Mega Code Archive
Draw with Line2D Double and Ellipse2D Double
<![CDATA[
/*
This program is a part of the companion code for Core Java 8th ed.
(http://horstmann.com/corejava)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.geom.Ellipse2D;
import java.awt.geom.Line2D;
import java.awt.geom.Rectangle2D;
import javax.swing.JComponent;
import javax.swing.JFrame;
/**
* @version 1.32 2007-04-14
* @author Cay Horstmann
*/
public class DrawTest {
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
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
DrawComponent component = new DrawComponent();
add(component);
}
public static final int DEFAULT_WIDTH = 400;
public static final int DEFAULT_HEIGHT = 400;
}
/**
* A component that displays rectangles and ellipses.
*/
class DrawComponent extends JComponent {
public void paintComponent(Graphics 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);
}
}
]]>