The Big Programming Thread - Page 818

import java.awt.Color;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;

import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class GraphGUI extends JPanel {

	public static int x;
	public static int y;

	public static JFrame window = new JFrame();

	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;

	public void paintComponent(Graphics g) {
		setSize(100, 100);
		g.setColor(Color.red);
		g.drawOval(x, y, 50, 50);
	}

	public GraphGUI() {

	}

	public static void main(String[] args) {
		window.setSize(500, 500);
		window.addMouseListener(m);
		window.validate();
		window.setVisible(true);

	}

	public static MouseListener m = new MouseListener() {

		@Override
		public void mouseClicked(MouseEvent e) {
			if (e.getButton() == 1) {
				x = e.getX();
				y = e.getY();

				GraphGUI g = new GraphGUI();
				window.add(g);
				window.revalidate();
			}

		}

		@Override
		public void mouseEntered(MouseEvent e) {
		}

		@Override
		public void mouseExited(MouseEvent e) {
		}

		@Override
		public void mousePressed(MouseEvent e) {
		}

		@Override
		public void mouseReleased(MouseEvent e) {
		}
	};

}

import java.awt.Color;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;

public class ClickWindow {
	
	public static void main(String[] args) {
		// all Swing applications must be started this way to 
		// make sure the application runs on the EventDispatcherThread (EDT)
		// if the application does not run on the EDT the behavior of 
		// Swing is not defined
		EventQueue.invokeLater(() -> new ClickWindow());
	}
	
	private final JFrame frame = new JFrame();
	
	public ClickWindow() {
		// make sure the JVM ends when the frame is closed
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		// use some arbitrary size for testing
		frame.setSize(640, 480);
		// center the frame on screen
		frame.setLocationRelativeTo(null);
		
		// set our custom JPanel to be the content-pane (the root element) of our frame
		frame.setContentPane(new ClickPanel());
		
		// show the frame
		frame.setVisible(true);
	}
	
	public static class ClickPanel extends JPanel {
		
		private int x, y;
		
		public ClickPanel() {
			// A MouseAdapter is just an abstract class of MouseListener 
			// with empty implementations for all methods
			addMouseListener(new MouseAdapter() {
				public void mouseClicked(MouseEvent e) {
					// we check for left-click
					if (SwingUtilities.isLeftMouseButton(e)) {
						// we take the X- and Y-coordinates from the event
						x = e.getX();
						y = e.getY();
						
						// we need to repaint our ClickPanel 
						// when we want to draw a new dot
						repaint();
					}
				}
			});
		}
		
		public void paintComponent(Graphics g) {
			// renders the border and background
			super.paintComponent(g);
			// renders our colored point
			g.setColor(Color.RED);
			g.drawOval(x, y, 50, 50);
		}
		
	}
	
}

public class GraphGUI extends JPanel {

    private Point circleLocation = null;

    @Override
    public void paintComponent(Graphics g) {
        if (circleLocation != null) {
            g.setColor(Color.red);
            g.drawOval(circleLocation.x, circleLocation.y, 50, 50);
        }
    }

    public GraphGUI() {
        addMouseListener(new MouseAdapter() {
            @Override
            public void mouseClicked(MouseEvent e) {
                if (e.getButton() == 1) {
                    circleLocation = new Point(e.getX(), e.getY());
                    repaint();
                }
            }
        })
    }

    public static void main(String[] args) {
        JFrame window = new JFrame();
        window.setSize(500, 500);
        window.setVisible(true);
        window.add(new GraphGUI());
        window.revalidate();
    }
}