Here’s a class that I wrote. It’s just a bunch of static functions to help find common values like the angle of an object, the point to tween to after that angle has been found etc etc…
package {
import flash.geom.Point;
/**
* @author Dan Sanderson
* @email dan@pldm.co.uk
* @url dev.pldm.co.uk
*/
public class PointFinder {
public static function findPoint(angle : Number, distance : Number) : Point {
var radian : Number = angle * (Math.PI/180);
var point : Point = new Point();
point.x = distance * Math.cos(radian);
point.y = distance * Math.sin(radian);
return point;
}
public static function findAngle(startPosition : Point, targetPosition : Point) : Number {
var newAngle : Number;
if(targetPosition) {
var newX : Number = startPosition.x - targetPosition.x;
var newY : Number = startPosition.y - targetPosition.y;
newAngle = -Math.atan2(newX, newY)/(Math.PI/180);
} else {
newAngle = 0;
}
return newAngle;
}
public static function findDistance(startPosition : Point, targetPosition : Point) : Number
{
var distance : Number = Math.round(Math.sqrt(((startPosition.x - targetPosition.x) * (startPosition.x - targetPosition.x)) + (startPosition.y - targetPosition.y) * (startPosition.y - targetPosition.y)));
return distance;
}
// This function is for converting wierd rotation values (like -58) to degrees.
public static function convertRotationValueToDegress(rotation : Number) : Number
{
var degrees : Number;
if(rotation < 0) {
degrees = 180 + (180 - Math.abs(rotation));
} else {
degrees = rotation;
}
return degrees;
}
}
}
