1 /* 2 * Copyright (C) 2010 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.gallery3d.photoeditor.actions; 18 19 import android.content.Context; 20 import android.graphics.Matrix; 21 import android.graphics.PointF; 22 import android.graphics.RectF; 23 import android.util.AttributeSet; 24 import android.view.View; 25 26 /** 27 * Full-screen tool view that gets photo display bounds and maps positions on photo display bounds 28 * back to exact coordinates on photo. 29 */ 30 abstract class FullscreenToolView extends View { 31 32 protected final RectF displayBounds = new RectF(); 33 private final Matrix photoMatrix = new Matrix(); 34 private RectF photoBounds; 35 FullscreenToolView(Context context, AttributeSet attrs)36 public FullscreenToolView(Context context, AttributeSet attrs) { 37 super(context, attrs); 38 } 39 40 /** 41 * Photo bounds must be set before onSizeChanged() and all other instance methods are invoked. 42 */ setPhotoBounds(RectF photoBounds)43 public void setPhotoBounds(RectF photoBounds) { 44 this.photoBounds = photoBounds; 45 } 46 47 @Override onSizeChanged(int w, int h, int oldw, int oldh)48 protected void onSizeChanged(int w, int h, int oldw, int oldh) { 49 super.onSizeChanged(w, h, oldw, oldh); 50 51 displayBounds.setEmpty(); 52 photoMatrix.reset(); 53 if (photoBounds.isEmpty()) { 54 return; 55 } 56 57 // Assumes photo-view is also full-screen as this tool-view and centers/scales photo to fit. 58 Matrix matrix = new Matrix(); 59 if (matrix.setRectToRect(photoBounds, new RectF(0, 0, w, h), Matrix.ScaleToFit.CENTER)) { 60 matrix.mapRect(displayBounds, photoBounds); 61 } 62 63 matrix.invert(photoMatrix); 64 } 65 getPhotoWidth()66 protected float getPhotoWidth() { 67 return photoBounds.width(); 68 } 69 getPhotoHeight()70 protected float getPhotoHeight() { 71 return photoBounds.height(); 72 } 73 mapPhotoPoint(float x, float y, PointF dst)74 protected void mapPhotoPoint(float x, float y, PointF dst) { 75 if (photoBounds.isEmpty()) { 76 dst.set(0, 0); 77 } else { 78 float[] point = new float[] {x, y}; 79 photoMatrix.mapPoints(point); 80 dst.set(point[0] / photoBounds.width(), point[1] / photoBounds.height()); 81 } 82 } 83 mapPhotoRect(RectF src, RectF dst)84 protected void mapPhotoRect(RectF src, RectF dst) { 85 if (photoBounds.isEmpty()) { 86 dst.setEmpty(); 87 } else { 88 photoMatrix.mapRect(dst, src); 89 dst.set(dst.left / photoBounds.width(), dst.top / photoBounds.height(), 90 dst.right / photoBounds.width(), dst.bottom / photoBounds.height()); 91 } 92 } 93 } 94