import java.applet.Applet;
import java.awt.*;
public class step3 extends Applet{
// handles button events and adds clear function
Button button = new Button ("Clear");
Panel buttonPanel = new Panel ( );
MyPanel2 drawPanel = new MyPanel2 ();
public void init ( ){
drawPanel.setBackground (Color.white);
button.setBackground (Color.green);
button.setFont ( new Font ("Helvetica", Font.BOLD, 18) );
buttonPanel.add (button);
setLayout (new BorderLayout ( ) );
add ("North", buttonPanel);
add ("Center", drawPanel);
} // end init
public boolean action (Event event, Object arg) {
if (event.target == button ) {
return drawPanel.clear ( );
} // end if
else return false;
} // end action
}// end step3
class MyPanel3 extends Panel {
int last_x = 0;
int last_y = 0;
int x = 0;
int y = 0;
public boolean mouseDown ( Event event, int x, int y ) {
last_x = x;
last_y = y;
return true;
} // end mouseDown
public boolean mouseDrag ( Event event, int x, int y ) {
Graphics g = getGraphics ( );
g.drawLine ( last_x, last_y, x, y );
last_x = x;
last_y = y;
return true;
} // end mosueDrag
public boolean clear ( ) {
Graphics g = getGraphics ( );
Rectangle r = this.bounds ( );
g.setColor ( this.getBackground ( ) );
g.fillRect ( 0, 0, r.width, r.height );
g.setColor ( this.getForeground ( ) );
return true;
} // end clear
} // end MyPanel3