Android Open Source - picturepuzzle Piece Transition Animation

From Project

Back to project page picturepuzzle.

License

The source code is released under:

GNU General Public License

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Java Source Code

package me.crr.picturepuzzle;
//from  ww w . j  a va 2 s . c o  m
import android.os.SystemClock;

public class PieceTransitionAnimation {
  public int startingPosX;
  public int startingPosY;
  
  public int endPosX;
  public int endPosY;
  
  public Piece piece;

  private long startTime;
  private long endTime;
  
  //Used in the animation
  private long time = 0; 
  private float gradient = 0;
  private float currentTime;
  public PicturePuzzle caller;
  
  public PieceTransitionAnimation(PicturePuzzle caller) {
    this.caller = caller;
  }
  
  /**
   * A method to set up the data for the transition but also serves as starting the animation
   * @param pieceToAnimate
   * @param endPiece
   * @param time The duration of the transition
   */
  public void setAnimationData(Piece pieceToAnimate, Piece endPiece, long time) {
    this.piece = pieceToAnimate;
    this.endPosX = endPiece.i * Piece.getPieceWidth();
    this.endPosY = endPiece.j * Piece.getPieceHeight();
    
    this.startingPosX = piece.i * Piece.getPieceWidth();
    this.startingPosY = piece.j * Piece.getPieceHeight();
    
    this.time = time;
    this.startTime = SystemClock.uptimeMillis();
    this.endTime = startTime + time;
    
  }

  /**
   * 
   * @return if the animation is finished or not
   */
  public boolean update(){
    currentTime = SystemClock.uptimeMillis();
    
    if(piece == null)
      return false;
    
    if(currentTime < endTime && piece != null){      
      
      gradient = (currentTime - startTime)/time;
      piece.x = (((endPosX - startingPosX) * gradient) + startingPosX);
      piece.y = (((endPosY - startingPosY) * gradient) + startingPosY);
    }else{
      caller.swapPiece(piece, caller.getFreePiece(), caller.getPieces());
      piece = null;
      return true;
    }
    
    
    return false;
  }

  public void kill() {
    // TODO Auto-generated method stub
    caller.swapPiece(piece, caller.getFreePiece(), caller.getPieces());
    currentTime = endTime;
    piece = null;
  }
}

Java Source Code List