vrml.rar_VRML_vrml java

//Newton迭代法（fractal.cn） import java.awt.*; import java.applet.*; import java.awt.event.*; class Fractal extends Canvas { public Fractal() { this.setBackground(Color.white); } public void paint(Graphics g) { int a=640; int b=480; int M=100; int K=100; double pMin=-2.2; double qMin=-1.2; double pMax=0.7; double qMax=1.2; double p1,q1; p1=(pMax-pMin)/(a-1); q1=(qMax-qMin)/(b-1); for(int i=0;i<a;i++) for( int j=0;j<b;j++) { double p0=pMin+i*p1; double q0=qMin+j*q1; double x0=0; double y0=0; int k=0; int color=0; double x1; double y1; double r; for(k=1;k<K;k++) { x1=x0; y1=y0; x0=x1*x1-y1*y1+p0; y0=2*x1*y1+q0; r=x0*x0+y0*y0; if(r>M){ color=200*k; break; } } g.setColor(new Color(color)); if(k==K){ g.setColor(Color.white); } g.drawLine(i,j,i,j); }//end for }//end of paint } public class Mandel extends Applet { Fractal fractal; public void init() { setLayout(new BorderLayout()); fractal=new Fractal(); add("Center",fractal); } }