Chess: Optionaly display coordinates at edge of board

Author: https://github.com/petelliott
Commit: https://github.com/SerenityOS/serenity/commit/b0ffd4e9460
Pull-request: https://github.com/SerenityOS/serenity/pull/3255
Reviewed-by: https://github.com/awesomekling

Games/Chess/ChessWidget.cpp

@@ -29,6 +29,7 @@
 #include <AK/String.h>
 #include <LibGUI/MessageBox.h>
 #include <LibGUI/Painter.h>
+#include <LibGfx/Font.h>
 
 ChessWidget::ChessWidget(const StringView& set)
 {
@@ -53,6 +54,7 @@ void ChessWidget::paint_event(GUI::PaintEvent& event)
 
     size_t tile_width = width() / 8;
     size_t tile_height = height() / 8;
+    unsigned coord_rank_file = (side() == Chess::Colour::White) ? 0 : 7;
 
     Chess::Square::for_each([&](Chess::Square sq) {
         Gfx::IntRect tile_rect;
@@ -68,6 +70,19 @@ void ChessWidget::paint_event(GUI::PaintEvent& event)
             painter.fill_rect(tile_rect, m_move_highlight_color);
         }
 
+        if (m_coordinates) {
+            auto coord = sq.to_algebraic();
+            auto text_color = (sq.is_light()) ? board_theme().dark_square_color : board_theme().light_square_color;
+
+            auto shrunken_rect = tile_rect;
+            shrunken_rect.shrink(4, 4);
+            if (sq.rank == coord_rank_file)
+                painter.draw_text(shrunken_rect, coord.substring_view(0, 1), Gfx::Font::default_bold_font(), Gfx::TextAlignment::BottomRight, text_color);
+
+            if (sq.file == coord_rank_file)
+                painter.draw_text(shrunken_rect, coord.substring_view(1, 1), Gfx::Font::default_bold_font(), Gfx::TextAlignment::TopLeft, text_color);
+        }
+
         if (!(m_dragging_piece && sq == m_moving_square)) {
             auto bmp = m_pieces.get(board().get_piece(sq));
             if (bmp.has_value()) {

Games/Chess/ChessWidget.h

@@ -78,6 +78,9 @@ public:
 
     void maybe_input_engine_move();
 
+    void set_coordinates(bool coordinates) { m_coordinates = coordinates; }
+    bool coordinates() const { return m_coordinates; }
+
 private:
     Chess::Board m_board;
     BoardTheme m_board_theme { "Beige", Color::from_rgb(0xb58863), Color::from_rgb(0xf0d9b5) };
@@ -90,4 +93,5 @@ private:
     bool m_dragging_piece { false };
     bool m_drag_enabled { true };
     RefPtr<Engine> m_engine;
+    bool m_coordinates { true };
 };

Games/Chess/main.cpp

@@ -53,6 +53,7 @@ int main(int argc, char** argv)
 
     widget.set_piece_set(config->read_entry("Style", "PieceSet", "test"));
     widget.set_board_theme(config->read_entry("Style", "BoardTheme", "Beige"));
+    widget.set_coordinates(config->read_bool_entry("Style", "Coordinates", true));
 
     auto menubar = GUI::MenuBar::construct();
     auto& app_menu = menubar->add_menu("Chess");
@@ -105,6 +106,15 @@ int main(int argc, char** argv)
         board_theme_menu.add_action(*action);
     }
 
+    auto coordinates_action = GUI::Action::create_checkable("Coordinates", [&](auto& action) {
+        widget.set_coordinates(action.is_checked());
+        widget.update();
+        config->write_bool_entry("Style", "Coordinates", action.is_checked());
+        config->sync();
+    });
+    coordinates_action->set_checked(widget.coordinates());
+    style_menu.add_action(coordinates_action);
+
     auto& engine_menu = menubar->add_menu("Engine");
 
     GUI::ActionGroup engines_action_group;