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El ejemplo, editado en el archivo grafDemo.java, es:
import java.awt.Graphics;
import java.awt.Color;
import java.awt.Button;
import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.FlowLayout;
import java.awt.Panel;
import java.awt.Label;
import java.awt.Choice;
import java.awt.Font;
import java.awt.Toolkit;
import java.awt.Checkbox;
import java.awt.Scrollbar;
import java.awt.GraphicsEnvironment;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.awt.event.AdjustmentListener;
import java.awt.event.AdjustmentEvent;
import java.applet.*;
public class grafDemo extends Applet
{
Scrollbar R=new Scrollbar(Scrollbar.VERTICAL, 0, 1, 0, 255);
Scrollbar G=new Scrollbar(Scrollbar.VERTICAL, 0, 1, 0, 255);
Scrollbar B=new Scrollbar(Scrollbar.VERTICAL, 0, 1, 0, 255);
Choice FN=new Choice();
Choice GR=new Choice();
Checkbox F=new Checkbox("Figuras cerradas llenas",false);
ent [] puntosX={1,100,200,300,399,300,200,100};
ent [] puntosY={200,150,50,150,200,100,250,130};
ent puntos=8;
public void init()
{
// Calculo los Font del sistema:
// String[] NOMBRES=GraphicsEnvironment.
// getLocalGraphicsEnvironment().
// getAvailableFontFamilyNames();
/*
Para Java presentes en los browser
String [] NOMBRES=Toolkit.getDefaultToolkit().getFontList();
*/
String [] NOMBRES=Toolkit.getDefaultToolkit().getFontList();
try
{
ent índice=0;
while (true)
{
FN.addItem(NOMBRES[índice++]);
}
}
catch (ArrayIndexOutOfBoundsException e)
{};
setLayout(new BorderLayout());
Panel np=new Panel(new GridLayout(1,3));
Panel rojo=new Panel(new FlowLayout());
rojo.add(new Label("Rojo"));
rojo.add(R);
np.add(rojo);
Panel verde=new Panel(new FlowLayout());
verde.add(new Label("Verde"));
verde.add(G);
np.add(verde);
Panel azul=new Panel(new FlowLayout());
azul.add(new Label("Azul"));
azul.add(B);
np.add(azul);
R.setUnitIncrement(10);
R.setValue(255);
G.setUnitIncrement(10);
G.setValue(255);
B.setUnitIncrement(10);
B.setValue(255);
add(np,BorderLayout.SOUTH);
GR.addItem("Línea");
GR.addItem("Rectángulo");
GR.addItem("Rectángulo 3D");
GR.addItem("Rectángulo Redondeado");
GR.addItem("Círculo");
GR.addItem("Elípses");
GR.addItem("Polígono genérico");
GR.addItem("Texto");
GR.addItem("Arco");
Panel up=new Panel(new GridLayout(1,3));
up.add(GR);
up.add(FN);
up.add(F);
add(up,BorderLayout.NORTH);
R.addAdjustmentListener(new AL());
G.addAdjustmentListener(new AL());
B.addAdjustmentListener(new AL());
GR.addItemListener(new IL());
FN.addItemListener(new IL());
F.addItemListener(new IL());
}
public void paint(Graphics g)
{
g.setColor(new Color(255-R.getValue(),
255-G.getValue(),
255-B.getValue()
));
g.setFont(new Font(FN.getSelectedItem(),0,40));
boolean filled=F.getState();
int pg=GR.getSelectedIndex();
g.drawString(GR.getSelectedItem(),1,300);
if (pg==0)
{
g.drawLine(1,100,399,300);
return;
}
if (pg==1)
{
g.drawRect(50,100,250,100);
if (filled) g.fillRect(50,100,250,100);
return;
}
if (pg==2)
{
g.draw3DRect(50,100,250,100,true);
return;
}
if (pg==3)
{
g.drawRoundRect(50,100,300,100,20,20);
if (filled) g.fillRoundRect(50,100,300,100,20,20);
return;
}
if (pg==4)
{
g.drawOval(100,100,200,200);
if (filled) g.fillOval(100,100,200,200);
return;
}
if (pg==5)
{
g.drawOval(100,100,200,100);
if (filled) g.fillOval(100,100,200,100);
return;
}
if (pg==6)
{
g.drawPolygon(puntosX,puntosY,puntos);
if (filled) g.fillPolygon(puntosX,puntosY,puntos);
return;
}
if (pg==7)
{
g.drawString("Ésta es una cadena",1,200);
return;
}
if (pg==8)
{
g.drawArc(1,50,398,200,10,270);
if (filled) g.fillArc(1,50,398,200,10,270);
return;
}
}
public class IL implements ItemListener
{
public void itemStateChanged(ItemEvent e)
{
repaint();
}
}
public class AL implements AdjustmentListener
{
public void adjustmentValueChanged(AdjustmentEvent e)
{
repaint();
}
}
}
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