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| package composites;
import javax.imageio.ImageIO;
import javax.swing.*;
import java.awt.*;
import java.awt.event.ComponentAdapter;
import java.awt.event.ComponentEvent;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.geom.Arc2D;
import java.awt.geom.Ellipse2D;
import java.awt.image.BufferedImage;
import java.awt.image.ConvolveOp;
import java.awt.image.Kernel;
import java.io.File;
import java.util.Optional;
import java.util.logging.Level;
import java.util.logging.Logger;
public final class Main extends JPanel {
private static final Paint FOG = new Color(0, 0, 10, 150);
private static final Color TRANSPARENT = new Color(0, 0, 0, 0);
private static final ConvolveOp BOX_BLUR_5 = createBoxBlurOp(5);
private static final ConvolveOp BOX_BLUR_20 = createBoxBlurOp(20);
private final Shape player;
private final Shape fow;
private final Paint fowFill;
private Shape playground;
private final Paint backgroundFill;
private BufferedImage defaultBackground;
private BufferedImage visibleBackground;
private BufferedImage visibleMask;
private BufferedImage fogOgWarMask;
private BufferedImage fogOfWar;
private float fowAngle = 0;
private Main() {
player = new Ellipse2D.Float(-5, -5, 10, 10);
fow = new Arc2D.Float(-200, -200, 400, 400, -45, 90, Arc2D.PIE);
fowFill = new RadialGradientPaint(0, 0, 100, new float[]{0.5f, 0.95f}, new Color[]{Color.WHITE, TRANSPARENT}, MultipleGradientPaint.CycleMethod.NO_CYCLE);
backgroundFill = createBackgroundTexture();
addComponentListener(new ComponentAdapter() {
@Override
public void componentResized(ComponentEvent event) {
final var insets = getInsets();
final int width = Math.max(0, getWidth() - (insets.left + insets.right));
final int height = Math.max(0, getHeight() - (insets.top + insets.bottom));
playground = new Rectangle(0, 0, width, height);
// Clear to make sure layers are re-created
visibleMask = null;
fogOgWarMask = null;
defaultBackground = null;
visibleBackground = null;
fogOfWar = null;
repaint();
}
});
setFocusable(true);
requestFocus();
addKeyListener(new KeyAdapter() {
@Override
public void keyReleased(KeyEvent event) {
switch (event.getKeyCode()) {
case KeyEvent.VK_SPACE: {
exportLayers();
}
break;
default:
}
event.consume();
}
@Override
public void keyPressed(KeyEvent event) {
switch (event.getKeyCode()) {
case KeyEvent.VK_LEFT: {
fowAngle--;
}
break;
case KeyEvent.VK_RIGHT: {
fowAngle++;
}
break;
default:
}
repaint();
event.consume();
}
});
}
public static void main(String... args) {
SwingUtilities.invokeLater(() -> launch(args));
}
private static void launch(String... args) {
final var frame = new JFrame();
frame.setContentPane(new Main());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(new Dimension(500, 500));
frame.setVisible(true);
}
private static Paint createBackgroundTexture() {
final var image = createAcceleratedImage(100, 100, Transparency.TRANSLUCENT);
final var g2d = setupGraphics(image.createGraphics());
try {
g2d.setPaint(Color.WHITE);
g2d.fillRect(0, 0, 100, 100);
g2d.setPaint(Color.BLUE);
g2d.fillRect(25, 25, 50, 50);
} finally {
g2d.dispose();
}
return new TexturePaint(image, new Rectangle(100, 100));
}
private static BufferedImage createAcceleratedImage(final int width, final int height, final int transparency) {
final var ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
final var gc = ge.getDefaultScreenDevice().getDefaultConfiguration();
return gc.createCompatibleImage(width, height, transparency);
}
private static BufferedImage toAccceleratedimage(final BufferedImage source) {
final var destination = createAcceleratedImage(source.getWidth(), source.getHeight(), source.getTransparency());
final var g2d = setupGraphics(destination.createGraphics());
try {
g2d.drawImage(source, 0, 0, null);
} finally {
g2d.dispose();
}
return destination;
}
private static Graphics2D setupGraphics(final Graphics2D g2d) {
g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
return g2d;
}
private static BufferedImage clearImage(final BufferedImage image) {
final var g2d = setupGraphics(image.createGraphics());
try {
g2d.setComposite(AlphaComposite.Clear);
g2d.setPaint(Color.BLACK);
g2d.fillRect(0, 0, image.getWidth(), image.getHeight());
} finally {
g2d.dispose();
}
return image;
}
private static void exportImage(final BufferedImage image, final String name) {
try {
ImageIO.write(image, "png", new File(name));
} catch (Exception ex) {
Logger.getGlobal().log(Level.SEVERE, ex.getMessage(), ex);
}
}
private static ConvolveOp createBoxBlurOp(final int radius) {
final int size = radius * 2 + 1;
final float weight = 1.0f / (size * size);
final float[] data = new float[size * size];
for (int i = 0; i < data.length; i++) {
data[i] = weight;
}
final var kernel = new Kernel(size, size, data);
return new ConvolveOp(kernel);
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
final var insets = getInsets();
final int width = Math.max(0, getWidth() - (insets.left + insets.right));
final int height = Math.max(0, getHeight() - (insets.top + insets.bottom));
if (width == 0 || height == 0 || playground == null) {
return;
}
final double centerX = width / 2d;
final double centerY = height / 2d;
final var g2d = setupGraphics((Graphics2D) g.create(insets.left, insets.top, width, height));
try {
visibleMask = renderVisibleFowMask(visibleMask, width, height);
fogOgWarMask = renderFogOfWarMask(fogOgWarMask, width, height);
defaultBackground = renderDefaultBackground(defaultBackground, width, height);
visibleBackground = renderVisibleBackground(visibleBackground, width, height);
fogOfWar = renderFogOfWar(fogOfWar, width, height);
g2d.drawImage(defaultBackground, 0, 0, null);
g2d.drawImage(visibleBackground, 0, 0, null);
g2d.translate(centerX, centerY);
g2d.setPaint(Color.RED);
g2d.fill(player);
g2d.translate(-centerX, -centerY);
g2d.drawImage(fogOfWar, 0, 0, null);
} finally {
g2d.dispose();
}
}
private BufferedImage renderDefaultBackground(BufferedImage image, final int width, int height) {
// This background is static, no need to re-render every time.
if (image == null || image.getWidth() != width || image.getHeight() != height) {
image = createAcceleratedImage(width, height, Transparency.OPAQUE);
final var g2d = setupGraphics(image.createGraphics());
try {
g2d.setPaint(backgroundFill);
g2d.fill(playground);
} finally {
g2d.dispose();
}
image = BOX_BLUR_20.filter(image, null);
image = toAccceleratedimage(image);
}
return image;
}
private BufferedImage renderVisibleBackground(BufferedImage image, final int width, int height) {
if (image == null) {
image = createAcceleratedImage(width, height, Transparency.TRANSLUCENT);
} else {
image = clearImage(image);
}
final var g2d = setupGraphics(image.createGraphics());
try {
g2d.drawImage(visibleMask, 0, 0, null);
g2d.setComposite(AlphaComposite.SrcIn);
g2d.setPaint(backgroundFill);
g2d.fill(playground);
} finally {
g2d.dispose();
}
return image;
}
private BufferedImage renderVisibleFowMask(BufferedImage image, final int width, int height) {
if (image == null) {
image = createAcceleratedImage(width, height, Transparency.TRANSLUCENT);
} else {
image = clearImage(image);
}
final double centerX = width / 2d;
final double centerY = height / 2d;
final var g2d = setupGraphics(image.createGraphics());
try {
g2d.translate(centerX, centerY);
g2d.rotate(2 * Math.PI * fowAngle / 360d);
g2d.setPaint(fowFill);
g2d.fill(fow);
} finally {
g2d.dispose();
}
image = BOX_BLUR_5.filter(image, null);
image = toAccceleratedimage(image);
return image;
}
private BufferedImage renderFogOfWarMask(BufferedImage image, final int width, int height) {
if (image == null) {
image = createAcceleratedImage(width, height, Transparency.TRANSLUCENT);
} else {
image = clearImage(image);
}
final var g2d = setupGraphics(image.createGraphics());
try {
g2d.drawImage(visibleMask, 0, 0, null);
} finally {
g2d.dispose();
}
for (int y = 0; y < image.getHeight(); y++) {
for (int x = 0; x < image.getWidth(); x++) {
final int source = image.getRGB(x, y);
final int alpha = (source >> 24) & 0xFF;
final int red = (source >> 16) & 0xFF;
final int green = (source >> 8) & 0xFF;
final int blue = (source >> 0) & 0xFF;
final int destination = (255 - alpha) << 24 | (red << 16) | (green << 8) | (blue << 0);
image.setRGB(x, y, destination);
}
}
return image;
}
private BufferedImage renderFogOfWar(BufferedImage image, final int width, int height) {
if (image == null) {
image = createAcceleratedImage(width, height, Transparency.TRANSLUCENT);
} else {
image = clearImage(image);
}
final var g2d = setupGraphics(image.createGraphics());
try {
g2d.drawImage(fogOgWarMask, 0, 0, null);
g2d.setComposite(AlphaComposite.SrcIn);
g2d.setPaint(FOG);
g2d.fill(playground);
} finally {
g2d.dispose();
}
return image;
}
private void exportLayers() {
Optional.ofNullable(visibleMask)
.ifPresent(image -> exportImage(image, "fow-mask-visible.png"));
Optional.ofNullable(fogOgWarMask)
.ifPresent(image -> exportImage(image, "fow-mask-fog-of-war.png"));
Optional.ofNullable(defaultBackground)
.ifPresent(image -> exportImage(image, "layer-background-default.png"));
Optional.ofNullable(visibleBackground)
.ifPresent(image -> exportImage(image, "layer-background-visible.png"));
Optional.ofNullable(fogOfWar)
.ifPresent(image -> exportImage(image, "layer-fog-of-war.png"));
// Test: make sure clearImage really clears content.
Optional.ofNullable(defaultBackground)
.ifPresent(image -> {
var image2 = createAcceleratedImage(image.getWidth(), image.getHeight(), Transparency.TRANSLUCENT);
final var g2d = setupGraphics(image.createGraphics());
try {
g2d.setPaint(Color.RED);
g2d.fillRect(0, 0, image.getWidth(), image.getHeight());
} finally {
g2d.dispose();
}
image2 = clearImage(image2);
exportImage(image2, "test-clear.png");
});
}
} |
