monorepo/otg/gtk/src/components/goban.rs

/*
Copyright 2024, Savanni D'Gerinel <savanni@luminescent-dreams.com>

This file is part of On the Grid.

On the Grid is free software: you can redistribute it and/or modify it under the terms of
the GNU General Public License as published by the Free Software Foundation, either version 3 of
the License, or (at your option) any later version.

On the Grid is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with On the Grid. If not, see <https://www.gnu.org/licenses/>.
*/

// I have an old Board class which I'm going to update. I'll just copy over the rendering code, but
// at the same time I am going to work pretty heavily on the API.
//
// For a game review, the board needs to interact very well with a game record. So I have to keep
// in mind all of that as I work on the API.
//
// Also, this is going to be a cross-platform application. Today it is Gnome + Rust, but as I
// progress I will also need a Progressive Web App so that I can run this on my tablet. Especially
// useful if I'm out socializing and happen to be talking to somebody who would enjoy a relaxing
// game. Anyway, that is going to impact some of my API decisions.
//
// First, though, I need to rename my game record.
//
// Now, let's get the existing code compiling again.
//
// Okay, that wasn't so bad. I'm a little confused that I don't have a code action for renaming a
// symbol, but I'll fix that some other time. Anyway, now let's focus on the goban.

// Now, we know what kind of object we have for the current board representation. Let's make use of
// that.

use crate::perftrace;
use gio::resources_lookup_data;
use glib::Object;
use gtk::{
    gdk_pixbuf::{InterpType, Pixbuf},
    prelude::*,
    subclass::prelude::*,
};
use image::io::Reader as ImageReader;
use std::{cell::RefCell, io::Cursor, rc::Rc};

const WIDTH: i32 = 800;
const HEIGHT: i32 = 800;
const MARGIN: i32 = 20;

// Internal representation of the Goban drawing area.
#[derive(Default)]
pub struct GobanPrivate {
    board_state: Rc<RefCell<otg_core::Goban>>,
}

impl GobanPrivate {}

#[glib::object_subclass]
impl ObjectSubclass for GobanPrivate {
    const NAME: &'static str = "Goban";
    type Type = Goban;
    type ParentType = gtk::DrawingArea;
}

impl ObjectImpl for GobanPrivate {}
impl WidgetImpl for GobanPrivate {}
impl DrawingAreaImpl for GobanPrivate {}

// This Goban, being in the `components` crate, is merely the rendering of a board. This is not
// the primary representation of the board.
//
// In a game of Go, there are certain rules about what are valid moves and what are not.
// Internally, I want to keep track of those, and doing so requires a few things.
//
// - We can never repeat a game state (though I think maybe that is allowed in a few rulesets, but
// I'm coding to the AGA ruleset)
// - We can never play a suicidal move
//
// Finally, updating the board state is non-GUI logic. So, sorry, might be dropping away from GUI
// code for a while to work on the backend representation, some of which already exists.
glib::wrapper! {
    pub struct Goban(ObjectSubclass<GobanPrivate>) @extends gtk::DrawingArea, gtk::Widget;
}

impl Goban {
    pub fn new(board_state: otg_core::Goban) -> Self {
        let s: Self = Object::builder().build();

        *s.imp().board_state.borrow_mut() = board_state;
        s.set_width_request(WIDTH);
        s.set_height_request(HEIGHT);

        s.set_draw_func({
            let s = s.clone();
            move |_, ctx, width, height| {
                perftrace("render drawing area", || s.redraw(ctx, width, height));
            }
        });

        s
    }

    fn redraw(&self, ctx: &cairo::Context, width: i32, height: i32) {
        println!("{} x {}", width, height);
        /*
        let wood_texture = resources_lookup_data(
            "/com/luminescent-dreams/otg-gtk/wood_texture.jpg",
            gio::ResourceLookupFlags::NONE,
        )
        .unwrap();

        let background = ImageReader::new(Cursor::new(wood_texture))
            .with_guessed_format()
            .unwrap()
            .decode();
        let background = background.map(|background| {
            Pixbuf::from_bytes(
                &glib::Bytes::from(background.as_bytes()),
                gtk::gdk_pixbuf::Colorspace::Rgb,
                false,
                8,
                background.width() as i32,
                background.height() as i32,
                background.to_rgb8().sample_layout().height_stride as i32,
            )
            .scale_simple(WIDTH, HEIGHT, InterpType::Nearest)
        });

        match background {
            Ok(Some(ref background)) => {
                ctx.set_source_pixbuf(background, 0., 0.);
                ctx.paint().expect("paint should never fail");
            }
            Ok(None) | Err(_) => ctx.set_source_rgb(0.7, 0.7, 0.7),
        }
        */

        ctx.set_source_rgb(0.7, 0.7, 0.7);
        let _ = ctx.paint();
    }
}