position.java

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/**
 * Stores the position of an object in the simulation.
 * 
 * @author James M. Clarke  
 * @version 02/03/2007
 */

public class Position
{
    private float x;
    private float y;
    
     /**
	 * Constructor for Position objects
	 * @param  xcoord  the x coordinate of the object being simulated
	 * @param  ycoord  the y coordinate of the object being simulated
	 */
    public Position(float xcoord, float ycoord)
    {
        x = xcoord;
        y = ycoord;
    }    
    
     /**
	 * Accessor method for the x coordinate
	 * 
	 * @return     x coordinate of this position
	 */
    public float getX()
    { return x; }

     /**
	 * Accessor method for the y coordinate
	 * 
	 * @return     y coordinate of this position
	 */    
    public float getY()
    { return y; }
   
     /**
	 * Finds the angle between the line drawn between two points and the "y" axis.
	 * 
	 * @param  p1   the <code>Position</code> of the start of the line
	 * @param  p2   the <code>Position</code> of the end of the line
	 * @return      the angle in radians clockwise from the y-axis to the line
	 */     
    public static float angleToNorth(Position p1, Position p2)
        {
            //Find the angle (clockwise) between North and the line starting at (xpos1,ypos1) and ending at (xpos2, ypos2)
            double temp = Math.atan( ((double)   (p2.getY()-p1.getY()) / ((p2.getX()-p1.getX())  ) ) );  
            if (p2.getX() < p1.getX()) { temp += (Math.PI); }
            temp += Math.PI/2;
            return Angle.normal( (float) temp);
        }

     /**
	 * Finds the distance between two points
	 * 
	 * @param  p1   the <code>Position</code> of one of the points
	 * @param  p2   the <code>Position</code> of the other point
	 * @return      the distance between the points
	 */        
    public static float distance(Position p1, Position p2)
        {
            //Get the distance between the two points (xpos1, ypos1) and (xpos2, ypos2)
            float xtemp = (float) Math.pow(p2.getX()-p1.getX(),2);
            float ytemp = (float) Math.pow(p2.getY()-p1.getY(),2);
            float temp = xtemp + ytemp;
            temp = (float) Math.sqrt(temp);
            return temp;
        }

     /**
	 * Calculates a new point that is at a particular distance and heading from a starting point
	 * 
	 * @param  pos  the <code>Position</code> to start at
	 * @param  angle   the angle to travel, in radians clockwise from the y-axis
	 * @param  distance   the distance to travel
	 * @return the new <code>Position</code>
	 */                
    public static Position atAngleDistance(Position pos, float  angle, float distance)
        {
            //Get the x coordinate of a point that is "distance" in the direction "angle" from a point (xpos, ypos)
            return new Position( (distance * ((float) Math.cos((double) angle + (Math.PI/2) ))) +  pos.getX(), (distance * ((float) Math.sin((double) angle + (Math.PI/2)))) +  pos.getY() );   
        }        

}