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.photoeditor.actions; 18 19 import android.graphics.Matrix; 20 import android.graphics.RectF; 21 import android.view.View; 22 import android.view.ViewGroup; 23 24 import com.android.photoeditor.FilterStack; 25 import com.android.photoeditor.R; 26 import com.android.photoeditor.RectUtils; 27 import com.android.photoeditor.filters.RotateFilter; 28 29 /** 30 * An action handling rotate effect. 31 */ 32 public class RotateAction extends FilterAction { 33 34 private static final float DEFAULT_ANGLE = 0.0f; 35 private static final float DEFAULT_ROTATE_SPAN = 360.0f; 36 37 private RotateFilter filter; 38 private float rotateDegrees; 39 RotateAction(FilterStack filterStack, ViewGroup tools)40 public RotateAction(FilterStack filterStack, ViewGroup tools) { 41 super(filterStack, tools, R.string.rotate_tooltip); 42 } 43 44 @Override onBegin()45 public void onBegin() { 46 filter = new RotateFilter(); 47 rotateDegrees = 0; 48 49 final Matrix matrix = new Matrix(); 50 final RectF rotateBounds = new RectF(); 51 final RectF photoBounds = photoView.getPhotoBounds(); 52 53 // Directly transform photo-view instead of waiting for top-filter output callback. 54 rotateView.setOnAngleChangeListener(new RotateView.OnRotateChangeListener() { 55 56 @Override 57 public void onAngleChanged(float degrees, boolean fromUser){ 58 if (fromUser) { 59 rotateDegrees = degrees; 60 filter.setAngle(degrees); 61 notifyFilterChanged(filter, false); 62 transformPhotoView(degrees); 63 } 64 } 65 66 @Override 67 public void onStartTrackingTouch() { 68 // no-op 69 } 70 71 @Override 72 public void onStopTrackingTouch() { 73 if (roundFilterRotationDegrees()) { 74 notifyFilterChanged(filter, false); 75 transformPhotoView(rotateDegrees); 76 rotateView.setRotatedAngle(rotateDegrees); 77 } 78 } 79 80 private void transformPhotoView(float degrees) { 81 matrix.reset(); 82 rotateBounds.set(photoBounds); 83 RectUtils.postRotateMatrix(degrees, rotateBounds, matrix); 84 float scale = RectUtils.getDisplayScale(rotateBounds, photoView); 85 matrix.postScale(scale, scale); 86 photoView.transformDisplay(matrix); 87 } 88 }); 89 rotateView.setGridBounds(null); 90 rotateView.setRotatedAngle(DEFAULT_ANGLE); 91 rotateView.setRotateSpan(DEFAULT_ROTATE_SPAN); 92 rotateView.setVisibility(View.VISIBLE); 93 } 94 95 @Override onEnd()96 public void onEnd() { 97 // Round the current rotation degrees in case rotation tracking has not stopped yet. 98 roundFilterRotationDegrees(); 99 notifyFilterChanged(filter, true); 100 } 101 102 /** 103 * Rounds filter rotation degrees to multiples of 90 degrees. 104 * 105 * @return true if the rotation degrees has been changed. 106 */ roundFilterRotationDegrees()107 private boolean roundFilterRotationDegrees() { 108 if (rotateDegrees % 90 != 0) { 109 rotateDegrees = Math.round(rotateDegrees / 90) * 90; 110 filter.setAngle(rotateDegrees); 111 return true; 112 } 113 return false; 114 } 115 } 116