mirror of
https://github.com/classilla/tenfourfox.git
synced 2025-02-08 01:31:00 +00:00
42 lines
1.9 KiB
Java
Executable File
42 lines
1.9 KiB
Java
Executable File
/*
|
|
* Copyright (C) 2010 The Android Open Source Project
|
|
*
|
|
* 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.nineoldandroids.animation;
|
|
|
|
/**
|
|
* This evaluator can be used to perform type interpolation between <code>float</code> values.
|
|
*/
|
|
public class FloatEvaluator implements TypeEvaluator<Number> {
|
|
|
|
/**
|
|
* This function returns the result of linearly interpolating the start and end values, with
|
|
* <code>fraction</code> representing the proportion between the start and end values. The
|
|
* calculation is a simple parametric calculation: <code>result = x0 + t * (v1 - v0)</code>,
|
|
* where <code>x0</code> is <code>startValue</code>, <code>x1</code> is <code>endValue</code>,
|
|
* and <code>t</code> is <code>fraction</code>.
|
|
*
|
|
* @param fraction The fraction from the starting to the ending values
|
|
* @param startValue The start value; should be of type <code>float</code> or
|
|
* <code>Float</code>
|
|
* @param endValue The end value; should be of type <code>float</code> or <code>Float</code>
|
|
* @return A linear interpolation between the start and end values, given the
|
|
* <code>fraction</code> parameter.
|
|
*/
|
|
public Float evaluate(float fraction, Number startValue, Number endValue) {
|
|
float startFloat = startValue.floatValue();
|
|
return startFloat + fraction * (endValue.floatValue() - startFloat);
|
|
}
|
|
} |