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/*
* Copyright (C) 2010 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.caliper.util;
import com.google.common.annotations.GwtCompatible;
@GwtCompatible
public class LinearTranslation {
// y = mx + b
private final double m;
private final double b;
// TODO(kevinb): why so high? why even check this at all?
private static final double EQUALITY_TOLERANCE = 1.0E-6;
/**
* Constructs a linear translation for which {@code translate(in1) == out1}
* and {@code translate(in2) == out2}.
*
* @throws IllegalArgumentException if {@code in1 == in2}
*/
public LinearTranslation(double in1, double out1, double in2, double out2) {
if (Math.abs(in1 - in2) < EQUALITY_TOLERANCE) {
throw new IllegalArgumentException("in1 and in2 are approximately equal");
}
double divisor = in1 - in2;
this.m = (out1 - out2) / divisor;
this.b = (in1 * out2 - in2 * out1) / divisor;
}
public double translate(double in) {
return m * in + b;
}
}
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