Android Open Source - CreditCardEntry Flip Animator

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License

The source code is released under:

MIT License

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Java Source Code

package com.devmarvel.creditcardentry.internal;
/*from   w  ww  . j  a  v  a 2s .  co m*/
import android.graphics.Camera;
import android.graphics.Matrix;
import android.view.View;
import android.view.animation.AccelerateDecelerateInterpolator;
import android.view.animation.Animation;
import android.view.animation.Transformation;

public class FlipAnimator extends Animation {
  private Camera camera;

  private View fromView;

  private View toView;

  private float centerX;

  private float centerY;

  private boolean forward = true;

  private boolean visibilitySwapped;

  /**
   * Creates a 3D flip animation between two views. If forward is true, its
   * assumed that view1 is "visible" and view2 is "gone" before the animation
   * starts. At the end of the animation, view1 will be "gone" and view2 will
   * be "visible". If forward is false, the reverse is assumed.
   * 
   * @param fromView
   *            First view in the transition.
   * @param toView
   *            Second view in the transition.
   * @param centerX
   *            The center of the views in the x-axis.
   * @param centerY
   *            The center of the views in the y-axis.
   * @param forward
   *            The direction of the animation.
   */
  public FlipAnimator(View fromView, View toView, int centerX, int centerY) {
    this.fromView = fromView;
    this.toView = toView;
    this.centerX = centerX;
    this.centerY = centerY;

    setDuration(500);
    setFillAfter(true);
    setInterpolator(new AccelerateDecelerateInterpolator());
  }

  public void reverse() {
    forward = false;
    View temp = toView;
    toView = fromView;
    fromView = temp;
  }

  @Override
  public void initialize(int width, int height, int parentWidth,
      int parentHeight) {
    super.initialize(width, height, parentWidth, parentHeight);
    camera = new Camera();
  }

  @Override
  protected void applyTransformation(float interpolatedTime, Transformation t) {
    // Angle around the y-axis of the rotation at the given time. It is
    // calculated both in radians and in the equivalent degrees.
    final double radians = Math.PI * interpolatedTime;
    float degrees = (float) (180.0 * radians / Math.PI);

    // Once we reach the midpoint in the animation, we need to hide the
    // source view and show the destination view. We also need to change
    // the angle by 180 degrees so that the destination does not come in
    // flipped around. This is the main problem with SDK sample, it does not
    // do this.
    if (interpolatedTime >= 0.5f) {
      degrees -= 180.f;

      if (!visibilitySwapped) {
        fromView.setVisibility(View.GONE);
        toView.setVisibility(View.VISIBLE);

        visibilitySwapped = true;
      }
    }

    if (forward)
      degrees = -degrees;

    final Matrix matrix = t.getMatrix();

    camera.save();
    camera.translate(0.0f, 0.0f, (float) (150.0 * Math.sin(radians)));
    camera.rotateY(degrees);
    camera.getMatrix(matrix);
    camera.restore();

    matrix.preTranslate(-centerX, -centerY);
    matrix.postTranslate(centerX, centerY);
  }
}

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