Created workspace

canvas/src/icon_bitfield.rs

@@ -0,0 +1,117 @@
+use crate::Card;
+use crate::CardField;
+use crate::Icon;
+use crate::Painting;
+
+#[derive(Debug, Default, Clone, PartialEq, Eq)]
+pub(crate) struct IconBitfield {
+    circle: u8,
+    square: u8,
+    triangle: u8,
+    color: u8,
+    points: u8,
+}
+
+impl IconBitfield {
+    pub(crate) fn get_icon_bits(&self, icon: Icon) -> u8 {
+        match icon {
+            Icon::Circle => self.circle,
+            Icon::Square => self.square,
+            Icon::Triangle => self.triangle,
+            Icon::Color => self.color,
+        }
+    }
+    pub(crate) fn get_point_bits(&self) -> u8 {
+        self.points
+    }
+
+    pub(crate) fn add_icon(&mut self, icon: Icon, index: u8) {
+        let field = match icon {
+            Icon::Circle => &mut self.circle,
+            Icon::Square => &mut self.square,
+            Icon::Triangle => &mut self.triangle,
+            Icon::Color => &mut self.color,
+        };
+        *field |= 1 << index;
+    }
+    pub fn add_field(&mut self, field: CardField, index: u8) {
+        debug_assert!(index < 5);
+        match field {
+            CardField::Icon(icon) => self.add_icon(icon, index),
+            CardField::DoubleIcon((icon1, icon2)) => {
+                self.add_icon(icon1, index);
+                self.add_icon(icon2, index);
+            }
+            CardField::PointsPer(_) => self.points |= 1 << index,
+            CardField::Empty => (),
+        }
+    }
+    pub fn new(card: &Card) -> Self {
+        let mut result = Self::default();
+        (0u8..)
+            .zip(card.field.iter())
+            .for_each(|(index, field)| result.add_field(field.clone(), index));
+        result
+    }
+
+    pub fn from_painting(painting: &Painting) -> Self {
+        let mut bits = Self::new(&painting[0]);
+        bits.layer_below(&Self::new(&painting[1]))
+            .layer_below(&Self::new(&painting[2]));
+        bits
+    }
+
+    pub fn all_fields(&self) -> u8 {
+        self.circle | self.square | self.triangle | self.color | self.points
+    }
+
+    /// Result of putting the other card below this one
+    pub fn layer_below(&mut self, other: &Self) -> &mut Self {
+        // 1 x 0 = 0
+        // 0 x 0 = 0
+        // 0 x 1 = 1
+        // 1 x 1 = 0
+        // Should be !a & b
+
+        let bitmask = !self.all_fields() & other.all_fields();
+        self.circle |= other.circle & bitmask;
+        self.square |= other.square & bitmask;
+        self.triangle |= other.triangle & bitmask;
+        self.color |= other.color & bitmask;
+        self.points |= other.points & bitmask;
+        self
+    }
+}
+
+#[test]
+fn test_add_field() {
+    let mut x: IconBitfield = Default::default();
+    x.add_icon(Icon::Circle, 2);
+    let expected = IconBitfield {
+        circle: 0b00100,
+        ..Default::default()
+    };
+    assert_eq!(x, expected);
+}
+
+#[test]
+fn test_layer_below() {
+    let mut a: IconBitfield = IconBitfield {
+        color: 0b00010,
+        points: 0b01000,
+        ..Default::default()
+    };
+    let b = IconBitfield {
+        triangle: a.get_point_bits(),
+        square: 0b10000,
+        ..Default::default()
+    };
+    let expected = IconBitfield {
+        color: a.get_icon_bits(Icon::Color),
+        points: a.get_point_bits(),
+        square: b.get_icon_bits(Icon::Square),
+        ..Default::default()
+    };
+    a.layer_below(&b);
+    assert_eq!(a, expected);
+}