Stage.java

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package com.jscratch;
 
import java.awt.AlphaComposite;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import java.awt.image.BufferedImage;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.CopyOnWriteArrayList;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JToolBar;
import javax.swing.JButton;
import javax.swing.SwingUtilities;
import javax.swing.Timer;
import java.awt.BorderLayout;
 
public class Stage extends JPanel implements KeyListener, MouseListener, MouseMotionListener {
    public static Stage instance;
    private JFrame frame;
    private Timer renderTimer;
 
    // Direct translations for Scratch concepts
    private List<Sprite> sprites = new CopyOnWriteArrayList<>();
    private List<Costume> backdrops = new ArrayList<>();
    private int backdropIndex = 0;
    
    // Stage properties
    private String currentBackdropName = "";
    private double tempo = 60;
    private double timerValue = 0;
    private long startTime;
 
    // Input state
    private int mouseX = 0;
    private int mouseY = 0;
    private boolean mouseDown = false;
    private final boolean[] keysDown = new boolean[65536];
    
    // Frame Sync
    private java.util.concurrent.CountDownLatch frameLatch = new java.util.concurrent.CountDownLatch(1);
    
    // Event Listeners
    private java.util.Map<String, List<Runnable>> broadcastListeners = new java.util.concurrent.ConcurrentHashMap<>();
    private java.util.Map<Integer, List<Runnable>> keyListeners = new java.util.concurrent.ConcurrentHashMap<>();
    private List<java.util.function.BiConsumer<Double, Double>> scaleListeners = new java.util.concurrent.CopyOnWriteArrayList<>();
    
    // Backing ScratchObject for global vars/lists/sounds
    private final ScratchObject stageObject;
    private double currentScale = 1.0;
 
    public Stage() {
        this.stageObject = new ScratchObject("Stage") {};
        
        this.setPreferredSize(new Dimension(480, 360));
        this.setBackground(Color.WHITE);
        this.setFocusable(true);
        this.addKeyListener(this);
        this.addMouseListener(this);
        this.addMouseMotionListener(this);
        
        renderTimer = new Timer(1000 / 60, e -> {
            update();
            repaint();
            java.util.concurrent.CountDownLatch oldLatch = frameLatch;
            frameLatch = new java.util.concurrent.CountDownLatch(1);
            oldLatch.countDown();
        });
        renderTimer.start();
        
        startTime = System.currentTimeMillis();
    }
    
    // --- Delegate ScratchObject Methods ---
    public Object getVariable(String name) { return stageObject.getVariable(name); }
    public double getVariableAsNumber(String name) { return stageObject.getVariableAsNumber(name); }
    public String getVariableAsString(String name) { return stageObject.getVariableAsString(name); }
    public String answer() { return stageObject.answer(); }
    public void setVariable(String name, Object value) { stageObject.setVariable(name, value); }
    public void changeVariableBy(String name, double amount) { stageObject.changeVariableBy(name, amount); }
    public void addToList(String listName, Object item) { stageObject.addToList(listName, item); }
    public String join(Object a, Object b) { return stageObject.join(a, b); }
    public void setVolume(double vol) { stageObject.setVolume(vol); }
    public void playSound(String path) { stageObject.playSound(path); }
    public void startScript(Runnable script) { stageObject.startScript(script); }
 
    // --- Broadcasts & Keys ---
    public void broadcast(String message) {
        List<Runnable> listeners = broadcastListeners.get(message);
        if (listeners != null) {
            for (Runnable r : listeners) {
                stageObject.startScript(r);
            }
        }
    }
 
    public void whenIReceive(String message, Runnable action) {
        broadcastListeners.computeIfAbsent(message, k -> new CopyOnWriteArrayList<>()).add(action);
    }
    
    public void whenKeyPressed(int keyCode, Runnable action) {
        keyListeners.computeIfAbsent(keyCode, k -> new java.util.concurrent.CopyOnWriteArrayList<>()).add(action);
    }
 
    public void whenScaleChanged(java.util.function.BiConsumer<Double, Double> action) {
        scaleListeners.add(action);
    }
 
    public boolean isKeyPressed(String keyName) {
        switch(keyName.toLowerCase()) {
            case "space": return isKeyPressed(KeyEvent.VK_SPACE);
            case "up arrow": return isKeyPressed(KeyEvent.VK_UP);
            case "down arrow": return isKeyPressed(KeyEvent.VK_DOWN);
            case "right arrow": return isKeyPressed(KeyEvent.VK_RIGHT);
            case "left arrow": return isKeyPressed(KeyEvent.VK_LEFT);
            case "any": 
                for(boolean b : keysDown) if(b) return true;
                return false;
            default:
                if(keyName.length() == 1) {
                    char c = keyName.toUpperCase().charAt(0);
                    return isKeyPressed((int)c);
                }
                return false;
        }
    }
    
    public void waitNextFrame() {
        try { frameLatch.await(); } catch (InterruptedException e) { Thread.currentThread().interrupt(); }
    }
    
    public void waitTillNextFrame() {
        waitNextFrame();
    }
    
    // --- Setup ---
    public void addSprite(Sprite s) {
        sprites.add(s);
        s.setStage(this);
    }
    
    public void goToFront(Sprite s) {
        if (sprites.remove(s)) {
            sprites.add(s);
        }
    }
 
    public void goToBack(Sprite s) {
        if (sprites.remove(s)) {
            sprites.add(0, s);
        }
    }
    
    public void addBackdrop(Costume c) {
        backdrops.add(c);
        if (backdrops.size() == 1) {
            switchBackdropTo(c.getName());
        }
    }
    
    public Costume getBackdrop() {
        if (!backdrops.isEmpty() && backdropIndex < backdrops.size()) {
            return backdrops.get(backdropIndex);
        }
        return null;
    }
 
    private void update() {
        timerValue = (System.currentTimeMillis() - startTime) / 1000.0;
    }
 
    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        Graphics2D g2d = (Graphics2D) g;
        g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
 
        if (!backdrops.isEmpty() && backdropIndex < backdrops.size()) {
            BufferedImage bg = backdrops.get(backdropIndex).getImage();
            g2d.drawImage(bg, 0, 0, getWidth(), getHeight(), null);
        }
 
        for (Sprite s : sprites) {
            if (s.isVisible()) {
                s.draw(g2d);
            }
        }
        
        // Watchers
        g2d.setColor(new Color(200, 200, 200, 200));
        int varY = 20;
        for (java.util.Map.Entry<String, Object> entry : stageObject.variables.entrySet()) {
            String text = entry.getKey() + ": " + entry.getValue();
            g2d.fillRoundRect(10, varY - 15, 120, 20, 5, 5);
            g2d.setColor(Color.BLACK);
            g2d.drawString(text, 15, varY);
            g2d.setColor(new Color(200, 200, 200, 200));
            varY += 25;
        }
    }
 
    public void switchBackdropTo(String name) {
        for (int i = 0; i < backdrops.size(); i++) {
            if (backdrops.get(i).getName().equals(name)) {
                backdropIndex = i;
                currentBackdropName = name;
                break;
            }
        }
        repaint();
    }
    
    public void nextBackdrop() {
        backdropIndex = (backdropIndex + 1) % backdrops.size();
        currentBackdropName = backdrops.get(backdropIndex).getName();
        repaint();
    }
 
    public int getMouseX() { return mouseX - getWidth() / 2; }
    public int getMouseY() { return -(mouseY - getHeight() / 2); }
    public int getStageWidth() { return getWidth(); }
    public int getStageHeight() { return getHeight(); }
    public double getScaleFactor() { return getWidth() / 480.0; }
    public boolean isMouseDown() { return mouseDown; }
    public boolean isKeyPressed(int keyCode) {
        return (keyCode >= 0 && keyCode < keysDown.length) ? keysDown[keyCode] : false;
    }
    public double getTimer() { return timerValue; }
    public void resetTimer() { startTime = System.currentTimeMillis(); }
 
    public void setStageScale(int scale, JFrame frame) {
        if (currentScale == scale) return;
        double oldScale = currentScale;
        currentScale = (double)scale;
        this.setPreferredSize(new Dimension(480 * scale, 360 * scale));
        SwingUtilities.invokeLater(() -> {
            if (frame != null) {
                frame.pack();
            }
            this.requestFocusInWindow();
        });
        for (java.util.function.BiConsumer<Double, Double> listener : scaleListeners) {
            listener.accept(oldScale, currentScale);
        }
        for (Sprite s : sprites) {
            s.handleScaleChange(oldScale, currentScale);
        }
    }
 
    @Override public void keyTyped(KeyEvent e) {}
    @Override public void keyPressed(KeyEvent e) {
        int code = e.getKeyCode();
        if (code < keysDown.length) keysDown[code] = true;
        List<Runnable> listeners = keyListeners.get(code);
        if (listeners != null) for (Runnable r : listeners) stageObject.startScript(r);
    }
    @Override public void keyReleased(KeyEvent e) { if (e.getKeyCode() < keysDown.length) keysDown[e.getKeyCode()] = false; }
    @Override public void mouseClicked(MouseEvent e) {
        for (int i = sprites.size() - 1; i >= 0; i--) {
            Sprite s = sprites.get(i);
            if (s.containsPoint(e.getX(), e.getY())) {
                s.handleMouseClick(e.getX(), e.getY());
                break;
            }
        }
    }
    @Override public void mousePressed(MouseEvent e) { mouseDown = true; }
    @Override public void mouseReleased(MouseEvent e) { mouseDown = false; }
    @Override public void mouseEntered(MouseEvent e) {}
    @Override public void mouseExited(MouseEvent e) {}
    @Override public void mouseDragged(MouseEvent e) { mouseX = e.getX(); mouseY = e.getY(); }
    @Override public void mouseMoved(MouseEvent e) { mouseX = e.getX(); mouseY = e.getY(); }
 
    public static void run(Runnable setup) {
        run(new Stage(), setup);
    }
 
    public static void run(Stage stage, Runnable setup) {
        instance = stage;
        SwingUtilities.invokeLater(() -> {
            JFrame frame = new JFrame("JScratch Stage");
            stage.frame = frame;
            frame.setLayout(new BorderLayout());
            
            JToolBar toolBar = new JToolBar();
            toolBar.setFloatable(false);
            
            JButton btn1x = new JButton("480x360");
            btn1x.addActionListener(e -> stage.setStageScale(1, frame));
            toolBar.add(btn1x);
            
            JButton btn2x = new JButton("960x720");
            btn2x.addActionListener(e -> stage.setStageScale(2, frame));
            toolBar.add(btn2x);
 
            JButton btn3x = new JButton("1440x1080");
            btn3x.addActionListener(e -> stage.setStageScale(3, frame));
            toolBar.add(btn3x);
            
            frame.add(toolBar, BorderLayout.NORTH);
            frame.add(stage, BorderLayout.CENTER);
            
            frame.pack();
            frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
            frame.setVisible(true);
            stage.requestFocusInWindow();
            setup.run();
        });
    }
 
    public void clearSprites() {
        sprites.clear();
        broadcastListeners.clear();
        keyListeners.clear();
        stageObject.activeScripts.clear();
        stageObject.variables.clear();
        stageObject.lists.clear();
    }
 
    public void disposeStage() {
        if (renderTimer != null) renderTimer.stop();
        if (frame != null) {
            frame.setVisible(false);
            frame.dispose();
        }
        if (instance == this) instance = null;
    }
 
    public static Stage getInstance() {
        if (instance == null) {
            instance = new Stage();
        }
        return instance;
    }
}