Integrate persistent canvas controls with scenario lifetime rendering

crates/oa-desktop/src/behavior/scenario_lifecycle/render.rs

@@ -277,7 +277,13 @@ impl Rendering {
         }
     }
 
-    pub(in crate::behavior) fn draw_markers(&self, frame: &mut Frame, selected: Id, scale: f32) {
+    pub(in crate::behavior) fn draw_markers(
+        &self,
+        frame: &mut Frame,
+        selected: Id,
+        scale: f32,
+        pan: iced::Vector,
+    ) {
         for marker in &self.markers {
             let color = if selected == marker.event.occurrence || selected == marker.lifeline {
                 style::TEAL
@@ -302,10 +308,11 @@ impl Rendering {
                             },
                         ),
                     );
-                    if let Some(clip) = birth_label_clip(marker.capsule, scale, frame.size()) {
+                    if let Some(clip) = birth_label_clip(pan, marker.capsule, scale, frame.size()) {
                         // WGPU clipped frames start with an identity transform;
-                        // neither the parent's scale nor its clip is inherited.
+                        // neither the parent's pan/scale nor its clip is inherited.
                         frame.with_clip(clip, |label| {
+                            label.translate(pan);
                             label.scale(scale);
                             label.fill_text(Text {
                                 content: short(&marker.name, 18),
@@ -330,12 +337,20 @@ impl Rendering {
     }
 }
 
-fn birth_label_clip(capsule: Rectangle, scale: f32, viewport: Size) -> Option<Rectangle> {
-    if !scale.is_finite() || scale <= 0. {
+fn birth_label_clip(
+    pan: iced::Vector,
+    capsule: Rectangle,
+    scale: f32,
+    viewport: Size,
+) -> Option<Rectangle> {
+    if !pan.x.is_finite() || !pan.y.is_finite() || !scale.is_finite() || scale <= 0. {
         return None;
     }
     Rectangle::new(
-        Point::new((capsule.x + 8.) * scale, (capsule.y + 4.) * scale),
+        Point::new(
+            pan.x + (capsule.x + 8.) * scale,
+            pan.y + (capsule.y + 4.) * scale,
+        ),
         Size::new((capsule.width - 16.) * scale, (capsule.height - 8.) * scale),
     )
     .intersection(&Rectangle::new(Point::ORIGIN, viewport))