BufferedDraw.java Source code

Introduction

Here is the source code for BufferedDraw.java

Source

import java.awt.BasicStroke;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.image.BufferedImage;

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

public class BufferedDraw extends JPanel implements MouseListener, MouseMotionListener {
    Rectangle rect = new Rectangle(0, 0, 100, 50);

    BufferedImage bi = new BufferedImage(5, 5, BufferedImage.TYPE_INT_RGB);

    Graphics2D big;

    int last_x, last_y;

    boolean firstTime = true;

    Rectangle area;

    boolean pressOut = false;

    public BufferedDraw() {
        setBackground(Color.white);
        addMouseMotionListener(this);
        addMouseListener(this);
    }

    // Handles the event of the user pressing down the mouse button.
    public void mousePressed(MouseEvent e) {

        last_x = rect.x - e.getX();
        last_y = rect.y - e.getY();

        // Checks whether or not the cursor is inside of the rectangle while the
        // user is pressing themouse.
        if (rect.contains(e.getX(), e.getY())) {
            updateLocation(e);
        } else {
            pressOut = true;
        }
    }

    // Handles the event of a user dragging the mouse while holding down the
    // mouse button.
    public void mouseDragged(MouseEvent e) {

        if (!pressOut) {
            updateLocation(e);
        }
    }

    // Handles the event of a user releasing the mouse button.
    public void mouseReleased(MouseEvent e) {
        if (rect.contains(e.getX(), e.getY())) {
            updateLocation(e);
        }
    }

    public void mouseMoved(MouseEvent e) {
    }

    public void mouseClicked(MouseEvent e) {
    }

    public void mouseExited(MouseEvent e) {
    }

    public void mouseEntered(MouseEvent e) {
    }

    public void updateLocation(MouseEvent e) {

        rect.setLocation(last_x + e.getX(), last_y + e.getY());
        repaint();
    }

    public void paint(Graphics g) {
        update(g);
    }

    public void update(Graphics g) {
        Graphics2D g2 = (Graphics2D) g;

        if (firstTime) {
            Dimension dim = getSize();
            int w = dim.width;
            int h = dim.height;
            area = new Rectangle(dim);
            bi = (BufferedImage) createImage(w, h);
            big = bi.createGraphics();
            rect.setLocation(w / 2 - 50, h / 2 - 25);
            big.setStroke(new BasicStroke(8.0f));
            firstTime = false;
        }

        big.setColor(Color.white);
        big.clearRect(0, 0, area.width, area.height);

        big.setPaint(Color.red);
        big.draw(rect);
        big.setPaint(Color.blue);
        big.fill(rect);

        g2.drawImage(bi, 0, 0, this);
    }

    private boolean checkRect() {
        if (area == null) {
            return false;
        }
        if (area.contains(rect.x, rect.y, 100, 50)) {
            return true;
        }
        int new_x = rect.x;
        int new_y = rect.y;

        if ((rect.x + 100) > area.width) {
            new_x = area.width - 99;
        }
        if (rect.x < 0) {
            new_x = -1;
        }
        if ((rect.y + 50) > area.height) {
            new_y = area.height - 49;
        }
        if (rect.y < 0) {
            new_y = -1;
        }
        rect.setLocation(new_x, new_y);
        return false;
    }

    public static void main(String s[]) {

        JFrame f = new JFrame("BufferedShapeMover");
        f.addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });
        f.getContentPane().setLayout(new BorderLayout());
        f.getContentPane().add(new BufferedDraw(), "Center");

        f.pack();
        f.setSize(new Dimension(550, 250));
        f.show();
    }

}