// Walter Orlov, August 2003 import java.applet.*; import java.awt.*; public class appl1 extends java.applet.Applet { public void init() { setLayout(new BorderLayout()); setBackground(Color.white); } public void paint(Graphics g) { double r[]= new double[15]; double ro = 25000., mc = 0., r0 = 35.; int i, j, count = 15, center = 160; g.setColor(Color.black); g.drawString("R",320,center+15); g.drawString("V",center-15,15); g.drawString("g,a",center-20,2*center-10); g.drawLine(10,center,330,center); g.drawLine(center,315,center,5); g.fillArc(center-3, center-3, 6, 6, 0, 360); g.setColor(Color.yellow); g.fillArc(center+83,center-2, 4, 4, 0, 360); g.setColor(Color.red); for(i=0;i<count;i++){ r[i]=10+i*10; g.fillArc(center+(int)r[i]-3,center-3, 6, 6, 0, 360); g.fillArc(center-(int)r[i]-3,center-3, 6, 6, 0, 360); } // Action for(i=1;i<count;i++){ g.setColor(Color.green); mc=0.; for(j=0;j<i;j++)mc = mc + 2*ro*Math.exp(-r[j]/r0); mc = mc/(r[i]*r[i]); // g, V g.fillArc(center+10+i*10, center+(int)(1.5*mc), 3, 3, 0, 360); g.fillArc(center+10+i*10, center-(int)(10.*Math.sqrt(i*mc)), 3, 3, 0, 360); // a, V g.setColor(Color.blue); for(j=i;j<count;j++)mc = mc - ro*Math.exp(-r[j]/r0)/(r[j]*r[j]) + ro*Math.exp(-2*r[j]/r0)/(r[j]*r[j]); g.fillArc(center+10+i*10, center+(int)(1.5*mc), 3, 3, 0, 360); if(mc>0.)g.fillArc(center+10+i*10, center-(int)(10.*Math.sqrt(i*mc)), 3, 3, 0, 360); } } }