Sudoku through the end of chapter 8

piston-tutorials/sudoku/src/gameboard.rs

@@ -8,17 +8,20 @@ const SIZE: usize = 9;
 pub struct Cell {
     pub value: u8,
     pub loaded: bool,
+    pub invalid: bool,
 }
 
 #[derive(Debug, PartialEq)]
 pub struct Gameboard {
     pub cells: [[Cell; SIZE]; SIZE],
+    pub completed: bool,
 }
 
 impl Gameboard {
     pub fn new() -> Gameboard {
         Gameboard {
             cells: [[Cell::default(); SIZE]; SIZE],
+            completed: false,
         }
     }
 
@@ -29,6 +32,7 @@ impl Gameboard {
                 ret.cells[i][j] = Cell {
                     value: col,
                     loaded: col != 0,
+                    invalid: false,
                 };
             }
         }
@@ -52,8 +56,15 @@ impl Gameboard {
 
     pub fn set(&mut self, ind: [usize; 2], val: u8) {
         if !self.cells[ind[1]][ind[0]].loaded {
+            self.validate(ind, val);
             self.cells[ind[1]][ind[0]].value = val;
         }
+
+        self.completed = self
+            .cells
+            .iter()
+            .flatten()
+            .all(|cell| !cell.invalid && cell.value != 0);
     }
 
     pub fn load_sdm(filename: &str) -> Self {
@@ -71,12 +82,53 @@ impl Gameboard {
                 cells[row][col] = Cell {
                     value,
                     loaded: value != 0,
+                    invalid: false,
                 };
                 col += 1;
             }
         }
 
-        Self { cells }
+        Self {
+            cells,
+            completed: false,
+        }
+    }
+
+    fn validate(&mut self, ind: [usize; 2], val: u8) {
+        let [b, a] = ind;
+        for i in 0..SIZE {
+            if i == a {
+                continue;
+            }
+            if self.cells[a][i].value == val {
+                self.cells[a][b].invalid = true;
+                return;
+            }
+        }
+
+        for i in 0..SIZE {
+            if i == b {
+                continue;
+            }
+            if self.cells[i][b].value == val {
+                self.cells[a][b].invalid = true;
+                return;
+            }
+        }
+
+        let (row, col) = (a / 3, b / 3);
+        for i in 3 * row..3 * row + 3 {
+            for j in 3 * col..3 * col + 3 {
+                if i == a && j == b {
+                    continue;
+                }
+                if self.cells[i][j].value == val {
+                    self.cells[a][b].invalid = true;
+                    return;
+                }
+            }
+        }
+        self.cells[a][b].invalid = false;
     }
 }
 

piston-tutorials/sudoku/src/gameboard_view.rs

@@ -20,6 +20,9 @@ pub struct GameboardViewSettings {
     pub selected_cell_background_color: Color,
     pub text_color: Color,
     pub loaded_cell_background_color: Color,
+    pub invalid_cell_background_color: Color,
+    pub invalid_selected_cell_background_color: Color,
+    pub completed_background_color: Color,
 }
 
 impl GameboardViewSettings {
@@ -38,6 +41,9 @@ impl GameboardViewSettings {
             selected_cell_background_color: [0.9, 0.9, 1.0, 1.0],
             text_color: [0.0, 0.0, 0.1, 1.0],
             loaded_cell_background_color: [1.0, 1.0, 1.0, 1.0],
+            invalid_cell_background_color: [1.0, 0.0, 0.0, 1.0],
+            invalid_selected_cell_background_color: [1.0, 0.0, 0.5, 1.0],
+            completed_background_color: [0.0, 1.0, 0.0, 1.0],
         }
     }
 }
@@ -70,29 +76,56 @@ impl GameboardView {
             settings.size,
         ];
 
-        Rectangle::new(settings.background_color).draw(board_rect, &c.draw_state, c.transform, g);
+        if controller.gameboard.completed {
+            Rectangle::new(settings.completed_background_color).draw(
+                board_rect,
+                &c.draw_state,
+                c.transform,
+                g,
+            );
+        } else {
+            Rectangle::new(settings.background_color).draw(
+                board_rect,
+                &c.draw_state,
+                c.transform,
+                g,
+            );
 
-        for i in 0..9 {
-            for j in 0..9 {
-                if controller.gameboard.cells[i][j].loaded {
-                    color_cell(
-                        settings,
-                        [j, i],
-                        settings.loaded_cell_background_color,
-                        c,
-                        g,
-                    );
+            for i in 0..9 {
+                for j in 0..9 {
+                    if controller.gameboard.cells[i][j].loaded {
+                        color_cell(
+                            settings,
+                            [j, i],
+                            settings.loaded_cell_background_color,
+                            c,
+                            g,
+                        );
+                    } else if controller.gameboard.cells[i][j].invalid {
+                        color_cell(
+                            settings,
+                            [j, i],
+                            settings.invalid_cell_background_color,
+                            c,
+                            g,
+                        );
+                    }
                 }
             }
-        }
 
-        if let Some(ind) = controller.selected_cell {
-            let color = if !controller.gameboard.cells[ind[1]][ind[0]].loaded {
-                settings.selected_cell_background_color
-            } else {
-                settings.loaded_cell_background_color
-            };
-            color_cell(settings, ind, color, c, g);
+            if let Some(ind) = controller.selected_cell {
+                let cell = controller.gameboard.cells[ind[1]][ind[0]];
+                let color = if !cell.loaded {
+                    if !cell.invalid {
+                        settings.selected_cell_background_color
+                    } else {
+                        settings.invalid_selected_cell_background_color
+                    }
+                } else {
+                    settings.loaded_cell_background_color
+                };
+                color_cell(settings, ind, color, c, g);
+            }
         }
 
         let text_image = Image::new_color(settings.text_color);

piston-tutorials/sudoku/src/main.rs

@@ -27,7 +27,10 @@ fn main() {
     let mut events = Events::new(EventSettings::new().lazy(true));
     let mut gl = GlGraphics::new(opengl);
 
-    let gameboard = Gameboard::load_sdm("static/puzzle.sdm");
+    let args: Vec<_> = std::env::args().collect();
+    let infile = args.get(1).expect("usage: sudoku <sdm-file>");
+
+    let gameboard = Gameboard::load_sdm(infile);
     let mut gameboard_controller = GameboardController::new(gameboard);
     let gameboard_view_settings = GameboardViewSettings::new();
     let gameboard_view = GameboardView::new(gameboard_view_settings);

piston-tutorials/sudoku/static/puzzle-almost-solved.sdm

@@ -0,0 +1 @@
+517962483236847915498351762371695248654218397829734156765129834142583679983476520