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293 lines
8.2 KiB
293 lines
8.2 KiB
var DataSet = require('../DataSet');
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var DataView = require('../DataView');
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var Range = require('./Range');
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/**
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* Creates a container for all data of one specific 3D-graph.
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*
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* On construction, the container is totally empty; the data
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* needs to be initialized with method initializeData().
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* Failure to do so will result in the following exception begin thrown
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* on instantiation of Graph3D:
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*
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* Error: Array, DataSet, or DataView expected
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*
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* @constructor
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*/
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function DataGroup() {
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this.dataTable = null; // The original data table
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}
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/**
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* Initializes the instance from the passed data.
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*
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* Calculates minimum and maximum values and column index values.
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*
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* The graph3d instance is used internally to access the settings for
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* the given instance.
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* TODO: Pass settings only instead.
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*
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* @param {Graph3D} graph3d Reference to the calling Graph3D instance.
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* @param {Array | DataSet | DataView} rawData The data containing the items for
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* the Graph.
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* @param {Number} style Style Number
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*/
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DataGroup.prototype.initializeData = function(graph3d, rawData, style) {
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if (rawData === undefined) return;
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if (Array.isArray(rawData)) {
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rawData = new DataSet(rawData);
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}
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var data;
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if (rawData instanceof DataSet || rawData instanceof DataView) {
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data = rawData.get();
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}
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else {
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throw new Error('Array, DataSet, or DataView expected');
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}
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if (data.length == 0) return;
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// unsubscribe from the dataTable
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if (this.dataSet) {
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this.dataSet.off('*', this._onChange);
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}
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this.dataSet = rawData;
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this.dataTable = data;
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// subscribe to changes in the dataset
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var me = this;
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this._onChange = function () {
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graph3d.setData(me.dataSet);
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};
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this.dataSet.on('*', this._onChange);
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// determine the location of x,y,z,value,filter columns
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this.colX = 'x';
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this.colY = 'y';
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this.colZ = 'z';
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var withBars = graph3d.hasBars(style);
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// determine barWidth from data
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if (withBars) {
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if (graph3d.defaultXBarWidth !== undefined) {
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this.xBarWidth = graph3d.defaultXBarWidth;
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}
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else {
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this.xBarWidth = this.getSmallestDifference(data, this.colX) || 1;
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}
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if (graph3d.defaultYBarWidth !== undefined) {
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this.yBarWidth = graph3d.defaultYBarWidth;
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}
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else {
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this.yBarWidth = this.getSmallestDifference(data, this.colY) || 1;
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}
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}
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// calculate minima and maxima
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this._initializeRange(data, this.colX, graph3d, withBars);
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this._initializeRange(data, this.colY, graph3d, withBars);
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this._initializeRange(data, this.colZ, graph3d, false);
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if (data[0].hasOwnProperty('style')) {
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this.colValue = 'style';
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var valueRange = this.getColumnRange(data, this.colValue);
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this._setRangeDefaults(valueRange, graph3d.defaultValueMin, graph3d.defaultValueMax);
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this.valueRange = valueRange;
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}
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};
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/**
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* Collect the range settings for the given data column.
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*
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* This internal method is intended to make the range
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* initalization more generic.
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*
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* TODO: if/when combined settings per axis defined, get rid of this.
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*
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* @private
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*
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* @param {'x'|'y'|'z'} column The data column to process
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* @param {Graph3D} graph3d Reference to the calling Graph3D instance;
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* required for access to settings
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*/
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DataGroup.prototype._collectRangeSettings = function(column, graph3d) {
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var index = ['x', 'y', 'z'].indexOf(column);
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if (index == -1) {
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throw new Error('Column \'' + column + '\' invalid');
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}
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var upper = column.toUpperCase();
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return {
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barWidth : this[column + 'BarWidth'],
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min : graph3d['default' + upper + 'Min'],
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max : graph3d['default' + upper + 'Max'],
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step : graph3d['default' + upper + 'Step'],
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range_label: column + 'Range', // Name of instance field to write to
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step_label : column + 'Step' // Name of instance field to write to
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};
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}
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/**
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* Initializes the settings per given column.
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*
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* TODO: if/when combined settings per axis defined, rewrite this.
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*
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* @private
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*
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* @param {DataSet | DataView} data The data containing the items for the Graph
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* @param {'x'|'y'|'z'} column The data column to process
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* @param {Graph3D} graph3d Reference to the calling Graph3D instance;
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* required for access to settings
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* @param {Boolean} withBars True if initializing for bar graph
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*/
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DataGroup.prototype._initializeRange = function(data, column, graph3d, withBars) {
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var NUMSTEPS = 5;
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var settings = this._collectRangeSettings(column, graph3d);
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var range = this.getColumnRange(data, column);
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if (withBars && column != 'z') { // Safeguard for 'z'; it doesn't have a bar width
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range.expand(settings.barWidth / 2);
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}
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this._setRangeDefaults(range, settings.min, settings.max);
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this[settings.range_label] = range;
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this[settings.step_label ] = (settings.step !== undefined) ? settings.step : range.range()/NUMSTEPS;
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}
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/**
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* Creates a list with all the different values in the data for the given column.
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*
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* If no data passed, use the internal data of this instance.
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*
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* @param {'x'|'y'|'z'} column The data column to process
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* @param {DataSet|DataView|undefined} data The data containing the items for the Graph
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*
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* @returns {Array} All distinct values in the given column data, sorted ascending.
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*/
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DataGroup.prototype.getDistinctValues = function(column, data) {
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if (data === undefined) {
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data = this.dataTable;
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}
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var values = [];
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for (var i = 0; i < data.length; i++) {
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var value = data[i][column] || 0;
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if (values.indexOf(value) === -1) {
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values.push(value);
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}
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}
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return values.sort(function(a,b) { return a - b; });
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};
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/**
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* Determine the smallest difference between the values for given
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* column in the passed data set.
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*
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* @param {DataSet|DataView|undefined} data The data containing the items for the Graph
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* @param {'x'|'y'|'z'} column The data column to process
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*
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* @returns {Number|null} Smallest difference value or
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* null, if it can't be determined.
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*/
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DataGroup.prototype.getSmallestDifference = function(data, column) {
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var values = this.getDistinctValues(data, column);
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// Get all the distinct diffs
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// Array values is assumed to be sorted here
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var smallest_diff = null;
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for (var i = 1; i < values.length; i++) {
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var diff = values[i] - values[i - 1];
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if (smallest_diff == null || smallest_diff > diff ) {
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smallest_diff = diff;
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}
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}
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return smallest_diff;
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}
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/**
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* Get the absolute min/max values for the passed data column.
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*
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* @param {DataSet|DataView|undefined} data The data containing the items for the Graph
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* @param {'x'|'y'|'z'} column The data column to process
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*
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* @returns {Range} A Range instance with min/max members properly set.
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*/
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DataGroup.prototype.getColumnRange = function(data, column) {
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var range = new Range();
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// Adjust the range so that it covers all values in the passed data elements.
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for (var i = 0; i < data.length; i++) {
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var item = data[i][column];
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range.adjust(item);
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}
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return range;
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};
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/**
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* Determines the number of rows in the current data.
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*
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* @returns {Number}
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*/
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DataGroup.prototype.getNumberOfRows = function() {
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return this.dataTable.length;
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}
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/**
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* Set default values for range
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*
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* The default values override the range values, if defined.
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*
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* Because it's possible that only defaultMin or defaultMax is set, it's better
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* to pass in a range already set with the min/max set from the data. Otherwise,
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* it's quite hard to process the min/max properly.
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*/
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DataGroup.prototype._setRangeDefaults = function (range, defaultMin, defaultMax) {
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if (defaultMin !== undefined) {
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range.min = defaultMin;
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}
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if (defaultMax !== undefined) {
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range.max = defaultMax;
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}
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// This is the original way that the default min/max values were adjusted.
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// TODO: Perhaps it's better if an error is thrown if the values do not agree.
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// But this will change the behaviour.
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if (range.max <= range.min) range.max = range.min + 1;
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};
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DataGroup.prototype.getDataTable = function() {
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return this.dataTable;
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};
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DataGroup.prototype.getDataSet = function() {
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return this.dataSet;
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};
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module.exports = DataGroup;
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