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engines/pegasus/neighborhood/mars/hermite.cpp

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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 3 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, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#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