我正在尝试模拟一个十字路口,到目前为止我已经画了我的路口。现在我想让交通灯亮起来。问题是我无法让我的圆圈每隔X秒就将颜色从绿色变为红色。 请帮帮我。
import java.awt.Color;
import javax.jws.Oneway;
import javax.swing.JFrame;
public class Main {
public static void main(String[] args) {
MyMap map = new MyMap();
JFrame f = new JFrame("Broadway Intersection");
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
map.setBackground(Color.white);
f.add(map);
f.setSize(1366,738);
f.setVisible(true);
}
}
My Map class
import java.awt.Color;
import java.awt.Graphics;
import java.util.Timer;
import java.util.TimerTask;
import javax.swing.JPanel;
public class MyMap extends JPanel {
public void paintComponent(final Graphics g) {
super.paintComponent(g);
g.setColor(Color.GREEN);
g.fillRect(0, 0, 500, 250); // stanga sus
g.fillRect(900, 0, 500, 250); // dreapta sus
g.fillRect(0, 500, 500, 250);// stanga jos
g.fillRect(900, 500, 500, 250); // dreapta jos
g.setColor(Color.GRAY);
g.fillRect(500, 0, 400, 900);
g.fillRect(0, 250, 500, 250);
g.fillRect(900, 250, 500, 250);
g.setColor(Color.WHITE);
g.fillRect(695, 0, 5, 100);// linii verticale
g.fillRect(695, 150, 5, 100);
g.fillRect(695, 500, 5, 100);
g.fillRect(695, 650, 5, 50);
g.fillRect(0, 370, 50, 5);
g.fillRect(100, 370, 100, 5); // linii orizontale
g.fillRect(250, 370, 100, 5);
g.fillRect(400, 370, 100, 5);
g.fillRect(900, 370, 100, 5);
g.fillRect(1050, 370, 100, 5);
g.fillRect(1200, 370, 100, 5);
Timer timer = new Timer();
boolean semaphore =true;
timer.schedule(new TimerTask() {
@Override
public void run() {
g.setColor(Color.RED);
g.fillOval(700, 400, 20, 20);
System.out.println("tic tac");
}
}, 0, 5000);
g.setColor(Color.GREEN);
g.fillOval(700, 400, 20, 20);
}
}
我在中心有一个圆圈,我想改变它的颜色,而不是我开始绘制我的红绿灯:D感谢所有帮助的人。
答案 0 :(得分:2)
尝试将Timer
放在paintComponent()
之外,并将Color
个对象作为类成员,以便可以在Timer
和paintComponent
中访问它。当计时器到达它的标记时,它会改变颜色,然后调用repaint
。尝试这样的事情(未经测试)
import java.awt.Color;
import java.awt.Graphics;
import java.util.Timer;
import java.util.TimerTask;
import javax.swing.JPanel;
public class MyMap extends JPanel {
Color color = Color.GREEN; <-- class member
public MyMap(){
Timer timer = new Timer();
boolean semaphore =true; <-- not sure what this is for so I left it
timer.schedule(new TimerTask() {
@Override
public void run() {
color = Color.RED; <-- change color
repaint(); <-- repaint();
System.out.println("tic tac");
}
}, 0, 5000);
}
public void paintComponent(final Graphics g) {
super.paintComponent(g);
g.setColor(Color.GREEN);
g.fillRect(0, 0, 500, 250); // stanga sus
g.fillRect(900, 0, 500, 250); // dreapta sus
g.fillRect(0, 500, 500, 250);// stanga jos
g.fillRect(900, 500, 500, 250); // dreapta jos
g.setColor(Color.GRAY);
g.fillRect(500, 0, 400, 900);
g.fillRect(0, 250, 500, 250);
g.fillRect(900, 250, 500, 250);
g.setColor(Color.WHITE);
g.fillRect(695, 0, 5, 100);// linii verticale
g.fillRect(695, 150, 5, 100);
g.fillRect(695, 500, 5, 100);
g.fillRect(695, 650, 5, 50);
g.fillRect(0, 370, 50, 5);
g.fillRect(100, 370, 100, 5); // linii orizontale
g.fillRect(250, 370, 100, 5);
g.fillRect(400, 370, 100, 5);
g.fillRect(900, 370, 100, 5);
g.fillRect(1050, 370, 100, 5);
g.fillRect(1200, 370, 100, 5);
g.setColor(color); <--- just use your color variable
g.fillOval(700, 400, 20, 20);
}
}
编辑:尝试使用Swing Timer而不是java.util.Timer
Timer timer = new Timer(5000, new ActionListener(){
public void actionPerformed(ActionEvent e){
color = Color.GREEN;
repaint();
}
});
timer.setRepeats(false);
timer.start();
编辑2:保持交替
Timer timer = new Timer(5000, new ActionListener(){
public void actionPerformed(ActionEvent e){
if (color.equals(Color.GREEN){
color = Color.RED;
} else {
color = Color.GREEN;
}
repaint();
}
});
timer.start();
编辑3:不同的时间延迟
Color color = Color.GREEN;
Timer timer;
public MyMap() {
timer = null;
timer = new Timer(5000, new ActionListener(){
public void actionPerformed(ActionEvent e) {
if (color.equals(Color.GREEN)) {
color = Color.RED;
timer.setDelay(2000);
} else {
color = Color.GREEN;
timer.setDelay(8000);
}
repaint();
}
});
timer.start();
}