Rework to split layer generation and triangle rendering.

src/mushroom.rs

@@ -1,14 +1,38 @@
+use serde_derive::Serialize;
+
+#[derive(clap::ValueEnum, Clone, Default, Debug, Serialize, PartialEq)]
+pub enum CapStyle {
+    #[default]
+    Cylinder,
+    Dome,
+    Pointed,
+}
+
 #[derive(Debug, PartialEq)]
 pub struct Mushroom {
     /// Stalk height in millimeters. Zero for default.
     pub stalk_h: f32,
 
     /// Stalk diameter in millimeters. Zero for default.
-    pub stalk_d: f32,
+    pub stalk_r: f32,
 
     /// Cap height in millimeters. Zero for default.
     pub cap_h: f32,
 
     /// Stalk diameter in millimeters. Zero for default.
-    pub cap_d: f32,
+    pub cap_r: f32,
+
+    pub cap_style: CapStyle,
+}
+
+impl Mushroom {
+    /// Total height of the mushroom.
+    pub fn height(&self) -> f32 {
+        return self.stalk_h + self.cap_h;
+    }
+
+    /// Maximum radius of the mushroom.
+    pub fn radius(&self) -> f32 {
+        return self.stalk_r.max(self.cap_r) / 2.0;
+    }
 }