Piece dropping

src/game.zig

@@ -43,10 +43,12 @@ fn render(self: Self) void {
 }
 pub fn tick(self: *Self) void {
     if (self.piece) |safe_piece| {
-
         std.debug.print("Piece: Col: {} Row: {}\n", .{ safe_piece.col, safe_piece.row });
 
         var key_state = SDL.SDL_GetKeyboardState(null);
+
+        // MOVEMENT
+
         if (key_state[SDL.SDL_SCANCODE_D] == 1 and !self.right_action) {
             self.right_action = true;
             self.piece = movement.moveRight(self.grid, safe_piece);
@@ -70,5 +72,14 @@ pub fn tick(self: *Self) void {
         }
     }
 
+    // DROP
+
+    if (self.piece) |safe_piece| {
+        if (safe_piece.dropped) {
+            self.grid = movement.drop(self.grid, safe_piece);
+            self.piece = Piece.init(Piece.Type.t);
+        }
+    }
+
     self.render();
 }

src/movement.zig

@@ -7,11 +7,13 @@ pub fn moveRight(grid: Grid, piece: Piece) Piece {
     for (new_piece.structure) |_, y| {
         for (new_piece.structure[y]) |_, x| {
             if (new_piece.structure[y][x] and
-                    @intCast(i32, x) + new_piece.col > Grid.ncolumns - 1) {
+                @intCast(i32, x) + new_piece.col > Grid.ncolumns - 1)
+            {
                 return piece;
             }
             if (new_piece.structure[y][x] and
-                    !grid.cells[@intCast(usize, new_piece.row + @intCast(i32, y))][@intCast(usize, new_piece.col + @intCast(i32, x))].free) {
+                !grid.cells[@intCast(usize, new_piece.row + @intCast(i32, y))][@intCast(usize, new_piece.col + @intCast(i32, x))].free)
+            {
                 return piece;
             }
         }
@@ -25,11 +27,13 @@ pub fn moveLeft(grid: Grid, piece: Piece) Piece {
     for (new_piece.structure) |_, y| {
         for (new_piece.structure[y]) |_, x| {
             if (new_piece.structure[y][x] and
-                    @intCast(i32, x) + new_piece.col < 0) {
+                @intCast(i32, x) + new_piece.col < 0)
+            {
                 return piece;
             }
             if (new_piece.structure[y][x] and
-                    !grid.cells[@intCast(usize, new_piece.row + @intCast(i32, y))][@intCast(usize, new_piece.col + @intCast(i32, x))].free) {
+                !grid.cells[@intCast(usize, new_piece.row + @intCast(i32, y))][@intCast(usize, new_piece.col + @intCast(i32, x))].free)
+            {
                 return piece;
             }
         }
@@ -43,14 +47,35 @@ pub fn moveDown(grid: Grid, piece: Piece) Piece {
     for (new_piece.structure) |_, y| {
         for (new_piece.structure[y]) |_, x| {
             if (new_piece.structure[y][x] and
-                    @intCast(i32, y) + new_piece.row > Grid.nrows - 1) {
-                return piece;
+                @intCast(i32, y) + new_piece.row > Grid.nrows - 1)
+            {
+                new_piece.row -= 1;
+                new_piece.dropped = true;
+                return new_piece;
             }
             if (new_piece.structure[y][x] and
-                    !grid.cells[@intCast(usize, new_piece.row + @intCast(i32, y))][@intCast(usize, new_piece.col + @intCast(i32, x))].free) {
-                return piece;
+                !grid.cells[@intCast(usize, new_piece.row + @intCast(i32, y))][@intCast(usize, new_piece.col + @intCast(i32, x))].free)
+            {
+                new_piece.row -= 1;
+                new_piece.dropped = true;
+                return new_piece;
             }
         }
     }
     return new_piece;
 }
+
+pub fn drop(grid: Grid, piece: Piece) Grid {
+    var new_grid = grid;
+
+    for (piece.structure) |_, y| {
+        for (piece.structure[y]) |_, x| {
+            if (piece.structure[y][x]) {
+                new_grid.cells[@intCast(usize, piece.row + @intCast(i32, y))][@intCast(usize, piece.col + @intCast(i32, x))].free = false;
+                new_grid.cells[@intCast(usize, piece.row + @intCast(i32, y))][@intCast(usize, piece.col + @intCast(i32, x))].color = piece.color;
+            }
+        }
+    }
+
+    return new_grid;
+}

src/piece.zig

@@ -18,9 +18,16 @@ pub const Type = enum {
 // Positions relative to a grid
 row: i32,
 col: i32,
+
+// 4x4 grid indicating piece form
 structure: [4][4]bool,
+
+// Should this be dropped and become part of the grid (flag)
+dropped: bool = false,
+
 color: SDL.SDL_Color,
 
+
 pub fn init(piece_type: Type) Self {
     return Self{
         .row = 0,

zig-cache/h/8fb74d559dd889eac55495e9f1d9dc64.txt

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