BufferedImage in Java 

Main.java

class Main extends javax.swing.JComponent implements java.lang.Runnable
{ final int[] X ={ 800, 800 };
  private static final long serialVersionUID = 0L;
  final java.awt.image.BufferedImage onScreenImage
  = new java.awt.image.BufferedImage
  ( X[ 1 ], X[ 0 ], java.awt.image.BufferedImage.TYPE_INT_RGB );
  @java.lang.Override public void paintComponent( final java.awt.Graphics graphics )
  { graphics.drawImage( Main.this.onScreenImage, 0, 0, null ); }
  final java.awt.image.BufferedImage offScreenImage
  = new java.awt.image.BufferedImage
  ( X[ 1 ], X[ 0 ], java.awt.image.BufferedImage.TYPE_INT_RGB );
  public static int get( final int color, final int shift )
  { return (( color &( 0x000000FF << shift ))>> shift ); }
  public static int B( final int color ){ return get( color, 0 ); }
  public static int G( final int color ){ return get( color, 8 ); }
  public static int R( final int color ){ return get( color, 16 ); }
  public static void limit( final double[] a, final int i, final int max )
  { if( a[ i ]< 0 ){ a[ i ]= 0; return; }else
    if( a[ i ]> max ){ a[ i ]= max; return; }}
  public static int color( final int r, final int g, final int b )
  { return ( r << 16 )|( g << 8 )| b; }
  public static int color( final double[] C )
  { return color( ( int )C[ 0 ],( int )C[ 1 ],( int )C[ 2 ]); }
  long l0 = -1L;
  final long FINAL_PHASE = -1L;
  @java.lang.Override public final void run()
  { final javax.swing.JFrame frame = new javax.swing.JFrame( this.getClass().getName() );
    Main.this.setPreferredSize( new java.awt.Dimension( X[ 1 ], X[ 0 ]));
    frame.setDefaultCloseOperation( javax.swing.JFrame.EXIT_ON_CLOSE );
    frame.add( Main.this ); frame.pack(); frame.setVisible( true );
    final java.lang.Runnable loop = new java.lang.Runnable()
    { double[] x ={ X[ 0 ]/2, X[ 1 ]/2 }; double[] C ={ 127, 127, 127 };
      long t = 0; long b = 0; long c = 0;
      public void drawRandomPictureToOnScreenImage()
      { /* draw a new random offScreenImage */
        for( int i = 0; i < 100_000; ++i )
        { for( int j = 0; j < 2; ++j ){ x[ j ]+=( java.lang.Math.random() - 0.5 ); limit( x, j, X[ j ] - 1 ); }
          for( int j = 0; j < 3; ++j ){ C[ j ]+=( java.lang.Math.random() - 0.5 ); limit( C, j, 255 ); }
          Main.this.onScreenImage.setRGB(( int )x[ 1 ],( int )x[ 0 ], color( C )); }
        final long l = java.lang.System.nanoTime();
        if( l - t > 100_000L )
        { /* Paints the specified region in this component and all
          of its descendants that overlap the region, immediately.
          paintImmediately() needs to be called within EDT */
          Main.this.paintImmediately
          ( 0, 0, java.lang.Integer.MAX_VALUE, java.lang.Integer.MAX_VALUE ); t = l; }}
      public void mirrorPhase()
      { /* copy from off-screen Image to on-screen Image using a transform */
        final long l = java.lang.System.nanoTime();
        while( java.lang.System.nanoTime() - l < 100_000_000L )
        { final long l1 = java.lang.System.nanoTime(); if( l0 < 0 )l0 = l;
          final double k = 0.5 - java.lang.Math.cos
          ( ( l1 - l0 )/ 1E9 %( 2 * java.lang.Math.PI )) / 2;
          { { /* Creates a Graphics2D, which can be used to draw into this BufferedImage. */
              Main.this.onScreenImage.createGraphics(); }
            final java.awt.Graphics2D currentGraphics =
            ( java.awt.Graphics2D )Main.this.onScreenImage.getGraphics();
            currentGraphics.clearRect( 0, 0, X[ 1 ], X[ 0 ]);
            currentGraphics.setTransform( new java.awt.geom.AffineTransform( 1 - 2 * k, 0, 0, 1, k * X[ 1 ], 0 ));
            { /* paint transform original into current */
              currentGraphics.drawImage( Main.this.offScreenImage, 0, 0, null ); }}
          /* Paints the specified region in this component and all 
             of its descendants that overlap the region, immediately.
             paintImmediately() needs to be called within EDT */
          Main.this.paintImmediately( 0, 0, java.lang.Integer.MAX_VALUE, java.lang.Integer.MAX_VALUE ); }}
      public void run()
      { if( b == 0L )b = java.lang.System.nanoTime();
        if( b != FINAL_PHASE )
        { if( java.lang.System.nanoTime() - b <= 10_000_000_000L )drawRandomPictureToOnScreenImage();
          else
          { /* switch from initial phase to final phase */
            { /* copy from onScreenImage to offScreenImage */
              onScreenImage.copyData( offScreenImage.getRaster() ); }
            b = FINAL_PHASE; c = java.lang.System.nanoTime(); } }
        else mirrorPhase();
        java.awt.EventQueue.invokeLater( this ); }};
    loop.run(); }
  public static void main( final java.lang.String args[] )
  { java.awt.EventQueue.invokeLater( new Main() ); }}

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