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package com.senocular.gyro {
/**
* Seekers follow target at a constant speed
*/
public class SeekConstantMove extends SeekMove {
protected var _speed:Number = 1;
/**
* A value between 0 and 1 representing how quickly
* a seeker speedes the target with every step
*/
public function get speed():Number {
return _speed;
}
public function set speed(n:Number):void {
_speed = n;
}
/**
* Constructor
*/
public function SeekConstantMove(speed:Number = 1){
this.speed = speed;
}
/**
* Seek method; matches seeker properties
* to target properties based on the properties list
*/
public override function follow(target:*, seeker:*):void {
if (!_speed) return;
// get the differences of x and y location
var dx:Number = target.x - seeker.x;
var dy:Number = target.y - seeker.y;
// get the disatance away from the target
// using the differences (pythagorean theorem)
var dist:Number = Math.sqrt(dx*dx + dy*dy);
// if there is disatnce between the seeker and
// the target locations, move towards the target
if (dist > 0) {
var angle:Number = Math.atan2(dy, dx);
// if orienting, rotate to point
// to the target location
if (_orient) {
seeker.rotation = angle*TO_DEGREES;
}
// if the distance is still greater than
// the distance traveled every step
// move towards the target
if (dist > _speed) {
seeker.x += _speed * Math.cos(angle);
seeker.y += _speed * Math.sin(angle);
if (_atDestination) _atDestination = false;
// if the distance is less than speed
// set the location to match the target
}else{
seeker.x = target.x;
seeker.y = target.y;
if (!_atDestination) atDestination = true;
}
}
}
}
}
