rotate And Mirror Bitmap - Android Graphics

Android examples for Graphics:Bitmap Rotate

  1. HOME
  2. Android
  3. Graphics
  4. Bitmap Rotate

Description

rotate And Mirror Bitmap

Demo Code

/*//from  w ww . j a v a2s .c  o m
 * Copyright (C) 2009 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.Bitmap;
import android.graphics.Matrix;

public class Main {
  public static Bitmap rotateAndMirror(Bitmap b, int degrees, boolean mirror) {
    if ((degrees != 0 || mirror) && b != null) {
      Matrix m = new Matrix();
      // Mirror first.
      // horizontal flip + rotation = -rotation + horizontal flip
      if (mirror) {
        m.postScale(-1, 1);
        degrees = (degrees + 360) % 360;
        if (degrees == 0 || degrees == 180) {
          m.postTranslate(b.getWidth(), 0);
        } else if (degrees == 90 || degrees == 270) {
          m.postTranslate(b.getHeight(), 0);
        } else {
          throw new IllegalArgumentException("Invalid degrees=" + degrees);
        }
      }
      if (degrees != 0) {
        // clockwise
        m.postRotate(degrees, (float) b.getWidth() / 2, (float) b.getHeight() / 2);
      }

      try {
        Bitmap b2 = Bitmap.createBitmap(b, 0, 0, b.getWidth(), b.getHeight(), m, true);
        if (b != b2) {
          b.recycle();
          b = b2;
        }
      } catch (OutOfMemoryError ex) {
        // We have no memory to rotate. Return the original bitmap.
      }
    }
    return b;
  }
}

Related Tutorials