Java tutorial
//package com.java2s; /* * Copyright (C) 2013 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. */ import android.graphics.Matrix; import android.graphics.RectF; public class Main { public static boolean setImageToScreenMatrix(Matrix dst, RectF image, RectF screen, int rotation) { RectF rotatedImage = new RectF(); dst.setRotate(rotation, image.centerX(), image.centerY()); if (!dst.mapRect(rotatedImage, image)) { return false; // fails for rotations that are not multiples of 90 // degrees } boolean rToR = dst.setRectToRect(rotatedImage, screen, Matrix.ScaleToFit.CENTER); boolean rot = dst.preRotate(rotation, image.centerX(), image.centerY()); return rToR && rot; } }