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package horstmann.ch08_graphed;
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.geom.Ellipse2D;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;
/**
A circular node that is filled with a color.
*/
@SuppressWarnings("serial")
public class CircleNode implements Node
{
/**
Construct a circle node with a given size and color.
@param aColor the fill color
*/
public CircleNode(Color aColor)
{
size = DEFAULT_SIZE;
x = 0;
y = 0;
color = aColor;
}
public Object clone()
{
try
{
return super.clone();
}
catch (CloneNotSupportedException exception)
{
return null;
}
}
public void draw(Graphics2D g2)
{
Ellipse2D circle = new Ellipse2D.Double(
x, y, size, size);
Color oldColor = g2.getColor();
g2.setColor(color);
g2.fill(circle);
g2.setColor(oldColor);
g2.draw(circle);
}
public void translate(double dx, double dy)
{
x += dx;
y += dy;
}
public boolean contains(Point2D p)
{
Ellipse2D circle = new Ellipse2D.Double(
x, y, size, size);
return circle.contains(p);
}
public Rectangle2D getBounds()
{
return new Rectangle2D.Double(
x, y, size, size);
}
public Point2D getConnectionPoint(Point2D other)
{
double centerX = x + size / 2;
double centerY = y + size / 2;
double dx = other.getX() - centerX;
double dy = other.getY() - centerY;
double distance = Math.sqrt(dx * dx + dy * dy);
if (distance == 0) return other;
else return new Point2D.Double(
centerX + dx * (size / 2) / distance,
centerY + dy * (size / 2) / distance);
}
private double x;
private double y;
private double size;
private Color color;
private static final int DEFAULT_SIZE = 20;
}
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