1cfd74d65d832137e20e193c960802afba73b5d38sm/* 23c1e67e433728684b5f228c5d4f3e5b1457bb271sm * Copyright (C) 2010 The Android Open Source Project 3cfd74d65d832137e20e193c960802afba73b5d38sm * 4cfd74d65d832137e20e193c960802afba73b5d38sm * Licensed under the Apache License, Version 2.0 (the "License"); 5cfd74d65d832137e20e193c960802afba73b5d38sm * you may not use this file except in compliance with the License. 6cfd74d65d832137e20e193c960802afba73b5d38sm * You may obtain a copy of the License at 7cfd74d65d832137e20e193c960802afba73b5d38sm * 8cfd74d65d832137e20e193c960802afba73b5d38sm * http://www.apache.org/licenses/LICENSE-2.0 9cfd74d65d832137e20e193c960802afba73b5d38sm * 10cfd74d65d832137e20e193c960802afba73b5d38sm * Unless required by applicable law or agreed to in writing, software 11cfd74d65d832137e20e193c960802afba73b5d38sm * distributed under the License is distributed on an "AS IS" BASIS, 12cfd74d65d832137e20e193c960802afba73b5d38sm * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13cfd74d65d832137e20e193c960802afba73b5d38sm * See the License for the specific language governing permissions and 14cfd74d65d832137e20e193c960802afba73b5d38sm * limitations under the License. 15cfd74d65d832137e20e193c960802afba73b5d38sm */ 16cfd74d65d832137e20e193c960802afba73b5d38sm 17cfd74d65d832137e20e193c960802afba73b5d38smpackage com.replica.replicaisland; 18cfd74d65d832137e20e193c960802afba73b5d38sm 19cfd74d65d832137e20e193c960802afba73b5d38smpublic final class Lerp { 20cfd74d65d832137e20e193c960802afba73b5d38sm 21cfd74d65d832137e20e193c960802afba73b5d38sm public static float lerp(float start, float target, float duration, float timeSinceStart) 22cfd74d65d832137e20e193c960802afba73b5d38sm { 23cfd74d65d832137e20e193c960802afba73b5d38sm float value = start; 24cfd74d65d832137e20e193c960802afba73b5d38sm if (timeSinceStart > 0.0f && timeSinceStart < duration) 25cfd74d65d832137e20e193c960802afba73b5d38sm { 26cfd74d65d832137e20e193c960802afba73b5d38sm final float range = target - start; 27cfd74d65d832137e20e193c960802afba73b5d38sm final float percent = timeSinceStart / duration; 28cfd74d65d832137e20e193c960802afba73b5d38sm value = start + (range * percent); 29cfd74d65d832137e20e193c960802afba73b5d38sm } 30cfd74d65d832137e20e193c960802afba73b5d38sm else if (timeSinceStart >= duration) 31cfd74d65d832137e20e193c960802afba73b5d38sm { 32cfd74d65d832137e20e193c960802afba73b5d38sm value = target; 33cfd74d65d832137e20e193c960802afba73b5d38sm } 34cfd74d65d832137e20e193c960802afba73b5d38sm return value; 35cfd74d65d832137e20e193c960802afba73b5d38sm } 36cfd74d65d832137e20e193c960802afba73b5d38sm 37cfd74d65d832137e20e193c960802afba73b5d38sm public static float ease(float start, float target, float duration, float timeSinceStart) 38cfd74d65d832137e20e193c960802afba73b5d38sm { 39cfd74d65d832137e20e193c960802afba73b5d38sm float value = start; 40cfd74d65d832137e20e193c960802afba73b5d38sm if (timeSinceStart > 0.0f && timeSinceStart < duration) 41cfd74d65d832137e20e193c960802afba73b5d38sm { 42cfd74d65d832137e20e193c960802afba73b5d38sm final float range = target - start; 43cfd74d65d832137e20e193c960802afba73b5d38sm final float percent = timeSinceStart / (duration / 2.0f); 44cfd74d65d832137e20e193c960802afba73b5d38sm if (percent < 1.0f) 45cfd74d65d832137e20e193c960802afba73b5d38sm { 46cfd74d65d832137e20e193c960802afba73b5d38sm value = start + ((range / 2.0f) * percent * percent * percent); 47cfd74d65d832137e20e193c960802afba73b5d38sm } 48cfd74d65d832137e20e193c960802afba73b5d38sm else 49cfd74d65d832137e20e193c960802afba73b5d38sm { 50cfd74d65d832137e20e193c960802afba73b5d38sm final float shiftedPercent = percent - 2.0f; 51cfd74d65d832137e20e193c960802afba73b5d38sm value = start + ((range / 2.0f) * 52cfd74d65d832137e20e193c960802afba73b5d38sm ((shiftedPercent * shiftedPercent * shiftedPercent) + 2.0f)); 53cfd74d65d832137e20e193c960802afba73b5d38sm } 54cfd74d65d832137e20e193c960802afba73b5d38sm } 55cfd74d65d832137e20e193c960802afba73b5d38sm else if (timeSinceStart >= duration) 56cfd74d65d832137e20e193c960802afba73b5d38sm { 57cfd74d65d832137e20e193c960802afba73b5d38sm value = target; 58cfd74d65d832137e20e193c960802afba73b5d38sm } 59cfd74d65d832137e20e193c960802afba73b5d38sm return value; 60cfd74d65d832137e20e193c960802afba73b5d38sm } 61cfd74d65d832137e20e193c960802afba73b5d38sm} 62