implemented non-centered spar

src/main.rs

@@ -155,18 +155,32 @@ fn mirrored_wing(wing_airfoil: &SeligFile, wing_config: &WingConfig) -> Construc
 
 /// Returns (struts, spar)
 fn wing(wing_airfoil: &SeligFile, wing_config: &WingConfig, spar: SparType) -> (Construct, Construct) {
-    let (mut wing, wing_parts) = wing_struts(
+    let (wing, wing_parts) = wing_struts(
         wing_airfoil,
         &wing_config,
-        spar,
+        &spar,
     ).tup();
     // TODO: other spar types
+    let spar = match spar {
+        SparType::None => {
+
+            scad!(Union)
+        },
+        SparType::Top => {
             let top_spar = topwing_spar(
                 wing_airfoil,
                 wing_config,
             );
             let mut spar = scad!(Difference; top_spar);
             spar.add_child(wing.clone());
+            spar
+        },
+        SparType::Center => {
+            // TODO: negative in struts
+            // TODO: taper
+            centered_cube(vec3(wing_config.chord * 0.5, wing_config.length, CARDBOARD_WIDTH), (false, false, true))
+        },
+    };
 
     let spar_flat = scad!(Projection(false); spar.clone());
 
@@ -313,7 +327,7 @@ fn lerp(a: f32, b: f32, x: f32) -> f32 {
 fn wing_struts(
     aerofoil: &SeligFile,
     config: &WingConfig,
-    spar: SparType,
+    spar: &SparType,
 ) -> Construct {
     let mut wing = scad!(Translate(vec3(0.0, 0.0, 0.0)));
     let mut parts = Vec::new();