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Cosmetic changes + "final" keyword.

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git-svn-id: https://svn.apache.org/repos/asf/commons/proper/math/trunk@1242317 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Gilles Sadowski 2012-02-09 13:18:06 +00:00
parent 6c750f8580
commit 5c72fa771e
1 changed files with 29 additions and 27 deletions
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56
src/main/java/org/apache/commons/math/util/FastMath.java
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@ -342,6 +342,8 @@ public class FastMath {
private static final double F_5_6 = 5d / 6d;
/** Constant: {@value}. */
private static final double F_1_2 = 1d / 2d;
/** Constant: {@value}. */
private static final double F_1_4 = 1d / 4d;
/**
* Private Constructor
@ -2448,7 +2450,7 @@ public class FastMath {
}
if (xa > 1.633123935319537E16) { // Very large input
return (negate ^ leftPlane) ? (-Math.PI/2.0) : (Math.PI/2.0);
return (negate ^ leftPlane) ? (-Math.PI * F_1_2) : (Math.PI * F_1_2);
}
/* Estimate the closest tabulated arctan value, compute eps = xa-tangentTable */
@ -2583,16 +2585,16 @@ public class FastMath {
* @return phase angle of point (x,y) between {@code -PI} and {@code PI}
*/
public static double atan2(double y, double x) {
if (x !=x || y != y) {
if (x != x || y != y) {
return Double.NaN;
}
if (y == 0.0) {
double result = x*y;
double invx = 1.0/x;
double invy = 1.0/y;
if (y == 0) {
final double result = x * y;
final double invx = 1d / x;
final double invy = 1d / y;
if (invx == 0.0) { // X is infinite
if (invx == 0) { // X is infinite
if (x > 0) {
return y; // return +/- 0.0
} else {
@ -2600,8 +2602,8 @@ public class FastMath {
}
}
if (x < 0.0 || invx < 0.0) {
if (y < 0.0 || invy < 0.0) {
if (x < 0 || invx < 0) {
if (y < 0 || invy < 0) {
return -Math.PI;
} else {
return Math.PI;
@ -2615,45 +2617,45 @@ public class FastMath {
if (y == Double.POSITIVE_INFINITY) {
if (x == Double.POSITIVE_INFINITY) {
return Math.PI/4.0;
return Math.PI * F_1_4;
}
if (x == Double.NEGATIVE_INFINITY) {
return Math.PI * F_3_4;
}
return Math.PI/2.0;
return Math.PI * F_1_2;
}
if (y == Double.NEGATIVE_INFINITY) {
if (x == Double.POSITIVE_INFINITY) {
return -Math.PI/4.0;
return -Math.PI * F_1_4;
}
if (x == Double.NEGATIVE_INFINITY) {
return -Math.PI * F_3_4;
}
return -Math.PI/2.0;
return -Math.PI * F_1_2;
}
if (x == Double.POSITIVE_INFINITY) {
if (y > 0.0 || 1/y > 0.0) {
return 0.0;
if (y > 0 || 1 / y > 0) {
return 0d;
}
if (y < 0.0 || 1/y < 0.0) {
return -0.0;
if (y < 0 || 1 / y < 0) {
return -0d;
}
}
if (x == Double.NEGATIVE_INFINITY)
{
if (y > 0.0 || 1/y > 0.0) {
if (y > 0.0 || 1 / y > 0.0) {
return Math.PI;
}
if (y < 0.0 || 1/y < 0.0) {
if (y < 0 || 1 / y < 0) {
return -Math.PI;
}
}
@ -2661,17 +2663,17 @@ public class FastMath {
// Neither y nor x can be infinite or NAN here
if (x == 0) {
if (y > 0.0 || 1/y > 0.0) {
return Math.PI/2.0;
if (y > 0 || 1 / y > 0) {
return Math.PI * F_1_2;
}
if (y < 0.0 || 1/y < 0.0) {
return -Math.PI/2.0;
if (y < 0 || 1 / y < 0) {
return -Math.PI * F_1_2;
}
}
// Compute ratio r = y/x
final double r = y/x;
final double r = y / x;
if (Double.isInfinite(r)) { // bypass calculations that can create NaN
return atan(r, 0, x < 0);
}
@ -2685,16 +2687,16 @@ public class FastMath {
rb += (y - ra * xa - ra * xb - rb * xa - rb * xb) / x;
double temp = ra + rb;
final double temp = ra + rb;
rb = -(temp - ra - rb);
ra = temp;
if (ra == 0) { // Fix up the sign so atan works correctly
ra = copySign(0.0, y);
ra = copySign(0d, y);
}
// Call atan
double result = atan(ra, rb, x < 0);
final double result = atan(ra, rb, x < 0);
return result;
}