added range for topspar

src/main.rs

@@ -36,7 +36,7 @@ fn main() {
 
     // struts
     for port in [true,false] {
-        let mut wing = wing(&wing_airfoil, STRUTS/2, WINGSPAN/2.0, CHORD, CHORD * WING_TAPER);
+        let mut wing = wing(&wing_airfoil, STRUTS/2, WINGSPAN/2.0, CHORD, CHORD * WING_TAPER, SparType::Top);
         wing = scad!(Translate(vec3(0.0, FUSELAGE_GAP,0.0)); wing);
         if port {
             wing = scad!(Mirror(vec3(0.0, 1.0, 0.0)); wing);
@@ -53,7 +53,7 @@ fn main() {
 
     // rudder
     let mut rudder = scad!(Rotate(90.0, vec3(1.0, 0.0, 0.0)));
-    rudder.add_child(wing(&control_airfoil, RUDDER_STRUTS, RUDDER_HEIGHT, RUDDER_CHORD, RUDDER_CHORD * RUDDER_TAPER));
+    rudder.add_child(wing(&control_airfoil, RUDDER_STRUTS, RUDDER_HEIGHT, RUDDER_CHORD, RUDDER_CHORD * RUDDER_TAPER, SparType::Center));
     rudder.add_child(spar(RUDDER_HEIGHT, false));
     rudder = scad!(Translate(vec3(LENGTH-RUDDER_CHORD, 0.0, 0.0)); rudder);
     scad_file.add_object(rudder);
@@ -61,7 +61,7 @@ fn main() {
     // elevator
     let mut elevator = scad!(Translate(vec3(LENGTH-ELEVATOR_CHORD, 0.0,0.0)));
     for port in [true,false] {
-        let mut wing = wing(&control_airfoil, ELEVATOR_STRUTS, ELEVATOR_HEIGHT, ELEVATOR_CHORD, ELEVATOR_CHORD * ELEVATOR_TAPER);
+        let mut wing = wing(&control_airfoil, ELEVATOR_STRUTS, ELEVATOR_HEIGHT, ELEVATOR_CHORD, ELEVATOR_CHORD * ELEVATOR_TAPER, SparType::Top);
         wing = scad!(Translate(vec3(0.0, FUSELAGE_GAP,0.0)); wing);
         if port {
             wing = scad!(Mirror(vec3(0.0, 1.0, 0.0)); wing);
@@ -93,33 +93,27 @@ fn main() {
     allparts.write_to_file(format!("build/allparts.scad"));
 }
 
+enum SparType {
+    None,
+    Top,
+    Center,
+}
+
 /// returns a extruded airfoil with the given dimensions
-fn strut(airfoil: &Airfoil, chord: f32, width: f32) -> ScadObject {
+fn strut(airfoil: &Airfoil, chord: f32, width: f32, spar: &SparType) -> ScadObject {
     let aerofoil = scad::PolygonParameters::new(airfoil.get_points().clone());
     let shape = scad!(Polygon(aerofoil));
 
     let strut_hole = {
-        let points = airfoil.get_points();
+        match spar {
-        let points = &points[0.. points.len() / 2];
+            SparType::Top => topspar_negative(airfoil, chord, 0.1..0.6),
-        let perimeter = span_length(points);
+            SparType::Center => {
-        let span = points_in_range(&Vec::from(points), perimeter * 0.4.. perimeter);
+                scad!(Union)
-
+            },
-        let mut mask = scad!(Union);
+            SparType::None => {
-
+                scad!(Union)
-        let mut last: Option<ScadObject> = None;
-        for point in span {
-            let mut current = scad!(Square(vec2(0.001/ chord, CARDBOARD_WIDTH / chord)));
-            current = scad!(Translate2d(point.clone() - vec2(0.0, CARDBOARD_WIDTH/chord)); current);
-            if let Some(last_mask) = last {
-                let mut hull = scad!(Hull);
-                hull.add_child(current.clone());
-                hull.add_child(last_mask);
-                mask.add_child(hull);
             }
-            last = Some(current);
         }
-        register_part(mask.clone());
-        mask
     };
 
     let mut strut_shape = scad!(Difference);
@@ -142,6 +136,31 @@ fn strut(airfoil: &Airfoil, chord: f32, width: f32) -> ScadObject {
     rotated
 }
 
+fn topspar_negative(airfoil: &Airfoil, chord: f32, range: Range<f32>) -> ScadObject {
+    let points = airfoil.get_points();
+    let points = &points[0.. points.len() / 2];
+    let perimeter = span_length(points);
+
+    let span = points_in_range(&Vec::from(points), perimeter * (1.0-range.end) .. perimeter * (1.0-range.start));
+
+    let mut mask = scad!(Union);
+
+    let mut last: Option<ScadObject> = None;
+    for point in span {
+        let mut current = scad!(Square(vec2(0.001/ chord, CARDBOARD_WIDTH / chord)));
+        current = scad!(Translate2d(point.clone() - vec2(0.0, CARDBOARD_WIDTH/chord)); current);
+        if let Some(last_mask) = last {
+            let mut hull = scad!(Hull);
+            hull.add_child(current.clone());
+            hull.add_child(last_mask);
+            mask.add_child(hull);
+        }
+        last = Some(current);
+    }
+    register_part(mask.clone());
+    mask
+}
+
 fn spar(length: f32, center: bool) -> ScadObject {
     let mut spar = scad!(Union);
 
@@ -169,7 +188,7 @@ fn lerp(a: f32, b:f32, x:f32) -> f32 {
     a*(1.0-x) + b*x
 }
 
-fn wing(aerofoil: &Airfoil, struts: usize, length: f32, chord: f32, taper: f32) -> ScadObject {
+fn wing(aerofoil: &Airfoil, struts: usize, length: f32, chord: f32, taper: f32, spar: SparType) -> ScadObject {
     let mut wing = scad!(Translate(vec3(0.0,0.0,0.0)));
 
     // struts
@@ -183,7 +202,7 @@ fn wing(aerofoil: &Airfoil, struts: usize, length: f32, chord: f32, taper: f32)
 
         let mut transform = scad!(Translate(vec3(0.0, spacing ,0.0)));
 
-        let strut = strut(&aerofoil, chord, CARDBOARD_WIDTH);
+        let strut = strut(&aerofoil, chord, CARDBOARD_WIDTH, &spar);
         transform.add_child(strut);
         wing.add_child(transform);
     }