package swingExamples;

import java.awt.Color;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.Insets;

import javax.swing.JFrame;
import javax.swing.JPanel;

class ColorTextDisplayPanel extends JPanel
{
  public void paintComponent(Graphics g)
  {
    if (fm == null)
    {
      fm = g.getFontMetrics(f);
      fim = g.getFontMetrics(fi);
    }
    
    String s1 = "Greetings from ";
    String s2 = "JavaLand";
    String s3 = " !";
    int w1 = fm.stringWidth(s1);
    int w2 = fim.stringWidth(s2);
    int w3 = fm.stringWidth(s3);
    // Determine the size of the client area
    Dimension d = getSize();
    Insets   in = getInsets();
    int client_width  = d.width - in.right - in.left;
    int client_height = d.height - in.bottom - in.top;
    int cx = (client_width - w1 - w2 - w3)/2;
    int cy = client_height/2;
    // Draw a green rectangle
    // Save the current color so we can later reset it.
    Color originalColor = g.getColor();
    g.setColor(Color.GREEN);
    g.drawRect(10, 10, client_width - 20, client_height - 20);
    // Restore the original color
    g.setColor(originalColor);
    // Now draw the first part of the string in the default color
    g.setFont(f);
    g.drawString(s1, cx, cy);
    cx += w1;
    // Draw the second part of the string in magenta
    g.setColor(Color.MAGENTA);
    g.setFont(fi);
    g.drawString(s2, cx, cy);
    cx += w2;
    // Draw the third part of the string in the original color
    g.setColor(originalColor);
    g.setFont(f);
    g.drawString(s3, cx, cy);
  }
  
  private Font f = new Font("Serif", Font.BOLD, 16);
  private Font fi = new Font("Serif", Font.BOLD | Font.ITALIC, 16);
  private FontMetrics fm;
  private FontMetrics fim;
}

class ColorTextDisplayFrame extends JFrame
{
  public ColorTextDisplayFrame()
  {
    setTitle("ColorTextDisplay");
    setSize(300, 200);
    setDefaultCloseOperation(EXIT_ON_CLOSE);
    Container contentPane = getContentPane();
    contentPane.add( new ColorTextDisplayPanel() );
  }
}

public class ColorTextDisplay
{
  public static void main(String[] args)
  {
    ColorTextDisplayFrame frame = new ColorTextDisplayFrame();
    frame.setVisible(true);
  }
}