Back to project page Pedometer.
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Apache License
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/* * Copyright (C) 2010 The Android Open Source Project */*ww w . j av a 2 s.co m*/ * 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 integer * values that represent ARGB colors. */ public class ArgbEvaluator implements TypeEvaluator { /** * This function returns the calculated in-between value for a color * given integers that represent the start and end values in the four * bytes of the 32-bit int. Each channel is separately linearly interpolated * and the resulting calculated values are recombined into the return value. * * @param fraction The fraction from the starting to the ending values * @param startValue A 32-bit int value representing colors in the * separate bytes of the parameter * @param endValue A 32-bit int value representing colors in the * separate bytes of the parameter * @return A value that is calculated to be the linearly interpolated * result, derived by separating the start and end values into separate * color channels and interpolating each one separately, recombining the * resulting values in the same way. */ public Object evaluate(float fraction, Object startValue, Object endValue) { int startInt = (Integer) startValue; int startA = (startInt >> 24); int startR = (startInt >> 16) & 0xff; int startG = (startInt >> 8) & 0xff; int startB = startInt & 0xff; int endInt = (Integer) endValue; int endA = (endInt >> 24); int endR = (endInt >> 16) & 0xff; int endG = (endInt >> 8) & 0xff; int endB = endInt & 0xff; return (int)((startA + (int)(fraction * (endA - startA))) << 24) | (int)((startR + (int)(fraction * (endR - startR))) << 16) | (int)((startG + (int)(fraction * (endG - startG))) << 8) | (int)((startB + (int)(fraction * (endB - startB)))); } }