/*

	TUIO Java backend - part of the reacTIVision project

	http://reactivision.sourceforge.net/

	Copyright (c) 2005-2009 Martin Kaltenbrunner <mkalten@iua.upf.edu>

    This program is free software; you can redistribute it and/or modify

    it under the terms of the GNU General Public License as published by

    the Free Software Foundation; either version 2 of the License, or

    (at your option) any later version.

    This program is distributed in the hope that it will be useful,

    but WITHOUT ANY WARRANTY; without even the implied warranty of

    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License

    along with this program; if not, write to the Free Software

    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

*/

package TUIO;

/**

 * The TuioPoint class on the one hand is a simple container and utility class to handle TUIO positions in general, 

 * on the other hand the TuioPoint is the base class for the TuioCursor and TuioObject classes.

 *

 * @author Martin Kaltenbrunner

 * @version 1.4

 */ 

public class TuioPoint {

	/**

	 * X coordinate, representated as a floating point value in a range of 0..1  

	 */

	protected float xpos;

	/**

	 * Y coordinate, representated as a floating point value in a range of 0..1  

	 */

	protected float ypos;

	/**

	 * The time stamp of the last update represented as TuioTime (time since session start)

	 */

	protected TuioTime currentTime;

	/**

	 * The creation time of this TuioPoint represented as TuioTime (time since session start)

	 */

	protected TuioTime startTime;

	/**

	 * The default constructor takes no arguments and sets   

	 * its coordinate attributes to zero and its time stamp to the current session time.

	 */

	public TuioPoint() {

		xpos = 0.0f;

		ypos = 0.0f;

		currentTime = TuioTime.getSessionTime();

		startTime = new TuioTime(currentTime);

	}

	/**

	 * This constructor takes two floating point coordinate arguments and sets   

	 * its coordinate attributes to these values and its time stamp to the current session time.

	 *

	 * @param	xp	the X coordinate to assign

	 * @param	yp	the Y coordinate to assign

	 */

	public TuioPoint(float xp, float yp) {

		xpos = xp;

		ypos = yp;

		currentTime = TuioTime.getSessionTime();

		startTime = new TuioTime(currentTime);

	}

	/**

	 * This constructor takes a TuioPoint argument and sets its coordinate attributes 

	 * to the coordinates of the provided TuioPoint and its time stamp to the current session time.

	 *

	 * @param	tpoint	the TuioPoint to assign

	 */

	public TuioPoint(TuioPoint tpoint) {

		xpos = tpoint.getX();

		ypos = tpoint.getY();

		currentTime = TuioTime.getSessionTime();

		startTime = new TuioTime(currentTime);

	}

	/**

	 * This constructor takes a TuioTime object and two floating point coordinate arguments and sets   

	 * its coordinate attributes to these values and its time stamp to the provided TUIO time object.

	 *

	 * @param	ttime	the TuioTime to assign

	 * @param	xp	the X coordinate to assign

	 * @param	yp	the Y coordinate to assign

	 */

	public TuioPoint(TuioTime ttime, float xp, float yp) {

		xpos = xp;

		ypos = yp;

		currentTime = new TuioTime(ttime);

		startTime = new TuioTime(currentTime);

	}

	/**

	 * Takes a TuioPoint argument and updates its coordinate attributes 

	 * to the coordinates of the provided TuioPoint and leaves its time stamp unchanged.

	 *

	 * @param	tpoint	the TuioPoint to assign

	 */

	public void update(TuioPoint tpoint) {

		xpos = tpoint.getX();

		ypos = tpoint.getY();

	}

	/**

	 * Takes two floating point coordinate arguments and updates its coordinate attributes 

	 * to the coordinates of the provided TuioPoint and leaves its time stamp unchanged.

	 *

	 * @param	xp	the X coordinate to assign

	 * @param	yp	the Y coordinate to assign

	 */

	public void update(float xp, float yp) {

		xpos = xp;

		ypos = yp;

	}

	/**

	 * Takes a TuioTime object and two floating point coordinate arguments and updates its coordinate attributes 

	 * to the coordinates of the provided TuioPoint and its time stamp to the provided TUIO time object.

	 *

	 * @param	ttime	the TuioTime to assign

	 * @param	xp	the X coordinate to assign

	 * @param	yp	the Y coordinate to assign

	 */

	public void update(TuioTime ttime, float xp, float yp) {

		xpos = xp;

		ypos = yp;

		currentTime = new TuioTime(ttime);

	}

	/**

	 * Returns the X coordinate of this TuioPoint. 

	 * @return	the X coordinate of this TuioPoint

	 */

	public float getX() {

		return xpos;

	}

	/**

	 * Returns the Y coordinate of this TuioPoint. 

	 * @return	the Y coordinate of this TuioPoint

	 */

	public float getY() {

		return ypos;

	}

	/**

	 * Returns the distance to the provided coordinates 

	 *

	 * @param	xp	the X coordinate of the distant point

	 * @param	yp	the Y coordinate of the distant point

	 * @return	the distance to the provided coordinates

	 */

	public float getDistance(float xp, float yp) {

		float dx = xpos-xp;

		float dy = ypos-yp;

		return (float)Math.sqrt(dx*dx+dy*dy);

	}

	/**

	 * Returns the distance to the provided TuioPoint 

	 *

	 * @param	tpoint	the distant TuioPoint

	 * @return	the distance to the provided TuioPoint

	 */

	public float getDistance(TuioPoint tpoint) {

		return getDistance(tpoint.getX(),tpoint.getY());

	}

	/**

	 * Returns the angle to the provided coordinates 

	 *

	 * @param	xp	the X coordinate of the distant point

	 * @param	yp	the Y coordinate of the distant point

	 * @return	the angle to the provided coordinates

	 */

	public float getAngle(float xp, float yp) {

		float side = xpos-xp;

		float height = ypos-yp;

		float distance = getDistance(xp,yp);

		float angle = (float)(Math.asin(side/distance)+Math.PI/2);

		if (height<0) angle = 2.0f*(float)Math.PI-angle;

		return angle;

	}

	/**

	 * Returns the angle to the provided TuioPoint 

	 *

	 * @param	tpoint	the distant TuioPoint

	 * @return	the angle to the provided TuioPoint

	 */

	public float getAngle(TuioPoint tpoint) {						

		return getAngle(tpoint.getX(),tpoint.getY());

	}

	/**

	 * Returns the angle in degrees to the provided coordinates 

	 *

	 * @param	xp	the X coordinate of the distant point

	 * @param	yp	the Y coordinate of the distant point

	 * @return	the angle in degrees to the provided TuioPoint

	 */

	public float getAngleDegrees(float xp, float yp) {		

		return (getAngle(xp,yp)/(float)Math.PI)*180.0f;

	}

	/**

	 * Returns the angle in degrees to the provided TuioPoint 

	 *

	 * @param	tpoint	the distant TuioPoint

	 * @return	the angle in degrees to the provided TuioPoint

	 */

	public float getAngleDegrees(TuioPoint tpoint) {		

		return (getAngle(tpoint)/(float)Math.PI)*180.0f;

	}

	/**

	 * Returns the X coordinate in pixels relative to the provided screen width. 

	 *

	 * @param	width	the screen width

	 * @return	the X coordinate of this TuioPoint in pixels relative to the provided screen width

	 */

	public int getScreenX(int width) {

		return (int)Math.round(xpos*width);

	}

	/**

	 * Returns the Y coordinate in pixels relative to the provided screen height. 

	 *

	 * @param	height	the screen height

	 * @return	the Y coordinate of this TuioPoint in pixels relative to the provided screen height

	 */

	public int getScreenY(int height) {

		return (int)Math.round(ypos*height);

	}

	/**

	 * Returns the time stamp of this TuioPoint as TuioTime. 

	 *

	 * @return	the time stamp of this TuioPoint as TuioTime

	 */

	public TuioTime getTuioTime() {

		return new TuioTime(currentTime);

	}

	/**

	 * Returns the start time of this TuioPoint as TuioTime. 

	 *

	 * @return	the start time of this TuioPoint as TuioTime

	 */

	public TuioTime getStartTime() {

		return new TuioTime(startTime);

	}

}