1 files changed, 142 insertions, 0 deletions
diff --git a/examples/game_of_life/src/preset.rs b/examples/game_of_life/src/preset.rs
new file mode 100644
index 00000000..05157b6a
--- /dev/null
+++ b/examples/game_of_life/src/preset.rs
@@ -0,0 +1,142 @@
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum Preset {
+    Custom,
+    XKCD,
+    Glider,
+    SmallExploder,
+    Exploder,
+    TenCellRow,
+    LightweightSpaceship,
+    Tumbler,
+    GliderGun,
+    Acorn,
+}
+
+pub static ALL: &[Preset] = &[
+    Preset::Custom,
+    Preset::XKCD,
+    Preset::Glider,
+    Preset::SmallExploder,
+    Preset::Exploder,
+    Preset::TenCellRow,
+    Preset::LightweightSpaceship,
+    Preset::Tumbler,
+    Preset::GliderGun,
+    Preset::Acorn,
+];
+
+impl Preset {
+    pub fn life(self) -> Vec<(isize, isize)> {
+        #[rustfmt::skip]
+        let cells = match self {
+            Preset::Custom => vec![],
+            Preset::XKCD => vec![
+                "  xxx  ",
+                "  x x  ",
+                "  x x  ",
+                "   x   ",
+                "x xxx  ",
+                " x x x ",
+                "   x  x",
+                "  x x  ",
+                "  x x  ",
+            ],
+            Preset::Glider => vec![
+                " x ",
+                "  x",
+                "xxx"
+            ],
+            Preset::SmallExploder => vec![
+                " x ",
+                "xxx",
+                "x x",
+                " x ",
+            ],
+            Preset::Exploder => vec![
+                "x x x",
+                "x   x",
+                "x   x",
+                "x   x",
+                "x x x",
+            ],
+            Preset::TenCellRow => vec![
+                "xxxxxxxxxx",
+            ],
+            Preset::LightweightSpaceship => vec![
+                " xxxxx",
+                "x    x",
+                "     x",
+                "x   x ",
+            ],
+            Preset::Tumbler => vec![
+                " xx xx ",
+                " xx xx ",
+                "  x x  ",
+                "x x x x",
+                "x x x x",
+                "xx   xx",
+            ],
+            Preset::GliderGun => vec![
+                "                        x           ",
+                "                      x x           ",
+                "            xx      xx            xx",
+                "           x   x    xx            xx",
+                "xx        x     x   xx              ",
+                "xx        x   x xx    x x           ",
+                "          x     x       x           ",
+                "           x   x                    ",
+                "            xx                      ",
+            ],
+            Preset::Acorn => vec![
+                " x     ",
+                "   x   ",
+                "xx  xxx",
+            ],
+        };
+
+        let start_row = -(cells.len() as isize / 2);
+
+        cells
+            .into_iter()
+            .enumerate()
+            .flat_map(|(i, cells)| {
+                let start_column = -(cells.len() as isize / 2);
+
+                cells
+                    .chars()
+                    .enumerate()
+                    .filter(|(_, c)| !c.is_whitespace())
+                    .map(move |(j, _)| {
+                        (start_row + i as isize, start_column + j as isize)
+                    })
+            })
+            .collect()
+    }
+}
+
+impl Default for Preset {
+    fn default() -> Preset {
+        Preset::XKCD
+    }
+}
+
+impl std::fmt::Display for Preset {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(
+            f,
+            "{}",
+            match self {
+                Preset::Custom => "Custom",
+                Preset::XKCD => "xkcd #2293",
+                Preset::Glider => "Glider",
+                Preset::SmallExploder => "Small Exploder",
+                Preset::Exploder => "Exploder",
+                Preset::TenCellRow => "10 Cell Row",
+                Preset::LightweightSpaceship => "Lightweight spaceship",
+                Preset::Tumbler => "Tumbler",
+                Preset::GliderGun => "Gosper Glider Gun",
+                Preset::Acorn => "Acorn",
+            }
+        )
+    }
+}