Core Web Programming, Second Edition

10.2. Drawing Shapes

With the AWT, you generally drew a shape by calling the drawXxx or fillXxx method of the Graphics object. In Java 2D, you generally create a Shape object, then call either the draw or fill method of the Graphics2D object, supplying the Shape object as an argument. For example:

public void paintComponent(Graphics g) {
  super.paintComponent(g);
  Graphics2D g2d = (Graphics2D)g;
  // Assume x, y, and diameter are instance variables.
  Ellipse2D.Double circle =
						new Ellipse2D.double(x, y, diameter, diameter);
						g2d.fill(circle);
  ...
}

Most of the Shape classes define both a Shape.Double and a Shape.Float version of the class. Depending on the version of the class, the coordinate locations are stored as either double precision numbers ...