private static void drawCircle(double x, double y, double radius){
			//filled circle
				double x1,y1,x2,y2;
				double angle;
				 
				GL11.glColor3f(0.7f, 0.7f, 0.7f);
				GL11.glBegin(GL11.GL_TRIANGLE_FAN);
				GL11.glVertex2d(x,y);
				 
				for (angle=1.0f;angle<361.0f;angle+=0.2)
				{
				    x2 = x+Math.sin(angle)*radius;
				    y2 = y+Math.cos(angle)*radius;
				    GL11.glVertex2d(x2,y2);
				}
				GL11.glEnd();
	}