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GetPixels.3
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1995-07-21
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'\"
'\" Copyright (c) 1990 The Regents of the University of California.
'\" All rights reserved.
'\"
'\" Permission is hereby granted, without written agreement and without
'\" license or royalty fees, to use, copy, modify, and distribute this
'\" documentation for any purpose, provided that the above copyright
'\" notice and the following two paragraphs appear in all copies.
'\"
'\" IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY
'\" FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
'\" ARISING OUT OF THE USE OF THIS DOCUMENTATION, EVEN IF THE UNIVERSITY OF
'\" CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
'\"
'\" THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
'\" INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
'\" AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
'\" ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATION TO
'\" PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
'\"
'\" $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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.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