#ifndef PIX_H
#define PIX_H
/*******************************************************************************
* E.S.O. - VLT project
*
* "@(#) $Id: AP_pixel.h,v 2.43 2004/06/17 23:04:26 vltsccm Exp $"
*
* who       when      what
* --------  --------  ----------------------------------------------
* hummel  13/03/98  created
*/

/************************************************************************
 *
 *----------------------------------------------------------------------
 */

#ifndef __cplusplus
#error This is a C++ include file and cannot be used from plain C
#endif

//----------------
class AP_pixel  {
//----------------

public:
                static float ra2deg;
                static float deg2ra;

float py_on_line(float px,float py,float g1x,float g1y,float g2x,float g2y);
      // returns the  y-distance between p and the line given by g1 g2

float px_on_line(float px,float py,float g1x,float g1y,float g2x,float g2y);
      // returns the  x-distance between p and the line given by g1 g2

float pr_on_line(float px,float py,float g1x,float g1y,float g2x,float g2y);
      // returns the  distance between p and the line given by g1 g2

int p_in_area(int max, float px, float py, float *x, float *y);
    // tests if point inside a geometric figure like a 
    // rectangle, max is the last accessible index of arrays x and y
    // x,y[0] is test target; x[1..4],y[1..4]  are ractangle points
    // in drawing order !!!

void rot(float *px, float *py, float cx, float cy, float rot_ang);
     // rotates (p)oint around (c)enter by an amount of rot degrees
     // and overwrites (p)oint                  y^ /
     // mathematical orientation (anti-clock)    |/ rot
     //                                          +--->x

void test();
     // test the methods given above


};


#endif /*!_H*/