我希望调整" MyPanel"下的第75行绘制的线条的粗细。您将在评论中找到课程。我对该程序的总体意图是在单击按钮时在屏幕上绘制字母。感谢
public class Painttest extends JFrame {
private Timer timer;
private JPanel panel1, panel2;
private MyPanel center;
private MyButton stop, A, B;
public Painttest() {
this.setSize(650, 700);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setResizable(false);
panel1 = new JPanel();
panel2 = new JPanel();
center = new MyPanel();
center.setBackground(Color.cyan);
stop = new MyButton("Stop");
stop.setName("stop button");
A = new MyButton("A");
A.setName("A Button");
B = new MyButton("B");
B.setName("B Button");
panel1.add(A);
panel1.add(B);
panel2.add(stop);
this.add(panel1, BorderLayout.WEST);
this.add(center, BorderLayout.CENTER);
this.add(panel2, BorderLayout.EAST);
timer = new Timer(50, center);
this.setVisible(true);
System.out.println(center.getSize()); // size of center panel
}
public static void main(String[] args) {
new Painttest();
}
///////////////////////////////////////////////////////////////////////
// MyPanel class : This panel will be used to draw on
////////////////////////////////////////////////////////////////////////
private class MyPanel extends JPanel implements ActionListener {
private int startingx, startingy;
private int endingx, endingy;
MyPanel() {
startingx = 110;
startingy = 330;
endingx = startingx ;
endingy = startingy ;
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
// g.fillOval(startingx, startingy, 30, 30);
g.drawLine(startingx, startingy, endingx,endingy); // draws a single line
}
@Override
public void actionPerformed(ActionEvent e) {
startingx = startingx + 1;
startingy = startingy - 3;
repaint();
}
}
///////////////////////////////////////////////////////////////////////
// MyButton class : When Clicked, I want it to draw something on the MyPanel (center)
////////////////////////////////////////////////////////////////////////
private class MyButton extends JButton implements ActionListener {
String name;
MyButton(String title) {
super(title);
addActionListener(this);
name = "NOT SET";
}
@Override
public void actionPerformed(ActionEvent e) {
System.out.println("Pressed a button " + name);
////////////////////////////////////
// if Statements to control the timer
////////////////////////////////////
// STOP TIMER
if (e.getSource() == stop) {
timer.stop();
}
if(e.getSource() == A){
timer.start();
}
if(e.getSource() == B){
timer.start();
}
}
public void setName(String newname) {
name = newname;
}
public String getName() {
return name;
}
}
}
答案 0 :(得分:2)
修改paintComponent方法,如下所示:
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g;
g2d.setStroke(new BasicStroke(6.0F));
// g.fillOval(startingx, startingy, 30, 30);
g2d.drawLine(startingx, startingy, endingx, endingy);
}
您可以设置各种笔画。基本笔划是粗实线。