Add a renderable field for liberties

kifu/kifu-core/src/ui/types.rs

@@ -14,12 +14,14 @@ pub struct Jitter {
 pub struct StoneElement {
     pub color: Color,
     pub jitter: Jitter,
+    pub liberties: Option<u8>,
 }
 
 impl StoneElement {
-    pub fn new(color: Color) -> Self {
+    pub fn new(color: Color, liberties: Option<u8>) -> Self {
         Self {
             color,
+            liberties,
             jitter: Jitter { x: 0, y: 0 },
         }
     }
@@ -74,6 +76,7 @@ impl From<&Board> for BoardElement {
                     .map(|column| match board.stone(Coordinate { column, row }) {
                         Some(color) => IntersectionElement::Filled(StoneElement {
                             jitter: Jitter { x: 0, y: 0 },
+                            liberties: None,
                             color,
                         }),
                         None => IntersectionElement::Empty(Request::PlayStoneRequest(

kifu/kifu-gtk/src/ui/board.rs

@@ -141,7 +141,7 @@ impl ObjectImpl for BoardPrivate {
                     (0..19).for_each(|row| {
                         match board.stone(row, col) {
                             IntersectionElement::Filled(stone) => {
-                                pen.stone(&context, row, col, stone.color);
+                                pen.stone(&context, row, col, stone.color, stone.liberties);
                             }
                             _ => {}
                         };
@@ -270,12 +270,27 @@ impl Pen {
         let _ = context.fill();
     }
 
-    fn stone(&self, context: &cairo::Context, row: u8, col: u8, color: Color) {
+    fn stone(
+        &self,
+        context: &cairo::Context,
+        row: u8,
+        col: u8,
+        color: Color,
+        liberties: Option<u8>,
+    ) {
         match color {
             Color::White => context.set_source_rgb(0.9, 0.9, 0.9),
             Color::Black => context.set_source_rgb(0.0, 0.0, 0.0),
         };
         self.draw_stone(context, row, col);
+
+        if let Some(liberties) = liberties {
+            let stone_location = self.stone_location(row, col);
+            context.set_source_rgb(1., 0., 1.);
+            context.set_font_size(32.);
+            context.move_to(stone_location.0 - 10., stone_location.1 + 10.);
+            let _ = context.show_text(&format!("{}", liberties));
+        }
     }
 
     fn ghost_stone(&self, context: &cairo::Context, row: u8, col: u8, color: Color) {
@@ -288,13 +303,15 @@ impl Pen {
 
     fn draw_stone(&self, context: &cairo::Context, row: u8, col: u8) {
         let radius = self.hspace_between / 2. - 2.;
-        context.arc(
+        let (x_loc, y_loc) = self.stone_location(row, col);
-            self.x_offset + (col as f64) * self.hspace_between,
+        context.arc(x_loc, y_loc, radius, 0.0, 2.0 * std::f64::consts::PI);
-            self.y_offset + (row as f64) * self.vspace_between,
-            radius,
-            0.0,
-            2.0 * std::f64::consts::PI,
-        );
         let _ = context.fill();
     }
+
+    fn stone_location(&self, row: u8, col: u8) -> (f64, f64) {
+        (
+            self.x_offset + (col as f64) * self.hspace_between,
+            self.y_offset + (row as f64) * self.vspace_between,
+        )
+    }
 }