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math/utils.h

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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.
+ *
+ * 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/>.
+ *
+ */
+
+#ifndef MATH_UTILS_H
+#define MATH_UTILS_H
+
+#include "common/scummsys.h"
+
+#ifndef FLT_MIN
+	#define FLT_MIN 1E-37f
+#endif
+
+#ifndef FLT_MAX
+	#define FLT_MAX 1E+37f
+#endif
+
+namespace Math {
+
+/** A complex number. */
+struct Complex {
+	float re, im;
+};
+
+/* Math::epsilon is a constant with a small value which is used for comparing
+ * floating point numbers.
+ *
+ * The value is based on the previous hard-coded numbers in
+ * Line2d.cpp. Smaller numbers could be used unless they are
+ * smaller than the float granularity.
+ */
+static const float epsilon = 0.0001f;
+
+// Round a number towards zero
+// Input and Output type can be different
+template<class InputT, class OutputT>
+inline OutputT trunc(InputT x) {
+	return (x > 0) ? floor(x) : ceil(x);
+}
+
+// Round a number towards zero
+// Input and Output type are the same
+template<class T>
+inline T trunc(T x) {
+	return trunc<T,T>(x);
+}
+
+// Convert radians to degrees
+// Input and Output type can be different
+// Upconvert everything to floats
+template<class InputT, class OutputT>
+inline OutputT rad2deg(InputT rad) {
+	return (OutputT)( (float)rad * (float)57.2957795130823); // 180.0/M_PI = 57.2957795130823
+}
+
+// Handle the case differently when the input type is double
+template<class OutputT>
+inline OutputT rad2deg(double rad) {
+	return (OutputT)( rad * 57.2957795130823);
+}
+
+// Convert radians to degrees
+// Input and Output type are the same
+template<class T>
+inline T rad2deg(T rad) {
+	return rad2deg<T,T>(rad);
+}
+
+// Convert degrees to radians
+// Input and Output type can be different
+// Upconvert everything to floats
+template<class InputT, class OutputT>
+inline OutputT deg2rad(InputT deg) {
+	return (OutputT)( (float)deg * (float)0.0174532925199433); // M_PI/180.0 = 0.0174532925199433
+}
+
+// Handle the case differently when the input type is double
+template<>
+inline double deg2rad<double, double>(double deg) {
+	return ( deg * 0.0174532925199433);
+}
+
+// Convert degrees to radians
+// Input and Output type are the same
+template<class T>
+inline T deg2rad(T deg) {
+	return deg2rad<T,T>(deg);
+}
+
+template<class T>
+inline T hypotenuse(T xv, T yv) {
+	return (T)sqrt((double)(xv * xv + yv * yv));
+}
+
+inline float square(float x) {
+	return x * x;
+}
+
+}
+
+#endif