man/man3/GetPixels.3 - toolchains/skids - Git at Google

 '\"
 '\" Copyright (c) 1990 The Regents of the University of California.
 '\" Copyright (c) 1994-1998 Sun Microsystems, Inc.
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 '\" RCS: @(#) $Id: GetPixels.3,v 1.4 2002/01/25 21:09:36 dgp Exp $
 '\"
 '\" The definitions below are for supplemental macros used in Tcl/Tk
 '\" manual entries.
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 '\" .AP type name in/out ?indent?
 '\"	Start paragraph describing an argument to a library procedure.
 '\"	type is type of argument (int, etc.), in/out is either "in", "out",
 '\"	or "in/out" to describe whether procedure reads or modifies arg,
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 '\" .OP cmdName dbName dbClass
 '\"	Start of description of a specific option.  cmdName gives the
 '\"	option's name as specified in the class command, dbName gives
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 '\"	the option's class in the option database.
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 '\"	# Set up traps and other miscellaneous stuff for Tcl/Tk man pages.
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 .ie !"\\$4"" .TP \\$4
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 .AS Tcl_Interp Tcl_CreateInterp in/out
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 See the \\fBoptions\\fR manual entry for details on the standard options.
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 .TH Tk_GetPixelsFromObj 3 8.1 Tk "Tk Library Procedures"
 .BS
 .SH NAME
 Tk_GetPixelsFromObj, Tk_GetPixels, Tk_GetMMFromObj, Tk_GetScreenMM \- translate between strings and screen units
 .SH SYNOPSIS
 .nf
 \fB#include <tk.h>\fR
 .sp
 .VS 8.1
 int
 \fBTk_GetPixelsFromObj(\fIinterp, tkwin, objPtr, intPtr\fB)\fR
 .VE
 .sp
 int
 \fBTk_GetPixels(\fIinterp, tkwin, string, intPtr\fB)\fR
 .sp
 .VS 8.1
 int
 \fBTk_GetMMFromObj(\fIinterp, tkwin, objPtr, doublePtr\fB)\fR
 .VE
 .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.
 .VS 8.1 br
 .AP Tcl_Obj *objPtr in/out
 String value specifies a distance on the screen;
 internal rep will be modified to cache converted distance.
 .AP "CONST char" *string in
 Same as \fIobjPtr\fR except specification of distance is passed as
 a string.
 .VE
 .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 procedures take as argument a specification of distance on
 .VS 8.1
 the screen (\fIobjPtr\fR or \fIstring\fR) and compute the
 .VE
 corresponding distance either in integer pixels or floating-point millimeters.
 In either case,
 .VS 8.1
 \fIobjPtr\fR or \fIstring\fR
 .VE
 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
 .VS 8.1
 \fBTk_GetPixelsFromObj\fR converts the value of \fIobjPtr\fR to the
 nearest even number of pixels and stores that value at \fI*intPtr\fR.
 It returns \fBTCL_OK\fR under normal circumstances.
 If an error occurs (e.g. \fIobjPtr\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\fR's result if \fIinterp\fR isn't NULL.
 \fBTk_GetPixelsFromObj\fR caches information about the return
 value in \fIobjPtr\fR, which speeds up future calls to
 \fBTk_GetPixelsFromObj\fR with the same \fIobjPtr\fR.
 .PP
 \fBTk_GetPixels\fR is identical to \fBTk_GetPixelsFromObj\fR except
 that the screen distance is specified with a string instead
 of an object.  This prevents \fBTk_GetPixels\fR from caching the
 return value, so \fBTk_GetAnchor\fR is less efficient than
 \fBTk_GetPixelsFromObj\fR.
 .PP
 \fBTk_GetMMFromObj\fR and \fBTk_GetScreenMM\fR are similar to
 \fBTk_GetPixelsFromObj\fR and \fBTk_GetPixels\fR (respectively) except
 that they convert the screen distance to millimeters and
 store a double-precision floating-point result at \fI*doublePtr\fR.
 .VE

 .SH KEYWORDS
 centimeters, convert, inches, millimeters, pixels, points, screen units
	'\"
	'\" Copyright (c) 1990 The Regents of the University of California.
	'\" Copyright (c) 1994-1998 Sun Microsystems, Inc.
	'\"
	'\" See the file "license.terms" for information on usage and redistribution
	'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
	'\"
	'\" RCS: @(#) $Id: GetPixels.3,v 1.4 2002/01/25 21:09:36 dgp Exp $
	'\"
	'\" The definitions below are for supplemental macros used in Tcl/Tk
	'\" manual entries.
	'\"
	'\" .AP type name in/out ?indent?
	'\" Start paragraph describing an argument to a library procedure.
	'\" type is type of argument (int, etc.), in/out is either "in", "out",
	'\" or "in/out" to describe whether procedure reads or modifies arg,
	'\" and indent is equivalent to second arg of .IP (shouldn't ever be
	'\" needed; use .AS below instead)
	'\"
	'\" .AS ?type? ?name?
	'\" Give maximum sizes of arguments for setting tab stops. Type and
	'\" name are examples of largest possible arguments that will be passed
	'\" to .AP later. If args are omitted, default tab stops are used.
	'\"
	'\" .BS
	'\" Start box enclosure. From here until next .BE, everything will be
	'\" enclosed in one large box.
	'\"
	'\" .BE
	'\" End of box enclosure.
	'\"
	'\" .CS
	'\" Begin code excerpt.
	'\"
	'\" .CE
	'\" End code excerpt.
	'\"
	'\" .VS ?version? ?br?
	'\" Begin vertical sidebar, for use in marking newly-changed parts
	'\" of man pages. The first argument is ignored and used for recording
	'\" the version when the .VS was added, so that the sidebars can be
	'\" found and removed when they reach a certain age. If another argument
	'\" is present, then a line break is forced before starting the sidebar.
	'\"
	'\" .VE
	'\" End of vertical sidebar.
	'\"
	'\" .DS
	'\" Begin an indented unfilled display.
	'\"
	'\" .DE
	'\" End of indented unfilled display.
	'\"
	'\" .SO
	'\" Start of list of standard options for a Tk widget. The
	'\" options follow on successive lines, in four columns separated
	'\" by tabs.
	'\"
	'\" .SE
	'\" End of list of standard options for a Tk widget.
	'\"
	'\" .OP cmdName dbName dbClass
	'\" Start of description of a specific option. cmdName gives the
	'\" option's name as specified in the class command, dbName gives
	'\" the option's name in the option database, and dbClass gives
	'\" the option's class in the option database.
	'\"
	'\" .UL arg1 arg2
	'\" Print arg1 underlined, then print arg2 normally.
	'\"
	'\" RCS: @(#) $Id: man.macros,v 1.4 2000/08/25 06:18:32 ericm Exp $
	'\"
	'\" # Set up traps and other miscellaneous stuff for Tcl/Tk man pages.
	.if t .wh -1.3i ^B
	.nr ^l \n(.l
	.ad b
	'\" # Start an argument description
	.de AP
	.ie !"\\$4"" .TP \\$4
	.el \{\
	. ie !"\\$2"" .TP \\n()Cu
	. el .TP 15
	.\}
	.ta \\n()Au \\n()Bu
	.ie !"\\$3"" \{\
	\&\\$1 \\fI\\$2\\fP (\\$3)
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	.\"
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	.nr )C \\n()Bu+\\w'(in/out)'u+2n
	..
	.AS Tcl_Interp Tcl_CreateInterp in/out
	'\" # BS - start boxed text
	'\" # ^y = starting y location
	'\" # ^b = 1
	.de BS
	.br
	.mk ^y
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	.\" Draw four-sided box normally, but don't draw top of
	.\" box if the box started on an earlier page.
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	\h'-1.5n'\L'\|\\n(^yu-1v'\l'\\n(^lu+3n\(ul'\L'\\n(^tu+1v-\\n(^yu'\l'\|0u-1.5n\(ul'
	.\}
	.el \}\
	\h'-1.5n'\L'\|\\n(^yu-1v'\h'\\n(^lu+3n'\L'\\n(^tu+1v-\\n(^yu'\l'\|0u-1.5n\(ul'
	.\}
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	.br
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	.sp -1
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	.\" draw two sides but no top otherwise.
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	.el \h'-1.5n'\L'\|\\n(^yu-1v'\h'\\n(^lu+3n'\L'\\n(^tu+1v-\\n(^yu'\h'\|0u'\c
	.\}
	.if \\n(^v \{\
	.nr ^x \\n(^tu+1v-\\n(^Yu
	\kx\h'-\\nxu'\h'\|\\n(^lu+3n'\ky\L'-\\n(^xu'\v'\\n(^xu'\h'\|0u'\c
	.\}
	.bp
	'fi
	.ev
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	.mk ^y
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	.RE
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	..
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	.de SO
	.SH "STANDARD OPTIONS"
	.LP
	.nf
	.ta 5.5c 11c
	.ft B
	..
	'\" # SE - end of list of standard options
	.de SE
	.fi
	.ft R
	.LP
	See the \\fBoptions\\fR manual entry for details on the standard options.
	..
	'\" # OP - start of full description for a single option
	.de OP
	.LP
	.nf
	.ta 4c
	Command-Line Name: \\fB\\$1\\fR
	Database Name: \\fB\\$2\\fR
	Database Class: \\fB\\$3\\fR
	.fi
	.IP
	..
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	.de CS
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	..
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	..
	.de UL
	\\$1\l'\|0\(ul'\\$2
	..
	.TH Tk_GetPixelsFromObj 3 8.1 Tk "Tk Library Procedures"
	.BS
	.SH NAME
	Tk_GetPixelsFromObj, Tk_GetPixels, Tk_GetMMFromObj, Tk_GetScreenMM \- translate between strings and screen units
	.SH SYNOPSIS
	.nf
	\fB#include <tk.h>\fR
	.sp
	.VS 8.1
	int
	\fBTk_GetPixelsFromObj(\fIinterp, tkwin, objPtr, intPtr\fB)\fR
	.VE
	.sp
	int
	\fBTk_GetPixels(\fIinterp, tkwin, string, intPtr\fB)\fR
	.sp
	.VS 8.1
	int
	\fBTk_GetMMFromObj(\fIinterp, tkwin, objPtr, doublePtr\fB)\fR
	.VE
	.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.
	.VS 8.1 br
	.AP Tcl_Obj *objPtr in/out
	String value specifies a distance on the screen;
	internal rep will be modified to cache converted distance.
	.AP "CONST char" *string in
	Same as \fIobjPtr\fR except specification of distance is passed as
	a string.
	.VE
	.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 procedures take as argument a specification of distance on
	.VS 8.1
	the screen (\fIobjPtr\fR or \fIstring\fR) and compute the
	.VE
	corresponding distance either in integer pixels or floating-point millimeters.
	In either case,
	.VS 8.1
	\fIobjPtr\fR or \fIstring\fR
	.VE
	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
	.VS 8.1
	\fBTk_GetPixelsFromObj\fR converts the value of \fIobjPtr\fR to the
	nearest even number of pixels and stores that value at \fI*intPtr\fR.
	It returns \fBTCL_OK\fR under normal circumstances.
	If an error occurs (e.g. \fIobjPtr\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\fR's result if \fIinterp\fR isn't NULL.
	\fBTk_GetPixelsFromObj\fR caches information about the return
	value in \fIobjPtr\fR, which speeds up future calls to
	\fBTk_GetPixelsFromObj\fR with the same \fIobjPtr\fR.
	.PP
	\fBTk_GetPixels\fR is identical to \fBTk_GetPixelsFromObj\fR except
	that the screen distance is specified with a string instead
	of an object. This prevents \fBTk_GetPixels\fR from caching the
	return value, so \fBTk_GetAnchor\fR is less efficient than
	\fBTk_GetPixelsFromObj\fR.
	.PP
	\fBTk_GetMMFromObj\fR and \fBTk_GetScreenMM\fR are similar to
	\fBTk_GetPixelsFromObj\fR and \fBTk_GetPixels\fR (respectively) except
	that they convert the screen distance to millimeters and
	store a double-precision floating-point result at \fI*doublePtr\fR.
	.VE

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