import java.applet.*;
import java.awt.*;
import java.awt.event.*;

public class font_measure extends Applet implements ActionListener {

LabelCanvas myLabel;
Button b;
int canvasHeight = 30;
	
public void init() 
{
	setBackground(new Color(240, 225, 255));
	myLabel = new LabelCanvas("Text should just fit horizontally on the Canvas");
	myLabel.setBackground(Color.cyan);
	add(myLabel);
	b = new Button(getButtonLabel());
	b.addActionListener(this);
	add(b);
	invalidate();
	validate();
}

String getButtonLabel()
{
	return("Canvas height " + canvasHeight);
}

public void actionPerformed(ActionEvent ae)
{
	if (ae.getSource() == b)
	{
		canvasHeight--;
		if (canvasHeight < 10) canvasHeight = 40;
		b.setLabel(getButtonLabel());
		myLabel.setHeight(canvasHeight);
		myLabel.invalidate();
		invalidate();
		validate();
	}
}

public final void paint(Graphics g)
{
	g.drawString("width of box = " + myLabel.width, 10, getSize().height - 25);
	g.drawString("Property apple.awt.textantialiasing = " + System.getProperty("apple.awt.textantialiasing"),
		10, getSize().height - 5);
}	
}  //  END OF Class font_measure



class LabelCanvas extends Canvas  {	
									
int height;
int width;
Font f;
String label;
boolean needToResetWidth;

LabelCanvas(String label)
{
	this.label = label;
	f = new Font("Serif", Font.BOLD, 30);
	height = 30;
	needToResetWidth = true;
}

void setWidth(Graphics g)
{
	g.setFont(f);
	FontMetrics fm = g.getFontMetrics();
	width = fm.stringWidth(label);
	needToResetWidth = false;		
}

void setHeight(int h)
{
	height = h;
	repaint();
}

public void addNotify()
{
	super.addNotify();
	repaint();
}

public final void paint(Graphics g)
{
	g.setFont(f);
	if (needToResetWidth) setWidth(g);
	g.drawString(label, 0, height - 5);
}	

public final Dimension getMinimumSize()
{
	if (needToResetWidth)
	{
		Graphics g = getGraphics();
		setWidth(g);
		g.dispose();
	}
	return (new Dimension(width, height));
}

public final Dimension getPreferredSize()
{
	return(getMinimumSize());
}

public final void update(Graphics g)
{
	paint(g);
}
}  // END OF Class LabelCanvas