1 files changed, 73 insertions, 0 deletions

diff --git a/src/brush.rs b/src/brush.rs
new file mode 100644
index 0000000..98c2b23
--- /dev/null
+++ b/src/brush.rs
@@ -0,0 +1,73 @@
+use std::fmt;
+
+use crate::bitmap::MapPoint;
+
+#[derive(Debug, Copy, Clone)]
+pub enum Brush {
+    Line {
+        size: u8,
+        start: Option<MapPoint>,
+        extend: bool,
+    },
+    Circle {
+        size: u8,
+    },
+    RectSelect {
+        start: MapPoint,
+        end: MapPoint,
+    },
+    Fill,
+    Custom {
+        size: u8,
+    },
+}
+
+impl Brush {
+    pub fn grow(&mut self) -> Result<(), BrushError> {
+        match self {
+            Brush::Line { ref mut size, .. } => *size += 1,
+            Brush::Circle { ref mut size, .. } => *size += 1,
+            Brush::Custom { ref mut size, .. } => *size += 1,
+            _ => return Err(BrushError::CannotIncreaseSize),
+        }
+        Ok(())
+    }
+    pub fn shrink(&mut self) -> Result<(), BrushError> {
+        match self {
+            Brush::Line { ref mut size, .. } => *size += size.saturating_sub(1),
+            Brush::Circle { ref mut size, .. } => *size += size.saturating_sub(1),
+            Brush::Custom { ref mut size, .. } => *size += size.saturating_sub(1),
+            _ => return Err(BrushError::CannotIncreaseSize),
+        }
+        Ok(())
+    }
+    pub fn new() -> Self {
+        Brush::Circle { size: 0 }
+    }
+    pub fn line(size: u8, extend: bool) -> Self {
+        Brush::Line {
+            size,
+            start: None,
+            extend,
+        }
+    }
+    pub fn is_line(&self) -> bool {
+        matches!(self, Self::Line { .. })
+    }
+}
+
+impl fmt::Display for Brush {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            Brush::Line { extend, .. } => write!(f, "LINE{}", if *extend { "+" } else { "" }),
+            Brush::Circle { .. } => write!(f, "CIRCLE"),
+            Brush::RectSelect { .. } => write!(f, "SELECT"),
+            Brush::Fill => write!(f, "FILL"),
+            Brush::Custom { .. } => write!(f, "CUSTOM"),
+        }
+    }
+}
+
+pub enum BrushError {
+    CannotIncreaseSize,
+}