/
PathVisualizer.js
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/
PathVisualizer.js
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/*global define*/
define([
'../Core/AssociativeArray',
'../Core/Cartesian3',
'../Core/defined',
'../Core/destroyObject',
'../Core/DeveloperError',
'../Core/JulianDate',
'../Core/Matrix3',
'../Core/Matrix4',
'../Core/ReferenceFrame',
'../Core/TimeInterval',
'../Core/Transforms',
'../Scene/PolylineCollection',
'../Scene/SceneMode',
'./CompositePositionProperty',
'./ConstantPositionProperty',
'./MaterialProperty',
'./Property',
'./ReferenceProperty',
'./SampledPositionProperty',
'./ScaledPositionProperty',
'./TimeIntervalCollectionPositionProperty'
], function(
AssociativeArray,
Cartesian3,
defined,
destroyObject,
DeveloperError,
JulianDate,
Matrix3,
Matrix4,
ReferenceFrame,
TimeInterval,
Transforms,
PolylineCollection,
SceneMode,
CompositePositionProperty,
ConstantPositionProperty,
MaterialProperty,
Property,
ReferenceProperty,
SampledPositionProperty,
ScaledPositionProperty,
TimeIntervalCollectionPositionProperty) {
"use strict";
var defaultResolution = 60.0;
var defaultWidth = 1.0;
var scratchTimeInterval = new TimeInterval();
var subSampleCompositePropertyScratch = new TimeInterval();
var subSampleIntervalPropertyScratch = new TimeInterval();
var EntityData = function(entity) {
this.entity = entity;
this.polyline = undefined;
this.index = undefined;
this.updater = undefined;
};
function subSampleSampledProperty(property, start, stop, times, updateTime, referenceFrame, maximumStep, startingIndex, result) {
var r = startingIndex;
//Always step exactly on start (but only use it if it exists.)
var tmp;
tmp = property.getValueInReferenceFrame(start, referenceFrame, result[r]);
if (defined(tmp)) {
result[r++] = tmp;
}
var steppedOnNow = !defined(updateTime) || JulianDate.lessThanOrEquals(updateTime, start) || JulianDate.greaterThanOrEquals(updateTime, stop);
//Iterate over all interval times and add the ones that fall in our
//time range. Note that times can contain data outside of
//the intervals range. This is by design for use with interpolation.
var t = 0;
var len = times.length;
var current = times[t];
var loopStop = stop;
var sampling = false;
var sampleStepsToTake;
var sampleStepsTaken;
var sampleStepSize;
while (t < len) {
if (!steppedOnNow && JulianDate.greaterThanOrEquals(current, updateTime)) {
tmp = property.getValueInReferenceFrame(updateTime, referenceFrame, result[r]);
if (defined(tmp)) {
result[r++] = tmp;
}
steppedOnNow = true;
}
if (JulianDate.greaterThan(current, start) && JulianDate.lessThan(current, loopStop) && !current.equals(updateTime)) {
tmp = property.getValueInReferenceFrame(current, referenceFrame, result[r]);
if (defined(tmp)) {
result[r++] = tmp;
}
}
if (t < (len - 1)) {
if (maximumStep > 0 && !sampling) {
var next = times[t + 1];
var secondsUntilNext = JulianDate.secondsDifference(next, current);
sampling = secondsUntilNext > maximumStep;
if (sampling) {
sampleStepsToTake = Math.ceil(secondsUntilNext / maximumStep);
sampleStepsTaken = 0;
sampleStepSize = secondsUntilNext / Math.max(sampleStepsToTake, 2);
sampleStepsToTake = Math.max(sampleStepsToTake - 1, 1);
}
}
if (sampling && sampleStepsTaken < sampleStepsToTake) {
current = JulianDate.addSeconds(current, sampleStepSize, new JulianDate());
sampleStepsTaken++;
continue;
}
}
sampling = false;
t++;
current = times[t];
}
//Always step exactly on stop (but only use it if it exists.)
tmp = property.getValueInReferenceFrame(stop, referenceFrame, result[r]);
if (defined(tmp)) {
result[r++] = tmp;
}
return r;
}
function subSampleGenericProperty(property, start, stop, updateTime, referenceFrame, maximumStep, startingIndex, result) {
var tmp;
var i = 0;
var index = startingIndex;
var time = start;
var stepSize = Math.max(maximumStep, 60);
var steppedOnNow = !defined(updateTime) || JulianDate.lessThanOrEquals(updateTime, start) || JulianDate.greaterThanOrEquals(updateTime, stop);
while (JulianDate.lessThan(time, stop)) {
if (!steppedOnNow && JulianDate.greaterThanOrEquals(time, updateTime)) {
steppedOnNow = true;
tmp = property.getValueInReferenceFrame(updateTime, referenceFrame, result[index]);
if (defined(tmp)) {
result[index] = tmp;
index++;
}
}
tmp = property.getValueInReferenceFrame(time, referenceFrame, result[index]);
if (defined(tmp)) {
result[index] = tmp;
index++;
}
i++;
time = JulianDate.addSeconds(start, stepSize * i, new JulianDate());
}
//Always sample stop.
tmp = property.getValueInReferenceFrame(stop, referenceFrame, result[index]);
if (defined(tmp)) {
result[index] = tmp;
index++;
}
return index;
}
function subSampleIntervalProperty(property, start, stop, updateTime, referenceFrame, maximumStep, startingIndex, result) {
subSampleIntervalPropertyScratch.start = start;
subSampleIntervalPropertyScratch.stop = stop;
var index = startingIndex;
var intervals = property.intervals;
for (var i = 0; i < intervals.length; i++) {
var interval = intervals.get(i);
if (!TimeInterval.intersect(interval, subSampleIntervalPropertyScratch, scratchTimeInterval).isEmpty) {
var time = interval.start;
if (!interval.isStartIncluded) {
if (interval.isStopIncluded) {
time = interval.stop;
} else {
time = JulianDate.addSeconds(interval.start, JulianDate.secondsDifference(interval.stop, interval.start) / 2, new JulianDate());
}
}
var tmp = property.getValueInReferenceFrame(time, referenceFrame, result[index]);
if (defined(tmp)) {
result[index] = tmp;
index++;
}
}
}
return index;
}
function subSampleConstantProperty(property, start, stop, updateTime, referenceFrame, maximumStep, startingIndex, result) {
var tmp = property.getValueInReferenceFrame(start, referenceFrame, result[startingIndex]);
if (defined(tmp)) {
result[startingIndex++] = tmp;
}
return startingIndex;
}
function subSampleCompositeProperty(property, start, stop, updateTime, referenceFrame, maximumStep, startingIndex, result) {
subSampleCompositePropertyScratch.start = start;
subSampleCompositePropertyScratch.stop = stop;
var index = startingIndex;
var intervals = property.intervals;
for (var i = 0; i < intervals.length; i++) {
var interval = intervals.get(i);
if (!TimeInterval.intersect(interval, subSampleCompositePropertyScratch, scratchTimeInterval).isEmpty) {
var intervalStart = interval.start;
var intervalStop = interval.stop;
var sampleStart = start;
if (JulianDate.greaterThan(intervalStart, sampleStart)) {
sampleStart = intervalStart;
}
var sampleStop = stop;
if (JulianDate.lessThan(intervalStop, sampleStop)) {
sampleStop = intervalStop;
}
index = reallySubSample(interval.data, sampleStart, sampleStop, updateTime, referenceFrame, maximumStep, index, result);
}
}
return index;
}
function reallySubSample(property, start, stop, updateTime, referenceFrame, maximumStep, index, result) {
var innerProperty = property;
while (innerProperty instanceof ReferenceProperty || innerProperty instanceof ScaledPositionProperty) {
if (innerProperty instanceof ReferenceProperty) {
innerProperty = innerProperty.resolvedProperty;
}
if (innerProperty instanceof ScaledPositionProperty) {
innerProperty = innerProperty._value;
}
}
if (innerProperty instanceof SampledPositionProperty) {
var times = innerProperty._property._times;
index = subSampleSampledProperty(property, start, stop, times, updateTime, referenceFrame, maximumStep, index, result);
} else if (innerProperty instanceof CompositePositionProperty) {
index = subSampleCompositeProperty(property, start, stop, updateTime, referenceFrame, maximumStep, index, result);
} else if (innerProperty instanceof TimeIntervalCollectionPositionProperty) {
index = subSampleIntervalProperty(property, start, stop, updateTime, referenceFrame, maximumStep, index, result);
} else if (innerProperty instanceof ConstantPositionProperty) {
index = subSampleConstantProperty(property, start, stop, updateTime, referenceFrame, maximumStep, index, result);
} else {
//Fallback to generic sampling.
index = subSampleGenericProperty(property, start, stop, updateTime, referenceFrame, maximumStep, index, result);
}
return index;
}
function subSample(property, start, stop, updateTime, referenceFrame, maximumStep, result) {
if (!defined(result)) {
result = [];
}
var length = reallySubSample(property, start, stop, updateTime, referenceFrame, maximumStep, 0, result);
result.length = length;
return result;
}
var toFixedScratch = new Matrix3();
var PolylineUpdater = function(scene, referenceFrame) {
this._unusedIndexes = [];
this._polylineCollection = new PolylineCollection();
this._scene = scene;
this._referenceFrame = referenceFrame;
scene.primitives.add(this._polylineCollection);
};
PolylineUpdater.prototype.update = function(time) {
if (this._referenceFrame === ReferenceFrame.INERTIAL) {
var toFixed = Transforms.computeIcrfToFixedMatrix(time, toFixedScratch);
if (!defined(toFixed)) {
toFixed = Transforms.computeTemeToPseudoFixedMatrix(time, toFixedScratch);
}
Matrix4.fromRotationTranslation(toFixed, Cartesian3.ZERO, this._polylineCollection.modelMatrix);
}
};
PolylineUpdater.prototype.updateObject = function(time, item) {
var entity = item.entity;
var pathGraphics = entity._path;
var positionProperty = entity._position;
var sampleStart;
var sampleStop;
var showProperty = pathGraphics._show;
var polyline = item.polyline;
var show = entity.isShowing && (!defined(showProperty) || showProperty.getValue(time));
//While we want to show the path, there may not actually be anything to show
//depending on lead/trail settings. Compute the interval of the path to
//show and check against actual availability.
if (show) {
var leadTime = Property.getValueOrUndefined(pathGraphics._leadTime, time);
var trailTime = Property.getValueOrUndefined(pathGraphics._trailTime, time);
var availability = entity._availability;
var hasAvailability = defined(availability);
var hasLeadTime = defined(leadTime);
var hasTrailTime = defined(trailTime);
//Objects need to have either defined availability or both a lead and trail time in order to
//draw a path (since we can't draw "infinite" paths.
show = hasAvailability || (hasLeadTime && hasTrailTime);
//The final step is to compute the actual start/stop times of the path to show.
//If current time is outside of the availability interval, there's a chance that
//we won't have to draw anything anyway.
if (show) {
if (hasTrailTime) {
sampleStart = JulianDate.addSeconds(time, -trailTime, new JulianDate());
}
if (hasLeadTime) {
sampleStop = JulianDate.addSeconds(time, leadTime, new JulianDate());
}
if (hasAvailability) {
var start = availability.start;
var stop = availability.stop;
if (!hasTrailTime || JulianDate.greaterThan(start, sampleStart)) {
sampleStart = start;
}
if (!hasLeadTime || JulianDate.lessThan(stop, sampleStop)) {
sampleStop = stop;
}
}
show = JulianDate.lessThan(sampleStart, sampleStop);
}
}
if (!show) {
//don't bother creating or updating anything else
if (defined(polyline)) {
this._unusedIndexes.push(item.index);
item.polyline = undefined;
polyline.show = false;
item.index = undefined;
}
return;
}
if (!defined(polyline)) {
var unusedIndexes = this._unusedIndexes;
var length = unusedIndexes.length;
if (length > 0) {
var index = unusedIndexes.pop();
polyline = this._polylineCollection.get(index);
item.index = index;
} else {
item.index = this._polylineCollection.length;
polyline = this._polylineCollection.add();
}
polyline.id = entity;
item.polyline = polyline;
}
var resolution = Property.getValueOrDefault(pathGraphics._resolution, time, defaultResolution);
polyline.show = true;
polyline.positions = subSample(positionProperty, sampleStart, sampleStop, time, this._referenceFrame, resolution, polyline.positions);
polyline.material = MaterialProperty.getValue(time, pathGraphics._material, polyline.material);
polyline.width = Property.getValueOrDefault(pathGraphics._width, time, defaultWidth);
};
PolylineUpdater.prototype.removeObject = function(item) {
var polyline = item.polyline;
if (defined(polyline)) {
this._unusedIndexes.push(item.index);
item.polyline = undefined;
polyline.show = false;
item.index = undefined;
}
};
PolylineUpdater.prototype.destroy = function() {
this._scene.primitives.remove(this._polylineCollection);
return destroyObject(this);
};
/**
* A {@link Visualizer} which maps {@link Entity#path} to a {@link Polyline}.
* @alias PathVisualizer
* @constructor
*
* @param {Scene} scene The scene the primitives will be rendered in.
* @param {EntityCollection} entityCollection The entityCollection to visualize.
*/
var PathVisualizer = function(scene, entityCollection) {
//>>includeStart('debug', pragmas.debug);
if (!defined(scene)) {
throw new DeveloperError('scene is required.');
}
if (!defined(entityCollection)) {
throw new DeveloperError('entityCollection is required.');
}
//>>includeEnd('debug');
entityCollection.collectionChanged.addEventListener(PathVisualizer.prototype._onCollectionChanged, this);
this._scene = scene;
this._updaters = {};
this._entityCollection = entityCollection;
this._items = new AssociativeArray();
this._onCollectionChanged(entityCollection, entityCollection.values, [], []);
};
/**
* Updates all of the primitives created by this visualizer to match their
* Entity counterpart at the given time.
*
* @param {JulianDate} time The time to update to.
* @returns {Boolean} This function always returns true.
*/
PathVisualizer.prototype.update = function(time) {
//>>includeStart('debug', pragmas.debug);
if (!defined(time)) {
throw new DeveloperError('time is required.');
}
//>>includeEnd('debug');
var updaters = this._updaters;
for ( var key in updaters) {
if (updaters.hasOwnProperty(key)) {
updaters[key].update(time);
}
}
var items = this._items.values;
for (var i = 0, len = items.length; i < len; i++) {
var item = items[i];
var entity = item.entity;
var positionProperty = entity._position;
var lastUpdater = item.updater;
var frameToVisualize = ReferenceFrame.FIXED;
if (this._scene.mode === SceneMode.SCENE3D) {
frameToVisualize = positionProperty.referenceFrame;
}
var currentUpdater = this._updaters[frameToVisualize];
if ((lastUpdater === currentUpdater) && (defined(currentUpdater))) {
currentUpdater.updateObject(time, item);
continue;
}
if (defined(lastUpdater)) {
lastUpdater.removeObject(item);
}
if (!defined(currentUpdater)) {
currentUpdater = new PolylineUpdater(this._scene, frameToVisualize);
currentUpdater.update(time);
this._updaters[frameToVisualize] = currentUpdater;
}
item.updater = currentUpdater;
if (defined(currentUpdater)) {
currentUpdater.updateObject(time, item);
}
}
return true;
};
/**
* Returns true if this object was destroyed; otherwise, false.
*
* @returns {Boolean} True if this object was destroyed; otherwise, false.
*/
PathVisualizer.prototype.isDestroyed = function() {
return false;
};
/**
* Removes and destroys all primitives created by this instance.
*/
PathVisualizer.prototype.destroy = function() {
this._entityCollection.collectionChanged.removeEventListener(PathVisualizer.prototype._onCollectionChanged, this);
var updaters = this._updaters;
for ( var key in updaters) {
if (updaters.hasOwnProperty(key)) {
updaters[key].destroy();
}
}
return destroyObject(this);
};
PathVisualizer.prototype._onCollectionChanged = function(entityCollection, added, removed, changed) {
var i;
var entity;
var item;
var items = this._items;
for (i = added.length - 1; i > -1; i--) {
entity = added[i];
if (defined(entity._path) && defined(entity._position)) {
items.set(entity.id, new EntityData(entity));
}
}
for (i = changed.length - 1; i > -1; i--) {
entity = changed[i];
if (defined(entity._path) && defined(entity._position)) {
if (!items.contains(entity.id)) {
items.set(entity.id, new EntityData(entity));
}
} else {
item = items.get(entity.id);
if (defined(item)) {
item.updater.removeObject(item);
items.remove(entity.id);
}
}
}
for (i = removed.length - 1; i > -1; i--) {
entity = removed[i];
item = items.get(entity.id);
if (defined(item)) {
item.updater.removeObject(item);
items.remove(entity.id);
}
}
};
//for testing
PathVisualizer._subSample = subSample;
return PathVisualizer;
});