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center stage

This commit is contained in:
Skyler Lehmkuhl 2026-02-25 07:57:50 -05:00
parent 7c37e69687
commit 1621602f41
1 changed files with 15 additions and 0 deletions
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15
lightningbeam-ui/lightningbeam-editor/src/panes/stage.rs
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@ -2061,6 +2061,8 @@ pub struct StagePane {
// Camera state // Camera state
pan_offset: egui::Vec2, pan_offset: egui::Vec2,
zoom: f32, zoom: f32,
// Whether the initial view has been centered (on first render with a known rect)
needs_initial_center: bool,
// Interaction state // Interaction state
is_panning: bool, is_panning: bool,
last_pan_pos: Option<egui::Pos2>, last_pan_pos: Option<egui::Pos2>,
@ -2141,6 +2143,7 @@ impl StagePane {
Self { Self {
pan_offset: egui::Vec2::ZERO, pan_offset: egui::Vec2::ZERO,
zoom: 1.0, zoom: 1.0,
needs_initial_center: true,
is_panning: false, is_panning: false,
last_pan_pos: None, last_pan_pos: None,
instance_id, instance_id,
@ -6451,6 +6454,18 @@ impl PaneRenderer for StagePane {
// Store viewport rect for zoom-to-fit calculation // Store viewport rect for zoom-to-fit calculation
self.last_viewport_rect = Some(rect); self.last_viewport_rect = Some(rect);
// Center the document in the viewport on first render
if self.needs_initial_center {
self.needs_initial_center = false;
let document = shared.action_executor.document();
let doc_width = document.width as f32;
let doc_height = document.height as f32;
let viewport_size = rect.size();
let canvas_center = egui::vec2(doc_width / 2.0, doc_height / 2.0) * self.zoom;
let viewport_center = viewport_size / 2.0;
self.pan_offset = viewport_center - canvas_center;
}
// Check for completed eyedropper samples from GPU readback and apply them // Check for completed eyedropper samples from GPU readback and apply them
if let Ok(mut results) = EYEDROPPER_RESULTS if let Ok(mut results) = EYEDROPPER_RESULTS
.get_or_init(|| Arc::new(Mutex::new(std::collections::HashMap::new()))) .get_or_init(|| Arc::new(Mutex::new(std::collections::HashMap::new())))