Developing a MIDlet that draws an Arc on the Screen
Program:
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
public class ArcExample extends MIDlet
{
private Display display;
private MyCanvas canvas;
public ArcExample()
{
display = Display.getDisplay(this);
canvas = new MyCanvas (this);
}
protected void startApp()
{
display.setCurrent( canvas );
}
protected void pauseApp()
{
}
protected void destroyApp( boolean unconditional )
{
}
public void exitMIDlet()
{
destroyApp(true);
notifyDestroyed();
}
}
class MyCanvas extends Canvas implements CommandListener
{
private Command exit;
private ArcExample arcExample;
public MyCanvas (ArcExample arcExample)
{
this.arcExample = arcExample;
exit = new Command("Exit", Command.EXIT, 1);
addCommand(exit);
setCommandListener(this);
}
protected void paint(Graphics graphics)
{
graphics.setColor(255,255,255);
graphics.fillRect(0, 0, getWidth(), getHeight());
graphics.setColor(255,0,0);
graphics.drawArc(0, 0, getWidth(), getHeight(), 180, 180);
}
public void commandAction(Command command, Displayable displayable)
{
if (command == exit)
{
arcExample.exitMIDlet();
}
}
}
