Preserve inset line alignment in PPTX

crates/model/src/style.rs

@@ -232,6 +232,34 @@ pub enum LineJoin {
     Miter,
 }
 
+#[derive(Clone, Copy, Debug, Default, PartialEq, Eq, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub enum LineAlign {
+    #[default]
+    Center,
+    Inside,
+    Outside,
+}
+
+impl LineAlign {
+    pub fn xml(self) -> &'static str {
+        match self {
+            LineAlign::Center => "ctr",
+            LineAlign::Inside => "in",
+            LineAlign::Outside => "out",
+        }
+    }
+
+    pub fn from_xml(value: &str) -> Option<Self> {
+        match value {
+            "ctr" => Some(LineAlign::Center),
+            "in" => Some(LineAlign::Inside),
+            "out" => Some(LineAlign::Outside),
+            _ => None,
+        }
+    }
+}
+
 #[derive(Clone, Copy, Debug, Default, PartialEq, Eq, Serialize, Deserialize)]
 #[serde(rename_all = "camelCase")]
 pub enum Compound {
@@ -324,6 +352,7 @@ pub struct Line {
     pub dash: Option<Dash>,
     pub cap: Option<LineCap>,
     pub join: Option<LineJoin>,
+    pub align: Option<LineAlign>,
     pub compound: Option<Compound>,
     pub head: Option<LineEnd>,
     pub tail: Option<LineEnd>,
@@ -347,6 +376,7 @@ impl Line {
         }
         self.cap = self.cap.or(parent.cap);
         self.join = self.join.or(parent.join);
+        self.align = self.align.or(parent.align);
         self.compound = self.compound.or(parent.compound);
         if self.head.is_none() {
             self.head.clone_from(&parent.head);

crates/pptx/src/read/dml.rs

@@ -3,8 +3,8 @@
 use deckcraft_color::{ColorTransform, Rgba, SchemeSlot};
 use deckcraft_geom::{Xfrm, emu_to_pt};
 use deckcraft_model::style::{
-    ColorBase, ColorRef, Compound, Dash, Effects, Fill, Glow, Gradient, GradientShape, GradientStop, Line, LineCap, LineEnd, LineJoin, PatternFill,
-    PictureFill, PictureMode, Reflection, Shadow,
+    ColorBase, ColorRef, Compound, Dash, Effects, Fill, Glow, Gradient, GradientShape, GradientStop, Line, LineAlign, LineCap, LineEnd, LineJoin,
+    PatternFill, PictureFill, PictureMode, Reflection, Shadow,
 };
 use deckcraft_model::text::{
     Action, Align, Anchor, AutoFit, BodyProps, Bullet, Caps, Hyperlink, LevelStyle, ListStyle, ParaProps, Paragraph, Run, RunKind, RunProps, Spacing,
@@ -222,6 +222,7 @@ pub fn line(imp: &mut Imp, part: &Part, ln: &El) -> Line {
         _ => LineCap::Flat,
     });
     l.compound = ln.attr("cmpd").map(Compound::from_xml);
+    l.align = ln.attr("algn").and_then(LineAlign::from_xml);
     l.fill = fill_of(imp, part, ln);
     for e in ln.elements() {
         match e.local() {

crates/pptx/src/write/dml.rs

@@ -1,7 +1,9 @@
 //! DrawingML writing: colours, fills, lines, effects, transforms and text.
 
 use deckcraft_geom::{Xfrm, pt_to_emu};
-use deckcraft_model::style::{ColorBase, ColorRef, Compound, Dash, Effects, Fill, GradientShape, Line, LineCap, LineJoin, PictureFill, PictureMode};
+use deckcraft_model::style::{
+    ColorBase, ColorRef, Compound, Dash, Effects, Fill, GradientShape, Line, LineAlign, LineCap, LineJoin, PictureFill, PictureMode,
+};
 use deckcraft_model::text::{
     Action, AutoFit, BodyProps, Bullet, Caps, Hyperlink, ListStyle, ParaProps, Paragraph, RunKind, RunProps, Spacing, Strike, TextBody,
 };
@@ -208,6 +210,7 @@ pub fn line(w: &mut W, x: &mut Exp, o: &mut Out, tag: &str, l: &Line) {
                 LineCap::Flat => "flat",
             }),
         )
+        .o("algn", l.align.map(LineAlign::xml))
         .o("cmpd", l.compound.map(Compound::xml));
     w.open(tag, a);
     if let Some(f) = &l.fill {

crates/pptx/tests/it/roundtrip.rs

@@ -488,6 +488,23 @@ fn shapes_fills_lines_effects_round_trip() {
     assert_eq!(by_name(&q.slides[1], "Group").id, by_name(&p.slides[1], "Group").id);
 }
 
+#[test]
+fn line_alignment_survives_two_pptx_round_trips() {
+    let mut p = Presentation::default();
+    let mut inside = shape(&mut p, "Inset line", 20.0, 20.0, 100.0, 100.0);
+    inside.line = Some(Line { align: Some(deckcraft_model::style::LineAlign::Inside), ..Default::default() });
+    let mut outside = shape(&mut p, "Outset line", 140.0, 20.0, 100.0, 100.0);
+    outside.line = Some(Line { align: Some(deckcraft_model::style::LineAlign::Outside), ..Default::default() });
+    let mut centered = shape(&mut p, "Centered line", 260.0, 20.0, 100.0, 100.0);
+    centered.line = Some(Line { align: Some(deckcraft_model::style::LineAlign::Center), ..Default::default() });
+    Arc::make_mut(&mut p.slides[0]).shapes.extend([inside, outside, centered]);
+
+    let q = round(&round(&p));
+    assert_eq!(by_name(&q.slides[0], "Inset line").line.as_ref().and_then(|line| line.align), Some(deckcraft_model::style::LineAlign::Inside));
+    assert_eq!(by_name(&q.slides[0], "Outset line").line.as_ref().and_then(|line| line.align), Some(deckcraft_model::style::LineAlign::Outside));
+    assert_eq!(by_name(&q.slides[0], "Centered line").line.as_ref().and_then(|line| line.align), Some(deckcraft_model::style::LineAlign::Center));
+}
+
 #[test]
 fn pictures_media_and_ink_round_trip() {
     let p = rich_deck();