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