Java Reference
In-Depth Information
LISTING 8.16
continued
private int [] xFlame = {70, 70, 75, 80, 90, 100, 110, 115, 120,
130, 130};
private int [] yFlame = {155, 170, 165, 190, 170, 175, 160, 185,
160, 175, 155};
//-----------------------------------------------------------------
// Constructor: Sets up the basic characteristics of this panel.
//-----------------------------------------------------------------
public RocketPanel()
{
setBackground (Color.black);
setPreferredSize ( new Dimension(200, 200));
}
//-----------------------------------------------------------------
// Draws a rocket using polygons and polylines.
//-----------------------------------------------------------------
public void paintComponent (Graphics page)
{
super .paintComponent (page);
page.setColor (Color.cyan);
page.fillPolygon (xRocket, yRocket, xRocket.length);
page.setColor (Color.gray);
page.fillPolygon (xWindow, yWindow, xWindow.length);
page.setColor (Color.red);
page.drawPolyline (xFlame, yFlame, xFlame.length);
}
}
The xFlame and yFlame arrays define the points of a polyline that are used to
create the image of flame shooting out of the tail of the rocket. Because it is drawn
as a polyline, and not a polygon, the flame is not closed or filled.
The Polygon Class
A polygon can also be defined explicitly using an object of the Polygon class,
which is defined in the java.awt package of the Java standard class library. Two
versions of the overloaded drawPolygon and fillPolygon methods take a single
Polygon object as a parameter.
 
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