Tk_GetPixels

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 absolute
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.

These two procedures take as argument a specification of distance on
the screen (string) and compute the corresponding 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 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-precision 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.