GetPixels man page on BSDi

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Tk_GetPixels(3)	      Tk Library Procedures	  Tk_GetPixels(3)

_________________________________________________________________

NAME
       Tk_GetPixels,  Tk_GetScreenMM  - translate between strings
       and screen units

SYNOPSIS
       #include <tk.h>

       int
       Tk_GetPixels(interp, tkwin, string, intPtr)

       int
       Tk_GetScreenMM(interp, tkwin, string, doublePtr)

ARGUMENTS
       Tcl_Interp   *interp    (in)	 Interpreter to	 use  for
					 error reporting.

       Tk_Window    tkwin      (in)	 Window	   whose   screen
					 geometry determines  the
					 conversion between abso-
					 lute units and pixels.

       char	    *string    (in)	 String that specifies	a
					 distance  on the screen.

       int	    *intPtr    (out)	 Pointer to  location  in
					 which to store converted
					 distance in pixels.

       double	    *doublePtr (out)	 Pointer to  location  in
					 which to store converted
					 distance in millimeters.
_________________________________________________________________

DESCRIPTION
       These  two  procedures take as argument a specification of
       distance on the screen (string)	and  compute  the  corre-
       sponding	 distance  either  in integer pixels or floating-
       point millimeters.  In either  case,  string  specifies	a
       screen distance as a floating-point number followed by one
       of the following characters that indicates units:

       <none> The number specifies a distance in pixels.

       c      The number specifies a distance in  centimeters  on
	      the screen.

       i      The  number  specifies  a distance in inches on the
	      screen.

       m      The number specifies a distance in  millimeters  on

Tk								1

Tk_GetPixels(3)	      Tk Library Procedures	  Tk_GetPixels(3)

	      the screen.

       p      The number specifies a distance in printer's points
	      (1/72 inch) on the screen.

       Tk_GetPixels converts string to the nearest even number of
       pixels  and  stores that value at *intPtr.  Tk_GetScreenMM
       converts string to millimeters and stores the  double-pre-
       cision floating-point result at *doublePtr.

       Both  procedures return TCL_OK under normal circumstances.
       If an error occurs (e.g. string contains a number followed
       by  a  character	 that  isn't  one of the ones above) then
       TCL_ERROR is returned and an  error  message  is	 left  in
       interp->result.

KEYWORDS
       centimeters, convert, inches, millimeters, pixels, points,
       screen units

Tk								2

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