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54 lines
1.6 KiB
C++
54 lines
1.6 KiB
C++
#include "ns.h" // Must come before everything else!
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//----------------------------------------------------------------------
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/*
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Copyright (C) 2010-2019 EDuke32 developers and contributors
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Copyright (C) 2019 Nuke.YKT
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This file is part of NBlood.
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NBlood is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License version 2
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as published by the Free Software Foundation.
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This program 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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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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//-------------------------------------------------------------------------
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#include "build.h"
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#include "blood.h"
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BEGIN_BLD_NS
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int OctantTable[8] = { 5, 6, 2, 1, 4, 7, 3, 0 };
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int GetOctant(int x, int y)
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{
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int vc = abs(x) - abs(y);
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return OctantTable[7 - (x < 0) - (y < 0) * 2 - (vc < 0) * 4];
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}
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void RotateVector(int* dx, int* dy, int nAngle)
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{
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int ox = *dx;
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int oy = *dy;
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*dx = dmulscale30r(ox, Cos(nAngle), -oy, Sin(nAngle));
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*dy = dmulscale30r(ox, Sin(nAngle), oy, Cos(nAngle));
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}
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void RotatePoint(int* x, int* y, int nAngle, int ox, int oy)
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{
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int dx = *x - ox;
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int dy = *y - oy;
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*x = ox + dmulscale30r(dx, Cos(nAngle), -dy, Sin(nAngle));
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*y = oy + dmulscale30r(dx, Sin(nAngle), dy, Cos(nAngle));
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}
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END_BLD_NS
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