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/* $Header$ */
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/*
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* tkWinRegion.c --
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*
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* Tk Region emulation code.
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*
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* Copyright (c) 1995 Sun Microsystems, Inc.
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*
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* See the file "license.terms" for information on usage and redistribution
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* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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*
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* RCS: @(#) $Id: tkwinregion.c,v 1.1.1.1 2001/06/13 05:14:15 dtashley Exp $
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*/
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#include "tkWinInt.h"
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/*
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*----------------------------------------------------------------------
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*
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* TkCreateRegion --
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*
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* Construct an empty region.
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*
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* Results:
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* Returns a new region handle.
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*
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* Side effects:
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* None.
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*
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*----------------------------------------------------------------------
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*/
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TkRegion
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TkCreateRegion()
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{
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RECT rect;
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memset(&rect, 0, sizeof(RECT));
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return (TkRegion) CreateRectRgnIndirect(&rect);
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}
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/*
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*----------------------------------------------------------------------
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*
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* TkDestroyRegion --
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*
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* Destroy the specified region.
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*
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* Results:
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* None.
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*
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* Side effects:
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* Frees the storage associated with the specified region.
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*
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*----------------------------------------------------------------------
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*/
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void
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TkDestroyRegion(r)
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TkRegion r;
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{
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DeleteObject((HRGN) r);
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}
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/*
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*----------------------------------------------------------------------
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*
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* TkClipBox --
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*
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* Computes the bounding box of a region.
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*
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* Results:
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* Sets rect_return to the bounding box of the region.
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*
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* Side effects:
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* None.
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*
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*----------------------------------------------------------------------
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*/
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void
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TkClipBox(r, rect_return)
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TkRegion r;
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XRectangle* rect_return;
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{
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RECT rect;
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GetRgnBox((HRGN)r, &rect);
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rect_return->x = (short) rect.left;
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rect_return->y = (short) rect.top;
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rect_return->width = (short) (rect.right - rect.left);
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rect_return->height = (short) (rect.bottom - rect.top);
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}
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/*
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*----------------------------------------------------------------------
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*
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* TkIntersectRegion --
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*
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* Compute the intersection of two regions.
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*
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* Results:
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* Returns the result in the dr_return region.
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*
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* Side effects:
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* None.
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*
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*----------------------------------------------------------------------
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*/
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void
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TkIntersectRegion(sra, srb, dr_return)
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TkRegion sra;
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TkRegion srb;
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TkRegion dr_return;
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{
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CombineRgn((HRGN) dr_return, (HRGN) sra, (HRGN) srb, RGN_AND);
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}
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/*
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*----------------------------------------------------------------------
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*
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* TkUnionRectWithRegion --
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*
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* Create the union of a source region and a rectangle.
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*
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* Results:
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* Returns the result in the dr_return region.
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*
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* Side effects:
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* None.
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*
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*----------------------------------------------------------------------
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*/
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void
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TkUnionRectWithRegion(rectangle, src_region, dest_region_return)
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XRectangle* rectangle;
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TkRegion src_region;
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TkRegion dest_region_return;
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{
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HRGN rectRgn = CreateRectRgn(rectangle->x, rectangle->y,
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rectangle->x + rectangle->width, rectangle->y + rectangle->height);
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CombineRgn((HRGN) dest_region_return, (HRGN) src_region,
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(HRGN) rectRgn, RGN_OR);
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DeleteObject(rectRgn);
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}
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/*
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*----------------------------------------------------------------------
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*
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* TkRectInRegion --
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*
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* Test whether a given rectangle overlaps with a region.
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*
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* Results:
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* Returns RectanglePart or RectangleOut. Note that this is
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* not a complete implementation since it doesn't test for
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* RectangleIn.
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*
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* Side effects:
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* None.
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*
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*----------------------------------------------------------------------
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*/
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int
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TkRectInRegion(r, x, y, width, height)
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TkRegion r;
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int x;
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int y;
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unsigned int width;
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unsigned int height;
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{
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RECT rect;
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rect.top = y;
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rect.left = x;
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rect.bottom = y+height;
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rect.right = x+width;
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return RectInRegion((HRGN)r, &rect) ? RectanglePart : RectangleOut;
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}
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/* End of tkwinregion.c */
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