displaypanel.java~1~

来自「这是各类实用工具的源码100例」· JAVA~1~ 代码 · 共 44 行

package jfontstextdemo;

import java.awt.*;
import javax.swing.JPanel;

public class DisplayPanel extends JPanel {

  private Font font;

  public DisplayPanel() {
    try {
      jbInit();
    }
    catch(Exception ex) {
      ex.printStackTrace();
    }
  }
  void jbInit() throws Exception {
    font = new Font("Arial", Font.PLAIN, 10);

  }
  public void changeFont(String f, int st, String si){
    Integer newSize = new Integer(si);
    int size = newSize.intValue();
    font = new Font(f, st, size);
    repaint();
}

public void paintComponent (Graphics g) {
    super.paintComponent( g );
    Graphics2D g2 = (Graphics2D) g;
    int w = getWidth();
    int h = getHeight();

    g2.setColor(Color.darkGray);
    g2.setFont(font);
    String change = "Pick a font, size, and style to change me";
    FontMetrics metrics = g2.getFontMetrics();
    int width = metrics.stringWidth( change );
    int height = metrics.getHeight();
    g2.drawString( change, w/2-width/2, h/2-height/2 );
}

}