1 files changed, 110 insertions, 0 deletions
diff --git a/src/attributes/spline_type.rs b/src/attributes/spline_type.rs
new file mode 100644
index 0000000..259496a
--- /dev/null
+++ b/src/attributes/spline_type.rs
@@ -0,0 +1,110 @@
+use crate::attributes::point::Point;
+use crate::dot::DotString;
+use std::borrow::Cow;
+
+/// The number of points in the list must be equivalent to 1 mod 3; note that this is not checked.
+/// TODO: should we check?
+pub struct SplineType {
+    pub start: Option<Point>,
+    pub end: Option<Point>,
+    pub spline_points: Vec<Point>,
+}
+
+impl<'a> DotString<'a> for SplineType {
+    fn dot_string(&self) -> Cow<'a, str> {
+        let mut dot_string = String::from("");
+
+        if let Some(end) = &self.end {
+            dot_string.push_str(format!("e,{:.1},{:.1} ", end.x, end.y).as_str());
+        }
+
+        if let Some(start) = &self.start {
+            dot_string.push_str(format!("s,{:.1},{:.1} ", start.x, start.y).as_str());
+        }
+
+        let mut iter = self.spline_points.iter();
+        let first = iter.next().unwrap();
+        dot_string.push_str(format!("{}", first.dot_string()).as_str());
+        for point in iter {
+            dot_string.push_str(" ");
+            dot_string.push_str(format!("{}", point.dot_string()).as_str());
+        }
+
+        dot_string.into()
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use crate::attributes::{Point, SplineType};
+    use crate::DotString;
+
+    #[test]
+    fn spline_type() {
+        let spline_type = SplineType {
+            end: None,
+            start: None,
+            spline_points: vec![
+                Point::new_2d(0.0, 0.0),
+                Point::new_2d(1.0, 1.0),
+                Point::new_2d(1.0, -1.0),
+            ],
+        };
+
+        assert_eq!("0.0,0.0 1.0,1.0 1.0,-1.0", spline_type.dot_string());
+    }
+
+    #[test]
+    fn spline_type_end() {
+        let spline_type = SplineType {
+            end: Some(Point::new_2d(2.0, 0.0)),
+            start: None,
+            spline_points: vec![
+                Point::new_2d(0.0, 0.0),
+                Point::new_2d(1.0, 1.0),
+                Point::new_2d(1.0, -1.0),
+            ],
+        };
+
+        assert_eq!(
+            "e,2.0,0.0 0.0,0.0 1.0,1.0 1.0,-1.0",
+            spline_type.dot_string()
+        );
+    }
+
+    #[test]
+    fn spline_type_start() {
+        let spline_type = SplineType {
+            end: None,
+            start: Some(Point::new_2d(-1.0, 0.0)),
+            spline_points: vec![
+                Point::new_2d(0.0, 0.0),
+                Point::new_2d(1.0, 1.0),
+                Point::new_2d(1.0, -1.0),
+            ],
+        };
+
+        assert_eq!(
+            "s,-1.0,0.0 0.0,0.0 1.0,1.0 1.0,-1.0",
+            spline_type.dot_string()
+        );
+    }
+
+    #[test]
+    fn spline_type_complete() {
+        let spline_type = SplineType {
+            end: Some(Point::new_2d(2.0, 0.0)),
+            start: Some(Point::new_2d(-1.0, 0.0)),
+            spline_points: vec![
+                Point::new_2d(0.0, 0.0),
+                Point::new_2d(1.0, 1.0),
+                Point::new_2d(1.0, -1.0),
+            ],
+        };
+
+        assert_eq!(
+            "e,2.0,0.0 s,-1.0,0.0 0.0,0.0 1.0,1.0 1.0,-1.0",
+            spline_type.dot_string()
+        );
+    }
+}