some changes

src/main/java/org/solovyev/common/math/DiscreteNormalizer.java

@@ -0,0 +1,59 @@
+package org.solovyev.common.math;
+
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * User: serso
+ * Date: 9/20/11
+ * Time: 5:42 PM
+ */
+public class DiscreteNormalizer implements Normalizer {
+
+	@NotNull
+	private final LinearNormalizer linearNormalizer;
+
+	private final double min;
+
+	private final double step;
+
+	public DiscreteNormalizer(double min, double max, int steps) {
+		assert min <= max;
+		assert steps > 1;
+
+		this.linearNormalizer = new LinearNormalizer(min, max);
+
+		this.step = linearNormalizer.normalize((max - min) / (steps - 1));
+		this.min = linearNormalizer.normalize(min);
+	}
+
+	public DiscreteNormalizer(double min, double max, double step) {
+		assert min <= max;
+		assert step > 0;
+
+		this.linearNormalizer = new LinearNormalizer(min, max);
+
+		this.step = linearNormalizer.normalize(step);
+		this.min = linearNormalizer.normalize(min);
+	}
+
+	@Override
+	public double normalize(double value) {
+		double normalizedValue = linearNormalizer.normalize(value);
+
+		double result = min;
+		while (true) {
+			if ( result + step > normalizedValue ) {
+				break;
+			} else {
+				result += step;
+			}
+		}
+
+		return result;
+	}
+
+	@Override
+	public double denormalize(double value) {
+		return linearNormalizer.denormalize(value);
+	}
+}

src/main/java/org/solovyev/common/math/LinearNormalizer.java

@@ -11,7 +11,7 @@ package org.solovyev.common.math;
 * Date: 9/19/11
 * Time: 9:31 PM
 */
-public class LinearNormalizer {
+public class LinearNormalizer implements Normalizer {
 
 	private final double min;
 	private final double max;
@@ -21,6 +21,7 @@ public class LinearNormalizer {
 		this.max = max;
 	}
 
+	@Override
 	public double normalize(double value){
 		if ((max - min) != 0d) {
 			return (value - min) / (max - min);
@@ -29,6 +30,7 @@ public class LinearNormalizer {
 		}
 	}
 
+	@Override
 	public double denormalize(double value){
 		return min + value * (max - min);
 	}

src/main/java/org/solovyev/common/math/Normalizer.java

@@ -0,0 +1,13 @@
+package org.solovyev.common.math;
+
+/**
+ * User: serso
+ * Date: 9/20/11
+ * Time: 5:30 PM
+ */
+public interface Normalizer {
+
+	double normalize(double value);
+
+	double denormalize(double value);
+}