rect.c File Reference

#include <user32.h>

Include dependency graph for rect.c:

Go to the source code of this file.

Functions
BOOL WINAPI	CopyRect (LPRECT lprcDst, CONST RECT *lprcSrc)
BOOL WINAPI	EqualRect (CONST RECT *lprc1, CONST RECT *lprc2)
BOOL WINAPI	InflateRect (LPRECT rect, int dx, int dy)
BOOL WINAPI	IntersectRect (LPRECT lprcDst, CONST RECT *lprcSrc1, CONST RECT *lprcSrc2)
BOOL WINAPI	IsRectEmpty (CONST RECT *lprc)
BOOL WINAPI	OffsetRect (LPRECT rect, int dx, int dy)
BOOL WINAPI	PtInRect (CONST RECT *lprc, POINT pt)
BOOL WINAPI	SetRect (LPRECT lprc, int xLeft, int yTop, int xRight, int yBottom)
BOOL WINAPI	SetRectEmpty (LPRECT lprc)
BOOL WINAPI	SubtractRect (LPRECT lprcDst, CONST RECT *lprcSrc1, CONST RECT *lprcSrc2)
BOOL WINAPI	UnionRect (LPRECT lprcDst, CONST RECT *lprcSrc1, CONST RECT *lprcSrc2)

Function Documentation

CopyRect()

BOOL WINAPI CopyRect	(	LPRECT	lprcDst,
		CONST RECT *	lprcSrc
	)

Definition at line 35 of file rect.c.

{
    if (lprcDst == NULL || lprcSrc == NULL)
        return FALSE;
 
    *lprcDst = *lprcSrc;
 
    return TRUE;
}

EqualRect()

BOOL WINAPI EqualRect	(	CONST RECT *	lprc1,
		CONST RECT *	lprc2
	)

Definition at line 52 of file rect.c.

{
    if (lprc1 == NULL || lprc2 == NULL)
        return FALSE;
 
    return (lprc1->left == lprc2->left) && (lprc1->top == lprc2->top) &&
           (lprc1->right == lprc2->right) && (lprc1->bottom == lprc2->bottom);
}

Referenced by SubtractRect().

InflateRect()

BOOL WINAPI InflateRect	(	LPRECT	rect,
		int	dx,
		int	dy
	)

Definition at line 68 of file rect.c.

{
    if (rect == NULL)
        return FALSE;
 
    rect->left -= dx;
    rect->top -= dy;
    rect->right += dx;
    rect->bottom += dy;
 
    return TRUE;
}

IntersectRect()

BOOL WINAPI IntersectRect	(	LPRECT	lprcDst,
		CONST RECT *	lprcSrc1,
		CONST RECT *	lprcSrc2
	)

Definition at line 89 of file rect.c.

{
    if (lprcDst == NULL || lprcSrc1 == NULL || lprcSrc2 == NULL)
        return FALSE;
 
    if (IsRectEmpty(lprcSrc1) || IsRectEmpty(lprcSrc2) ||
        lprcSrc1->left >= lprcSrc2->right ||
        lprcSrc2->left >= lprcSrc1->right ||
        lprcSrc1->top >= lprcSrc2->bottom ||
        lprcSrc2->top >= lprcSrc1->bottom)
    {
        SetRectEmpty(lprcDst);
        return FALSE;
    }
 
    lprcDst->left = max(lprcSrc1->left, lprcSrc2->left);
    lprcDst->right = min(lprcSrc1->right, lprcSrc2->right);
    lprcDst->top = max(lprcSrc1->top, lprcSrc2->top);
    lprcDst->bottom = min(lprcSrc1->bottom, lprcSrc2->bottom);
 
    return TRUE;
}

Referenced by SubtractRect().

IsRectEmpty()

BOOL WINAPI IsRectEmpty

(

CONST RECT *

lprc

)

Definition at line 120 of file rect.c.

{
    if (lprc == NULL)
        return TRUE;
 
    return ((lprc->left >= lprc->right) || (lprc->top >= lprc->bottom));
}

Referenced by IntersectRect(), and UnionRect().

OffsetRect()

BOOL WINAPI OffsetRect	(	LPRECT	rect,
		int	dx,
		int	dy
	)

Definition at line 134 of file rect.c.

{
    if (rect == NULL)
        return FALSE;
 
    rect->left += dx;
    rect->top += dy;
    rect->right += dx;
    rect->bottom += dy;
 
    return TRUE;
}

PtInRect()

BOOL WINAPI PtInRect	(	CONST RECT *	lprc,
		POINT	pt
	)

Definition at line 155 of file rect.c.

{
    if (lprc == NULL)
        return FALSE;
 
    return((pt.x >= lprc->left) && (pt.x < lprc->right) &&
           (pt.y >= lprc->top) && (pt.y < lprc->bottom));
}

SetRect()

BOOL WINAPI SetRect	(	LPRECT	lprc,
		int	xLeft,
		int	yTop,
		int	xRight,
		int	yBottom
	)

Definition at line 167 of file rect.c.

{
    if (lprc == NULL)
        return FALSE;
 
    lprc->left = xLeft;
    lprc->top = yTop;
    lprc->right = xRight;
    lprc->bottom = yBottom;
 
    return TRUE;
}

SetRectEmpty()

BOOL WINAPI SetRectEmpty

(

LPRECT

lprc

)

Definition at line 190 of file rect.c.

{
    if (lprc == NULL)
        return FALSE;
 
    lprc->left = lprc->right = lprc->top = lprc->bottom = 0;
 
    return TRUE;
}

Referenced by IntersectRect(), SubtractRect(), and UnionRect().

SubtractRect()

BOOL WINAPI SubtractRect	(	LPRECT	lprcDst,
		CONST RECT *	lprcSrc1,
		CONST RECT *	lprcSrc2
	)

Definition at line 206 of file rect.c.

{
    RECT tempRect;
 
    if (lprcDst == NULL || lprcSrc1 == NULL || lprcSrc2 == NULL)
        return FALSE;
 
    if (!IntersectRect(&tempRect, lprcSrc1, lprcSrc2))
    {
        *lprcDst = *lprcSrc1;
        return TRUE;
    }
 
    if (EqualRect(&tempRect, lprcSrc1))
    {
        SetRectEmpty(lprcDst);
        return FALSE;
    }
 
    *lprcDst = *lprcSrc1;
 
    if (lprcDst->top == tempRect.top && lprcDst->bottom == tempRect.bottom)
    {
        if (lprcDst->left == tempRect.left)
            lprcDst->left = tempRect.right;
        else if (lprcDst->right == tempRect.right)
            lprcDst->right = tempRect.left;
    }
    else if (lprcDst->left == tempRect.left && lprcDst->right == tempRect.right)
    {
        if (lprcDst->top == tempRect.top)
            lprcDst->top = tempRect.bottom;
        else if (lprcDst->bottom == tempRect.bottom)
            lprcDst->bottom = tempRect.top;
    }
 
    return TRUE;
}

UnionRect()

BOOL WINAPI UnionRect	(	LPRECT	lprcDst,
		CONST RECT *	lprcSrc1,
		CONST RECT *	lprcSrc2
	)

Definition at line 253 of file rect.c.

{
    if (lprcDst == NULL || lprcSrc1 == NULL || lprcSrc2 == NULL)
        return FALSE;
 
    if (IsRectEmpty(lprcSrc1))
    {
        if (IsRectEmpty(lprcSrc2))
        {
            SetRectEmpty(lprcDst);
            return FALSE;
        }
        else
        {
            *lprcDst = *lprcSrc2;
        }
    }
    else
    {
        if (IsRectEmpty(lprcSrc2))
        {
            *lprcDst = *lprcSrc1;
        }
        else
        {
            lprcDst->left = min(lprcSrc1->left, lprcSrc2->left);
            lprcDst->top = min(lprcSrc1->top, lprcSrc2->top);
            lprcDst->right = max(lprcSrc1->right, lprcSrc2->right);
            lprcDst->bottom = max(lprcSrc1->bottom, lprcSrc2->bottom);
        }
    }
 
    return TRUE;
}