75 lines
3.2 KiB
JavaScript
75 lines
3.2 KiB
JavaScript
// Copyright (c) 2001-2010, Purdue University. All rights reserved.
|
|
// Copyright (C) 2015 Apple Inc. All rights reserved.
|
|
//
|
|
// Redistribution and use in source and binary forms, with or without
|
|
// modification, are permitted provided that the following conditions are met:
|
|
// * Redistributions of source code must retain the above copyright
|
|
// notice, this list of conditions and the following disclaimer.
|
|
// * Redistributions in binary form must reproduce the above copyright
|
|
// notice, this list of conditions and the following disclaimer in the
|
|
// documentation and/or other materials provided with the distribution.
|
|
// * Neither the name of the Purdue University nor the
|
|
// names of its contributors may be used to endorse or promote products
|
|
// derived from this software without specific prior written permission.
|
|
//
|
|
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
|
|
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
|
|
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
|
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE FOR ANY
|
|
// DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
|
|
// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
|
|
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
|
|
// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
|
|
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
|
|
function CollisionDetector() {
|
|
this._state = new RedBlackTree();
|
|
}
|
|
|
|
CollisionDetector.prototype.handleNewFrame = function(frame) {
|
|
var motions = [];
|
|
var seen = new RedBlackTree();
|
|
|
|
for (var i = 0; i < frame.length; ++i) {
|
|
var aircraft = frame[i];
|
|
|
|
var oldPosition = this._state.put(aircraft.callsign, aircraft.position);
|
|
var newPosition = aircraft.position;
|
|
seen.put(aircraft.callsign, true);
|
|
|
|
if (!oldPosition) {
|
|
// Treat newly introduced aircraft as if they were stationary.
|
|
oldPosition = newPosition;
|
|
}
|
|
|
|
motions.push(new Motion(aircraft.callsign, oldPosition, newPosition));
|
|
}
|
|
|
|
// Remove aircraft that are no longer present.
|
|
var toRemove = [];
|
|
this._state.forEach(function(callsign, position) {
|
|
if (!seen.get(callsign))
|
|
toRemove.push(callsign);
|
|
});
|
|
for (var i = 0; i < toRemove.length; ++i)
|
|
this._state.remove(toRemove[i]);
|
|
|
|
var allReduced = reduceCollisionSet(motions);
|
|
var collisions = [];
|
|
for (var reductionIndex = 0; reductionIndex < allReduced.length; ++reductionIndex) {
|
|
var reduced = allReduced[reductionIndex];
|
|
for (var i = 0; i < reduced.length; ++i) {
|
|
var motion1 = reduced[i];
|
|
for (var j = i + 1; j < reduced.length; ++j) {
|
|
var motion2 = reduced[j];
|
|
var collision = motion1.findIntersection(motion2);
|
|
if (collision)
|
|
collisions.push(new Collision([motion1.callsign, motion2.callsign], collision));
|
|
}
|
|
}
|
|
}
|
|
|
|
return collisions;
|
|
};
|