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Hi there
I have a traffic simulation code that is producing this message when i run the code. start:applet not initialized. does anyone know how i should initialize this applet
import java.io.InputStream;
import java.net.URL;
import java.util.*;
import java.awt.*;
import java.applet.Applet;
import java.lang.Thread;
class Node {
double x;
double y;
int lane;
int road;
double dx;
double dy;
String lbl;
int carW;
int carL;
double carWaiting;
}
class ChangeLight implements Runnable {
int signal;
int pauss, redpauss, greenpauss;
Thread lighter;
ChangeLight(){
signal=1;
redpauss=6000;
greenpauss=6000;
}
public void run() {
signal=1;
while (true) {
if (signal==1){
signal=0;
pauss=greenpauss;
}
else {
signal=1;
pauss=redpauss;
}
try {
Thread.sleep(pauss);
} catch (InterruptedException e) {
break;
}
}
}
public void start() {
lighter = new Thread(this);
lighter.start();
}
public void stop() {
lighter.stop();
}
}
class CalFlow implements Runnable {
int carnum, count;
double carwt;
int pauss;
double time0, time1, timelap;
double carflow[] = new double[40];
Thread flow;
CalFlow(){
carnum=0;
carwt=0;
pauss=2000;
time0=0;
time1=0;
for (int k=0; k<40; k++)
carflow[k]=0;
count=0;
}
public void run() {
while (true) {
time1= System.currentTimeMillis();
timelap=time1-time0;
if (timelap >50)
carflow[count]= ((double)(carnum)/timelap)*1000;
count=(count+1)%40;
try {
Thread.sleep(pauss);
} catch (InterruptedException e) {
break;
}
}
}
public void start() {
flow = new Thread(this);
flow.start();
}
public void stop() {
flow.stop();
}
}
class GraphPanel extends Applet implements Runnable {
Graph graph;
int nnodes;
int lghtOrStp;
Node nodes[] = new Node[100];
ChangeLight light[] = new ChangeLight[5];
CalFlow carpermin[] = new CalFlow[5];
Thread relaxer, flow;
int brgflag[] = new int[5];
double speed=10;
int carwidth=6, carlength=9;
int xpos[]= new int[5];
int ypos=200;
int brgright[] = new int[5];
int brgleft[] = new int[5];
int brgtop =ypos+ carlength;
int brgbottom=ypos- carlength;
int rdleft[]=new int[5];
int rdright[] = new int[5];
int rdtop= ypos+ carwidth, rdbottom= ypos- carwidth;
GraphPanel(Graph graph) {
lghtOrStp=1; //stop :0, light: 1
this.graph = graph;
for (int i=0; i<5; i++)
{
light= new ChangeLight();
carpermin= new CalFlow();
xpos=150*(i+1);
brgright=xpos- carlength;
brgleft=xpos+ carlength;
brgflag=0;
}
for(int k=1; k<4; k++){
rdleft[k]= xpos[k-1]- carwidth;
rdright[k]= xpos[k-1]+ carwidth;
}
rdleft[0]=0;
rdright[0]=0;
}
int findNode(String lbl) {
for (int i = 0 ; i < nnodes ; i++) {
if (nodes.lbl.equals(lbl)) {
return i;
}
}
return addNode(lbl);
}
int addNode(String lbl) {
int temp;
Node n = new Node();
temp = (int)(5*Math.random());
if (temp==0||temp==4){
n.x = 480 + 210*Math.random();
n.y= ypos;
n.carW=carlength;
n.carL=carwidth;
}
else{
n.x= xpos[temp-1];
n.y= 10+100*Math.random();
n.carW=carwidth;
n.carL=carlength;
}
// temp=(int)(3*Math.random()); // three lanes
// n.y = 150+50*temp;
if (temp==4)
temp=0;
n.road=temp;
n.lbl = lbl;
n.carWaiting=-1;
nodes[nnodes] = n;
return nnodes++;
}
public void run() {
for (int j=0; j<5; j++)
light[j].signal=1;
flow = new Thread(carpermin[0]);
carpermin[0].time0 = System.currentTimeMillis();
carpermin[0].carnum=0;
flow.start();
while (true) {
relax();
try {
Thread.sleep(50);
} catch (InterruptedException e) {
break;
}
}
}
synchronized void relax() {
for (int i = 0 ; i < nnodes; i++) {
if (nodes.road==0){
nodes.dx = -speed*Math.random();
nodes.dy = 2*Math.random()-1;
}
else{
nodes.dy = speed*Math.random();
nodes.dx = 2*Math.random()-1;
}
}
for (int i = 0 ; i < nnodes ; i++) {
Node n1 = nodes;
double dx = 0;
double dy = 0;
for (int j = 0 ; j < nnodes ; j++) {
Node n2 = nodes[j];
if (i == j||n1.road!=n2.road) {
continue;
}
double vx;
if(n1.road==0)
vx = n1.x - n2.x;
else
vx= n2.y-n1.y;
if (vx<0)
continue;
double len=vx;
if( len<(n2.carW+n2.carL)){
if (n1.carWaiting<0)
n1.carWaiting= System.currentTimeMillis();
if(n1.road==0)
n1.dx=0;
else
n1.dy=0;
}
}
}
//move a car
Dimension d = size();
double temp;
for (int i = 0 ; i < nnodes ; i++) {
Node n = nodes;
if(n.road==0){
temp=n.x;
n.x += Math.max(-10, Math.min(10, n.dx));
for (int k=0; k<3; k++){
if ((n.x<brgleft[k]&&n.x>brgright[k])&&brgflag[k]==1){
if(temp> brgleft[k] ||temp<brgright[k])
n.x=temp;
}
else if ((n.x< brgleft[k] &&n.x>brgright[k])&&brgflag[k]==0)
if (lghtOrStp==0)
brgflag[k]=1;
else{
if (light[k].signal==0)
brgflag[k]=1;
else
n.x=temp;
}
else if(temp< brgleft[k] &&temp>brgright[k])
brgflag[k]=0;
if (n.x < 0) {
n.x = d.width-10*Math.random();
carpermin[0].carnum=carpermin[0].carnum+1;
} else if (n.x > d.width) {
n.x = d.width-10*Math.random();
}
if (n.x!=temp&&n.carWaiting==-1){
carpermin[0].carwt+= System.currentTimeMillis()-
n.carWaiting;
n.carWaiting=-1;
}
}
}
else{
temp=n.y;
n.y += Math.max(-10, Math.min(10, n.dy));
if ((n.y<brgtop&&n.y>brgbottom)&&brgflag[n.road-1]==1){
if(temp> brgtop ||temp<brgbottom)
n.y=temp;
}
else if ((n.y< brgtop &&n.y>brgbottom)&&brgflag[n.road-1]==0)
if (lghtOrStp==0)
brgflag[n.road-1]=1;
else{
if (light[n.road-1].signal==1)
brgflag[n.road-1]=1;
else
n.y=temp;
}
else if(temp< brgtop &&temp>brgbottom)
brgflag[n.road-1]=0;
if (n.y > d.height||n.y<0) {
n.y = 10*Math.random();
carpermin[0].carnum=carpermin[0].carnum+1;
}
}
}
repaint();
}
Node pick;
double pickoldx, pickoldy;
Image offscreen;
Dimension offscreensize;
Graphics offgraphics;
final Color selectColor = Color.pink;
final Color edgeColor = Color.black;
final Color nodeColor = new Color(250, 220, 100);
public void paintNode(Graphics g, Node n) {
int x = (int)n.x;
int y = (int)n.y;
g.setColor((n==pick) ? selectColor : nodeColor);
int w= n.carW;
int h=n.carL;
g.fillRect(x - w/2, y - h / 2, w, h);
g.setColor(Color.black);
g.drawRect(x - w/2, y - h / 2, w-1, h-1);
g.drawString(".", x-w/2+2, y+h/2-2);
}
public void paintRoad(Graphics g){
Dimension d = size();
g.setColor(Color.gray);
for(int k=1; k<4; k++){
g.drawLine(rdleft[k], 0, rdleft[k], rdbottom);
g.drawLine(rdleft[k], rdtop, rdleft[k], d.height);
g.drawLine(rdright[k], 0, rdright[k], rdbottom);
g.drawLine(rdright[k], rdtop, rdright[k], d.height);
g.drawLine(rdright[k-1], rdtop, rdleft[k], rdtop);
g.drawLine(rdright[k-1], rdbottom, rdleft[k], rdbottom);
}
g.drawLine(rdright[3], rdbottom, d.width, rdbottom);
g.drawLine(rdright[3], rdtop, d.width, rdtop);
}
public void paintLghtPeriod(Graphics g){
Font warnFont, dispFont, stopFont;
warnFont=new Font("Arial", Font.BOLD, 20);
dispFont=new Font("TimesRoman", 0, 12);
stopFont=new Font("TimesRoman", Font.BOLD, 14);
Dimension d = size();
offgraphics.setColor(Color.black);
if(lghtOrStp==1){
offgraphics.drawString("Traffic Light Period (1: red, 0: green)", 600,50);
offgraphics.setColor(Color.red);
offgraphics.drawString("red", 714, 50);
offgraphics.setColor(Color.green);
offgraphics.drawString("green", 747, 50);
offgraphics.setColor(Color.black);
for(int k=0; k<3; k++){
int tempred= light[k].redpauss/200, tempgreen= light[k].greenpauss/200;
int temp1=rdright[3]+170;
int temp2, temp3, temp4, temp5;
if (light[k].signal==0){
temp2=temp1+tempred;
temp3=30*(k+1)+40;
temp4= temp2+tempgreen;
temp5=temp3+12;
}
else{
temp2=temp1+tempgreen;
temp3=30*(k+1)+40+12;
temp4= temp2+tempred;
temp5=temp3-12;
}
offgraphics.drawString("Light " +Integer.toString(k+1), temp1-40, (temp5+temp3)/2+5);
while (temp1<d.width){
offgraphics.drawLine(temp1, temp3, temp2, temp3);
offgraphics.drawLine(temp2, temp5, temp4, temp5);
offgraphics.drawLine(temp1, temp3, temp1, temp5);
offgraphics.drawLine(temp2, temp3, temp2, temp5);
temp1=temp4;
temp2=temp1+tempred;
temp4=temp2+tempgreen;
}
}
offgraphics.setColor(Color.lightGray);
offgraphics.fillRect(rdright[3]+328, 30, 15, 130);
offgraphics.setColor(Color.gray);
offgraphics.drawRect(rdright[3]+120, 20, 223, 145);
offgraphics.setColor(Color.black);
}
else{
offgraphics.setFont(warnFont);
offgraphics.setColor(Color.white);
offgraphics.fillOval(rdleft[3]+175, rdtop-160, 70, 70);
offgraphics.setColor(Color.red);
offgraphics.fillOval(rdleft[3]+180, rdtop-155, 60, 60);
offgraphics.setColor(Color.white);
offgraphics.drawString("STOP", rdleft[3]+183, rdtop-116);
offgraphics.setColor(Color.black);
offgraphics.setFont(dispFont);
offgraphics.drawString("(California)", rdleft[3]+185, rdtop-50);
}
}
public void paintLights(Graphics g){
Font dispFont, stopFont;
dispFont=new Font("TimesRoman", 0, 12);
stopFont=new Font("TimesRoman", Font.BOLD, 14);
g.setFont(dispFont);
int lightwidth=15;
for(int k=1; k<4; k++){
if(lghtOrStp==0){
g.setColor(Color.red);
g.fillOval(rdleft[k]-18, rdtop+4, lightwidth, lightwidth);
g.setColor(Color.white);
g.setFont(stopFont);
g.drawString("S", rdleft[k]-14, rdtop+16);
g.setFont(dispFont);
}
else{
g.setColor(Color.black);
g.fillRect(rdleft[k]-18, rdtop+4, lightwidth-2, lightwidth-2);
g.setColor(light[k-1].signal==1 ? Color.red : Color.green);
g.fillOval(rdleft[k]-7, rdtop+6, 6, 9);
g.setColor(light[k-1].signal==1 ? Color.green : Color.red);
g.fillOval(rdleft[k]-16, rdtop+2, 9, 6);
g.setColor(Color.black);
g.drawString("Light "+k, rdleft[k]-58, rdtop+17);
}
}
}
public void paintAxies(Graphics g){
int temp1=610;
int temp2=350;
int temp3=temp1+160;
int temp4= temp2-80;
offgraphics.setColor(Color.gray);
offgraphics.drawRect(rdright[3]+120, temp4-35, 220, 130);
offgraphics.setColor(Color.black);
offgraphics.drawLine(temp1, temp2, temp3, temp2);
offgraphics.drawLine(temp3, temp2, temp3-10, temp2-2);
offgraphics.drawLine(temp3, temp2, temp3-10, temp2+2);
offgraphics.drawLine(temp1, temp2, temp1, temp4);
offgraphics.drawLine(temp1, temp4, temp1-2, temp4+10);
offgraphics.drawLine(temp1, temp4, temp1+2, temp4+10);
for (int k=1; k<4; k++){
int grid=20*k;
offgraphics.drawLine(temp1, temp2- grid, temp1+5, temp2- grid);
offgraphics.drawString(k+".0", temp1- 20, temp2- grid+5);
}
offgraphics.drawString("Time", temp3-10, temp2-10);
offgraphics.drawString("Traffic Flow ", temp1-20, temp2-95);
offgraphics.drawString(" (cars/sec.)", temp1-20, temp2-82);
for (int k=0; k<40; k++){
if (k>=carpermin[0].count){
temp3=1;
offgraphics.setColor(Color.gray);
}
else{
temp3=2;
offgraphics.setColor(Color.black);
}
offgraphics.drawRect(k*3+temp1, temp2 - (int)(carpermin[0].carflow[k]*20+1), temp3, temp3);
}
}
public synchronized void update(Graphics g) {
Dimension d = size();
if ((offscreen == null) || (d.width != offscreensize.width) || (d.height != offscreensize.height)) {
offscreen = createImage(d.width, d.height);
offscreensize = d;
offgraphics = offscreen.getGraphics();
}
offgraphics.setColor(getBackground());
offgraphics.fillRect(0, 0, d.width, d.height);
paintRoad(offgraphics);
//draw lights
paintLights(offgraphics);
//draw light period
paintLghtPeriod(offgraphics);
//draw axies for the flow chart
paintAxies(offgraphics);
//draw cars
for (int i = 0 ; i < nnodes ; i++) {
paintNode(offgraphics, nodes);
}
g.drawImage(offscreen, 0, 0, null);
}
public synchronized boolean mouseDown(Event evt, int x, int y) {
double bestdist = Double.MAX_VALUE;
for (int i = 0 ; i < nnodes ; i++) {
Node n = nodes;
double dist = (n.x - x) * (n.x - x) + (n.y - y) * (n.y - y);
if (dist < bestdist) {
pick = n;
pickoldx=n.x;
pickoldy=n.y;
bestdist = dist;
}
}
pick.x = x;
pick.y = y;
repaint();
return true;
}
public synchronized boolean mouseDrag(Event evt, int x, int y) {
pick.x = x;
pick.y = y;
repaint();
return true;
}
public synchronized boolean mouseUp(Event evt, int x, int y) {
boolean insidelane;
pick.x = x;
pick.y = y;
insidelane=false;
for (int k=1; k<4; k++)
if (x>rdleft[k]&&x<rdright[k])
{
pick.road=k;
pick.x=xpos[k-1];
pick.carW= carwidth;
pick.carL= carlength;
insidelane=true;
}
if (!insidelane&&(y<rdtop&&y>rdbottom))
{
pick.road=0;
pick.y=ypos;
pick.carW= carlength;
pick.carL= carwidth;
}
else if(!insidelane)
{
pick.x=pickoldx;
pick.y=pickoldy;
}
pick = null;
repaint();
return true;
}
public void start() {
relaxer = new Thread(this);
relaxer.start();
}
public void stop() {
relaxer.stop();
}
}
public class Graph extends java.applet.Applet {
GraphPanel panel;
int carnum;
Thread LightThrd[] = new Thread[3];
public void init() {
setLayout(new BorderLayout());
panel = new GraphPanel(this);
carnum = Integer.parseInt(getParameter("carnum"));
carnum=Math.min(carnum, 70);
for (int k=0; k<carnum; k++)
panel.findNode(Integer.toString(k));
panel.lghtOrStp=1;
for (int k=0; k<3; k++){
LightThrd[k] = new Thread(panel.light[k]);
panel.light[k].redpauss=(k+1)*1000+3000;
panel.light[k].greenpauss=panel.light[k].redpauss;
LightThrd[k].start();
}
panel.carpermin[0].time0 = System.currentTimeMillis();
panel.carpermin[0].carnum=0;
Panel btpnl=new Panel();
add("South", btpnl);
btpnl.add(new Button("Start"));
btpnl.add(new Button("End"));
btpnl.add(new Button("Stop Sign"));
btpnl.add(new Button("Traffic Light"));
btpnl.add(new Button("New Schedule for Lights"));
}
public boolean actionPerformed(Event evt, Object arg){
if (((Button)evt.target).getLabel().equals("Traffic Light"))
{
if (panel.lghtOrStp==0){
panel.lghtOrStp=1;
for (int k=0; k<3; k++){
LightThrd[k] = new Thread(panel.light[k]);
panel.light[k].redpauss=(k+1)*1000+3000;
panel.light[k].greenpauss=panel.light[k].redpauss;
LightThrd[k].start();
panel.carpermin[0].time0 = System.currentTimeMillis();
panel.carpermin[0].carnum=0;
}
}
}
else if (((Button)evt.target).getLabel().equals("Stop Sign"))
{
panel.lghtOrStp=0;
for(int k=0; k<3; k++){
if (LightThrd[k].isAlive())
LightThrd[k].stop();
}
panel.carpermin[0].time0 = System.currentTimeMillis();
panel.carpermin[0].carnum=0;
}
else if (((Button)evt.target).getLabel().equals("End"))
{
for(int k=0; k<3; k++){
if (LightThrd[k].isAlive())
LightThrd[k].stop();
}
panel.stop();
}
else if (((Button)evt.target).getLabel().equals("Start"))
{
if(panel.lghtOrStp==1)
for(int k=0; k<3; k++){
if (!LightThrd[k].isAlive()){
LightThrd[k] = new Thread(panel.light[k]);
LightThrd[k].start();
}
}
if (!panel.relaxer.isAlive())
panel.start();
}
else if (((Button)evt.target).getLabel().equals("New Schedule for Lights"))
{
if (panel.lghtOrStp==1){
for(int k=0; k<3; k++){
if (LightThrd[k].isAlive()){
panel.light[k].redpauss=(int)(Math.random()*6000)+3000;
panel.light[k].greenpauss=(int)(Math.random()*6000)+3000;
}
}
panel.carpermin[0].time0 = System.currentTimeMillis();
panel.carpermin[0].carnum=0;
panel.carpermin[0].carwt=0;
}
}
return true;
}
public void start() {
panel.start();
}
public void stop() {
panel.stop();
}
}
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Save this in a file named Graph. Have GraphPanel extend Panel instead of Applet. Both classes use deprecated methods such as the Thread method "stop". Graph uses "public boolean actionPerformed(Event evt, Object arg)" which is antique. GraphPanel uses "size" and more antique event methods like "public synchronized boolean mouseUp(Event evt, int x, int y)". The new event model uses EventListener classes which receive the events sent by registered components. If you are serious about making this work I would start over with the smaller classes and Graph, slowly building it up until you are ready to begin adding a mostly-empty GraphPanel class and slowly build it up, ie, add some code and re-compile and run each time.
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chagwedera
