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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* Additional copyright for this file:
* Copyright (C) 1995-1997 Presto Studios, Inc.
*
* 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; either version 2
* of the License, or (at your option) any later version.
* 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 General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include "pegasus/neighborhood/mars/hermite.h"
namespace Pegasus {
CoordType hermite(CoordType p1, CoordType p4, CoordType r1, CoordType r4, int32 time, int32 duration) {
float t = (float)time / duration;
float tsq = t * t;
float tcu = t * tsq;
float tcu2 = tcu + tcu;
float tsq2 = tsq + tsq;
float tsq3 = tsq2 + tsq;
return (CoordType)((tcu2 - tsq3 + 1) * p1 + (tsq3 - tcu2) * p4 + (tcu - tsq2 + t) * r1 + (tcu - tsq) * r4);
}
CoordType dHermite(CoordType p1, CoordType p4, CoordType r1, CoordType r4, int32 time, int32 duration) {
float t = (float)time / duration;
float t2 = t + t;
float t4 = t2 + t2;
float t6 = t4 + t2;
float tsq = t * t;
float tsq3 = tsq + tsq + tsq;
float tsq6 = tsq3 + tsq3;
return (CoordType)((tsq6 - t6) * p1 + (t6 - tsq6) * p4 + (tsq3 - t4 + 1) * r1 + (tsq3 - t2) * r4);
}
void hermite(Common::Point p1, Common::Point p4, Common::Point r1, Common::Point r4, int32 time, int32 duration, Common::Point &result) {
float t = (float)time / duration;
float tsq = t * t;
float tcu = t * tsq;
float tcu2 = tcu + tcu;
float tsq2 = tsq + tsq;
float tsq3 = tsq2 + tsq;
result.x = (int16)((tcu2 - tsq3 + 1) * p1.x + (tsq3 - tcu2) * p4.x + (tcu - tsq2 + t) * r1.x + (tcu - tsq) * r4.x);
result.y = (int16)((tcu2 - tsq3 + 1) * p1.y + (tsq3 - tcu2) * p4.y + (tcu - tsq2 + t) * r1.y + (tcu - tsq) * r4.y);
}
void dHermite(Common::Point p1, Common::Point p4, Common::Point r1, Common::Point r4, int32 time, int32 duration, Common::Point &result) {
float t = (float)time / duration;
float t2 = t + t;
float t4 = t2 + t2;
float t6 = t4 + t2;
float tsq = t * t;
float tsq3 = tsq + tsq + tsq;
float tsq6 = tsq3 + tsq3;
result.x = (int16)((tsq6 - t6) * p1.x + (t6 - tsq6) * p4.x + (tsq3 - t4 + 1) * r1.x + (tsq3 - t2) * r4.x);
result.y = (int16)((tsq6 - t6) * p1.y + (t6 - tsq6) * p4.y + (tsq3 - t4 + 1) * r1.y + (tsq3 - t2) * r4.y);
}
} // End of namespace Pegasus
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