lib/timeline/component/LineGraph.js
var util = require('../../util');
var DOMutil = require('../../DOMutil');
var DataSet = require('../../DataSet');
var DataView = require('../../DataView');
var Component = require('./Component');
var DataAxis = require('./DataAxis');
var GraphGroup = require('./GraphGroup');
var Legend = require('./Legend');
var Bars = require('./graph2d_types/bar');
var Lines = require('./graph2d_types/line');
var Points = require('./graph2d_types/points');
var UNGROUPED = '__ungrouped__'; // reserved group id for ungrouped items
/**
* This is the constructor of the LineGraph. It requires a Timeline body and options.
*
* @param {vis.Timeline.body} body
* @param {Object} options
* @constructor LineGraph
* @extends Component
*/
function LineGraph(body, options) {
this.id = util.randomUUID();
this.body = body;
this.defaultOptions = {
yAxisOrientation: 'left',
defaultGroup: 'default',
sort: true,
sampling: true,
stack: false,
graphHeight: '400px',
shaded: {
enabled: false,
orientation: 'bottom' // top, bottom, zero
},
style: 'line', // line, bar
barChart: {
width: 50,
sideBySide: false,
align: 'center' // left, center, right
},
interpolation: {
enabled: true,
parametrization: 'centripetal', // uniform (alpha = 0.0), chordal (alpha = 1.0), centripetal (alpha = 0.5)
alpha: 0.5
},
drawPoints: {
enabled: true,
size: 6,
style: 'square' // square, circle
},
dataAxis: {}, //Defaults are done on DataAxis level
legend: {}, //Defaults are done on Legend level
groups: {
visibility: {}
}
};
// options is shared by this lineGraph and all its items
this.options = util.extend({}, this.defaultOptions);
this.dom = {};
this.props = {};
this.hammer = null;
this.groups = {};
this.abortedGraphUpdate = false;
this.updateSVGheight = false;
this.updateSVGheightOnResize = false;
this.forceGraphUpdate = true;
var me = this;
this.itemsData = null; // DataSet
this.groupsData = null; // DataSet
// listeners for the DataSet of the items
this.itemListeners = {
'add': function (event, params, senderId) { // eslint-disable-line no-unused-vars
me._onAdd(params.items);
},
'update': function (event, params, senderId) { // eslint-disable-line no-unused-vars
me._onUpdate(params.items);
},
'remove': function (event, params, senderId) { // eslint-disable-line no-unused-vars
me._onRemove(params.items);
}
};
// listeners for the DataSet of the groups
this.groupListeners = {
'add': function (event, params, senderId) { // eslint-disable-line no-unused-vars
me._onAddGroups(params.items);
},
'update': function (event, params, senderId) { // eslint-disable-line no-unused-vars
me._onUpdateGroups(params.items);
},
'remove': function (event, params, senderId) { // eslint-disable-line no-unused-vars
me._onRemoveGroups(params.items);
}
};
this.items = {}; // object with an Item for every data item
this.selection = []; // list with the ids of all selected nodes
this.lastStart = this.body.range.start;
this.touchParams = {}; // stores properties while dragging
this.svgElements = {};
this.setOptions(options);
this.groupsUsingDefaultStyles = [0];
this.body.emitter.on('rangechanged', function () {
me.lastStart = me.body.range.start;
me.svg.style.left = util.option.asSize(-me.props.width);
me.forceGraphUpdate = true;
//Is this local redraw necessary? (Core also does a change event!)
me.redraw.call(me);
});
// create the HTML DOM
this._create();
this.framework = {svg: this.svg, svgElements: this.svgElements, options: this.options, groups: this.groups};
}
LineGraph.prototype = new Component();
/**
* Create the HTML DOM for the ItemSet
*/
LineGraph.prototype._create = function () {
var frame = document.createElement('div');
frame.className = 'vis-line-graph';
this.dom.frame = frame;
// create svg element for graph drawing.
this.svg = document.createElementNS('http://www.w3.org/2000/svg', 'svg');
this.svg.style.position = 'relative';
this.svg.style.height = ('' + this.options.graphHeight).replace('px', '') + 'px';
this.svg.style.display = 'block';
frame.appendChild(this.svg);
// data axis
this.options.dataAxis.orientation = 'left';
this.yAxisLeft = new DataAxis(this.body, this.options.dataAxis, this.svg, this.options.groups);
this.options.dataAxis.orientation = 'right';
this.yAxisRight = new DataAxis(this.body, this.options.dataAxis, this.svg, this.options.groups);
delete this.options.dataAxis.orientation;
// legends
this.legendLeft = new Legend(this.body, this.options.legend, 'left', this.options.groups);
this.legendRight = new Legend(this.body, this.options.legend, 'right', this.options.groups);
this.show();
};
/**
* set the options of the LineGraph. the mergeOptions is used for subObjects that have an enabled element.
* @param {object} options
*/
LineGraph.prototype.setOptions = function (options) {
if (options) {
var fields = ['sampling', 'defaultGroup', 'stack', 'height', 'graphHeight', 'yAxisOrientation', 'style', 'barChart', 'dataAxis', 'sort', 'groups'];
if (options.graphHeight === undefined && options.height !== undefined) {
this.updateSVGheight = true;
this.updateSVGheightOnResize = true;
}
else if (this.body.domProps.centerContainer.height !== undefined && options.graphHeight !== undefined) {
if (parseInt((options.graphHeight + '').replace("px", '')) < this.body.domProps.centerContainer.height) {
this.updateSVGheight = true;
}
}
util.selectiveDeepExtend(fields, this.options, options);
util.mergeOptions(this.options, options, 'interpolation');
util.mergeOptions(this.options, options, 'drawPoints');
util.mergeOptions(this.options, options, 'shaded');
util.mergeOptions(this.options, options, 'legend');
if (options.interpolation) {
if (typeof options.interpolation == 'object') {
if (options.interpolation.parametrization) {
if (options.interpolation.parametrization == 'uniform') {
this.options.interpolation.alpha = 0;
}
else if (options.interpolation.parametrization == 'chordal') {
this.options.interpolation.alpha = 1.0;
}
else {
this.options.interpolation.parametrization = 'centripetal';
this.options.interpolation.alpha = 0.5;
}
}
}
}
if (this.yAxisLeft) {
if (options.dataAxis !== undefined) {
this.yAxisLeft.setOptions(this.options.dataAxis);
this.yAxisRight.setOptions(this.options.dataAxis);
}
}
if (this.legendLeft) {
if (options.legend !== undefined) {
this.legendLeft.setOptions(this.options.legend);
this.legendRight.setOptions(this.options.legend);
}
}
if (this.groups.hasOwnProperty(UNGROUPED)) {
this.groups[UNGROUPED].setOptions(options);
}
}
// this is used to redraw the graph if the visibility of the groups is changed.
if (this.dom.frame) { //not on initial run?
this.forceGraphUpdate=true;
this.body.emitter.emit("_change",{queue: true});
}
};
/**
* Hide the component from the DOM
*/
LineGraph.prototype.hide = function () {
// remove the frame containing the items
if (this.dom.frame.parentNode) {
this.dom.frame.parentNode.removeChild(this.dom.frame);
}
};
/**
* Show the component in the DOM (when not already visible).
*/
LineGraph.prototype.show = function () {
// show frame containing the items
if (!this.dom.frame.parentNode) {
this.body.dom.center.appendChild(this.dom.frame);
}
};
/**
* Set items
* @param {vis.DataSet | null} items
*/
LineGraph.prototype.setItems = function (items) {
var me = this,
ids,
oldItemsData = this.itemsData;
// replace the dataset
if (!items) {
this.itemsData = null;
}
else if (items instanceof DataSet || items instanceof DataView) {
this.itemsData = items;
}
else {
throw new TypeError('Data must be an instance of DataSet or DataView');
}
if (oldItemsData) {
// unsubscribe from old dataset
util.forEach(this.itemListeners, function (callback, event) {
oldItemsData.off(event, callback);
});
// remove all drawn items
ids = oldItemsData.getIds();
this._onRemove(ids);
}
if (this.itemsData) {
// subscribe to new dataset
var id = this.id;
util.forEach(this.itemListeners, function (callback, event) {
me.itemsData.on(event, callback, id);
});
// add all new items
ids = this.itemsData.getIds();
this._onAdd(ids);
}
};
/**
* Set groups
* @param {vis.DataSet} groups
*/
LineGraph.prototype.setGroups = function (groups) {
var me = this;
var ids;
// unsubscribe from current dataset
if (this.groupsData) {
util.forEach(this.groupListeners, function (callback, event) {
me.groupsData.off(event, callback);
});
// remove all drawn groups
ids = this.groupsData.getIds();
this.groupsData = null;
for (var i = 0; i < ids.length; i++) {
this._removeGroup(ids[i]);
}
}
// replace the dataset
if (!groups) {
this.groupsData = null;
}
else if (groups instanceof DataSet || groups instanceof DataView) {
this.groupsData = groups;
}
else {
throw new TypeError('Data must be an instance of DataSet or DataView');
}
if (this.groupsData) {
// subscribe to new dataset
var id = this.id;
util.forEach(this.groupListeners, function (callback, event) {
me.groupsData.on(event, callback, id);
});
// draw all ms
ids = this.groupsData.getIds();
this._onAddGroups(ids);
}
};
LineGraph.prototype._onUpdate = function (ids) {
this._updateAllGroupData(ids);
};
LineGraph.prototype._onAdd = function (ids) {
this._onUpdate(ids);
};
LineGraph.prototype._onRemove = function (ids) {
this._onUpdate(ids);
};
LineGraph.prototype._onUpdateGroups = function (groupIds) {
this._updateAllGroupData(null, groupIds);
};
LineGraph.prototype._onAddGroups = function (groupIds) {
this._onUpdateGroups(groupIds);
};
/**
* this cleans the group out off the legends and the dataaxis, updates the ungrouped and updates the graph
* @param {Array} groupIds
* @private
*/
LineGraph.prototype._onRemoveGroups = function (groupIds) {
for (var i = 0; i < groupIds.length; i++) {
this._removeGroup(groupIds[i]);
}
this.forceGraphUpdate = true;
this.body.emitter.emit("_change",{queue: true});
};
/**
* this cleans the group out off the legends and the dataaxis
* @param {vis.GraphGroup.id} groupId
* @private
*/
LineGraph.prototype._removeGroup = function (groupId) {
if (this.groups.hasOwnProperty(groupId)) {
if (this.groups[groupId].options.yAxisOrientation == 'right') {
this.yAxisRight.removeGroup(groupId);
this.legendRight.removeGroup(groupId);
this.legendRight.redraw();
}
else {
this.yAxisLeft.removeGroup(groupId);
this.legendLeft.removeGroup(groupId);
this.legendLeft.redraw();
}
delete this.groups[groupId];
}
};
/**
* update a group object with the group dataset entree
*
* @param {vis.GraphGroup} group
* @param {vis.GraphGroup.id} groupId
* @private
*/
LineGraph.prototype._updateGroup = function (group, groupId) {
if (!this.groups.hasOwnProperty(groupId)) {
this.groups[groupId] = new GraphGroup(group, groupId, this.options, this.groupsUsingDefaultStyles);
if (this.groups[groupId].options.yAxisOrientation == 'right') {
this.yAxisRight.addGroup(groupId, this.groups[groupId]);
this.legendRight.addGroup(groupId, this.groups[groupId]);
}
else {
this.yAxisLeft.addGroup(groupId, this.groups[groupId]);
this.legendLeft.addGroup(groupId, this.groups[groupId]);
}
}
else {
this.groups[groupId].update(group);
if (this.groups[groupId].options.yAxisOrientation == 'right') {
this.yAxisRight.updateGroup(groupId, this.groups[groupId]);
this.legendRight.updateGroup(groupId, this.groups[groupId]);
//If yAxisOrientation changed, clean out the group from the other axis.
this.yAxisLeft.removeGroup(groupId);
this.legendLeft.removeGroup(groupId);
}
else {
this.yAxisLeft.updateGroup(groupId, this.groups[groupId]);
this.legendLeft.updateGroup(groupId, this.groups[groupId]);
//If yAxisOrientation changed, clean out the group from the other axis.
this.yAxisRight.removeGroup(groupId);
this.legendRight.removeGroup(groupId);
}
}
this.legendLeft.redraw();
this.legendRight.redraw();
};
/**
* this updates all groups, it is used when there is an update the the itemset.
*
* @param {Array} ids
* @param {Array} groupIds
* @private
*/
LineGraph.prototype._updateAllGroupData = function (ids, groupIds) {
if (this.itemsData != null) {
var groupsContent = {};
var items = this.itemsData.get();
var fieldId = this.itemsData._fieldId;
var idMap = {};
if (ids){
ids.map(function (id) {
idMap[id] = id;
});
}
//pre-Determine array sizes, for more efficient memory claim
var groupCounts = {};
for (var i = 0; i < items.length; i++) {
var item = items[i];
var groupId = item.group;
if (groupId === null || groupId === undefined) {
groupId = UNGROUPED;
}
groupCounts.hasOwnProperty(groupId) ? groupCounts[groupId]++ : groupCounts[groupId] = 1;
}
//Pre-load arrays from existing groups if items are not changed (not in ids)
var existingItemsMap = {};
if (!groupIds && ids) {
for (groupId in this.groups) {
if (this.groups.hasOwnProperty(groupId)) {
group = this.groups[groupId];
var existing_items = group.getItems();
groupsContent[groupId] = existing_items.filter(function (item) {
existingItemsMap[item[fieldId]] = item[fieldId];
return (item[fieldId] !== idMap[item[fieldId]]);
});
var newLength = groupCounts[groupId];
groupCounts[groupId] -= groupsContent[groupId].length;
if (groupsContent[groupId].length < newLength) {
groupsContent[groupId][newLength - 1] = {};
}
}
}
}
//Now insert data into the arrays.
for (i = 0; i < items.length; i++) {
item = items[i];
groupId = item.group;
if (groupId === null || groupId === undefined) {
groupId = UNGROUPED;
}
if (!groupIds && ids && (item[fieldId] !== idMap[item[fieldId]]) && existingItemsMap.hasOwnProperty(item[fieldId])) {
continue;
}
if (!groupsContent.hasOwnProperty(groupId)) {
groupsContent[groupId] = new Array(groupCounts[groupId]);
}
//Copy data (because of unmodifiable DataView input.
var extended = util.bridgeObject(item);
extended.x = util.convert(item.x, 'Date');
extended.end = util.convert(item.end, 'Date');
extended.orginalY = item.y; //real Y
extended.y = Number(item.y);
extended[fieldId] = item[fieldId];
var index= groupsContent[groupId].length - groupCounts[groupId]--;
groupsContent[groupId][index] = extended;
}
//Make sure all groups are present, to allow removal of old groups
for (groupId in this.groups){
if (this.groups.hasOwnProperty(groupId)){
if (!groupsContent.hasOwnProperty(groupId)) {
groupsContent[groupId] = new Array(0);
}
}
}
//Update legendas, style and axis
for (groupId in groupsContent) {
if (groupsContent.hasOwnProperty(groupId)) {
if (groupsContent[groupId].length == 0) {
if (this.groups.hasOwnProperty(groupId)) {
this._removeGroup(groupId);
}
} else {
var group = undefined;
if (this.groupsData != undefined) {
group = this.groupsData.get(groupId);
}
if (group == undefined) {
group = {id: groupId, content: this.options.defaultGroup + groupId};
}
this._updateGroup(group, groupId);
this.groups[groupId].setItems(groupsContent[groupId]);
}
}
}
this.forceGraphUpdate = true;
this.body.emitter.emit("_change",{queue: true});
}
};
/**
* Redraw the component, mandatory function
* @return {boolean} Returns true if the component is resized
*/
LineGraph.prototype.redraw = function () {
var resized = false;
// calculate actual size and position
this.props.width = this.dom.frame.offsetWidth;
this.props.height = this.body.domProps.centerContainer.height
- this.body.domProps.border.top
- this.body.domProps.border.bottom;
// check if this component is resized
resized = this._isResized() || resized;
// check whether zoomed (in that case we need to re-stack everything)
var visibleInterval = this.body.range.end - this.body.range.start;
var zoomed = (visibleInterval != this.lastVisibleInterval);
this.lastVisibleInterval = visibleInterval;
// the svg element is three times as big as the width, this allows for fully dragging left and right
// without reloading the graph. the controls for this are bound to events in the constructor
if (resized == true) {
this.svg.style.width = util.option.asSize(3 * this.props.width);
this.svg.style.left = util.option.asSize(-this.props.width);
// if the height of the graph is set as proportional, change the height of the svg
if ((this.options.height + '').indexOf("%") != -1 || this.updateSVGheightOnResize == true) {
this.updateSVGheight = true;
}
}
// update the height of the graph on each redraw of the graph.
if (this.updateSVGheight == true) {
if (this.options.graphHeight != this.props.height + 'px') {
this.options.graphHeight = this.props.height + 'px';
this.svg.style.height = this.props.height + 'px';
}
this.updateSVGheight = false;
}
else {
this.svg.style.height = ('' + this.options.graphHeight).replace('px', '') + 'px';
}
// zoomed is here to ensure that animations are shown correctly.
if (resized == true || zoomed == true || this.abortedGraphUpdate == true || this.forceGraphUpdate == true) {
resized = this._updateGraph() || resized;
this.forceGraphUpdate = false;
}
else {
// move the whole svg while dragging
if (this.lastStart != 0) {
var offset = this.body.range.start - this.lastStart;
var range = this.body.range.end - this.body.range.start;
if (this.props.width != 0) {
var rangePerPixelInv = this.props.width / range;
var xOffset = offset * rangePerPixelInv;
this.svg.style.left = (-this.props.width - xOffset) + 'px';
}
}
}
this.legendLeft.redraw();
this.legendRight.redraw();
return resized;
};
LineGraph.prototype._getSortedGroupIds = function(){
// getting group Ids
var grouplist = [];
for (var groupId in this.groups) {
if (this.groups.hasOwnProperty(groupId)) {
var group = this.groups[groupId];
if (group.visible == true && (this.options.groups.visibility[groupId] === undefined || this.options.groups.visibility[groupId] == true)) {
grouplist.push({id:groupId,zIndex:group.options.zIndex});
}
}
}
util.insertSort(grouplist,function(a,b){
var az = a.zIndex;
var bz = b.zIndex;
if (az === undefined) az=0;
if (bz === undefined) bz=0;
return az==bz? 0: (az<bz ? -1: 1);
});
var groupIds = new Array(grouplist.length);
for (var i=0; i< grouplist.length; i++){
groupIds[i] = grouplist[i].id;
}
return groupIds;
};
/**
* Update and redraw the graph.
*
* @returns {boolean}
* @private
*/
LineGraph.prototype._updateGraph = function () {
// reset the svg elements
DOMutil.prepareElements(this.svgElements);
if (this.props.width != 0 && this.itemsData != null) {
var group, i;
var groupRanges = {};
var changeCalled = false;
// this is the range of the SVG canvas
var minDate = this.body.util.toGlobalTime(-this.body.domProps.root.width);
var maxDate = this.body.util.toGlobalTime(2 * this.body.domProps.root.width);
// getting group Ids
var groupIds = this._getSortedGroupIds();
if (groupIds.length > 0) {
var groupsData = {};
// fill groups data, this only loads the data we require based on the timewindow
this._getRelevantData(groupIds, groupsData, minDate, maxDate);
// apply sampling, if disabled, it will pass through this function.
this._applySampling(groupIds, groupsData);
// we transform the X coordinates to detect collisions
for (i = 0; i < groupIds.length; i++) {
this._convertXcoordinates(groupsData[groupIds[i]]);
}
// now all needed data has been collected we start the processing.
this._getYRanges(groupIds, groupsData, groupRanges);
// update the Y axis first, we use this data to draw at the correct Y points
changeCalled = this._updateYAxis(groupIds, groupRanges);
// at changeCalled, abort this update cycle as the graph needs another update with new Width input from the Redraw container.
// Cleanup SVG elements on abort.
if (changeCalled == true) {
DOMutil.cleanupElements(this.svgElements);
this.abortedGraphUpdate = true;
return true;
}
this.abortedGraphUpdate = false;
// With the yAxis scaled correctly, use this to get the Y values of the points.
var below = undefined;
for (i = 0; i < groupIds.length; i++) {
group = this.groups[groupIds[i]];
if (this.options.stack === true && this.options.style === 'line') {
if (group.options.excludeFromStacking == undefined || !group.options.excludeFromStacking) {
if (below != undefined) {
this._stack(groupsData[group.id], groupsData[below.id]);
if (group.options.shaded.enabled == true && group.options.shaded.orientation !== "group"){
if (group.options.shaded.orientation == "top" && below.options.shaded.orientation !== "group"){
below.options.shaded.orientation="group";
below.options.shaded.groupId=group.id;
} else {
group.options.shaded.orientation="group";
group.options.shaded.groupId=below.id;
}
}
}
below = group;
}
}
this._convertYcoordinates(groupsData[groupIds[i]], group);
}
//Precalculate paths and draw shading if appropriate. This will make sure the shading is always behind any lines.
var paths = {};
for (i = 0; i < groupIds.length; i++) {
group = this.groups[groupIds[i]];
if (group.options.style === 'line' && group.options.shaded.enabled == true) {
var dataset = groupsData[groupIds[i]];
if (dataset == null || dataset.length == 0) {
continue;
}
if (!paths.hasOwnProperty(groupIds[i])) {
paths[groupIds[i]] = Lines.calcPath(dataset, group);
}
if (group.options.shaded.orientation === "group") {
var subGroupId = group.options.shaded.groupId;
if (groupIds.indexOf(subGroupId) === -1) {
console.log(group.id + ": Unknown shading group target given:" + subGroupId);
continue;
}
if (!paths.hasOwnProperty(subGroupId)) {
paths[subGroupId] = Lines.calcPath(groupsData[subGroupId], this.groups[subGroupId]);
}
Lines.drawShading(paths[groupIds[i]], group, paths[subGroupId], this.framework);
}
else {
Lines.drawShading(paths[groupIds[i]], group, undefined, this.framework);
}
}
}
// draw the groups, calculating paths if still necessary.
Bars.draw(groupIds, groupsData, this.framework);
for (i = 0; i < groupIds.length; i++) {
group = this.groups[groupIds[i]];
if (groupsData[groupIds[i]].length > 0) {
switch (group.options.style) {
case "line":
if (!paths.hasOwnProperty(groupIds[i])) {
paths[groupIds[i]] = Lines.calcPath(groupsData[groupIds[i]], group);
}
Lines.draw(paths[groupIds[i]], group, this.framework);
// eslint-disable-line no-fallthrough
case "point":
// eslint-disable-line no-fallthrough
case "points":
if (group.options.style == "point" || group.options.style == "points" || group.options.drawPoints.enabled == true) {
Points.draw(groupsData[groupIds[i]], group, this.framework);
}
break;
case "bar":
// bar needs to be drawn enmasse
// eslint-disable-line no-fallthrough
default:
//do nothing...
}
}
}
}
}
// cleanup unused svg elements
DOMutil.cleanupElements(this.svgElements);
return false;
};
LineGraph.prototype._stack = function (data, subData) {
var index, dx, dy, subPrevPoint, subNextPoint;
index = 0;
// for each data point we look for a matching on in the set below
for (var j = 0; j < data.length; j++) {
subPrevPoint = undefined;
subNextPoint = undefined;
// we look for time matches or a before-after point
for (var k = index; k < subData.length; k++) {
// if times match exactly
if (subData[k].x === data[j].x) {
subPrevPoint = subData[k];
subNextPoint = subData[k];
index = k;
break;
}
else if (subData[k].x > data[j].x) { // overshoot
subNextPoint = subData[k];
if (k == 0) {
subPrevPoint = subNextPoint;
}
else {
subPrevPoint = subData[k - 1];
}
index = k;
break;
}
}
// in case the last data point has been used, we assume it stays like this.
if (subNextPoint === undefined) {
subPrevPoint = subData[subData.length - 1];
subNextPoint = subData[subData.length - 1];
}
// linear interpolation
dx = subNextPoint.x - subPrevPoint.x;
dy = subNextPoint.y - subPrevPoint.y;
if (dx == 0) {
data[j].y = data[j].orginalY + subNextPoint.y;
}
else {
data[j].y = data[j].orginalY + (dy / dx) * (data[j].x - subPrevPoint.x) + subPrevPoint.y; // ax + b where b is data[j].y
}
}
}
/**
* first select and preprocess the data from the datasets.
* the groups have their preselection of data, we now loop over this data to see
* what data we need to draw. Sorted data is much faster.
* more optimization is possible by doing the sampling before and using the binary search
* to find the end date to determine the increment.
*
* @param {array} groupIds
* @param {object} groupsData
* @param {date} minDate
* @param {date} maxDate
* @private
*/
LineGraph.prototype._getRelevantData = function (groupIds, groupsData, minDate, maxDate) {
var group, i, j, item;
if (groupIds.length > 0) {
for (i = 0; i < groupIds.length; i++) {
group = this.groups[groupIds[i]];
var itemsData = group.getItems();
// optimization for sorted data
if (group.options.sort == true) {
var dateComparator = function (a, b) {
return a.getTime() == b.getTime() ? 0 : a < b ? -1 : 1
};
var first = Math.max(0, util.binarySearchValue(itemsData, minDate, 'x', 'before', dateComparator));
var last = Math.min(itemsData.length, util.binarySearchValue(itemsData, maxDate, 'x', 'after', dateComparator) + 1);
if (last <= 0) {
last = itemsData.length;
}
var dataContainer = new Array(last-first);
for (j = first; j < last; j++) {
item = group.itemsData[j];
dataContainer[j-first] = item;
}
groupsData[groupIds[i]] = dataContainer;
}
else {
// If unsorted data, all data is relevant, just returning entire structure
groupsData[groupIds[i]] = group.itemsData;
}
}
}
};
/**
*
* @param {Array.<vis.GraphGroup.id>} groupIds
* @param {vis.DataSet} groupsData
* @private
*/
LineGraph.prototype._applySampling = function (groupIds, groupsData) {
var group;
if (groupIds.length > 0) {
for (var i = 0; i < groupIds.length; i++) {
group = this.groups[groupIds[i]];
if (group.options.sampling == true) {
var dataContainer = groupsData[groupIds[i]];
if (dataContainer.length > 0) {
var increment = 1;
var amountOfPoints = dataContainer.length;
// the global screen is used because changing the width of the yAxis may affect the increment, resulting in an endless loop
// of width changing of the yAxis.
//TODO: This assumes sorted data, but that's not guaranteed!
var xDistance = this.body.util.toGlobalScreen(dataContainer[dataContainer.length - 1].x) - this.body.util.toGlobalScreen(dataContainer[0].x);
var pointsPerPixel = amountOfPoints / xDistance;
increment = Math.min(Math.ceil(0.2 * amountOfPoints), Math.max(1, Math.round(pointsPerPixel)));
var sampledData = new Array(amountOfPoints);
for (var j = 0; j < amountOfPoints; j += increment) {
var idx = Math.round(j/increment);
sampledData[idx]=dataContainer[j];
}
groupsData[groupIds[i]] = sampledData.splice(0,Math.round(amountOfPoints/increment));
}
}
}
}
};
/**
*
* @param {Array.<vis.GraphGroup.id>} groupIds
* @param {vis.DataSet} groupsData
* @param {object} groupRanges | this is being filled here
* @private
*/
LineGraph.prototype._getYRanges = function (groupIds, groupsData, groupRanges) {
var groupData, group, i;
var combinedDataLeft = [];
var combinedDataRight = [];
var options;
if (groupIds.length > 0) {
for (i = 0; i < groupIds.length; i++) {
groupData = groupsData[groupIds[i]];
options = this.groups[groupIds[i]].options;
if (groupData.length > 0) {
group = this.groups[groupIds[i]];
// if bar graphs are stacked, their range need to be handled differently and accumulated over all groups.
if (options.stack === true && options.style === 'bar') {
if (options.yAxisOrientation === 'left') {
combinedDataLeft = combinedDataLeft.concat(groupData);
}
else {
combinedDataRight = combinedDataRight.concat(groupData);
}
}
else {
groupRanges[groupIds[i]] = group.getYRange(groupData, groupIds[i]);
}
}
}
// if bar graphs are stacked, their range need to be handled differently and accumulated over all groups.
Bars.getStackedYRange(combinedDataLeft, groupRanges, groupIds, '__barStackLeft', 'left');
Bars.getStackedYRange(combinedDataRight, groupRanges, groupIds, '__barStackRight', 'right');
}
};
/**
* this sets the Y ranges for the Y axis. It also determines which of the axis should be shown or hidden.
* @param {Array.<vis.GraphGroup.id>} groupIds
* @param {Object} groupRanges
* @returns {boolean} resized
* @private
*/
LineGraph.prototype._updateYAxis = function (groupIds, groupRanges) {
var resized = false;
var yAxisLeftUsed = false;
var yAxisRightUsed = false;
var minLeft = 1e9, minRight = 1e9, maxLeft = -1e9, maxRight = -1e9, minVal, maxVal;
// if groups are present
if (groupIds.length > 0) {
// this is here to make sure that if there are no items in the axis but there are groups, that there is no infinite draw/redraw loop.
for (var i = 0; i < groupIds.length; i++) {
var group = this.groups[groupIds[i]];
if (group && group.options.yAxisOrientation != 'right') {
yAxisLeftUsed = true;
minLeft = 1e9;
maxLeft = -1e9;
}
else if (group && group.options.yAxisOrientation) {
yAxisRightUsed = true;
minRight = 1e9;
maxRight = -1e9;
}
}
// if there are items:
for (i = 0; i < groupIds.length; i++) {
if (groupRanges.hasOwnProperty(groupIds[i])) {
if (groupRanges[groupIds[i]].ignore !== true) {
minVal = groupRanges[groupIds[i]].min;
maxVal = groupRanges[groupIds[i]].max;
if (groupRanges[groupIds[i]].yAxisOrientation != 'right') {
yAxisLeftUsed = true;
minLeft = minLeft > minVal ? minVal : minLeft;
maxLeft = maxLeft < maxVal ? maxVal : maxLeft;
}
else {
yAxisRightUsed = true;
minRight = minRight > minVal ? minVal : minRight;
maxRight = maxRight < maxVal ? maxVal : maxRight;
}
}
}
}
if (yAxisLeftUsed == true) {
this.yAxisLeft.setRange(minLeft, maxLeft);
}
if (yAxisRightUsed == true) {
this.yAxisRight.setRange(minRight, maxRight);
}
}
resized = this._toggleAxisVisiblity(yAxisLeftUsed, this.yAxisLeft) || resized;
resized = this._toggleAxisVisiblity(yAxisRightUsed, this.yAxisRight) || resized;
if (yAxisRightUsed == true && yAxisLeftUsed == true) {
this.yAxisLeft.drawIcons = true;
this.yAxisRight.drawIcons = true;
}
else {
this.yAxisLeft.drawIcons = false;
this.yAxisRight.drawIcons = false;
}
this.yAxisRight.master = !yAxisLeftUsed;
this.yAxisRight.masterAxis = this.yAxisLeft;
if (this.yAxisRight.master == false) {
if (yAxisRightUsed == true) {
this.yAxisLeft.lineOffset = this.yAxisRight.width;
}
else {
this.yAxisLeft.lineOffset = 0;
}
resized = this.yAxisLeft.redraw() || resized;
resized = this.yAxisRight.redraw() || resized;
}
else {
resized = this.yAxisRight.redraw() || resized;
}
// clean the accumulated lists
var tempGroups = ['__barStackLeft', '__barStackRight', '__lineStackLeft', '__lineStackRight'];
for (i = 0; i < tempGroups.length; i++) {
if (groupIds.indexOf(tempGroups[i]) != -1) {
groupIds.splice(groupIds.indexOf(tempGroups[i]), 1);
}
}
return resized;
};
/**
* This shows or hides the Y axis if needed. If there is a change, the changed event is emitted by the updateYAxis function
*
* @param {boolean} axisUsed
* @param {vis.DataAxis} axis
* @returns {boolean}
* @private
*/
LineGraph.prototype._toggleAxisVisiblity = function (axisUsed, axis) {
var changed = false;
if (axisUsed == false) {
if (axis.dom.frame.parentNode && axis.hidden == false) {
axis.hide();
changed = true;
}
}
else {
if (!axis.dom.frame.parentNode && axis.hidden == true) {
axis.show();
changed = true;
}
}
return changed;
};
/**
* This uses the DataAxis object to generate the correct X coordinate on the SVG window. It uses the
* util function toScreen to get the x coordinate from the timestamp. It also pre-filters the data and get the minMax ranges for
* the yAxis.
*
* @param {Array.<Object>} datapoints
* @private
*/
LineGraph.prototype._convertXcoordinates = function (datapoints) {
var toScreen = this.body.util.toScreen;
for (var i = 0; i < datapoints.length; i++) {
datapoints[i].screen_x = toScreen(datapoints[i].x) + this.props.width;
datapoints[i].screen_y = datapoints[i].y; //starting point for range calculations
if (datapoints[i].end != undefined) {
datapoints[i].screen_end = toScreen(datapoints[i].end) + this.props.width;
}
else {
datapoints[i].screen_end = undefined;
}
}
};
/**
* This uses the DataAxis object to generate the correct X coordinate on the SVG window. It uses the
* util function toScreen to get the x coordinate from the timestamp. It also pre-filters the data and get the minMax ranges for
* the yAxis.
*
* @param {Array.<Object>} datapoints
* @param {vis.GraphGroup} group
* @private
*/
LineGraph.prototype._convertYcoordinates = function (datapoints, group) {
var axis = this.yAxisLeft;
var svgHeight = Number(this.svg.style.height.replace('px', ''));
if (group.options.yAxisOrientation == 'right') {
axis = this.yAxisRight;
}
for (var i = 0; i < datapoints.length; i++) {
datapoints[i].screen_y = Math.round(axis.convertValue(datapoints[i].y));
}
group.setZeroPosition(Math.min(svgHeight, axis.convertValue(0)));
};
module.exports = LineGraph;