X & Y coord to codePointAt(tile)

[akurutin]

How to convert mouse coordinates on the мpanel to tile coordinates? I'm intercepting mouse movement events and want to highlight the tiles the mouse is moving over.

[Valkryst]

You should be able to use the getWidthInTiles() and getHeightInTiles() methods to convert mouse coordinates to tile coordinates using a calculation similar to the following:

panel.addMouseListener(new MouseAdapter() {
    @Override
    public void mousePressed(final MouseEvent e) {
        super.mouseMoved(e);
        System.out.println("Mouse Pressed");
        System.out.println("\t(x, y): " + e.getX() + ", " + e.getY());

        final int tileX = e.getX() / (panel.getWidth() / panel.getWidthInTiles());
        final int tileY = e.getY() / (panel.getHeight() / panel.getHeightInTiles());
        System.out.println("\t(tiltX, tileY): " + tileX + ", " + tileY);
    }
});

Demo

Preview

Code

public class Driver {
    public static void main(final String[] args) {
        try {
            UIManager.setLookAndFeel(VTerminalLookAndFeel.getInstance(24));
        } catch (final UnsupportedLookAndFeelException e) {
            e.printStackTrace();
        }

        SwingUtilities.invokeLater(() -> {
            final var frame = new VFrame(40, 20);
            frame.setVisible(true);
            frame.pack();
            frame.setLocationRelativeTo(null);

            final var panel = frame.getContentPane();
            panel.setBackground(Color.MAGENTA);

            for (int y = 0 ; y < panel.getHeightInTiles() ; y++) {
                for (int x = 0 ; x < panel.getWidthInTiles() ; x++) {
                    panel.setCodePointAt(x, y, getRandomCodePoint());
                }
            }

            panel.addMouseListener(new MouseAdapter() {
                @Override
                public void mousePressed(final MouseEvent e) {
                    super.mouseMoved(e);
                    System.out.println("Mouse Pressed");
                    System.out.println("\t(x, y): " + e.getX() + ", " + e.getY());

                    final int tileX = e.getX() / (panel.getWidth() / panel.getWidthInTiles());
                    final int tileY = e.getY() / (panel.getHeight() / panel.getHeightInTiles());
                    System.out.println("\t(tiltX, tileY): " + tileX + ", " + tileY);

                    panel.setBackgroundAt(tileX, tileY, Color.GREEN);
                    panel.setForegroundAt(tileX, tileY, Color.BLACK);
                    panel.repaint();
                }
            });
        });
    }

    private static int getRandomCodePoint() {
        return ThreadLocalRandom.current().nextInt(33, 126);
    }
}

[akurutin]

Thank you very much for such a detailed answer and for your library ;) I'm making a small game for my wife for the New Year, and vterminal is really helping me with it ;)

[Valkryst]

Anytime, I'm just happy to see it coming in-handy. If you're open to it, I'd like to check out your project's code when it's done. It might give me a few ideas for improvements, depending on how the library's used.