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Contents
package rhomobile.mapview;
import j2me.lang.MathEx;
public class MapTools {
private static final double LN2 = 0.693147180559945;
//================================================================
// Mathematical functions
// Sine of the a
public static double math_sin(double a) {
return Math.sin(a);
}
// Arc sine of the a
public static double math_asin(double a) {
//return MathUtilities.asin(a);
return MathEx.asin(a);
}
// Exponential (base E ~ 2.718281828) of a
public static double math_exp(double a) {
//return MathUtilities.exp(a);
return MathEx.exp(a);
}
// Natural logarithm (base E ~ 2.718281828) of a
public static double math_ln(double a) {
//return MathUtilities.log(a);
return MathEx.log(a);
}
// Binary logarithm (base 2) of a
public static double math_log2(double a) {
return math_ln(a)/LN2;
}
// 2 raised to the power of n
public static long math_pow2(int n) {
long ret;
for (ret = 1; n > 0; --n)
ret *= 2;
return ret;
}
public static double math_pow2d(int n) {
double ret = 1.0;
if (n < 0) {
for (; n < 0; ++n) {
ret /= 2;
}
}
if (n > 0) {
for (; n > 0; --n) {
ret *= 2;
}
}
return ret;
}
public static double math_sqrt(double a) {
return MathEx.pow(a, 0.5);
}
// Hyperbolic tangent of a
public static double math_tanh(double a) {
double epx = math_exp(a);
double emx = math_exp(-a);
return (epx - emx)/(epx + emx);
}
// Hyperbolic arc tangent of a
public static double math_atanh(double a) {
return 0.5*math_ln((1 + a)/(1 - a));
}
}
Version data entries
32 entries across 32 versions & 1 rubygems