?? drawtest.java
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/**
@version 1.31 2004-05-03
@author Cay Horstmann
*/
import java.awt.*;
import java.awt.geom.*;
import javax.swing.*;
public class DrawTest
{
public static void main(String[] args)
{
DrawFrame frame = new DrawFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
}
/**
A frame that contains a panel with drawings
*/
class DrawFrame extends JFrame
{
public DrawFrame()
{
setTitle("DrawTest");
setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);
// add panel to frame
DrawPanel panel = new DrawPanel();
add(panel);
}
public static final int DEFAULT_WIDTH = 400;
public static final int DEFAULT_HEIGHT = 400;
}
/**
A panel that displays rectangles and ellipses.
*/
class DrawPanel extends JPanel
{
public void paintComponent(Graphics g)
{
super.paintComponent(g);
Graphics2D g2 = (Graphics2D) g;
// draw a rectangle
double leftX = 100;
double topY = 100;
double width = 200;
double height = 150;
Rectangle2D rect = new Rectangle2D.Double(leftX, topY, width, height);
g2.draw(rect);
// draw the enclosed ellipse
Ellipse2D ellipse = new Ellipse2D.Double();
ellipse.setFrame(rect);
g2.draw(ellipse);
// draw a diagonal line
g2.draw(new Line2D.Double(leftX, topY, leftX + width, topY + height));
// draw a circle with the same center
double centerX = rect.getCenterX();
double centerY = rect.getCenterY();
double radius = 150;
Ellipse2D circle = new Ellipse2D.Double();
circle.setFrameFromCenter(centerX, centerY, centerX + radius, centerY + radius);
g2.draw(circle);
}
}
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