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use ggez::event::{KeyCode, KeyMods, MouseButton};
use ggez::{event, graphics, Context, GameError, GameResult};
use glam::Vec2;
use log::{debug, info, trace, warn};
use crate::{
Chess, GameState, Square, Theme, ALL_SQUARES, BOARD_CELL_PX_SIZE, BOARD_PX_SIZE, BOARD_SIZE,
};
/// A wrapper of [`Chess`] for GUI.
#[derive(Default, Debug)]
pub struct ChessGui {
chess: Chess,
theme: Theme,
}
impl ChessGui {
/// Create a new instance of ChessGui.
pub fn new(chess: Chess, theme: Theme) -> Self {
ChessGui { chess, theme }
}
/// Set the theme for the GUI.
///
/// # Examples
///
/// ```
/// use chess::{ChessGui, THEME_SANDCASTLE};
///
/// let mut game = ChessGui::default();
/// game.set_theme(THEME_SANDCASTLE);
/// ```
pub fn set_theme(&mut self, theme: Theme) {
self.theme = theme;
}
/// Base function to call when a user click on the screen.
fn click(&mut self, x: f32, y: f32) {
if x < BOARD_PX_SIZE.0 as f32 {
self.click_on_board(x, y);
} else {
self.click_on_side(x, y);
}
}
/// React when the user click on the board screen.
///
/// It is the callers responsibility to ensure the coordinate is in the board.
fn click_on_board(&mut self, x: f32, y: f32) {
let current_square = Square::from_screen(x, y);
debug!("Click at: ({x},{y}) -> on the square: {current_square}");
match self.chess.square_focused {
Some(square_selected) => self.chess.play(square_selected, current_square),
None => {
if self
.chess
.board
.color_on_is(current_square, self.chess.board.side_to_move())
{
self.chess.square_focused = Some(current_square);
}
}
}
}
/// React when the user click on the side screen.
///
/// It is the callers responsibility to ensure the coordinate is in the side.
fn click_on_side(&self, x: f32, y: f32) {
// todo
info!("Click at: ({x},{y}) -> on the side screen")
}
/// Draw all of the board side.
fn draw_board(&self, ctx: &mut Context) -> GameResult {
self.draw_empty_board(ctx)?;
self.draw_legal_moves(ctx)?;
self.draw_pinned_piece(ctx)?;
self.draw_content_board(ctx)?;
Ok(())
}
/// Draw the empty chess board (without pieces).
fn draw_empty_board(&self, ctx: &mut Context) -> GameResult {
for y in 0..BOARD_SIZE.1 {
for x in 0..BOARD_SIZE.0 {
let color_index = if (x % 2 == 1 && y % 2 == 1) || (x % 2 == 0 && y % 2 == 0) {
0
} else {
1
};
let mesh = graphics::MeshBuilder::new()
.rectangle(
graphics::DrawMode::fill(),
graphics::Rect::new(
(x * BOARD_CELL_PX_SIZE.0) as f32,
(y * BOARD_CELL_PX_SIZE.1) as f32,
BOARD_CELL_PX_SIZE.0 as f32,
BOARD_CELL_PX_SIZE.1 as f32,
),
self.theme.board_color[color_index],
)?
.build(ctx)?;
graphics::draw(ctx, &mesh, graphics::DrawParam::default())?;
}
}
Ok(())
}
/// Draw pieces on the board.
fn draw_content_board(&self, ctx: &mut Context) -> GameResult {
let mut path;
let mut image;
for square in ALL_SQUARES {
if let Some((piece, color)) = self.chess.board.on(square) {
path = self.theme.piece_path[color.to_index()][piece.to_index()];
image = graphics::Image::new(ctx, path).expect("Image load error");
let (x, y) = square.to_screen();
let dest_point = Vec2::new(x, y);
let image_scale = Vec2::new(0.5, 0.5);
let dp = graphics::DrawParam::new()
.dest(dest_point)
.scale(image_scale);
graphics::draw(ctx, &image, dp)?;
}
}
Ok(())
}
/// Draw all the possible destination of the selected piece.
fn draw_legal_moves(&self, ctx: &mut Context) -> GameResult {
if self.theme.valid_moves_color.is_some() {
if let Some(square) = self.chess.square_focused {
for dest in self.chess.board.get_legal_moves(square) {
let (x, y) = dest.to_screen();
let mesh = graphics::MeshBuilder::new()
.rectangle(
graphics::DrawMode::fill(),
graphics::Rect::new(
x,
y,
BOARD_CELL_PX_SIZE.0 as f32,
BOARD_CELL_PX_SIZE.1 as f32,
),
self.theme.valid_moves_color.unwrap(),
)?
.build(ctx)?;
graphics::draw(ctx, &mesh, graphics::DrawParam::default())?;
}
}
}
Ok(())
}
/// Draw the [`Piece`] that are pinned (i.e. can't move).
fn draw_pinned_piece(&self, ctx: &mut Context) -> GameResult {
if self.theme.piece_pinned_path.is_some() {
let mut path;
let mut image;
for square in self.chess.board.pinned() {
path = self.theme.piece_pinned_path.unwrap();
image = graphics::Image::new(ctx, path).expect("Image load error");
let (x, y) = square.to_screen();
let dest_point = Vec2::new(x, y);
// We set the scale at 1.0 because we want the same size
// for the image and a Board_cell
const SCALE: f32 = 1.0;
let image_scale = Vec2::new(
SCALE * (BOARD_CELL_PX_SIZE.0 as u16 / image.width()) as f32,
SCALE * (BOARD_CELL_PX_SIZE.1 as u16 / image.height()) as f32,
);
let dp = graphics::DrawParam::new()
.dest(dest_point)
.scale(image_scale);
graphics::draw(ctx, &image, dp)?;
}
} else if self.theme.piece_pinned_color.is_some() {
for piece in self.chess.board.pinned() {
let (x, y) = piece.to_screen();
let mesh = graphics::MeshBuilder::new()
.rectangle(
graphics::DrawMode::fill(),
graphics::Rect::new(
x,
y,
BOARD_CELL_PX_SIZE.0 as f32,
BOARD_CELL_PX_SIZE.1 as f32,
),
self.theme.piece_pinned_color.unwrap(),
)?
.build(ctx)?;
graphics::draw(ctx, &mesh, graphics::DrawParam::default())?;
}
}
Ok(())
}
/// Draw all the side screen.
fn draw_side(&self, _ctx: &mut Context) -> GameResult {
// todo
Ok(())
}
/// Draw a window with winner, score?, stats?
fn draw_winner(&self, _ctx: &mut Context, game_state: GameState) -> GameResult {
warn!("NotImplementedYet: draw_winner()");
trace!("GameState: {:?}", game_state);
Ok(())
}
}
impl event::EventHandler<GameError> for ChessGui {
/// Update will happen on every frame before it is drawn.
fn update(&mut self, _ctx: &mut Context) -> GameResult {
Ok(())
}
/// Render the game's current state.
fn draw(&mut self, ctx: &mut Context) -> GameResult {
// First we clear the screen and set the background color
graphics::clear(ctx, self.theme.background_color);
// Draw according to the GameState
match self.chess.state() {
GameState::Ongoing => {
self.draw_board(ctx)?;
self.draw_side(ctx)?;
}
game_state => self.draw_winner(ctx, game_state)?,
}
// Finally we call graphics::present to cycle the gpu's framebuffer and display
// the new frame we just drew.
graphics::present(ctx)?;
// And return success.
Ok(())
}
/// Called every time a mouse button gets pressed
fn mouse_button_down_event(&mut self, _ctx: &mut Context, button: MouseButton, x: f32, y: f32) {
if button == MouseButton::Left {
self.click(x, y);
}
}
/// Called every time a key gets pressed
/// Inputs are managed here
fn key_down_event(
&mut self,
ctx: &mut Context,
keycode: KeyCode,
keymod: KeyMods,
_repeat: bool,
) {
match keycode {
// Z: Quit the game
KeyCode::Escape => event::quit(ctx),
// R: Reset the game (new chess game)
KeyCode::R => self.chess.reset(),
// CTRL+Z: Undo (i.e. go back one step in history)
KeyCode::Z if keymod == KeyMods::CTRL => self.chess.undo(),
_ => {}
};
}
}