Java tutorial
//package com.java2s; /* * Copyright (C) 2016 Peng fei Pan <sky@xiaopan.me> * * 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. */ import android.graphics.Rect; public class Main { @SuppressWarnings("unused") @Deprecated public static void mapping(int sourceWidth, int sourceHeight, int targetWidth, int targetHeight, Rect rect) { float widthScale = (float) sourceWidth / targetWidth; float heightScale = (float) sourceHeight / targetHeight; float finalScale = widthScale < heightScale ? widthScale : heightScale; int srcWidth = (int) (targetWidth * finalScale); int srcHeight = (int) (targetHeight * finalScale); int srcLeft = (sourceWidth - srcWidth) / 2; int srcTop = (sourceHeight - srcHeight) / 2; rect.set(srcLeft, srcTop, srcLeft + srcWidth, srcTop + srcHeight); } }