gered/gdx-toolbox
1
0
Fork 0
Code Issues Pull requests Packages Projects Releases Wiki Activity

update floating-point comparison

Browse source 
using method detailed in http://realtimecollisiondetection.net/blog/?p=89
This commit is contained in:
Gered 2013-09-29 23:03:43 -04:00
parent c85410b885
commit fa6f1a07a4
1 changed files with 6 additions and 9 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

15
src/com/blarg/gdx/math/MathHelpers.java
View file

@ -9,7 +9,7 @@ public final class MathHelpers {
static final Vector2 v2tmpA = new Vector2(); static final Vector2 v2tmpA = new Vector2();
public static final float FLOAT_EPSILON = 1.401298E-45f; // smallest floating point value greater then zero public static final float FLOAT_EPSILON = 1.401298E-45f; // smallest floating point value greater then zero
public static final float EPSILON = 0.0000000001f; public static final float EPSILON = 0.000001f; //0.0000000001f;
public static final float UP_2D = 90.0f; public static final float UP_2D = 90.0f;
public static final float DOWN_2D = 270.0f; public static final float DOWN_2D = 270.0f;
@ -80,15 +80,12 @@ public final class MathHelpers {
return areAlmostEqual(a, b, EPSILON); return areAlmostEqual(a, b, EPSILON);
} }
public static boolean areAlmostEqual(float a, float b, float epsilon) public static boolean areAlmostEqual(float a, float b, float tolerance) {
{ return Math.abs(a - b) <= tolerance * Math.max(1.0f, Math.max(Math.abs(a), Math.abs(b)));
float diff = Math.abs(a - b); }
a = Math.abs(a);
b = Math.abs(b);
float largest = (b > a) ? b : a; public static boolean areAlmostEqual(float a, float b, float relativeTolerance, float absoluteTolerance) {
return Math.abs(a - b) <= Math.max(absoluteTolerance, relativeTolerance * Math.max(Math.abs(a), Math.abs(b)));
return (diff <= largest * epsilon);
} }
public static float fastInverseSqrt(float x) { public static float fastInverseSqrt(float x) {