Airlines
Global air traffic simulation.
- data is for April 2010, converted from http://arm.64hosts.com/
- data had no schedule information, this part is random
- data had equipment info, but I was too lazy to look up
flight speeds for 310 models, so they all fly at same speed
- earth map from http://visibleearth.nasa.gov/view_rec.php?id=2433
@author makc
@license WTFPLv2, http://sam.zoy.org/wtfpl/
package {
import flash.display.Bitmap;
import flash.display.BitmapData;
import flash.display.Loader;
import flash.display.LoaderInfo;
import flash.display.Sprite;
import flash.events.Event;
import flash.geom.ColorTransform;
import flash.geom.Rectangle;
import flash.net.URLRequest;
import flash.system.LoaderContext;
/**
* Global air traffic simulation.
*
* - data is for April 2010, converted from http://arm.64hosts.com/
* - data had no schedule information, this part is random
* - data had equipment info, but I was too lazy to look up
* flight speeds for 310 models, so they all fly at same speed
* - earth map from http://visibleearth.nasa.gov/view_rec.php?id=2433
*
* @author makc
* @license WTFPLv2, http://sam.zoy.org/wtfpl/
*/
public class Airlines extends Sprite {
public function Airlines () {
// load map
var map:Loader = new Loader; addChild (map);
map.load (new URLRequest (/*"earth.jpg"*/
"http://assets.wonderfl.net/images/related_images/0/03/037b/037b0a54baa857c99f974c47c676ff0c53164cd3"
), new LoaderContext (true));
// load data
var data:Loader = new Loader;
data.contentLoaderInfo.addEventListener (Event.COMPLETE, onDataReady);
data.load (new URLRequest (/*"airlines.png"*/
"http://assets.wonderfl.net/images/related_images/9/99/9991/99916b6cd6bc516fdaa9247f809b2bde80fea5f5"
), new LoaderContext (true));
}
public var p:int = 0, color:uint;
public var airports:Vector.<Location>;
public var data:BitmapData, bd:BitmapData, ct:ColorTransform;
public var routes:Vector.<Vector.<Location>>;
public var particles:Vector.<Particle>;
public function onDataReady (e:Event):void {
data = Bitmap(LoaderInfo(e.target).content).bitmapData;
bd = new BitmapData (465, 465, true, 0); addChild (new Bitmap (bd));
ct = new ColorTransform (0.7, 1.0, 0.9, 0.9);
// unpack airports data
airports = new Vector.<Location>(3338, true);
while (p < 3338) {
color = data.getPixel (p % 252, p / 252);
airports [p] = new Location (
(2 * (color & 4095) / 4095.0 - 1) * Math.PI,
(1 - ((color >> 12) & 4095) / 4095.0) * Math.PI
);
//bd.setPixel32 (airports [p].sx, airports [p].sy, 0xFFFF0000);
p++;
}
// unpack routes data
// this takes some time, we have to async it...
routes = new Vector.<Vector.<Location>>(60237, true);
particles = new Vector.<Particle>(60237, true);
addEventListener (Event.ENTER_FRAME, unpackRoutes);
}
public function unpackRoutes (e:Event):void {
var count:int = 0;
while (count++ < 1000) {
color = data.getPixel (p % 252, p / 252);
var a:Location = airports [(color >> 12) & 4095];
var b:Location = airports [(color) & 4095];
var omega:Number = Math.acos (a.x * b.x + a.y * b.y + a.z * b.z);
var N:int = Math.max (3, omega / 0.006); // ~500 values for PI arc
routes [p - 3338] = new Vector.<Location> (N, true);
particles [p - 3338] = new Particle;
particles [p - 3338].i = int (Math.random () * (N - 1));
for (var i:int = 0; i < N; i++)
routes [p - 3338] [i] = a.slerp (b, i / (N -1));
p++; if (p - 3338 > 60237 - 1) {
// launch simulation
removeEventListener (Event.ENTER_FRAME, unpackRoutes);
addEventListener (Event.ENTER_FRAME, simulation);
break;
}
}
// show progress
var r:Rectangle = new Rectangle (50, 300, 365, 20);
bd.fillRect (r, 0x7F00FF00); r.width = 365 * p / (3338 + 60237);
bd.fillRect (r, 0xFF00FF00);
}
public function simulation (e:Event):void {
var A:int = Math.max (0, Math.min (60237, 60237 * mouseX / 465));
var B:int = Math.max (0, Math.min (60237, 60237 * mouseY / 465));
if (A > B) { var tmp:int = A; A = B; B = tmp; }
bd.lock ();
for (var i:int = A; i < B; i++) {
var route:Vector.<Location> = routes [i];
var particle:Particle = particles [i];
bd.setPixel32 (route [particle.i].sx, route [particle.i].sy, 0xFFFFFFFF);
particle.i += particle.di;
if ((particle.i < 0) || (particle.i > route.length - 1)) {
particle.i -= particle.di; particle.di *= -1;
}
}
bd.unlock (); bd.colorTransform (bd.rect, ct);
}
}
}
class Particle {
public var i:int = 0;
public var di:int = 1;
}
class Location {
public var sx:uint, sy:uint; // screen 2D coords
public var x:Number, y:Number, z:Number; // 3D coords
public function Location (phi:Number /* -PI...+PI */, tet:Number /* 0...+PI */) {
sx = 465 * (phi + Math.PI) / (2 * Math.PI);
sy = 465 * tet / Math.PI;
// http://en.wikipedia.org/wiki/Spherical_coordinate_system#Cartesian_coordinates
x = Math.sin (tet) * Math.cos (phi);
y = Math.sin (tet) * Math.sin (phi);
z = Math.cos (tet);
}
public function slerp (b:Location, t:Number):Location {
// http://en.wikipedia.org/wiki/Slerp
var omega:Number = Math.acos (x * b.x + y * b.y + z * b.z);
var sin_o:Number = Math.sin (omega)
var c0:Number = Math.sin ((1 - t) * omega) / sin_o;
var c1:Number = Math.sin (t * omega) / sin_o;
var cx:Number = c0 * x + c1 * b.x;
var cy:Number = c0 * y + c1 * b.y;
var cz:Number = c0 * z + c1 * b.z;
// http://en.wikipedia.org/wiki/Spherical_coordinate_system#Cartesian_coordinates
var tet:Number = Math.acos (Math.max ( -1, Math.min ( +1, cz)));
var phi:Number = Math.atan2 (cy, cx);
return new Location (phi, tet);
}
}