Initial data commit

Task/Greyscale-bars-Display/Java/greyscale-bars-display.java

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+import javax.swing.* ;
+import java.awt.* ;
+
+public class Greybars extends JFrame {
+   private int width ;
+   private int height ;
+
+   public Greybars( )  {
+      super( "grey bars example!" ) ;
+      width = 640 ;
+      height = 320 ;
+      setSize( width , height ) ;
+      setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE ) ;
+      setVisible( true ) ;
+    }
+
+    public void paint ( Graphics g ) {
+      int run = 0 ;
+      double colorcomp = 0.0 ; //component of the color
+      for ( int columncount = 8 ; columncount < 128 ; columncount *= 2 ) {
+	 double colorgap = 255.0 / (columncount - 1) ; //by this gap we change the background color
+	 int columnwidth = width / columncount ;
+	 int columnheight = height / 4 ;
+	 if ( run % 2 == 0 ) //switches color directions with every for loop
+	    colorcomp = 0.0 ;
+	 else {
+	    colorcomp = 255.0 ;
+	    colorgap *= -1.0 ;
+	 }
+	 int ystart = 0 + columnheight * run ;
+	 int xstart = 0 ;
+	 for ( int i = 0 ; i < columncount ; i++ ) {
+            int icolor = (int)Math.round(colorcomp) ; //round to nearer integer
+	    Color nextColor = new Color( icolor , icolor, icolor ) ;
+	    g.setColor( nextColor ) ;
+	    g.fillRect( xstart , ystart , columnwidth , columnheight ) ;
+	    xstart += columnwidth ;
+	    colorcomp += colorgap ;
+	 }
+	 run++ ;
+      }
+    }
+
+    public static void main( String[ ] args ) {
+       Greybars gb = new Greybars( ) ;
+    }
+}