qzdoom/src/m_bbox.cpp

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// Emacs style mode select -*- C++ -*-
//-----------------------------------------------------------------------------
//
// $Id:$
//
// Copyright (C) 1993-1996 by id Software, Inc.
//
// This source is available for distribution and/or modification
// only under the terms of the DOOM Source Code License as
// published by id Software. All rights reserved.
//
// The source is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// FITNESS FOR A PARTICULAR PURPOSE. See the DOOM Source Code License
// for more details.
//
// $Log:$
//
// DESCRIPTION:
// Main loop menu stuff.
// Random number LUT.
// Default Config File.
// PCX Screenshots.
//
//-----------------------------------------------------------------------------
#include "m_bbox.h"
#include "p_local.h"
#include "p_maputl.h"
//==========================================================================
//
//
//
//==========================================================================
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void FBoundingBox::AddToBox (const DVector2 &pos)
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{
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if (pos.X < m_Box[BOXLEFT])
m_Box[BOXLEFT] = pos.X;
if (pos.X > m_Box[BOXRIGHT])
m_Box[BOXRIGHT] = pos.X;
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if (pos.Y < m_Box[BOXBOTTOM])
m_Box[BOXBOTTOM] = pos.Y;
if (pos.Y > m_Box[BOXTOP])
m_Box[BOXTOP] = pos.Y;
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}
//==========================================================================
//
// FBoundingBox :: BoxOnLineSide
//
// Considers the line to be infinite
// Returns side 0 or 1, -1 if box crosses the line.
//
//==========================================================================
int FBoundingBox::BoxOnLineSide (const line_t *ld) const
{
int p1;
int p2;
if (ld->Delta().X == 0)
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{ // ST_VERTICAL
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p1 = m_Box[BOXRIGHT] < ld->v1->fX();
p2 = m_Box[BOXLEFT] < ld->v1->fX();
if (ld->Delta().Y < 0)
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{
p1 ^= 1;
p2 ^= 1;
}
}
else if (ld->Delta().Y == 0)
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{ // ST_HORIZONTAL:
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p1 = m_Box[BOXTOP] > ld->v1->fY();
p2 = m_Box[BOXBOTTOM] > ld->v1->fY();
if (ld->Delta().X < 0)
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{
p1 ^= 1;
p2 ^= 1;
}
}
else if ((ld->Delta().X * ld->Delta().Y) >= 0)
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{ // ST_POSITIVE:
p1 = P_PointOnLineSide (m_Box[BOXLEFT], m_Box[BOXTOP], ld);
p2 = P_PointOnLineSide (m_Box[BOXRIGHT], m_Box[BOXBOTTOM], ld);
}
else
{ // ST_NEGATIVE:
p1 = P_PointOnLineSide (m_Box[BOXRIGHT], m_Box[BOXTOP], ld);
p2 = P_PointOnLineSide (m_Box[BOXLEFT], m_Box[BOXBOTTOM], ld);
}
return (p1 == p2) ? p1 : -1;
}