config_gen/src/box.cpp (4ef7955) - libetherpix · BlinkenArea

box.cpp

/*
 * EtherPix config file generator
 *
 * Copyright 2010-2017 Stefan Schuermans <stefan schuermans info>
 *
 * 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, version 3 of the License.
 *
 *
 * 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 Lesser General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */

#include <stdlib.h>

#include "box.h"
#include "constants.h"
#include "point.h"

Box::Box()
{
}

Box::Box(const Point &bl, const Point &tr):
  mBL(bl),
  mTR(tr)
{
  fix();
}

void Box::fix()
{
  if (mBL.mX > mTR.mX) {
    double tmp = mBL.mX;
    mBL.mX = mTR.mX;
    mTR.mX = tmp;
  }
  if (mBL.mY > mTR.mY) {
    double tmp = mBL.mY;
    mBL.mY = mTR.mY;
    mTR.mY = tmp;
  }
}

void Box::getCenter(Point &center)
{
  center = (mBL + mTR) / 2.0;
}

void Box::include(const Point &p)
{
  if (p.mX < mBL.mX)
    mBL.mX = p.mX;
  if (p.mY < mBL.mY)
    mBL.mY = p.mY;
  if (p.mX > mTR.mX)
    mTR.mX = p.mX;
  if (p.mY > mTR.mY)
    mTR.mY = p.mY;
}

void Box::include(const Box &b)
{
  if (b.mBL.mX < mBL.mX)
    mBL.mX = b.mBL.mX;
  if (b.mBL.mY < mBL.mY)
    mBL.mY = b.mBL.mY;
  if (b.mTR.mX > mTR.mX)
    mTR.mX = b.mTR.mX;
  if (b.mTR.mY > mTR.mY)
    mTR.mY = b.mTR.mY;
}

bool Box::isIntersecting(const Box *pBox) const
{
  return getIntersection(pBox, NULL);
}

bool Box::getIntersection(const Box *pBox, Box *pIntersect) const
{
  Point bl = mBL, tr = mTR;
  if (pBox->mBL.mX > bl.mX)
    bl.mX = pBox->mBL.mX;
  if (pBox->mBL.mY > bl.mY)
    bl.mY = pBox->mBL.mY;
  if (pBox->mTR.mX < tr.mX)
    tr.mX = pBox->mTR.mX;
  if (pBox->mTR.mY < tr.mY)
    tr.mY = pBox->mTR.mY;
  if (tr.mX - bl.mX < -EPSILON || tr.mY - bl.mY < -EPSILON)
    return false;
  if (pIntersect) {
    pIntersect->mBL = bl;
    pIntersect->mTR = tr;
    pIntersect->fix();
  }
  return true;
}

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