Merge pull request #1357 from ramox81/codex/vertical-constraint-parity

Match Vertical geometric constraint behavior

# Conflicts:
#	src/app/commands/draw.rs
#	src/scene/parametric_constraints.rs
#	src/ui/overlay.rs

src/ui/overlay.rs

@@ -39,11 +39,16 @@ fn is_fixed_glyph(label: &str) -> bool {
     label == "F" || label == crate::scene::parametric_constraints::FIXED_POINT_GLYPH
 }
 
+/// Vertical's two axis-mark labels (`parametric_constraints::vertical_glyph_label`).
+fn is_vertical_glyph(label: &str) -> bool {
+    label == "│" || label == crate::scene::parametric_constraints::VERTICAL_POINTS_GLYPH
+}
+
 fn constraint_glyph_size(label: &str) -> Size {
     if is_compact_coincident_glyph(label) {
         return Size::new(COINCIDENT_GLYPH_SIZE, COINCIDENT_GLYPH_SIZE);
     }
-    if label == "G²" || is_fixed_glyph(label) {
+    if label == "G²" || is_fixed_glyph(label) || is_vertical_glyph(label) {
         let side = CONSTRAINT_GLYPH_SIZE + CONSTRAINT_GLYPH_PAD_Y * 2.0;
         return Size::new(side, side);
     }
@@ -157,6 +162,49 @@ fn draw_fixed_constraint_glyph(
     }
 }
 
+/// The reference bar's Vertical mark: a red datum line hatched on its left,
+/// the constrained direction beside it, plus the orange point marker for a
+/// two-point relation.
+fn draw_vertical_constraint_glyph(
+    frame: &mut canvas::Frame,
+    center: Point,
+    text: Color,
+    point_marker: bool,
+) {
+    let datum = Color::from_rgb8(214, 76, 76);
+    let datum_x = center.x - 2.5;
+    let stroke = canvas::Stroke::default().with_color(datum).with_width(1.5);
+    frame.stroke(
+        &canvas::Path::line(
+            Point::new(datum_x, center.y - 6.5),
+            Point::new(datum_x, center.y + 6.5),
+        ),
+        stroke.clone(),
+    );
+    for step in 0..3 {
+        let y = center.y - 4.5 + step as f32 * 4.0;
+        frame.stroke(
+            &canvas::Path::line(Point::new(datum_x, y), Point::new(datum_x - 4.0, y + 3.5)),
+            stroke.clone(),
+        );
+    }
+    frame.stroke(
+        &canvas::Path::line(
+            Point::new(center.x + 2.5, center.y - 6.0),
+            Point::new(center.x + 2.5, center.y + 6.0),
+        ),
+        canvas::Stroke::default().with_color(text).with_width(1.4),
+    );
+    if point_marker {
+        frame.stroke(
+            &canvas::Path::rectangle(Point::new(center.x + 4.5, center.y - 2.3), Size::new(4.6, 4.6)),
+            canvas::Stroke::default()
+                .with_color(Color::from_rgb8(224, 130, 62))
+                .with_width(1.2),
+        );
+    }
+}
+
 fn constraint_glyph_box(
     anchor: Point,
     outward: [f32; 2],
@@ -2091,6 +2139,13 @@ impl canvas::Program<Message> for SelectionCanvas {
                             bg,
                             label == crate::scene::parametric_constraints::FIXED_POINT_GLYPH,
                         );
+                    } else if is_vertical_glyph(label) {
+                        draw_vertical_constraint_glyph(
+                            &mut frame,
+                            glyph_center,
+                            fg,
+                            label == crate::scene::parametric_constraints::VERTICAL_POINTS_GLYPH,
+                        );
                     } else {
                         frame.fill_text(canvas::Text {
                             content: label.clone(),