined' ? 0 : index;
if (index > 0) {
var axes = xy == 'x' ? this._xaxes : this._yaxes;
if (typeof axes[index - 1] === 'undefined') {
throw new Error('Missing ' + xy + ' axis at index lower than ' + index);
}
}
};
/**
* Validate a series.
*
* @protected
* @param {module:core/chart_series} series The series to validate.
*/
Base.prototype._validateSeries = function(series) {
if (this._series.length && this._series[0].getCount() != series.getCount()) {
throw new Error('Series do not have an equal number of values.');
} else if (this._labels.length && this._labels.length != series.getCount()) {
throw new Error('Series must match label values.');
}
};
return Base;
});