76 lines
2.8 KiB
C++
76 lines
2.8 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* Additional copyright for this file:
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* Copyright (C) 1995-1997 Presto Studios, Inc.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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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. See the
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* GNU General Public License for more details.
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*
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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, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include "pegasus/neighborhood/mars/hermite.h"
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namespace Pegasus {
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CoordType hermite(CoordType p1, CoordType p4, CoordType r1, CoordType r4, int32 time, int32 duration) {
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float t = (float)time / duration;
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float tsq = t * t;
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float tcu = t * tsq;
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float tcu2 = tcu + tcu;
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float tsq2 = tsq + tsq;
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float tsq3 = tsq2 + tsq;
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return (CoordType)((tcu2 - tsq3 + 1) * p1 + (tsq3 - tcu2) * p4 + (tcu - tsq2 + t) * r1 + (tcu - tsq) * r4);
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}
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CoordType dHermite(CoordType p1, CoordType p4, CoordType r1, CoordType r4, int32 time, int32 duration) {
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float t = (float)time / duration;
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float t2 = t + t;
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float t4 = t2 + t2;
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float t6 = t4 + t2;
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float tsq = t * t;
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float tsq3 = tsq + tsq + tsq;
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float tsq6 = tsq3 + tsq3;
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return (CoordType)((tsq6 - t6) * p1 + (t6 - tsq6) * p4 + (tsq3 - t4 + 1) * r1 + (tsq3 - t2) * r4);
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}
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void hermite(Common::Point p1, Common::Point p4, Common::Point r1, Common::Point r4, int32 time, int32 duration, Common::Point &result) {
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float t = (float)time / duration;
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float tsq = t * t;
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float tcu = t * tsq;
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float tcu2 = tcu + tcu;
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float tsq2 = tsq + tsq;
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float tsq3 = tsq2 + tsq;
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result.x = (int16)((tcu2 - tsq3 + 1) * p1.x + (tsq3 - tcu2) * p4.x + (tcu - tsq2 + t) * r1.x + (tcu - tsq) * r4.x);
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result.y = (int16)((tcu2 - tsq3 + 1) * p1.y + (tsq3 - tcu2) * p4.y + (tcu - tsq2 + t) * r1.y + (tcu - tsq) * r4.y);
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}
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void dHermite(Common::Point p1, Common::Point p4, Common::Point r1, Common::Point r4, int32 time, int32 duration, Common::Point &result) {
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float t = (float)time / duration;
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float t2 = t + t;
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float t4 = t2 + t2;
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float t6 = t4 + t2;
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float tsq = t * t;
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float tsq3 = tsq + tsq + tsq;
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float tsq6 = tsq3 + tsq3;
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result.x = (int16)((tsq6 - t6) * p1.x + (t6 - tsq6) * p4.x + (tsq3 - t4 + 1) * r1.x + (tsq3 - t2) * r4.x);
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result.y = (int16)((tsq6 - t6) * p1.y + (t6 - tsq6) * p4.y + (tsq3 - t4 + 1) * r1.y + (tsq3 - t2) * r4.y);
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}
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} // End of namespace Pegasus
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