1 files changed, 55 insertions, 0 deletions
diff --git a/src/attributes/point.rs b/src/attributes/point.rs
new file mode 100644
index 0000000..819044e
--- /dev/null
+++ b/src/attributes/point.rs
@@ -0,0 +1,55 @@
+use crate::dot::DotString;
+use std::borrow::Cow;
+
+pub struct Point {
+    pub x: f32,
+    pub y: f32,
+    pub z: Option<f32>,
+
+    /// specify that the node position should not change.
+    pub force_pos: bool,
+}
+
+impl Point {
+    pub fn new_2d(x: f32, y: f32) -> Self {
+        Self::new(x, y, None, false)
+    }
+
+    pub fn new_3d(x: f32, y: f32, z: f32) -> Self {
+        Self::new(x, y, Some(z), false)
+    }
+
+    pub fn new(x: f32, y: f32, z: Option<f32>, force_pos: bool) -> Self {
+        Self { x, y, z, force_pos }
+    }
+}
+
+impl<'a> DotString<'a> for Point {
+    fn dot_string(&self) -> Cow<'a, str> {
+        let mut slice = format!("{:.1},{:.1}", self.x, self.y);
+        if self.z.is_some() {
+            slice.push_str(format!(",{:.1}", self.z.unwrap()).as_str());
+        }
+        if self.force_pos {
+            slice.push_str("!")
+        }
+        slice.into()
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use crate::attributes::Point;
+    use crate::DotString;
+
+    #[test]
+    fn dot_string() {
+        assert_eq!("1.0,2.0", Point::new_2d(1.0, 2.0).dot_string());
+        assert_eq!("1.0,2.0,0.0", Point::new_3d(1.0, 2.0, 0.0).dot_string());
+        assert_eq!("1.0,2.0!", Point::new(1.0, 2.0, None, true).dot_string());
+        assert_eq!(
+            "1.0,2.0,0.0!",
+            Point::new(1.0, 2.0, Some(0.0), true).dot_string()
+        );
+    }
+}