Android Open Source - ViewPagerTransforms Tablet Transformer

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Back to project page ViewPagerTransforms.

License

The source code is released under:

Apache License

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Java Source Code

/*
 * Copyright 2014 Toxic Bakery/*from  w w w . j  av  a 2s .  c o m*/
 *
 * 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.
 */

package com.ToxicBakery.viewpager.transforms;

import android.graphics.Camera;
import android.graphics.Matrix;
import android.view.View;

public class TabletTransformer extends ABaseTransformer {

  private static final Matrix OFFSET_MATRIX = new Matrix();
  private static final Camera OFFSET_CAMERA = new Camera();
  private static final float[] OFFSET_TEMP_FLOAT = new float[2];

  @Override
  protected void onTransform(View view, float position) {
    final float rotation = (position < 0 ? 30f : -30f) * Math.abs(position);

    view.setTranslationX(getOffsetXForRotation(rotation, view.getWidth(), view.getHeight()));
    view.setPivotX(view.getWidth() * 0.5f);
    view.setPivotY(0);
    view.setRotationY(rotation);
  }

  protected static final float getOffsetXForRotation(float degrees, int width, int height) {
    OFFSET_MATRIX.reset();
    OFFSET_CAMERA.save();
    OFFSET_CAMERA.rotateY(Math.abs(degrees));
    OFFSET_CAMERA.getMatrix(OFFSET_MATRIX);
    OFFSET_CAMERA.restore();

    OFFSET_MATRIX.preTranslate(-width * 0.5f, -height * 0.5f);
    OFFSET_MATRIX.postTranslate(width * 0.5f, height * 0.5f);
    OFFSET_TEMP_FLOAT[0] = width;
    OFFSET_TEMP_FLOAT[1] = height;
    OFFSET_MATRIX.mapPoints(OFFSET_TEMP_FLOAT);
    return (width - OFFSET_TEMP_FLOAT[0]) * (degrees > 0.0f ? 1.0f : -1.0f);
  }

}

Java Source Code List