BackgroundToForegroundTransformer.java

package com.tiger.quicknews.wedget.viewimage.Transformers;

import android.view.View;

import com.nineoldandroids.view.ViewHelper;

public class BackgroundToForegroundTransformer extends BaseTransformer {

    @Override
    protected void onTransform(View view, float position) {
        final float height = view.getHeight();
        final float width = view.getWidth();
        final float scale = min(position < 0 ? 1f : Math.abs(1f - position), 0.5f);

        ViewHelper.setScaleX(view, scale);
        ViewHelper.setScaleY(view, scale);
        ViewHelper.setPivotX(view, width * 0.5f);
        ViewHelper.setPivotY(view, height * 0.5f);
        ViewHelper.setTranslationX(view, position < 0 ? width * position : -width * position
                * 0.25f);
    }

    private static final float min(float val, float min) {
        return val < min ? min : val;
    }

}