NAME

SYNOPSIS

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.
}

DESCRIPTION

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.

KEYWORDS

Table of Contents

• NAME
• SYNOPSIS
• ARGUMENTS
• DESCRIPTION
• KEYWORDS

Web www.fiveanddime.net