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.TH "XmSetColorCalculation" 3
.SH "NAME"
\fBXmSetColorCalculation\fP \(em A function to set the procedure used for default color calculation
"XmSetColorCalculation"
"Color functions" "XmSetColorCalculation"
.SH "SYNOPSIS"
.PP
.nf
#include <Xm/Xm\&.h>
\fBXmColorProc \fBXmSetColorCalculation\fP\fR(
\fBXmColorProc \fBcolor_proc\fR\fR);
.fi
.SH "DESCRIPTION"
.PP
\fBXmSetColorCalculation\fP sets the procedure to calculate
default colors\&.
This procedure is used to calculate the foreground, top shadow, bottom
shadow, and select colors on the basis of a given background color\&.
If called with an argument of NULL, it restores the default procedure
used to calculate colors\&.
.IP "\fIcolor_proc\fP" 10
Specifies the procedure to use for color calculation\&.
.PP
Following is a description of the \fBXmColorProc\fR type used by
\fBXmSetColorCalculation\fP:
.PP
.nf
void (*\fIcolor_proc\fP) (\fIbackground_color, foreground_color, select_color, top_shadow_color,
bottom_shadow_color\fP)
        XColor  \fI*background_color\fP;
        XColor  \fI*foreground_color\fP;
        XColor  \fI*select_color\fP;
        XColor  \fI*top_shadow_color\fP;
        XColor  \fI*bottom_shadow_color\fP;
\fB\fR(\fBvoid\fR)
.fi
.PP
Specifies the procedure used to calculate default colors\&.
The procedure is passed a pointer to an \fBXColor\fP structure
representing the background color\&.
The \fIpixel\fP, \fIred\fP, \fIgreen\fP, and \fIblue\fP members of this
structure are filled in with values that are valid for the current
colormap\&.
.PP
The procedure is passed pointers to \fBXColor\fP structures representing
the foreground, select, top shadow, and bottom shadow colors to be
calculated\&.
The procedure calculates and fills in the \fIred\fP, \fIgreen\fP, and
\fIblue\fP members of these structures\&.
The procedure should not allocate color cells for any of these colors\&.
.IP "\fIbackground_color\fP" 10
Specifies the background color\&.
.IP "\fIforeground_color\fP" 10
Specifies the foreground color to be calculated\&.
.IP "\fIselect_color\fP" 10
Specifies the select color to be calculated\&.
.IP "\fItop_shadow_color\fP" 10
Specifies the top shadow color to be calculated\&.
.IP "\fIbottom_shadow_color\fP" 10
Specifies the bottom shadow color to be calculated\&.
.SH "RETURN"
.PP
Returns the color calculation procedure that was used at the time this
routine was called\&.
.SH "RELATED"
.PP
\fBXmChangeColor\fP(3),
\fBXmGetColors\fP(3), and
\fBXmGetColorCalculation\fP(3)\&.
.\" created by instant / docbook-to-man, Sun 22 Dec 1996, 20:30