package { import flash.text.*; import flash.filters.*; import flash.geom.*; import flash.events.*; import flash.display.*; import net.hires.debug.Stats; import com.bit101.components.Label; [SWF(frameRate = 60)] final public class Main extends Sprite { public static const MAX:Number = 1000; public static const RANGE:Number = 50;//影響半径 public static const V_DIV:uint = Math.ceil(465 / RANGE); //横方向の分割数 public static const H_DIV:uint = Math.ceil(465 / RANGE); //縦方向の分割数 private var map:Vector.<Vector.<Vector.<Particle>>>; private var particles:Vector.<Particle>; private var img:BitmapData; private var numParticles:uint; private var color:ColorTransform; private var count:int; private var press:Boolean; private var text:Label; public function Main() { addEventListener( Event.ADDED_TO_STAGE, initialize ); } private function initialize( e:Event ):void { color = new ColorTransform( 0.80, 0.80, 0.85, 1, -3,-2,-2 ); particles = new Vector.<Particle>(); numParticles = 0; count = 0; img = new BitmapData(465, 465, false, 0); addEventListener(Event.EXIT_FRAME, frame); addChild( new Bitmap(img) ); stage.addEventListener(MouseEvent.MOUSE_DOWN, function(e:MouseEvent):void { press = true; }); stage.addEventListener(MouseEvent.MOUSE_UP, function(e:MouseEvent):void { press = false; } ); stage.addEventListener(MouseEvent.DOUBLE_CLICK, function(e:MouseEvent):void { addShark() } ); stage.quality = "low"; stage.doubleClickEnabled = true; stage.addChild( new Stats ).alpha = 0.5; text = new Label( stage, 75, 0, "numParticles: " + numParticles ); map = new Vector.< Vector.< Vector.<Particle> > >(H_DIV); map.fixed = true; for(var i:uint = 0; i<H_DIV; i++ ){ map[i] = new Vector.< Vector.<Particle> >(V_DIV); map[i].fixed = true; for(var j:uint = 0; j<H_DIV; j++ ){ map[i][j] = new Vector.< Particle >; } } } private function frame(e:Event):void { if(press) addSardine(); img.lock(); img.colorTransform(img.rect, color); setNeighbors(); move(); img.unlock(); text.text = "numParticles: " + numParticles; } private function addSardine():void { if( numParticles < MAX ){ const p:Particle = particles[numParticles++] = new Sardine( mouseX, mouseY ); p.move(); } } private function addShark():void { const p:Particle = particles[numParticles++] = new Shark( mouseX, mouseY ); p.move(); } private function setNeighbors():void { var dx:Number, dy:Number; const particles:Vector.<Particle> = this.particles; //分割された各領域ごとで近くのパーティクルをさがす。 for(var i:uint= 0; i < H_DIV; i++) { const mapi:Vector.<Vector.<Particle>> = map[i]; for(var j:uint = 0; j < V_DIV; j++){ var mapij:Vector.<Particle> = mapi[j]; var minN:int = i-1; if( minN < 0 ){ minN = 0 } var minM:int = j-1; if( minM < 0 ){ minM = 0 } var maxN:int = i+2; if( maxN > H_DIV ){ maxN = H_DIV } var maxM:int = j+2; if( maxM > V_DIV ){ maxM = V_DIV } for each( var pi:Particle in mapij ){ l:{ for(var n:uint = minN; n < maxN; n++ ){ const mapn:Vector.<Vector.<Particle>> = map[n]; for(var m:uint = minM; m < maxM; m++ ){ const mapnm:Vector.<Particle> = mapn[m]; for each(var pj:Particle in mapnm ){ //piと同じパーティクルが現れたら終了 if ( pi == pj ) { break l; } pi.lookAt( pj ); pj.lookAt( pi ); } } } } } } } } private function move():void { count++; const img:BitmapData = this.img; const particles:Vector.<Particle> = this.particles; for(var i:uint = 0; i < numParticles; i++) { const pi:Particle = particles[i]; if ( pi.life <= 0 ) { particles.splice( i, 1 ); pi.moveMap( map ); numParticles--; i--; }else{ pi.move(); pi.moveMap( map ); pi.draw( img ); } } } } } import flash.display.*; import flash.geom.*; class Particle { public var x:Number; //x方向の位置 public var y:Number; //y方向の位置 public var mapX:uint; public var mapY:uint; public var vx:Number; //vx方向の位置 public var vy:Number; //vy方向の位置 public var fx:Number; //x方向の加速度 public var fy:Number; //y方向の加速度 public static const DF:Number = 0.96; //抵抗係数 public var color:uint = 0xFFFFFF; public var life:int = 1; public function Particle(x:Number, y:Number) { this.x = x; this.y = y; vx = vy = 0; fx = fy = 0; } public function move():void { x += vx += fx; y += vy += fy; vx *= DF; vy *= DF; fx = 0; fy = 0; if (x < 1 ) { vy = 0; vx = 0; x = 1; } else if(x > 464 ){ vy = 0; vx = 0; x = 464 } if(y < 1 ){ vy = 0; vx = 0; y = 1; } else if(y > 464 ){ vy = 0; vx = 0; y = 464 } } public function lookAt( p:Particle ):void {} public function moveMap( map:Vector.<Vector.<Vector.<Particle>>> ):void { const mx:int = this.x / Main.RANGE; const my:int = this.y / Main.RANGE; const pmx:int = this.mapX; const pmy:int = this.mapY; if( life == 0 || mx != pmx || my != pmy ){ const mp:Vector.<Particle> = map[ pmx ][ pmy ] const index:int = mp.indexOf( this ); if ( index != -1) { mp.splice( index, 1 ); } if( life != 0 ){ map[ mx ][ my ].push( this ); this.mapY = my; this.mapX = mx; } } } public function draw( img:BitmapData ):void{ img.setPixel( x, y, color ) } } class Fish extends Particle { public var neighbor:Particle; public var d2:Number; public var dx:Number; public var dy:Number; function Fish( x:Number, y:Number ){ super( x, y ); } //壁際の処理 protected function wall( push:Number, r:Number ):void{ if ( x < r ) { fx += push / x; } else if ( x > 465 - r ) { fx -= push / (465 - x); } if ( y < r ) { fy += push / y; } else if ( y > 465 - r ) { fy -= push / (465 - y); } } //前方に加速 protected function thrust( f:Number, r:Number ):void { var vx2:Number = r * ( 1 - 2 * Math.random() ) + vx; var vy2:Number = r * ( 1 - 2 * Math.random() ) + vy; var v:Number = f * Math.random() / Math.sqrt( vx2 * vx2 + vy2 * vy2 ); fx += vx2 * v; fy += vy2 * v; } protected function guide( pull:Number, push:Number ):void { var d:Number = Math.sqrt( d2 ); var f:Number = -push/(d*d) + pull; fx += dx * f; fy += dy * f; } protected function escape( f:Number ):void { var r:Number = f / Math.sqrt( dx*dx + dy*dy ); fx -= dx * r; fy -= dy * r; } protected function chase( f:Number ):void { var r:Number = f// / Math.sqrt( dx*dx + dy*dy ); fx += dx * r; fy += dy * r; } //速度を丸める protected function round( min:Number, max:Number ):void{ var f2:Number = fx * fx + fy * fy; var r:Number; if ( f2 == 0 ) { }else{ if ( f2 < min*min ) { r = min / Math.sqrt( f2 ); fx *= r; fy *= r; }else if( f2 > max*max ){ r = max / Math.sqrt( f2 ); fx *= r; fy *= r; } } } } class Sardine extends Fish { private static const MAX:Number = 0.08; //最大の加速度 private static const MIN:Number = 0; //最小の加速度 private static const RANGE:Number = 40; //視界半径 private static const PULL:Number = 0.01; //引き寄せる力 private static const PUSH:Number = 0.5; //離れる力 private static const WALL:Number = 0.8; //壁から離れる力 private static const THRUST:Number = 0.05; //前方へ進む力 private static const RAND:Number = 0.2; //気まぐれの大きさ private static const RAND2:Number = 0.5; //気まぐれの大きさ2 function Sardine( x:Number, y:Number ){ super( x, y ); vx = ( 1 - 2 * Math.random() ) * .5; vy = ( 1 - 2 * Math.random() ) * .5; } override public function move():void { var f:Number, d:Number, dx:Number, dy:Number; if( neighbor is Shark ){ escape( MAX ); }else{ thrust( THRUST, RAND ); if ( neighbor is Fish ) { guide( PULL, PUSH ); } } neighbor = null; d2 = RANGE * RANGE; wall( WALL, RANGE ); round( MIN, MAX ); super.move(); } override public function lookAt( p:Particle ):void { var dx:Number, dy:Number, d2:Number; if( p is Shark ){ if ( neighbor is Sardine ) { this.dx = p.x - x; this.dy = p.y - y; this.d2 = dx * dx + dy * dy; neighbor = p; return; } dx = p.x - x; dy = p.y - y; d2 = dx * dx + dy * dy; if ( d2 < this.d2 ) { this.d2 = d2; this.dx = dx; this.dy = dy; neighbor = p; } }else if( p is Sardine ){ if ( neighbor is Shark ) { return; } if( Math.random() < RAND2 ){ return; } //時々一番近い魚の以外にも注目する。 dx = p.x - x; dy = p.y - y; d2 = dx * dx + dy * dy; if ( d2 < this.d2 ) { this.d2 = d2; this.dx = dx; this.dy = dy; neighbor = p; } } } } class Shark extends Fish { private static const MAX:Number = 0.1; //最大の加速度 private static const MIN:Number = 0.06; //最小の加速度 private static const RANGE:Number = 50; //視界半径 private static const PUSH:Number = 0.5; //離れる力 private static const WALL:Number = 1; //壁から離れる力 private static const THRUST:Number = 0.08; //前方へ進む力 private static const RAND:Number = 1; //気まぐれの大きさ private static const SIZE:Number = 2; private var shape:Shape = new Shape; function Shark( x:Number, y:Number ){ super( x, y ); vx = ( 1 - 2 * Math.random() ) * .5; vy = ( 1 - 2 * Math.random() ) * .5; with ( shape.graphics ) { beginFill( 0x6688FF, 1 ); drawCircle( 0, 0, SIZE ); } } override public function move():void { var f:Number, d:Number, dx:Number, dy:Number; if ( neighbor is Sardine ) { chase( MAX ); }else { thrust( THRUST, RAND ); if( neighbor is Shark ){ guide( 0, PUSH ) } } neighbor = null; d2 = RANGE * RANGE; wall( WALL, RANGE ); round( MIN, MAX ); super.move(); } override public function lookAt( p:Particle ):void { var dx:Number, dy:Number, d2:Number; if( p is Sardine ){ if ( neighbor is Shark ) { this.dx = p.x - x; this.dy = p.y - y; this.d2 = dx * dx + dy * dy; neighbor = p; return; } dx = p.x - x; dy = p.y - y; d2 = dx * dx + dy * dy; if ( d2 < this.d2 ) { this.d2 = d2; this.dx = dx; this.dy = dy; neighbor = p; } if( d2 < SIZE*SIZE ){ p.life = 0; } }else if( p is Shark ){ if ( neighbor is Sardine ) { return; } dx = p.x - x; dy = p.y - y; d2 = dx * dx + dy * dy; if ( d2 < this.d2 ) { this.d2 = d2; this.dx = dx; this.dy = dy; neighbor = p; } } } override public function draw(img:BitmapData):void { img.draw( shape, new Matrix(1,0,0,1,x,y) ); } }