如何更改JPanel的字体大小

Question

I am trying to create a JPanel with varying font sizes, without using JLabels .

Below is a representation of what the code looks like.

public class MyPanel extends JPanel{

    public MyPanel(string title){
        JFrame frame = new JFrame(title);
        frame.setExtendedState(Frame.MAXIMIZED_BOTH);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.pack();
        frame.setVisible(true);
    }

    public void paintComponent(Graphics graphics){
        graphics.drawString("Some Text",100,100);
        // Should decrease font size
        graphics.drawString("Some Smaller Text",200,200);
        // Should increase font size
        graphics.drawString("Some Bigger Text",300,300);
    }
}

Answer 1

add this in void paint() method

  float f=20.0f; // font size.
   g.setFont(g.getFont().deriveFont(f);
   g.drawString("whatever",150,f+10);// provides optimum gap for printing

Done...

Answer 2

It looks like you are drawing text directly to the Canvas. To change the font size when drawing with a java.awt.Graphics object, you need to change the current font.

For instance:

public  void paint(Graphics g){
   Font font = new Font("Verdana", Font.BOLD, 12);
   g.setFont(font);
   g.drawString("bla bla",150,10);
}

Ideally, you should declare the font object as an instance variable instead of creating a new font every time paint is called.

Answer 3

You can call the method setFont() from you JPanel and give it a Font as parameter. Example :

setFont(new java.awt.Font("Century Schoolbook L", 2, 24));

The first argument is the font name, the second is for the style and the last one is for the size.