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/**
 * Created by cf232110 on 26.2.14.
 */
package model {
import flash.geom.Point;

public class OrbitModel {
    public var position:Point = new Point();

    private const GRAV_CONST:Number = 6.6742e-11;   // The "G" in the formula
    private const EARTH_MASS:Number = 5.975e24;     // The "m" in the formula
    private var r:Number = 6.37814e6;               // The "r" in the formula
    private var angle:Number = 0;
    private var grav_accel:Number = 0;
    private var body_pos_x:Number = 1.6e6;          // An X axis position of the body to be attracted
    private var body_pos_y:Number = 0;              // A Y axis position of the body to be attracted
    private var body_vel_x:Number = 0;            // Body velocity split into two components, X and Y
    private var body_vel_y:Number = 15.5e3;
    private var scale:Number = 10000;

    public function progress():Point {
        r = Math.sqrt(Math.pow(body_pos_x, 2) + Math.pow(body_pos_y, 2));
        grav_accel = GRAV_CONST * (EARTH_MASS / Math.pow(r, 2));
        angle = Math.atan2(body_pos_y, body_pos_x);
        body_vel_x += Math.cos(angle) * grav_accel;
        body_vel_y += Math.sin(angle) * grav_accel;
        body_pos_x -= body_vel_x;
        body_pos_y -= body_vel_y;

        position.x = body_pos_x / scale;
        position.y = body_pos_y / scale;

        return position;
    }
}
}