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#include <Xw_Extension.h>
/* ifdef then trace on */
#ifdef TRACE
#define TRACE_GET_SCREEN_PIXELCOORD
#endif
/*
XW_STATUS Xw_get_screen_pixelcoord (adisplay,px,py,sx,sy):
XW_EXT_DISPLAY *adisplay
int px,py Screen Coordinates defined in Pixels
float *sx,*sy Returns Screen Coordinates defined in [0,1] Space
Get screen coordinate from Pixel Space to [0,1] Space
returns XW_ERROR if Pixel Coordinate is outside the screen
or the if Extended Window address is not defined
returns XW_SUCCESS if successful
*/
#ifdef XW_PROTOTYPE
XW_STATUS Xw_get_screen_pixelcoord(void *adisplay,int px,int py,float *sx,float *sy)
#else
XW_STATUS Xw_get_screen_pixelcoord(adisplay,px,py,sx,sy)
void *adisplay;
int px,py ;
float *sx,*sy ;
#endif /*XW_PROTOTYPE*/
{
XW_EXT_DISPLAY *pdisplay = (XW_EXT_DISPLAY*)adisplay;
int displaywidth ;
int displayheight ;
if( !Xw_isdefine_display(pdisplay) ) {
/*ERROR*Bad EXT_DISPLAY Address*/
Xw_set_error(96,"Xw_get_screen_pixelcoord",pdisplay) ;
return (XW_ERROR) ;
}
displaywidth = WidthOfScreen(_DSCREEN) ;
displayheight = HeightOfScreen(_DSCREEN) ;
*sx = (float)px/(float)displaywidth ;
*sy = 1. - (float)py/(float)displayheight ;
if( px < 0 || px >= displaywidth || py < 0 || py >= displayheight )
return (XW_ERROR);
#ifdef TRACE_GET_SCREEN_PIXELCOORD
if( Xw_get_trace() )
printf (" Xw_get_screen_pixelcoord(%lx,%d,%d,%f,%f)\n",(long ) pdisplay,px,py,*sx,*sy) ;
#endif
return (XW_SUCCESS);
}
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