/**
* Copyright aobyrne ( http://wonderfl.net/user/aobyrne )
* MIT License ( http://www.opensource.org/licenses/mit-license.php )
* Downloaded from: http://wonderfl.net/c/ubO1
*/
package
{
import flash.display.Graphics;
import flash.display.Sprite;
import flash.display.StageAlign;
import flash.display.StageScaleMode;
import flash.events.Event;
import flash.geom.Vector3D;
public class EndlessCandy extends Sprite
{
private var _camTarget :WanderingTarget = new WanderingTarget();
private var wanderer:Sprite;
public function EndlessCandy()
{
stage.align = StageAlign.TOP_LEFT;
stage.scaleMode = StageScaleMode.NO_SCALE;
_camTarget.boundsCentre = new Vector3D(231, 231, 0);
_camTarget.boundsRadius = 231;
wanderer = addChild(new Sprite) as Sprite;
var g:Graphics = wanderer.graphics;
g.beginFill(0xff);
g.drawCircle(0, 0, 10);
addEventListener(Event.ENTER_FRAME, onRenderTick);
}
//override protected function onRenderTick(e:Event = null):void
private function onRenderTick(e:Event = null):void
{
_camTarget.wander();
_camTarget.update();
wanderer.x = _camTarget.x;
wanderer.y = _camTarget.y;
}
}
}
import flash.display.DisplayObject;
import flash.geom.Matrix3D;
import flash.geom.Point;
import flash.geom.Vector3D;
import org.papervision3d.cameras.Camera3D;
import org.papervision3d.objects.DisplayObject3D;
internal class WanderingTarget extends Point
{
/**
* SEE http://blog.soulwire.co.uk/laboratory/flash/as3-flocking-steering-behaviors
* SOUL WIRE
*/
private var _matrix : Matrix3D;
private var _maxForce : Number;
private var _maxSpeed : Number;
private var _distance : Number;
private var _drawScale : Number;
private var _maxForceSQ : Number;
private var _maxSpeedSQ : Number;
private var _velocity : Vector3D;
private var _position : Vector3D;
private var _oldPosition : Vector3D;
private var _acceleration : Vector3D;
private var _steeringForce : Vector3D;
private var _screenCoords : Point;
private var _renderData : DisplayObject;
private var _edgeBehavior : String;
private var _boundsRadius : Number;
private var _boundsCentre : Vector3D = new Vector3D();
private var _radius : Number = 10.0;
private var _wanderTheta : Number = 0.0;
private var _wanderRadius : Number = 16.0;
private var _wanderDistance : Number = 60.0;
private var _wanderStep : Number = 0.25;
private var _lookAtTarget : Boolean = true;
protected var _config : Object = {
minForce:3.0,
maxForce:6.0,
minSpeed:6.0,
maxSpeed:12.0,
minWanderDistance:10.0,
maxWanderDistance:100.0,
minWanderRadius:5.0,
maxWanderRadius:20.0,
minWanderStep:0.1,
maxWanderStep:0.9,
boundsRadius:250,
numBoids:120
};
public function WanderingTarget()
{
maxForce = 4;//random(_config.minForce, _config.maxForce);
maxSpeed = 10//;random(_config.minSpeed, _config.maxSpeed);
_wanderDistance = 25;//random(_config.minWanderDistance, _config.maxWanderDistance);
_wanderRadius = 15;//random(_config.minWanderRadius, _config.maxWanderRadius);
_wanderStep = 5;//random(_config.minWanderStep, _config.maxWanderStep);
super();
reset();
//super(fov, near, far, useCulling, useProjection);
}
/**
* Generates a random wandering force for the Boid.
* The results of this method can be controlled by the
* _wanderDistance, _wanderStep and _wanderRadius parameters
*
* @param multiplier
*
* By multiplying the force generated by this behavior,
* more or less weight can be given to this behavior in
* comparison to other behaviors being calculated by the
* Boid. To increase the weighting of this behavior, use
* a number above 1.0, or to decrease it use a number
* below 1.0
*/
public function wander( multiplier : Number = 1.0 ) : void
{
_wanderTheta += Math.random() * _wanderStep;
if ( Math.random() < 0.5 )
{
_wanderTheta = -_wanderTheta;
}
var pos : Vector3D = _velocity.clone();
//trace(pos)
pos.normalize();
pos.scaleBy(_wanderDistance);
pos.incrementBy(_position);
var offset : Vector3D = new Vector3D();
offset.x = _wanderRadius * Math.cos(_wanderTheta);
offset.y = _wanderRadius * Math.sin(_wanderTheta);
//offset.z = _wanderRadius * Math.tan(_wanderTheta);
// trace(offset)
//trace(_wanderRadius, _wanderTheta, pos, offset)
_steeringForce = steer(pos.add(offset));
if ( multiplier != 1.0 )
{
_steeringForce.scaleBy(multiplier);
}
// trace(_steeringForce)
_acceleration.incrementBy(_steeringForce);
}
private function steer( target : Vector3D, ease : Boolean = false, easeDistance : Number = 100 ) : Vector3D
{
//trace(_steeringForce,target.clone());
_steeringForce = target.clone();
_steeringForce.decrementBy(_position);
//trace(_steeringForce,target.clone());
_distance = _steeringForce.normalize();
//trace('ab', _distance)
if ( _distance > 0.00001 )
{
if ( _distance < easeDistance && ease )
{
_steeringForce.scaleBy(_maxSpeed * ( _distance / easeDistance ));
}
else
{
_steeringForce.scaleBy(_maxSpeed);
}
_steeringForce.decrementBy(_velocity);
if ( _steeringForce.lengthSquared > _maxForceSQ )
{
_steeringForce.normalize();
_steeringForce.scaleBy(_maxForce);
}
}
//trace(_steeringForce)
return _steeringForce;
}
public function update() : void
{
_oldPosition.x = _position.x;
_oldPosition.y = _position.y;
_oldPosition.z = _position.z;
_velocity.incrementBy(_acceleration);
if ( _velocity.lengthSquared > _maxSpeedSQ )
{
_velocity.normalize();
_velocity.scaleBy(_maxSpeed);
}
_position.incrementBy(_velocity);
x = _position.x;
y = _position.y;
//z = _position.z;
_acceleration.x = 0;
_acceleration.y = 0;
_acceleration.z = 0;
if ( isNaN(_boundsRadius) )
{
trace( "isNaN(_boundsRadius) : " + isNaN(_boundsRadius) );
return;
}
if( !_position.equals(_oldPosition) )
{
var distance : Number = Vector3D.distance(_position, _boundsCentre);
if( distance > _boundsRadius + _radius )
{
/**
* Move the boid to the edge of the boundary
* then invert it's velocity and step it
* forward back into the sphere
*/
_position.decrementBy(_boundsCentre);
_position.normalize();
_position.scaleBy(_boundsRadius + _radius);
_velocity.scaleBy(-1);
_position.incrementBy(_velocity);
_position.incrementBy(_boundsCentre);
}
}
}
/**
* Resets the Boid's position, velocity, acceleration and
* current steering force to zero
*/
public function reset() : void
{
_velocity = new Vector3D();
_position = new Vector3D();
_oldPosition = new Vector3D();
_acceleration = new Vector3D();
_steeringForce = new Vector3D();
_screenCoords = new Point();
}
/**
* The maximum force available to the Boid when
* calculating the steering force produced by
* the Boids steering bahaviors
*/
public function get maxForce() : Number
{
return _maxForce;
}
public function set maxForce( value : Number ) : void
{
if ( value < 0 )
{
value = 0;
}
_maxForce = value;
_maxForceSQ = value * value;
}
/**
* The maximum speed the Boid can reach
*/
public function get maxSpeed() : Number
{
return _maxSpeed;
}
public function set maxSpeed( value : Number ) : void
{
if ( value < 0 )
{
value = 0;
}
_maxSpeed = value;
_maxSpeedSQ = value * value;
}
protected function random( min : Number, max : Number = NaN ) : Number
{
if ( isNaN(max) )
{
max = min;
min = 0;
}
return Math.random() * ( max - min ) + min;
}
/**
* The centrepoint of the Boids bounding sphere.
* If the Boid travels futher than boundsRadius
* from this point the specified edge behavior
* will take affect.
*/
public function get boundsCentre() : Vector3D
{
return _boundsCentre;
}
public function set boundsCentre( value : Vector3D ) : void
{
_boundsCentre = value;
}
/**
* The maximum distance which this Boid can
* travel from it's boundsCentre before the
* specified edge behavior takes affect
*/
public function get boundsRadius() : Number
{
return _boundsRadius;
}
public function set boundsRadius( value : Number ) : void
{
_boundsRadius = value;
}
}