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/*
* gleem -- OpenGL Extremely Easy-To-Use Manipulators.
* Copyright (C) 1998-2003 Kenneth B. Russell (kbrussel@alum.mit.edu)
*
* Copying, distribution and use of this software in source and binary
* forms, with or without modification, is permitted provided that the
* following conditions are met:
*
* Distributions of source code must reproduce the copyright notice,
* this list of conditions and the following disclaimer in the source
* code header files; and Distributions of binary code must reproduce
* the copyright notice, this list of conditions and the following
* disclaimer in the documentation, Read me file, license file and/or
* other materials provided with the software distribution.
*
* The names of Sun Microsystems, Inc. ("Sun") and/or the copyright
* holder may not be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED "AS IS," WITHOUT A WARRANTY OF ANY
* KIND. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
* WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE, NON-INTERFERENCE, ACCURACY OF
* INFORMATIONAL CONTENT OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. THE
* COPYRIGHT HOLDER, SUN AND SUN'S LICENSORS SHALL NOT BE LIABLE FOR
* ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
* DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL THE
* COPYRIGHT HOLDER, SUN OR SUN'S LICENSORS BE LIABLE FOR ANY LOST
* REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
* CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
* REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
* INABILITY TO USE THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
* OF SUCH DAMAGES. YOU ACKNOWLEDGE THAT THIS SOFTWARE IS NOT
* DESIGNED, LICENSED OR INTENDED FOR USE IN THE DESIGN, CONSTRUCTION,
* OPERATION OR MAINTENANCE OF ANY NUCLEAR FACILITY. THE COPYRIGHT
* HOLDER, SUN AND SUN'S LICENSORS DISCLAIM ANY EXPRESS OR IMPLIED
* WARRANTY OF FITNESS FOR SUCH USES.
*/
package gleem.linalg;
/** Utility math routines. */
public class MathUtil {
/** A "close to zero" float epsilon value for use */
public static final float FLT_EPSILON = 1.19209290e-07f;
/** A "close to zero" double epsilon value for use */
public static final double EPSILON = 2.220446049250313E-16d;
/** A close, but not quite, zero float epsilon value for use */
public static final float ZERO_TOLERANCE = 0.0001f;
/** Makes an arbitrary vector perpendicular to <B>src</B> and
inserts it into <B>dest</B>. Returns false if the source vector
was equal to (0, 0, 0). */
public static boolean makePerpendicular(Vec3f src,
Vec3f dest) {
if ((src.x() == 0.0f) && (src.y() == 0.0f) && (src.z() == 0.0f)) {
return false;
}
if (src.x() != 0.0f) {
if (src.y() != 0.0f) {
dest.set(-src.y(), src.x(), 0.0f);
} else {
dest.set(-src.z(), 0.0f, src.x());
}
} else {
dest.set(1.0f, 0.0f, 0.0f);
}
return true;
}
/** Returns 1 if the sign of the given argument is positive; -1 if
negative; 0 if 0. */
public static int sgn(float f) {
if (f > 0) {
return 1;
} else if (f < 0) {
return -1;
}
return 0;
}
/** Clamps argument between min and max values. */
public static float clamp(float val, float min, float max) {
if (val < min) return min;
if (val > max) return max;
return val;
}
/** Clamps argument between min and max values. */
public static int clamp(int val, int min, int max) {
if (val < min) return min;
if (val > max) return max;
return val;
}
}
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