Using Objects - Java Concepts - page 91

Ellipse2D.Double and Line2D.Double are classes that describe graphical shapes.

import java.awt.geom.Ellipse2D;

Drawing an ellipse is easy: Use exactly the same draw method of the Graphics2D
class that you used for drawing rectangles.

g2.draw(ellipse);

To draw a circle, simply set the width and height to the same values:

Ellipse2D.Double circle = new Ellipse2D.Double(x, y,
diameter, diameter);
g2.draw(circle);

Figure 24

Basepoint and Baseline

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Notice that ( x, y ) is the top-left corner of the bounding box, not the center of the
circle.

To draw a line, use an object of the Line2D.Double class. A line is constructed by
specifying its two end points. You can do this in two ways. Simply give the x- and
y-coordinates of both end points:

Line2D.Double segment = new Line2D.Double(x1, y1, x2,
y2);

Or specify each end point as an object of the Point2D.Double class:

Point2D.Double from = new Point2D.Double(x1, y1);
Point2D.Double to = new Point2D.Double(x2, y2);