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    Types: TextFile
    Names: »XrRectangle.3x«

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TextFile

.TH XRRECTANGLE 3X "Xrlib Version 10"
.SH NAME
XrSetRect, XrSetPtRect, XrCopyRect, XrOffsetRect, XrInsetRect, XrSectRect,
XrUnionRect, XrPtInRect, XrPt2Rect, XrEqualRect - 
calculations with rectangles.
.SH SYNOPSIS
#include <X/Xlib.h>
.br
#include <Xr/Xrlib.h>
.br
.PP 
.B XrSetRect (rect, x, y, width, height)
.br
RECTANGLE * rect;
.br
INT16 x;
.br
INT16 y;
.br
INT16 width;
.br
INT16 height;
.br
.sp 1
.B XrSetPtRect (rect, topLeft, botRight)
.br
RECTANGLE * rect;
.br
POINT * topLeft;
.br
POINT * botRight;
.br
.sp 1
.B XrCopyRect (srcRect, dstRect)
.br
RECTANGLE * srcRect;
.br
RECTANGLE * dstRect;
.br
.sp 1
.B XrOffsetRect (rect, dx, dy)
.br
RECTANGLE * rect;
.br
INT16 dx;
.br
INT16 dy;
.br
.sp 1
.B XrInsetRect (rect, dx, dy)
.br
RECTANGLE * rect;
.br
INT16 dx;
.br
INT16 dy;
.br
.sp 1
.B XrSectRect (srcRectA, srcRectB, dstRect)
.br
RECTANGLE * srcRectA;
.br
RECTANGLE * srcRectB;
.br
RECTANGLE * dstRect;
.br
.sp 1
.B XrUnionRect (srcRectA, srcRectB, dstRect)
.br
RECTANGLE * srcRectA;
.br
RECTANGLE * srcRectB;
.br
RECTANGLE * dstRect;
.br
.sp 1
.B XrPtInRect (pt, rect)
.br
POINT * pt;
.br
RECTANGLE * rect;
.br
.sp 1
.B XrPt2Rect (ptA, ptB, dstRect)
.br
POINT * ptA;
.br
POINT * ptB;
.br
RECTANGLE * dstRect;
.br
.sp 1
.B XrEqualRect (rectA, rectB)
.br
RECTANGLE * rectA;
.br
RECTANGLE * rectB;
.br
.sp 1
.B XrEmptyRect (rect);
.br
RECTANGLE * rect;
.br
.sp 1
.SH DESCRIPTION
.IP XrSetRect
Assign the four members of a rectangle.  The result is
a rectangle with values of
.I x, y, width, height.
.IP XrSetPtRect
Assign the two boundary points to the rectangle.  The result is a 
rectangle with the 
.I x
and
.I y
fields set to the fields of the
.I topLeft,
parameter and the
.I width
and
.I height
fields set to the difference of the 
.I topLeft
and
.I botRight
point parameters.
.IP XrCopyRect
Assign the coordinates of the source rectangle 
.I srcRect
into the
destination rectangle
.I dstRect.
.IP XrOffsetRect
Move the rectangle 
.I rect
by adding
.I dx
to each horizontal coordinate and 
.I dy
to each vertical coordinate.
.IP XrInsetRect
Shrink or expand the rectangle
.I rect.
The left and right sides are moved in by the amount specified by
.I dx;
the top and bottom are moved towards the center
by the amount specified by
.I dy.
If the resulting width or height becomes 
less than 1, the rectangle is set to the empty rectangle (0, 0, 0, 0).
.IP XrSectRect
Calculate the rectangle that is the intersection of the two source 
rectangles
.I srcRectA
and
.I srcRectB,
place the result into the rectangle
.I dstRect
and return
.B TRUE
if they intersect or
.B FALSE
if they do not.
.IP XrUnionRect
Calculate the smallest rectangle which encloses both input rectangles
and return the resulting rectangle in
.I dstRect.
.IP XrPtInRect
Determine whether the point is in the rectangle.  Return
.B TRUE
if it is and 
.B FALSE
if it isn't.
.IP XrPt2Rect
Return the smallest rectangle which encloses the two input points.
.IP XrEqualRect
Compare the two rectangles and return 
.B TRUE
if they are equal or 
.B FALSE
if not.
.IP XrEmptyRect
Return 
.B TRUE
if the given rectangle is an empty rectangle or 
.B FALSE
if not.  A rectangle is considered empty if the width or height fields of the
rectangle are less than or equal to 0.