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- '\" $Header: /user6/ouster/wish/man/RCS/GetPixels.3,v 1.3 93/04/01 09:41:36 ouster Exp $ SPRITE (Berkeley)
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- .so man.macros
- .HS Tk_GetPixels tkc
- .BS
- .SH NAME
- .VS
- Tk_GetPixels, Tk_GetScreenMM \- translate between strings and screen units
- .SH SYNOPSIS
- .nf
- \fB#include <tk.h>\fR
- .sp
- int
- \fBTk_GetPixels(\fIinterp, tkwin, string, intPtr\fB)\fR
- .sp
- int
- \fBTk_GetScreenMM(\fIinterp, tkwin, string, doublePtr\fB)\fR
- .SH ARGUMENTS
- .AS "Tcl_Interp" *joinPtr
- .AP Tcl_Interp *interp in
- Interpreter to use for error reporting.
- .AP Tk_Window tkwin in
- Window whose screen geometry determines the conversion between absolute
- units and pixels.
- .AP char *string in
- String that specifies a distance on the screen.
- .AP int *intPtr out
- Pointer to location in which to store converted distance in pixels.
- .AP double *doublePtr out
- Pointer to location in which to store converted distance in millimeters.
- .BE
-
- .SH DESCRIPTION
- .PP
- These two procedures take as argument a specification of distance on
- the screen (\fIstring\fR) and compute the corresponding distance
- either in integer pixels or floating-point millimeters.
- In either case, \fIstring\fR specifies a screen distance as a
- floating-point number followed by one of the following characters
- that indicates units:
- .TP
- <none>
- The number specifies a distance in pixels.
- .TP
- \fBc\fR
- The number specifies a distance in centimeters on the screen.
- .TP
- \fBi\fR
- The number specifies a distance in inches on the screen.
- .TP
- \fBm\fR
- The number specifies a distance in millimeters on the screen.
- .TP
- \fBp\fR
- The number specifies a distance in printer's points (1/72 inch)
- on the screen.
- .PP
- \fBTk_GetPixels\fR converts \fIstring\fR to the nearest even
- number of pixels and stores that value at \fI*intPtr\fR.
- \fBTk_GetScreenMM\fR converts \fIstring\fR to millimeters and
- stores the double-precision floating-point result at \fI*doublePtr\fR.
- .PP
- Both procedures return \fBTCL_OK\fR under normal circumstances.
- If an error occurs (e.g. \fIstring\fR contains a number followed
- by a character that isn't one of the ones above) then
- \fBTCL_ERROR\fR is returned and an error message is left
- in \fIinterp->result\fR.
-
- .SH KEYWORDS
- centimeters, convert, inches, millimeters, pixels, points, screen units
- .VE
-