Add the circular involute as a new path segment (#819)

* Add circular involute path segment

* Remove duplicate and document involute

* Change radii to LengthUnit

Author: benjamaan476

modeling-cmds/src/ok_response.rs

@@ -845,6 +845,5 @@ define_ok_modeling_cmd_response_enum! {
         /// The response from the 'SetGridReferencePlane'.
         #[derive(Debug, Serialize, Deserialize, Clone, JsonSchema, ModelingCmdOutput)]
         pub struct SetGridReferencePlane {}
-
     }
 }

modeling-cmds/src/shared.rs

@@ -324,6 +324,22 @@ pub enum PathSegment {
         ///Whether or not interior and end are relative to the previous path position
         relative: bool,
     },
+    ///Adds a circular involute from the current position that goes through the given end_radius
+    ///and is rotated around the current point by angle.
+    CircularInvolute {
+        ///The involute is described between two circles, start_radius is the radius of the inner
+        ///circle.
+        start_radius: LengthUnit,
+        ///The involute is described between two circles, end_radius is the radius of the outer
+        ///circle.
+        end_radius: LengthUnit,
+        ///The angle to rotate the involute by. A value of zero will produce a curve with a tangent
+        ///along the x-axis at the start point of the curve.
+        angle: f64,
+        ///If reverse is true, the segment will start
+        ///from the end of the involute, otherwise it will start from that start.
+        reverse: bool,
+    },
 }
 
 /// An angle, with a specific unit.