src/msw/region.cpp

/////////////////////////////////////////////////////////////////////////////
// Name:        msw/region.cpp
// Purpose:   Region handling for wxWindows/X11
// Author:    Markus Holzem
// Modified by:
// Created:   Fri Oct 24 10:46:34 MET 1997
// RCS-ID:	  $Id$
// Copyright: (c) 1997 Julian Smart and Markus Holzem
// Licence:   wxWindows licence
/////////////////////////////////////////////////////////////////////////////

#ifdef __GNUG__
#pragma implementation "region.h"
#endif

// For compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"

#ifdef __BORLANDC__
#pragma hdrstop
#endif

#include "wx/msw/region.h"
#include "wx/gdicmn.h"

#include <windows.h>

#if !USE_SHARED_LIBRARY
	IMPLEMENT_DYNAMIC_CLASS(wxRegion, wxGDIObject)
	IMPLEMENT_DYNAMIC_CLASS(wxRegionIterator, wxObject)
#endif

//-----------------------------------------------------------------------------
// wxRegionRefData implementation
//-----------------------------------------------------------------------------

class WXDLLEXPORT wxRegionRefData : public wxGDIRefData {
public:
	wxRegionRefData(void)
	{
        m_region = 0;
	}

	wxRegionRefData(const wxRegionRefData& data)
	{
#if defined(__WIN32__)
        DWORD noBytes = ::GetRegionData(data.m_region, 0, NULL);
        RGNDATA *rgnData = (RGNDATA*) new char[noBytes];
		::GetRegionData(data.m_region, noBytes, rgnData);
        m_region = ::ExtCreateRegion(NULL, noBytes, rgnData);
        delete[] (char*) rgnData;
#else
        RECT rect;
        ::GetRgnBox(data.m_region, &rect);
        m_region = ::CreateRectRgnIndirect(&rect);
#endif
	}

	~wxRegionRefData(void)
	{
		::DeleteObject(m_region);
        m_region = 0;
	}

	HRGN m_region;
};

#define M_REGION (((wxRegionRefData*)m_refData)->m_region)

//-----------------------------------------------------------------------------
// wxRegion
//-----------------------------------------------------------------------------

/*!
 * Create an empty region.
 */
wxRegion::wxRegion(void)
{
    m_refData = new wxRegionRefData;
    M_REGION = ::CreateRectRgn(0, 0, 0, 0);
}

wxRegion::wxRegion(WXHRGN hRegion)
{
    m_refData = new wxRegionRefData;
    M_REGION = (HRGN) hRegion;
}

wxRegion::wxRegion(long x, long y, long w, long h)
{
    m_refData = new wxRegionRefData;
    M_REGION = ::CreateRectRgn(x, y, x + w, y + h);
}

wxRegion::wxRegion(const wxPoint& topLeft, const wxPoint& bottomRight)
{
    m_refData = new wxRegionRefData;
    M_REGION = ::CreateRectRgn(topLeft.x, topLeft.y, bottomRight.x, bottomRight.y);
}

wxRegion::wxRegion(const wxRect& rect)
{
    m_refData = new wxRegionRefData;
    M_REGION = ::CreateRectRgn(rect.GetLeft(), rect.GetTop(), rect.GetRight(), rect.GetBottom());
}

/*!
 * Destroy the region.
 */
wxRegion::~wxRegion(void)
{
    // m_refData unrefed in ~wxObject
}

//-----------------------------------------------------------------------------
//# Modify region
//-----------------------------------------------------------------------------

//! Clear current region
void wxRegion::Clear(void)
{
	UnRef();
}

//! Combine rectangle (x, y, w, h) with this.
bool wxRegion::Combine(long x, long y, long width, long height, wxRegionOp op)
{
	// Don't change shared data
	if (!m_refData) {
		m_refData = new wxRegionRefData();
	} else if (m_refData->GetRefCount() > 1) {
		wxRegionRefData* ref = (wxRegionRefData*)m_refData;
		UnRef();
		m_refData = new wxRegionRefData(*ref);
	}
    // If ref count is 1, that means it's 'ours' anyway so no action.

    HRGN rectRegion = ::CreateRectRgn(x, y, x + width, y + height);

    int mode = 0;
    switch (op)
    {
        case wxRGN_AND: mode = RGN_AND; break ;
        case wxRGN_OR: mode = RGN_OR; break ;
        case wxRGN_XOR: mode = RGN_XOR; break ;
        case wxRGN_DIFF: mode = RGN_DIFF; break ;
        case wxRGN_COPY:
        default:
            mode = RGN_COPY; break ;
    }

	bool success = (ERROR != ::CombineRgn(M_REGION, M_REGION, rectRegion, mode));

    ::DeleteObject(rectRegion);

    return success;
}

//! Union /e region with this.
bool wxRegion::Combine(const wxRegion& region, wxRegionOp op)
{
	if (region.Empty())
		return FALSE;

	// Don't change shared data
	if (!m_refData) {
		m_refData = new wxRegionRefData();
	} else	if (m_refData->GetRefCount() > 1) {
		wxRegionRefData* ref = (wxRegionRefData*)m_refData;
		UnRef();
		m_refData = new wxRegionRefData(*ref);
	}

    int mode = 0;
    switch (op)
    {
        case wxRGN_AND: mode = RGN_AND; break ;
        case wxRGN_OR: mode = RGN_OR; break ;
        case wxRGN_XOR: mode = RGN_XOR; break ;
        case wxRGN_DIFF: mode = RGN_DIFF; break ;
        case wxRGN_COPY:
        default:
            mode = RGN_COPY; break ;
    }

	return (ERROR != ::CombineRgn(M_REGION, M_REGION, ((wxRegionRefData*)region.m_refData)->m_region, mode));
}

bool wxRegion::Combine(const wxRect& rect, wxRegionOp op)
{
    return Combine(rect.GetLeft(), rect.GetTop(), rect.GetWidth(), rect.GetHeight(), op);
}

//-----------------------------------------------------------------------------
//# Information on region
//-----------------------------------------------------------------------------

// Outer bounds of region
void wxRegion::GetBox(long& x, long& y, long&w, long &h) const
{
	if (m_refData) {
        RECT rect;
        ::GetRgnBox(M_REGION, & rect);
		x = rect.left;
		y = rect.top;
		w = rect.right - rect.left;
		h = rect.bottom - rect.top;
	} else {
		x = y = w = h = 0;
	}
}

wxRect wxRegion::GetBox(void) const
{
    long x, y, w, h;
    GetBox(x, y, w, h);
    return wxRect(x, y, w, h);
}

// Is region empty?
bool wxRegion::Empty(void) const
{
    if (M_REGION == 0)
        return TRUE;
    long x, y, w, h;
    GetBox(x, y, w, h);

    return ((w == 0) && (h == 0));
}

//-----------------------------------------------------------------------------
//# Tests
//-----------------------------------------------------------------------------

// Does the region contain the point (x,y)?
wxRegionContain wxRegion::Contains(long x, long y) const
{
	if (!m_refData)
		return wxOutRegion;

    if (::PtInRegion(M_REGION, (int) x, (int) y))
        return wxInRegion;
    else
        return wxOutRegion;
}

// Does the region contain the point pt?
wxRegionContain wxRegion::Contains(const wxPoint& pt) const
{
	if (!m_refData)
		return wxOutRegion;

    if (::PtInRegion(M_REGION, (int) pt.x, (int) pt.y))
        return wxInRegion;
    else
        return wxOutRegion;
}

// Does the region contain the rectangle (x, y, w, h)?
wxRegionContain wxRegion::Contains(long x, long y, long w, long h) const
{
	if (!m_refData)
		return wxOutRegion;

    RECT rect;
    rect.left = x;
    rect.top = y;
    rect.right = x + w;
    rect.bottom = y + h;

    if (::RectInRegion(M_REGION, & rect))
        return wxInRegion;
    else
        return wxOutRegion;
}

// Does the region contain the rectangle rect
wxRegionContain wxRegion::Contains(const wxRect& rect) const
{
	if (!m_refData)
		return wxOutRegion;

    long x, y, w, h;
    x = rect.x;
    y = rect.y;
    w = rect.GetWidth();
    h = rect.GetHeight();
    return Contains(x, y, w, h);
}

///////////////////////////////////////////////////////////////////////////////
//																			 //
//							   wxRegionIterator								 //
//																			 //
///////////////////////////////////////////////////////////////////////////////

/*!
 * Initialize empty iterator
 */
wxRegionIterator::wxRegionIterator(void) : m_current(0), m_numRects(0), m_rects(NULL)
{
}

wxRegionIterator::~wxRegionIterator(void)
{
    if (m_rects)
        delete[] m_rects;
}

/*!
 * Initialize iterator for region
 */
wxRegionIterator::wxRegionIterator(const wxRegion& region)
{
    m_rects = NULL;

	Reset(region);
}

/*!
 * Reset iterator for a new /e region.
 */
void wxRegionIterator::Reset(const wxRegion& region)
{
	m_current = 0;
	m_region = region;

    if (m_rects)
        delete[] m_rects;

    m_rects = NULL;

	if (m_region.Empty())
		m_numRects = 0;
	else
    {
#if defined(__WIN32__)
        DWORD noBytes = ::GetRegionData(((wxRegionRefData*)region.m_refData)->m_region, 0, NULL);
        RGNDATA *rgnData = (RGNDATA*) new char[noBytes];
		::GetRegionData(((wxRegionRefData*)region.m_refData)->m_region, noBytes, rgnData);

        RGNDATAHEADER* header = (RGNDATAHEADER*) rgnData;

        m_rects = new wxRect[header->nCount];

        RECT* rect = (RECT*) (rgnData + sizeof(RGNDATAHEADER)) ;
        size_t i;
        for (i = 0; i < header->nCount; i++)
        {
            m_rects[i] = wxRect(rect->left, rect->top,
                                 rect->right - rect->left, rect->bottom - rect->top);
            rect += sizeof(RECT);
        }

        m_numRects = header->nCount;

        delete[] (char*) rgnData;
#else
        RECT rect;
        ::GetRgnBox(((wxRegionRefData*)region.m_refData)->m_region, &rect);
        m_rects = new wxRect[1];
        m_rects[0].x = rect.left;
        m_rects[0].y = rect.top;
        m_rects[0].width = rect.right - rect.left;
        m_rects[0].height = rect.bottom - rect.top;

        m_numRects = 1;
#endif
    }
}

/*!
 * Increment iterator. The rectangle returned is the one after the
 * incrementation.
 */
void wxRegionIterator::operator ++ (void)
{
	if (m_current < m_numRects)
		++m_current;
}

/*!
 * Increment iterator. The rectangle returned is the one before the
 * incrementation.
 */
void wxRegionIterator::operator ++ (int)
{
	if (m_current < m_numRects)
		++m_current;
}

long wxRegionIterator::GetX(void) const
{
	if (m_current < m_numRects)
		return m_rects[m_current].x;
	return 0;
}

long wxRegionIterator::GetY(void) const
{
	if (m_current < m_numRects)
		return m_rects[m_current].y;
	return 0;
}

long wxRegionIterator::GetW(void) const
{
	if (m_current < m_numRects)
		return m_rects[m_current].width ;
	return 0;
}

long wxRegionIterator::GetH(void) const
{
	if (m_current < m_numRects)
		return m_rects[m_current].height;
	return 0;
}
Commit	Line	Data
	1	/////////////////////////////////////////////////////////////////////////////
	2	// Name: msw/region.cpp
	3	// Purpose: Region handling for wxWindows/X11
	4	// Author: Markus Holzem
	5	// Modified by:
	6	// Created: Fri Oct 24 10:46:34 MET 1997
	7	// RCS-ID: $Id$
	8	// Copyright: (c) 1997 Julian Smart and Markus Holzem
	9	// Licence: wxWindows licence
	10	/////////////////////////////////////////////////////////////////////////////
	11
	12	#ifdef __GNUG__
	13	#pragma implementation "region.h"
	14	#endif
	15
	16	// For compilers that support precompilation, includes "wx.h".
	17	#include "wx/wxprec.h"
	18
	19	#ifdef __BORLANDC__
	20	#pragma hdrstop
	21	#endif
	22
	23	#include "wx/msw/region.h"
	24	#include "wx/gdicmn.h"
	25
	26	#include <windows.h>
	27
	28	#if !USE_SHARED_LIBRARY
	29	IMPLEMENT_DYNAMIC_CLASS(wxRegion, wxGDIObject)
	30	IMPLEMENT_DYNAMIC_CLASS(wxRegionIterator, wxObject)
	31	#endif
	32
	33	//-----------------------------------------------------------------------------
	34	// wxRegionRefData implementation
	35	//-----------------------------------------------------------------------------
	36
	37	class WXDLLEXPORT wxRegionRefData : public wxGDIRefData {
	38	public:
	39	wxRegionRefData(void)
	40	{
	41	m_region = 0;
	42	}
	43
	44	wxRegionRefData(const wxRegionRefData& data)
	45	{
	46	#if defined(__WIN32__)
	47	DWORD noBytes = ::GetRegionData(data.m_region, 0, NULL);
	48	RGNDATA rgnData = (RGNDATA) new char[noBytes];
	49	::GetRegionData(data.m_region, noBytes, rgnData);
	50	m_region = ::ExtCreateRegion(NULL, noBytes, rgnData);
	51	delete[] (char*) rgnData;
	52	#else
	53	RECT rect;
	54	::GetRgnBox(data.m_region, &rect);
	55	m_region = ::CreateRectRgnIndirect(&rect);
	56	#endif
	57	}
	58
	59	~wxRegionRefData(void)
	60	{
	61	::DeleteObject(m_region);
	62	m_region = 0;
	63	}
	64
	65	HRGN m_region;
	66	};
	67
	68	#define M_REGION (((wxRegionRefData*)m_refData)->m_region)
	69
	70	//-----------------------------------------------------------------------------
	71	// wxRegion
	72	//-----------------------------------------------------------------------------
	73
	74	/*!
	75	* Create an empty region.
	76	*/
	77	wxRegion::wxRegion(void)
	78	{
	79	m_refData = new wxRegionRefData;
	80	M_REGION = ::CreateRectRgn(0, 0, 0, 0);
	81	}
	82
	83	wxRegion::wxRegion(WXHRGN hRegion)
	84	{
	85	m_refData = new wxRegionRefData;
	86	M_REGION = (HRGN) hRegion;
	87	}
	88
	89	wxRegion::wxRegion(long x, long y, long w, long h)
	90	{
	91	m_refData = new wxRegionRefData;
	92	M_REGION = ::CreateRectRgn(x, y, x + w, y + h);
	93	}
	94
	95	wxRegion::wxRegion(const wxPoint& topLeft, const wxPoint& bottomRight)
	96	{
	97	m_refData = new wxRegionRefData;
	98	M_REGION = ::CreateRectRgn(topLeft.x, topLeft.y, bottomRight.x, bottomRight.y);
	99	}
	100
	101	wxRegion::wxRegion(const wxRect& rect)
	102	{
	103	m_refData = new wxRegionRefData;
	104	M_REGION = ::CreateRectRgn(rect.GetLeft(), rect.GetTop(), rect.GetRight(), rect.GetBottom());
	105	}
	106
	107	/*!
	108	* Destroy the region.
	109	*/
	110	wxRegion::~wxRegion(void)
	111	{
	112	// m_refData unrefed in ~wxObject
	113	}
	114
	115	//-----------------------------------------------------------------------------
	116	//# Modify region
	117	//-----------------------------------------------------------------------------
	118
	119	//! Clear current region
	120	void wxRegion::Clear(void)
	121	{
	122	UnRef();
	123	}
	124
	125	//! Combine rectangle (x, y, w, h) with this.
	126	bool wxRegion::Combine(long x, long y, long width, long height, wxRegionOp op)
	127	{
	128	// Don't change shared data
	129	if (!m_refData) {
	130	m_refData = new wxRegionRefData();
	131	} else if (m_refData->GetRefCount() > 1) {
	132	wxRegionRefData* ref = (wxRegionRefData*)m_refData;
	133	UnRef();
	134	m_refData = new wxRegionRefData(*ref);
	135	}
	136	// If ref count is 1, that means it's 'ours' anyway so no action.
	137
	138	HRGN rectRegion = ::CreateRectRgn(x, y, x + width, y + height);
	139
	140	int mode = 0;
	141	switch (op)
	142	{
	143	case wxRGN_AND: mode = RGN_AND; break ;
	144	case wxRGN_OR: mode = RGN_OR; break ;
	145	case wxRGN_XOR: mode = RGN_XOR; break ;
	146	case wxRGN_DIFF: mode = RGN_DIFF; break ;
	147	case wxRGN_COPY:
	148	default:
	149	mode = RGN_COPY; break ;
	150	}
	151
	152	bool success = (ERROR != ::CombineRgn(M_REGION, M_REGION, rectRegion, mode));
	153
	154	::DeleteObject(rectRegion);
	155
	156	return success;
	157	}
	158
	159	//! Union /e region with this.
	160	bool wxRegion::Combine(const wxRegion& region, wxRegionOp op)
	161	{
	162	if (region.Empty())
	163	return FALSE;
	164
	165	// Don't change shared data
	166	if (!m_refData) {
	167	m_refData = new wxRegionRefData();
	168	} else if (m_refData->GetRefCount() > 1) {
	169	wxRegionRefData* ref = (wxRegionRefData*)m_refData;
	170	UnRef();
	171	m_refData = new wxRegionRefData(*ref);
	172	}
	173
	174	int mode = 0;
	175	switch (op)
	176	{
	177	case wxRGN_AND: mode = RGN_AND; break ;
	178	case wxRGN_OR: mode = RGN_OR; break ;
	179	case wxRGN_XOR: mode = RGN_XOR; break ;
	180	case wxRGN_DIFF: mode = RGN_DIFF; break ;
	181	case wxRGN_COPY:
	182	default:
	183	mode = RGN_COPY; break ;
	184	}
	185
	186	return (ERROR != ::CombineRgn(M_REGION, M_REGION, ((wxRegionRefData*)region.m_refData)->m_region, mode));
	187	}
	188
	189	bool wxRegion::Combine(const wxRect& rect, wxRegionOp op)
	190	{
	191	return Combine(rect.GetLeft(), rect.GetTop(), rect.GetWidth(), rect.GetHeight(), op);
	192	}
	193
	194	//-----------------------------------------------------------------------------
	195	//# Information on region
	196	//-----------------------------------------------------------------------------
	197
	198	// Outer bounds of region
	199	void wxRegion::GetBox(long& x, long& y, long&w, long &h) const
	200	{
	201	if (m_refData) {
	202	RECT rect;
	203	::GetRgnBox(M_REGION, & rect);
	204	x = rect.left;
	205	y = rect.top;
	206	w = rect.right - rect.left;
	207	h = rect.bottom - rect.top;
	208	} else {
	209	x = y = w = h = 0;
	210	}
	211	}
	212
	213	wxRect wxRegion::GetBox(void) const
	214	{
	215	long x, y, w, h;
	216	GetBox(x, y, w, h);
	217	return wxRect(x, y, w, h);
	218	}
	219
	220	// Is region empty?
	221	bool wxRegion::Empty(void) const
	222	{
	223	if (M_REGION == 0)
	224	return TRUE;
	225	long x, y, w, h;
	226	GetBox(x, y, w, h);
	227
	228	return ((w == 0) && (h == 0));
	229	}
	230
	231	//-----------------------------------------------------------------------------
	232	//# Tests
	233	//-----------------------------------------------------------------------------
	234
	235	// Does the region contain the point (x,y)?
	236	wxRegionContain wxRegion::Contains(long x, long y) const
	237	{
	238	if (!m_refData)
	239	return wxOutRegion;
	240
	241	if (::PtInRegion(M_REGION, (int) x, (int) y))
	242	return wxInRegion;
	243	else
	244	return wxOutRegion;
	245	}
	246
	247	// Does the region contain the point pt?
	248	wxRegionContain wxRegion::Contains(const wxPoint& pt) const
	249	{
	250	if (!m_refData)
	251	return wxOutRegion;
	252
	253	if (::PtInRegion(M_REGION, (int) pt.x, (int) pt.y))
	254	return wxInRegion;
	255	else
	256	return wxOutRegion;
	257	}
	258
	259	// Does the region contain the rectangle (x, y, w, h)?
	260	wxRegionContain wxRegion::Contains(long x, long y, long w, long h) const
	261	{
	262	if (!m_refData)
	263	return wxOutRegion;
	264
	265	RECT rect;
	266	rect.left = x;
	267	rect.top = y;
	268	rect.right = x + w;
	269	rect.bottom = y + h;
	270
	271	if (::RectInRegion(M_REGION, & rect))
	272	return wxInRegion;
	273	else
	274	return wxOutRegion;
	275	}
	276
	277	// Does the region contain the rectangle rect
	278	wxRegionContain wxRegion::Contains(const wxRect& rect) const
	279	{
	280	if (!m_refData)
	281	return wxOutRegion;
	282
	283	long x, y, w, h;
	284	x = rect.x;
	285	y = rect.y;
	286	w = rect.GetWidth();
	287	h = rect.GetHeight();
	288	return Contains(x, y, w, h);
	289	}
	290
	291	///////////////////////////////////////////////////////////////////////////////
	292	// //
	293	// wxRegionIterator //
	294	// //
	295	///////////////////////////////////////////////////////////////////////////////
	296
	297	/*!
	298	* Initialize empty iterator
	299	*/
	300	wxRegionIterator::wxRegionIterator(void) : m_current(0), m_numRects(0), m_rects(NULL)
	301	{
	302	}
	303
	304	wxRegionIterator::~wxRegionIterator(void)
	305	{
	306	if (m_rects)
	307	delete[] m_rects;
	308	}
	309
	310	/*!
	311	* Initialize iterator for region
	312	*/
	313	wxRegionIterator::wxRegionIterator(const wxRegion& region)
	314	{
	315	m_rects = NULL;
	316
	317	Reset(region);
	318	}
	319
	320	/*!
	321	* Reset iterator for a new /e region.
	322	*/
	323	void wxRegionIterator::Reset(const wxRegion& region)
	324	{
	325	m_current = 0;
	326	m_region = region;
	327
	328	if (m_rects)
	329	delete[] m_rects;
	330
	331	m_rects = NULL;
	332
	333	if (m_region.Empty())
	334	m_numRects = 0;
	335	else
	336	{
	337	#if defined(__WIN32__)
	338	DWORD noBytes = ::GetRegionData(((wxRegionRefData*)region.m_refData)->m_region, 0, NULL);
	339	RGNDATA rgnData = (RGNDATA) new char[noBytes];
	340	::GetRegionData(((wxRegionRefData*)region.m_refData)->m_region, noBytes, rgnData);
	341
	342	RGNDATAHEADER* header = (RGNDATAHEADER*) rgnData;
	343
	344	m_rects = new wxRect[header->nCount];
	345
	346	RECT* rect = (RECT*) (rgnData + sizeof(RGNDATAHEADER)) ;
	347	size_t i;
	348	for (i = 0; i < header->nCount; i++)
	349	{
	350	m_rects[i] = wxRect(rect->left, rect->top,
	351	rect->right - rect->left, rect->bottom - rect->top);
	352	rect += sizeof(RECT);
	353	}
	354
	355	m_numRects = header->nCount;
	356
	357	delete[] (char*) rgnData;
	358	#else
	359	RECT rect;
	360	::GetRgnBox(((wxRegionRefData*)region.m_refData)->m_region, &rect);
	361	m_rects = new wxRect[1];
	362	m_rects[0].x = rect.left;
	363	m_rects[0].y = rect.top;
	364	m_rects[0].width = rect.right - rect.left;
	365	m_rects[0].height = rect.bottom - rect.top;
	366
	367	m_numRects = 1;
	368	#endif
	369	}
	370	}
	371
	372	/*!
	373	* Increment iterator. The rectangle returned is the one after the
	374	* incrementation.
	375	*/
	376	void wxRegionIterator::operator ++ (void)
	377	{
	378	if (m_current < m_numRects)
	379	++m_current;
	380	}
	381
	382	/*!
	383	* Increment iterator. The rectangle returned is the one before the
	384	* incrementation.
	385	*/
	386	void wxRegionIterator::operator ++ (int)
	387	{
	388	if (m_current < m_numRects)
	389	++m_current;
	390	}
	391
	392	long wxRegionIterator::GetX(void) const
	393	{
	394	if (m_current < m_numRects)
	395	return m_rects[m_current].x;
	396	return 0;
	397	}
	398
	399	long wxRegionIterator::GetY(void) const
	400	{
	401	if (m_current < m_numRects)
	402	return m_rects[m_current].y;
	403	return 0;
	404	}
	405
	406	long wxRegionIterator::GetW(void) const
	407	{
	408	if (m_current < m_numRects)
	409	return m_rects[m_current].width ;
	410	return 0;
	411	}
	412
	413	long wxRegionIterator::GetH(void) const
	414	{
	415	if (m_current < m_numRects)
	416	return m_rects[m_current].height;
	417	return 0;
	418	}
	419