/*
 * ***** BEGIN GPL LICENSE BLOCK *****
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
 * All rights reserved.
 *
 * The Original Code is: all of this file.
 *
 * Contributor(s): none yet.
 *
 * ***** END GPL LICENSE BLOCK *****
 */

/** \file ghost/intern/GHOST_Rect.cpp
 *  \ingroup GHOST
 */


#include "GHOST_Rect.h"



void GHOST_Rect::inset(GHOST_TInt32 i)
{
	if (i > 0) {
		// Grow the rectangle
		m_l -= i;
		m_r += i;
		m_t -= i;
		m_b += i;
	}
	else if (i < 0) {
		// Shrink the rectangle, check for insets larger than half the size
		GHOST_TInt32 i2 = i * 2;
		if (getWidth() > i2) {
			m_l += i;
			m_r -= i;
		}
		else {
			m_l = m_l + ((m_r - m_l) / 2);
			m_r = m_l;
		}
		if (getHeight() > i2) {
			m_t += i;
			m_b -= i;
		}
		else {
			m_t = m_t + ((m_b - m_t) / 2);
			m_b = m_t;
		}
	}
}


GHOST_TVisibility GHOST_Rect::getVisibility(GHOST_Rect& r) const
{
	bool lt = isInside(r.m_l, r.m_t);
	bool rt = isInside(r.m_r, r.m_t);
	bool lb = isInside(r.m_l, r.m_b);
	bool rb = isInside(r.m_r, r.m_b);
	GHOST_TVisibility v;
	if (lt && rt && lb && rb) {
		// All points inside, rectangle is inside this
		v = GHOST_kFullyVisible;
	}
	else if (!(lt || rt || lb || rb)) {
		// None of the points inside
		// Check to see whether the rectangle is larger than this one
		if ((r.m_l < m_l) && (r.m_t < m_t) && (r.m_r > m_r) && (r.m_b > m_b)) {
			v = GHOST_kPartiallyVisible;
		}
		else {
			v = GHOST_kNotVisible;
		}
	}
	else {
		// Some of the points inside, rectangle is partially inside
		v = GHOST_kPartiallyVisible;
	}
	return v;
}


void GHOST_Rect::setCenter(GHOST_TInt32 cx, GHOST_TInt32 cy)
{
	GHOST_TInt32 offset = cx - (m_l + (m_r - m_l) / 2);
	m_l += offset;
	m_r += offset;
	offset = cy - (m_t + (m_b - m_t) / 2);
	m_t += offset;
	m_b += offset;
}

void GHOST_Rect::setCenter(GHOST_TInt32 cx, GHOST_TInt32 cy, GHOST_TInt32 w, GHOST_TInt32 h)
{
	long w_2, h_2;
	
	w_2 = w >> 1;
	h_2 = h >> 1;
	m_l = cx - w_2;
	m_t = cy - h_2;
	m_r = m_l + w;
	m_b = m_t + h;
}

bool GHOST_Rect::clip(GHOST_Rect& r) const
{
	bool clipped = false;
	if (r.m_l < m_l) {
		r.m_l = m_l;
		clipped = true;
	}
	if (r.m_t < m_t) {
		r.m_t = m_t;
		clipped = true;
	}
	if (r.m_r > m_r) {
		r.m_r = m_r;
		clipped = true;
	}
	if (r.m_b > m_b) {
		r.m_b = m_b;
		clipped = true;
	}
	return clipped;
}

