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MainPanel.java
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MainPanel.java
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// -*- mode:java; encoding:utf-8 -*-
// vim:set fileencoding=utf-8:
// @homepage@
package example;
import java.awt.*;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.geom.Point2D;
import java.awt.image.BufferedImage;
import java.awt.image.ImageProducer;
import java.awt.image.MemoryImageSource;
import javax.swing.*;
public final class MainPanel extends JPanel {
private MainPanel() {
super(new BorderLayout());
add(new PaintPanel());
setPreferredSize(new Dimension(320, 240));
}
public static void main(String[] args) {
EventQueue.invokeLater(MainPanel::createAndShowGui);
}
private static void createAndShowGui() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (UnsupportedLookAndFeelException ignored) {
Toolkit.getDefaultToolkit().beep();
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException ex) {
ex.printStackTrace();
return;
}
JFrame frame = new JFrame("@title@");
frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
frame.getContentPane().add(new MainPanel());
frame.setResizable(false);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
}
class PaintPanel extends JPanel {
private final Point startPoint = new Point();
private final transient BufferedImage backImage;
private static final Paint TEXTURE = createCheckerTexture(6, new Color(0x32_C8_96_64, true));
private final Rectangle rect = new Rectangle(320, 240);
private final int[] pixels;
private final transient ImageProducer src;
private int penColor;
private transient MouseAdapter handler;
protected PaintPanel() {
super();
pixels = new int[rect.width * rect.height];
src = new MemoryImageSource(rect.width, rect.height, pixels, 0, rect.width);
backImage = new BufferedImage(rect.width, rect.height, BufferedImage.TYPE_INT_ARGB);
Graphics2D g2 = backImage.createGraphics();
g2.setPaint(TEXTURE);
g2.fill(rect);
g2.dispose();
}
@Override public void updateUI() {
removeMouseMotionListener(handler);
removeMouseListener(handler);
super.updateUI();
handler = new MouseAdapter() {
@Override public void mousePressed(MouseEvent e) {
startPoint.setLocation(e.getPoint());
penColor = e.getButton() == MouseEvent.BUTTON1 ? 0xFF_00_00_00 : 0x0;
}
@Override public void mouseDragged(MouseEvent e) {
double dx = e.getX() - startPoint.getX();
double dy = e.getY() - startPoint.getY();
double delta = Math.max(Math.abs(dx), Math.abs(dy));
double ix = dx / delta;
double iy = dy / delta;
double sx = startPoint.x;
double sy = startPoint.y;
Point2D pt = new Point2D.Double();
for (int i = 0; i < delta; i++) {
pt.setLocation(sx, sy);
if (!rect.contains(pt)) {
break;
}
paintStamp(pt, penColor);
// src.newPixels(pt.x - 2, pt.y - 2, 4, 4);
sx += ix;
sy += iy;
}
startPoint.setLocation(e.getPoint());
}
};
addMouseMotionListener(handler);
addMouseListener(handler);
}
@Override protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2 = (Graphics2D) g.create();
g2.drawImage(backImage, 0, 0, this);
g2.drawImage(createImage(src), 0, 0, this);
g2.dispose();
}
private void paintStamp(Point2D pt, int color) {
int px = (int) pt.getX();
int py = (int) pt.getY();
// 1 x 1:
// pixels[px + py * 320] = color;
// 3 x 3 square:
for (int n = -1; n <= 1; n++) {
for (int m = -1; m <= 1; m++) {
int t = px + n + (py + m) * rect.width;
if (t >= 0 && t < rect.width * rect.height) {
pixels[t] = color;
}
}
}
repaint(px - 2, py - 2, 4, 4);
}
public static TexturePaint createCheckerTexture(int cs, Color color) {
int size = cs * cs;
BufferedImage img = new BufferedImage(size, size, BufferedImage.TYPE_INT_ARGB);
Graphics2D g2 = img.createGraphics();
g2.setPaint(color);
g2.fillRect(0, 0, size, size);
for (int i = 0; i * cs < size; i++) {
for (int j = 0; j * cs < size; j++) {
if ((i + j) % 2 == 0) {
g2.fillRect(i * cs, j * cs, cs, cs);
}
}
}
g2.dispose();
return new TexturePaint(img, new Rectangle(size, size));
}
}
// class PaintPanel2 extends JPanel implements MouseMotionListener, MouseListener {
// private static final Color ERASER = new Color(0x0, true);
// private boolean isPen = true;
// private final Point startPoint = new Point();
// private final transient BufferedImage currentImage;
// private final transient BufferedImage backImage;
//
// protected PaintPanel2() {
// super();
// addMouseMotionListener(this);
// addMouseListener(this);
// currentImage = new BufferedImage(320, 240, BufferedImage.TYPE_INT_ARGB);
// backImage = new BufferedImage(320, 240, BufferedImage.TYPE_INT_ARGB);
// Graphics2D g2 = backImage.createGraphics();
// g2.setPaint(makeTexturePaint());
// g2.fillRect(0, 0, 320, 240);
// g2.dispose();
// }
//
// private static BufferedImage makeBGImage() {
// Color color = new Color(0x32_C8_96_64, true);
// int cs = 6;
// int sz = cs * cs;
// BufferedImage img = new BufferedImage(sz, sz, BufferedImage.TYPE_INT_ARGB);
// Graphics2D g2 = img.createGraphics();
// g2.setPaint(color);
// g2.fillRect(0, 0, sz, sz);
// for (int i = 0; i * cs < sz; i++) {
// for (int j = 0; j * cs < sz; j++) {
// if ((i + j) % 2 == 0) {
// g2.fillRect(i * cs, j * cs, cs, cs);
// }
// }
// }
// g2.dispose();
// return img;
// }
//
// private static TexturePaint makeTexturePaint() {
// BufferedImage img = makeBGImage();
// return new TexturePaint(img, new Rectangle(img.getWidth(), img.getHeight()));
// }
//
// @Override protected void paintComponent(Graphics g) {
// super.paintComponent(g);
// // if (Objects.nonNull(backImage)) {
// g.drawImage(backImage, 0, 0, this);
// // if (Objects.nonNull(currentImage)) {
// g.drawImage(currentImage, 0, 0, this);
// }
//
// @Override public void mouseDragged(MouseEvent e) {
// Point pt = e.getPoint();
// Graphics2D g2 = currentImage.createGraphics();
// g2.setStroke(new BasicStroke(3f));
// if (isPen) {
// g2.setPaint(Color.BLACK);
// } else {
// g2.setComposite(AlphaComposite.Clear);
// g2.setPaint(ERASER);
// }
// g2.drawLine(startPoint.x, startPoint.y, pt.x, pt.y);
// g2.dispose();
// startPoint.setLocation(pt);
// repaint();
// }
//
// @Override public void mousePressed(MouseEvent e) {
// startPoint.setLocation(e.getPoint());
// isPen = e.getButton() == MouseEvent.BUTTON1;
// }
//
// @Override public void mouseMoved(MouseEvent e) {
// /* not needed */
// }
//
// @Override public void mouseExited(MouseEvent e) {
// /* not needed */
// }
//
// @Override public void mouseEntered(MouseEvent e) {
// /* not needed */
// }
//
// @Override public void mouseReleased(MouseEvent e) {
// /* not needed */
// }
//
// @Override public void mouseClicked(MouseEvent e) {
// /* not needed */
// }
// }