1 java swing paint event-dispatch-thread japplet
我正在尝试为java创建一个程序,我有闪烁的常见问题.我尝试过很多东西要消除,但都是一样的.而我画的椭圆正在移动japplet是闪烁的.我需要你的帮助来解决这个问题.这是我的代码:
import java.awt.Color;
public class all extends JApplet implements Runnable {
double x=0;
double y=0;
int m=0;
int n=0;
int f=30;
int ?=0;
Thread kinisi;
JPanel panel;
JFrame frame;
private boolean running = false;
private JTextField textField1;
private JTextField textField2;
Image backGround;
JPanel panel_3;
Image bf = createImage(m, n);
private Graphics doubleg;
private Image i;
public void init() {
this.setSize(800, 700);
}
public all() {
getContentPane().setLayout(null);
JButton btnNewButton = new JButton("Start");
btnNewButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
String b=textField2.getText();
String z =textField1.getText();
if (textField1.getText().equals("") ||
textField2.getText().equals("")){
JOptionPane.showMessageDialog(
new JFrame(),
"????? ???? ??? ?? ? ??? ?? ?!",
"ERROR",JOptionPane.ERROR_MESSAGE);
} else{
f = Integer.parseInt(b);
? = Integer.parseInt(z);
Start(); }
}
});
btnNewButton.setBounds(469, 168, 89, 23);
getContentPane().add(btnNewButton);
JButton btnStop = new JButton("Pause");
btnStop.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
pause();
}
});
btnStop.setBounds(588, 168, 89, 23);
getContentPane().add(btnStop);
JButton btnReset = new JButton("Reset");
btnReset.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
Reset();
}
});
btnReset.setBounds(701, 168, 89, 23);
getContentPane().add(btnReset);
JLabel label = new JLabel("\u03BC");
label.setHorizontalAlignment(SwingConstants.CENTER);
label.setBounds(549, 63, 46, 14);
getContentPane().add(label);
textField1 = new JTextField();
textField1.setBounds(529, 101, 86, 20);
getContentPane().add(textField1);
textField1.setColumns(10);
JLabel label_1 = new JLabel("\u03C6");
label_1.setHorizontalAlignment(SwingConstants.CENTER);
label_1.setBounds(681, 63, 46, 14);
getContentPane().add(label_1);
textField2 = new JTextField();
textField2.setBounds(667, 101, 86, 20);
getContentPane().add(textField2);
textField2.setColumns(10);
JButton btnNewButton_1 = new JButton("");
btnNewButton_1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
JOptionPane.showMessageDialog(
new JFrame(),
"??????? ????????????","???????",
JOptionPane.INFORMATION_MESSAGE);
}
});
btnNewButton_1.setIcon(
new ImageIcon(all.class.getResource("/Images/info.png")));
btnNewButton_1.setBounds(732, 5, 39, 35);
getContentPane().add(btnNewButton_1);
JLabel label_2 = new JLabel("");
label_2.setIcon(
new ImageIcon(all.class.getResource("/Images/earth.jpg")));
label_2.setBounds(-20, 0, 820, 361);
getContentPane().add(label_2);
JPanel panel_1 = new JPanel();
panel_1.setBorder(
new BevelBorder(BevelBorder.LOWERED, null, null, null, null));
panel_1.setBounds(10, 372, 369, 290);
getContentPane().add(panel_1);
JPanel panel_2 = new JPanel();
panel_2.setBorder(
new BevelBorder(BevelBorder.LOWERED, null, null, null, null));
panel_2.setBounds(408, 372, 369, 290);
getContentPane().add(panel_2);
}
public void paint(Graphics g){
super.paint(g);
g.drawLine(0,f,350,200);
g.drawLine(0,200,350,200);
g.drawOval(m,n,40,40);
Color brown=new Color(137,66,0);
g.setColor(brown);
g.fillOval(m, n, 40, 40);
//Graphics2D g2d = (Graphics2D) g;
g.drawLine(460,400,460,650);
g.drawLine(20, 620, 350, 620);
g.drawLine(50,400,50,650);
g.drawLine(430, 620, 760, 620);
}
public void Start() {
kinisi = new Thread(this);
kinisi.start();
running = true;
}
public void run() {
while (running) {
if (x < 340){
double l = 200-f;
double k = l/350;
double y=k*x+f-30;
x= x+1;
m = (int) x;
n = (int) y;
repaint();
try {
Thread.sleep(?);
} catch (InterruptedException ie) {}
}
}
}
public void update(Graphics g) {
if(i==null){
i=createImage(800,700);
doubleg = i.getGraphics();
}
doubleg.setColor(getBackground());
doubleg.fillRect(0,0,800,700);
doubleg.setColor(getForeground());
paint(doubleg);
g.drawImage(i,0,0,this);
}
public void paint1(Graphics g){
g.drawLine(0, f ,350, 200);
g.drawOval(m, n, 40, 40);
Color brown=new Color(137,66,0);
g.setColor(brown);
g.fillOval(m, n, 40, 40);
}
public void pause() {
if (kinisi != null) {
running = false;
}
}
public boolean Reset() {
if (kinisi != null) {
running = false;
kinisi.interrupt();
kinisi = null;
x=0;
y=0;
f=30;
m=0;
n=0;
repaint();
textField1.setText("");
textField2.setText("");
}
Graphics g = getGraphics();
g.drawOval(m,n,40,40);
Color brown=new Color(137,66,0);
g.setColor(brown);
g.fillOval(m, n, 40, 40);
return false;
}
public static void main(String[] args) {
JFrame frame = new JFrame("FISIKI");
frame.getContentPane().add(new all());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(800, 700);
frame.setVisible(true);
frame.setResizable(false);
}
}
非常感谢,抱歉我的英语不是很好!
Mad*_*mer 11
有很多事情在我身上跳出来.
JApplet,但正在将它添加到JFramegetGraphics.首先...
你永远不应该覆盖paint顶级容器(如JApplet).有很多原因,你找到了一个.顶级容器不是双缓冲的.相反,你应该创建一个自定义组件(通过扩展类似的东西JPanel)并覆盖它的paintComponent方法......
其次
决定你的申请将如何.它是applet还是应用程序？如果你遵循第一点,那么它真的没关系,因为你只需要将面板添加到顶级容器.
第三
我会创建一个自定义绘画的面板.然后我会为所有字段和应用程序的其他部分创建单独的容器.这将允许您分离责任区域.它还允许您使用布局管理器;)
第四
使用布局管理器.布局管理器API旨在解决GUI设计中最令人烦恼的一个方面,你要求很多麻烦并且工作你决定丢弃它 - 恕我直言.
第五
getGraphics永远不应该使用.除了可以返回之外null,它只是屏幕上当前显示的内容的快照.一旦RepaintManager决定执行重绘,任何呈现给它的东西都将丢失.您应该使用paintComponent更新自定义窗格的状态.