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      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.test.hwui;
     18 
     19 import android.app.Activity;
     20 import android.content.Context;
     21 import android.graphics.Bitmap;
     22 import android.graphics.BitmapFactory;
     23 import android.graphics.Camera;
     24 import android.graphics.Canvas;
     25 import android.graphics.Matrix;
     26 import android.os.Bundle;
     27 import android.view.View;
     28 
     29 @SuppressWarnings({"UnusedDeclaration"})
     30 public class Transform3dActivity extends Activity {
     31     @Override
     32     protected void onCreate(Bundle savedInstanceState) {
     33         super.onCreate(savedInstanceState);
     34         final Transform3dView view = new Transform3dView(this);
     35         setContentView(view);
     36     }
     37 
     38     static class Transform3dView extends View {
     39         private final Bitmap mBitmap1;
     40         private Camera mCamera;
     41         private Matrix mMatrix;
     42 
     43         Transform3dView(Context c) {
     44             super(c);
     45 
     46             mBitmap1 = BitmapFactory.decodeResource(c.getResources(), R.drawable.sunset1);
     47             mCamera = new Camera();
     48             mMatrix = new Matrix();
     49         }
     50 
     51         @Override
     52         protected void onDraw(Canvas canvas) {
     53             super.onDraw(canvas);
     54 
     55             canvas.drawARGB(255, 255, 255, 255);
     56 
     57             final float centerX = getWidth() / 2.0f - mBitmap1.getWidth() / 2.0f;
     58             final float centerY = getHeight() / 2.0f - mBitmap1.getHeight() / 2.0f;
     59             final Camera camera = mCamera;
     60 
     61             final Matrix matrix = mMatrix;
     62 
     63             rotate(centerX, centerY, camera, matrix, 32.0f);
     64             drawBitmap(canvas, centerX, centerY, 0.0f, matrix);
     65 
     66             rotate(centerX, centerY, camera, matrix, 12.0f);
     67             drawBitmap(canvas, centerX, centerY, -mBitmap1.getWidth(), matrix);
     68 
     69             rotate(centerX, centerY, camera, matrix, 52.0f);
     70             drawBitmap(canvas, centerX, centerY, mBitmap1.getWidth(), matrix);
     71 
     72             rotate(centerX, centerY, camera, matrix, 122.0f);
     73             drawBitmap(canvas, centerX, centerY, mBitmap1.getWidth() * 2.0f, matrix);
     74 
     75         }
     76 
     77         private void drawBitmap(Canvas canvas, float centerX, float centerY, float offset,
     78                 Matrix matrix) {
     79             canvas.save();
     80             canvas.translate(offset, 0.0f);
     81             canvas.concat(matrix);
     82             canvas.drawBitmap(mBitmap1, centerX, centerY, null);
     83             canvas.restore();
     84         }
     85 
     86         private void rotate(float centerX, float centerY, Camera camera,
     87                 Matrix matrix, float angle) {
     88             camera.save();
     89             camera.rotateY(angle);
     90             camera.getMatrix(matrix);
     91             camera.restore();
     92 
     93             matrix.preTranslate(-centerX, -centerY);
     94             matrix.postTranslate(centerX, centerY);
     95         }
     96     }
     97 }
     98