GHOST_Rect.cpp

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/*
 * $Id: GHOST_Rect.cpp 35152 2011-02-25 11:28:33Z jesterking $
 * ***** 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 *****
 */

#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;
}