JAVA Radar Scan Map __java

Above, on the code

Package demo;
Import Java.awt.AlphaComposite;
Import Java.awt.Color;
Import Java.awt.Composite;
Import java.awt.Dimension;
Import Java.awt.Graphics;
Import Java.awt.Graphics2D;
Import java.awt.RenderingHints;
Import Java.awt.geom.Arc2D;

Import Java.awt.geom.Ellipse2D;
Import javax.swing.JComponent;

Import Javax.swing.JFrame;

Import Blade.paint.FanShapedGradientPaint; /** * * @author Administrator */public class Radardemo extends JComponent {public static void main (String argv
		[]) {JFrame frame = new JFrame ();
		Frame.setcontentpane (New Radardemo ());
		Frame.setsize (800, 600);
		Frame.setdefaultcloseoperation (Jframe.exit_on_close);
	Frame.setvisible (TRUE);
		@Override public void Paintcomponent (Graphics g) {graphics2d g2d = (graphics2d) g;
		G2d.setrenderinghint (renderinghints.key_antialiasing, renderinghints.value_antialias_on);
		Paintbackground (g);
		Paintradarring (g);
	Paintfanshapedgradient (g); } protected void Paintbackground (Graphics g) {G.setcoloR (Color.Black);
	G.fillrect (0, 0, this.getwidth (), This.getheight ());
		} protected void Paintradarring (Graphics g) {graphics2d g2d = (graphics2d) g;
		G.setcolor (Color.green);
		Dimension d = this.getsize ();

		Double radius = math.min (d.width, d.height)/2;
			for (int r = 1; r <= 5; r++) {Double R = R * RADIUS/5;
			Double x = D.WIDTH/2-R;
			Double y = d.height/2-R;
			ellipse2d ellipse = new Ellipse2d.double (x, Y, R * 2, R * 2);
		G2d.draw (ellipse);
		} protected void Paintfanshapedgradient (Graphics g) {graphics2d g2d = (graphics2d) g;
		Composite Oldcomp = G2d.getcomposite ();
		Alphacomposite comp = alphacomposite.getinstance (3, 0.5f);

		G2d.setcomposite (comp);
		Dimension d = this.getsize ();
		Double radius = math.min (d.width, d.height)/2;
		Double x = (D.width-radius * 2)/2;

		Double y = (D.height-radius * 2)/2; Fanshapedgradientpaint paint = new Fanshapedgradientpaint (x, Y, MATH.PI/2, MATH.PI/2, radius, Color.green, color.black);

		G2d.setpaint (paint);
		arc2d arc = new arc2d.double (x, y, Radius * 2, RADIUS * 2, N, Arc2d.pie);

		G2d.fill (ARC);
	G2d.setcomposite (Oldcomp);
 }
}