X-Git-Url: https://gerrit.simantics.org/r/gitweb?a=blobdiff_plain;f=org.simantics.g3d%2Fsrc%2Forg%2Fsimantics%2Fg3d%2Fmath%2FMathTools.java;h=b9941c8b94a774605ed91fd55752150fe3aab88d;hb=refs%2Fchanges%2F88%2F3688%2F2;hp=aa8b0551fdc845ac8db698724f6ad38d7d612b76;hpb=b0e0a3863a65fa5351d8a1207f94ca37135c675a;p=simantics%2F3d.git

diff --git a/org.simantics.g3d/src/org/simantics/g3d/math/MathTools.java b/org.simantics.g3d/src/org/simantics/g3d/math/MathTools.java
index aa8b0551..b9941c8b 100644
--- a/org.simantics.g3d/src/org/simantics/g3d/math/MathTools.java
+++ b/org.simantics.g3d/src/org/simantics/g3d/math/MathTools.java
@@ -1010,4 +1010,25 @@ public class MathTools {
 		mat.m23 = -(f+n)/(f-n);
 		return mat;
 	}
+
+	/**
+	 * Round the number to a given number of decimals, if the rounded result contains at least three
+	 * zero trailing decimal places within the rounded result.
+	 */
+	public static double round(double value, int nsig) {
+		if (Math.abs(value) < NEAR_ZERO)
+			return 0.0;
+		
+		int decimals = (int) Math.round(Math.log10(value));
+		int shift = nsig - decimals;
+		double multiplier = Math.pow(10.0, shift);
+		long roundedValue = Math.round(value * multiplier);
+		if (roundedValue % 1000 == 0) {
+			// Rounding results in at least three zeroes at the end
+			return roundedValue / multiplier;
+		} else {
+			// Number was not close to a shorter decimal representation, return it as is
+			return value;
+		}
+	}
 }