我试图用几辆汽车和交叉路口的救护车和交通信号灯创建交通模拟。我试图测量救护车通过交通所需的时间。我然而，我看到了汽车（大约3辆），但我不确定如何让红绿灯出现。
我使用画布绘制并为每个对象指定参数，例如汽车，救护车，停车线等。当我尝试对交通灯对象执行相同操作时，它不会显示 - 然后我尝试从我的drawlight方法中指定参数（颜色，x和y坐标和直径），但仍然没有显示。
任何人都可以帮助我至少让交通灯出现吗？感谢
以下是代码：
/**
* Author: Jean-Paul Fernandes
* ******TRAFFIC SIMULATION******
*
* *****************TrafficCanvas Class******************
*
*/
import java.awt.Canvas;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
public class TrafficCanvas extends Canvas {
/**
*
*/
public static final long serialVersionUID = 1L;
VehicleObject car, car_b, ambulance, ambulance_b;
String message, mode = "hi";
String str_seconds = "";
Boolean end;
StopLine stopline1, stopline2, stopline3, stopline4;
// TrafficLight2 wrson_dock_rd_tl_east_facing;
TrafficLight t1;
int count, seconds;
// TrafficFixtureForward westBound, eastBound, northBound;
// TrafficFixtureTurn turn;
// drawLine(20, 100, 120, 100);
public TrafficCanvas() {
super();
// TODO Auto-generated constructor stub
car = new Car(195,240,20,15,Color.BLUE,Color.GREEN);
// creates a blue car with specified dimension & location
car_b = new Car(215,280,20,15,Color.ORANGE,Color.GREEN);
ambulance = new Ambulance(300,240,30,17,Color.RED,Color.BLACK,false);
// creates a red ambulance in emergency mode
// if (count == 10)
{
ambulance_b = new Ambulance(350,280,30,17,Color.BLUE,Color.BLACK,true);
// creates another ambulance
}
stopline1 = new StopLine (250,240,5,25,Color.GRAY,Color.BLACK);
stopline2 = new StopLine (320,280,5,25,Color.GRAY,Color.BLACK);
stopline3 = new StopLine (260,300,25,5,Color.GRAY,Color.BLACK);
stopline4 = new StopLine (290,235,25,5,Color.GRAY,Color.BLACK);
// t1 = new TrafficLight (Color.RED, Color.YELLOW, Color.GREEN,
// 200,100,100,200,100,100,200,100,100);
// wrson_dock_rd_tl_east_facing = new TrafficLight2 ();
Thread movetraffic = new Traffic();
movetraffic.start();// moves traffic along
Thread starttimer = new Timer();
starttimer.start();
Thread operatetraf_lights = new TrafficController();
operatetraf_lights.start();
/*Thread operatetraf_lights1 = new TrafficFixtureForward(message, count);
operatetraf_lights1.start();*/
} // end TrafficCanvas
public void paint(Graphics g){
Graphics2D g2=(Graphics2D)g;
car.draw(g2);
car_b.draw(g2);
ambulance.draw(g2);
if (count>=10)
ambulance_b.draw(g2);
stopline1.draw(g2);
stopline2.draw(g2);
stopline3.draw(g2);
stopline4.draw(g2);
下一行是我试图创建红绿灯的红灯：
t1.drawLight(g2, Color.RED, 500,500,75,75); // draw red light
{
g2.drawString(mode,600,300);
}
g2.drawString (str_seconds, 200, 200);
try {
// if (end)
{
g2.drawString("End!",400,300);
}
} catch (NullPointerException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}// end paint
public class TrafficController extends Thread {
public void run() {
t1 = new TrafficLight ();
}
}
public class Timer extends Thread {
public void run() {
for (seconds = 0; seconds < 101; seconds++) {
str_seconds = Integer.toString(seconds)+ " seconds";
repaint();
try{
sleep(1000);
}
catch(InterruptedException e){}//end of try catch block
} // end for
repaint();
} // end run()
} // end class Timer
public class Traffic extends Thread {
public void run(){
Car c1 =(Car) car; // creates a car object c1
Car d1 =(Car) car_b;
Ambulance a1 =(Ambulance) ambulance;
// creates an ambulance object a1
Ambulance b1 =(Ambulance) ambulance_b;
if (count >=10) {
if (ambulance_b.EmergencyMode()) {
mode = "Emergency!";
} else {
mode = "Normal";
}
}
for (int count = 0; count < 50; count++) {
if (!(c1.shape().intersects(stopline1.shape()
.getBounds2D()))){
c1.moveEast();
}
a1.moveEast();
if (count>=10) {
if (!(b1.shape().intersects(stopline2.shape()
.getBounds2D()))) {
b1.moveWest();
}
}
d1.moveWest();
repaint();
try{
sleep(500);
}
catch(InterruptedException e){}//end of try catch block
if(c1.shape().intersects(stopline1.shape().getBounds2D())){
}
c1.setXcord(c1.getXcord());
c1.setYcord(c1.getYcord());
a1.setXcord(a1.getXcord()+ 1);
a1.setYcord(a1.getYcord());
if (count>10) {
b1.setXcord(b1.getXcord()+ 1);
b1.setYcord(b1.getYcord());
}
}
end = true;
message = "End!";
repaint();
}// end run
}// end class Traffic
}// end class TrafficCanvas
TrafficLight.java
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.Shape;
import java.awt.geom.Rectangle2D;
import java.awt.*;
import javax.swing.JPanel;
public class TrafficLight
/**
*
*/
private static final long serialVersionUID = 1L;
Color RedColor, YellowColor, GreenColor;
int RedxLCord, RedyLCord, RedLDiam, YellowxLCord, YellowyLCord, YellowLDiam, GreenxLCord, GreenyLCord, GreenLDiam;
public Shape shape(){
return new Rectangle2D.Double(500,500,200,600);
}
/*public TrafficLight(Color RedColor, Color YellowColor, Color GreenColor,
int RedxLCord, int RedyLCord, int RedLDiam,
int YellowxLCord, int YellowyLCord, int YellowLDiam,
int GreenxLCord, int GreenyLCord, int GreenLDiam)
{
}*/
public TrafficLight() {
}
/*public void paintComponent (Graphics g) {
super.paintComponent(g);
g.drawRect(10,20,10,10);
g.fillRect(10,20,10,10);
}*/
public void drawLight(Graphics2D g2, Color Colour, int RedxLCord, int RedyLCord, int RedLDiam, int RedLDiam1 ) {
g2.setColor( Colour );
g2.fillOval(RedxLCord,RedyLCord,RedLDiam1,RedLDiam1);
}
}
SimulationFrame.java
import java.awt.*;
import java.awt.Canvas;
import javax.swing.JFrame;
@SuppressWarnings("serial")
public class SimulationFrame extends JFrame{
/**
* @param args
*/
Canvas c;
public SimulationFrame() {
c = new TrafficCanvas();
add(c,BorderLayout.CENTER);
setSize(1000,800);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setVisible(true);
}
// This is the Main class which runs the program & creates a window on screen
public static void main(String[] args) {
SimulationFrame frame = new SimulationFrame();
}// end main method
} // end class SimulationFrame
编辑：
灯光正在显示，但我无法让它们改变 - 我在这里有一个TrafficController线程：
public void run(Graphics2D g) {
// Graphics2D g = null;
// g3.drawString("TrafficController",400,300);
// Graphics2D g3=(Graphics2D)g;
TrafficLight tr1 = (TrafficLight)t1;
t1.drawLight(g,3);// show green
try {
sleep(500);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
t1.drawLight(g,2);// show yellow
try {
Thread.sleep(200);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
t1.drawLight(g,1);// show red
try {
Thread.sleep(150);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
repaint();
}
答案 0 :(得分：0)
不试图了解发布的大量代码，有一点你应该改变。 AWT / Swing要求所有GUI操作都在AWT事件队列线程上发生。只要您有自己的线程直接调用AWT / Swing方法，您就会看到各种随机更新/绘制问题，如果不是更糟。
对于一个非常简单的一次性代码，您可能会完全在事件队列线程上运行所有内容（代价是在模拟某些内容时无响应的GUI）。否则，您可能希望有两个线程，一个（实际上，您的应用程序的主线程）执行模拟，另一个是您执行所有GUI更新的事件队列。
有助于您开始设计：http://en.wikipedia.org/wiki/Event_dispatching_thread