public class MainActivity extends AppCompatActivity {
private ImageView view2,view3,view4;
@Override
protected void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
view2 = (ImageView) findViewById(R.id.iv2);
view3 = (ImageView) findViewById(R.id.iv3);
view4 = (ImageView) findViewById(R.id.iv4);
Bitmap bitmap = BitmapFactory.decodeResource(getResources(),R.mipmap.i004);
/**
* 旋转中心为(0,0)
*/
Matrix matrix = getMatrix();
Bitmap bit = getBitmap(bitmap, matrix);
view2.setImageBitmap(bit);
/**
* 旋转中心为(0,height/2)
*/
matrix = getMatrix();
matrix.preTranslate(0, -bitmap.getHeight() / 2);
matrix.postTranslate(0, bitmap.getHeight() / 2);
bit = getBitmap(bitmap, matrix);
view3.setImageBitmap(bit);
/**
* 旋转中心为(0,height)
*/
matrix = getMatrix();
matrix.preTranslate(0, -bitmap.getHeight());
matrix.postTranslate(0,bitmap.getHeight());
bit = getBitmap(bitmap, matrix);
view4.setImageBitmap(bit);
}
private Bitmap getBitmap(Bitmap bitmap, Matrix matrix) {
return Bitmap.createBitmap(bitmap,0,0,bitmap.getWidth(),bitmap.getHeight(),matrix,true);
}
@NonNull
private Matrix getMatrix(){
Matrix matrix = new Matrix();
Camera camera = new Camera();
camera.save();
camera.rotateY(45);
camera.getMatrix(matrix);
camera.restore();
return matrix;
}
}
matrix.preTranslate(0, -bitmap.getHeight()); matrix.postTranslate(0,bitmap.getHeight());
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