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refactor: split svg.rs & app.rs

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Tomáš Mládek 2026-01-25 01:13:51 +01:00
parent 0192226609
commit adfbe04d30
13 changed files with 1077 additions and 1052 deletions
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795
src/app.rs
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@ -1,795 +0,0 @@
use crate::svg::{Renderable as _, SvgContent};
use crate::text_cache::TextCache;
/// We derive Deserialize/Serialize so we can persist app state on shutdown.
#[derive(serde::Deserialize, serde::Serialize)]
#[serde(default)]
pub struct TemplateApp {
#[serde(skip)]
svg_content: Option<SvgContent>,
/// Pan offset in SVG coordinates.
pan_x: f32,
pan_y: f32,
/// Zoom factor (1.0 = 100%).
zoom: f32,
#[serde(skip)]
show_menu_bar: bool,
#[serde(skip)]
show_debug: bool,
#[serde(skip)]
render_internal_areas: bool,
/// Exponential moving average of frame time for stable FPS display.
#[serde(skip)]
fps_ema: f32,
/// Whether we've auto-fitted the start viewport.
#[serde(skip)]
did_fit_start: bool,
/// Last known cursor position (for edge scrolling even without movement).
#[serde(skip)]
last_cursor_pos: Option<egui::Pos2>,
/// Whether a reset-to-start was requested (from UI)
#[serde(skip)]
reset_view_requested: bool,
/// Smooth camera animation state.
#[serde(skip)]
view_animation: Option<ViewAnimation>,
/// Last pointer position for manual drag tracking (smoother than `Sense::drag`).
#[serde(skip)]
last_pointer_pos: Option<egui::Pos2>,
/// Whether we're currently in a drag operation.
#[serde(skip)]
is_dragging: bool,
/// Text rendering cache for smooth scaling.
#[serde(skip)]
text_cache: Option<TextCache>,
}
impl Default for TemplateApp {
fn default() -> Self {
Self {
svg_content: None,
pan_x: 0.0,
pan_y: 0.0,
zoom: 1.0,
show_menu_bar: false,
show_debug: false,
render_internal_areas: false,
fps_ema: 60.0,
last_pointer_pos: None,
is_dragging: false,
text_cache: None,
did_fit_start: false,
last_cursor_pos: None,
reset_view_requested: false,
view_animation: None,
}
}
}
#[derive(Debug, Clone)]
struct ViewAnimation {
start_center_x: f32,
start_center_y: f32,
start_zoom: f32,
target_center_x: f32,
target_center_y: f32,
target_zoom: f32,
elapsed: f32,
duration: f32,
}
impl TemplateApp {
const NAV_DURATION: f32 = 1.5;
/// Called once before the first frame.
pub fn new(cc: &eframe::CreationContext<'_>) -> Self {
log::info!("Initializing application...");
log::debug!("Installing image loaders...");
egui_extras::install_image_loaders(&cc.egui_ctx);
log::debug!("Loading app state...");
let mut app: Self = cc
.storage
.and_then(|s| eframe::get_value(s, eframe::APP_KEY))
.unwrap_or_default();
// Load SVG content
let svg_path = "../line-and-surface/content/intro.svg";
log::info!("Loading SVG from: {svg_path}");
let start = std::time::Instant::now();
match SvgContent::from_file(svg_path) {
Ok(content) => {
let elapsed = start.elapsed();
log::info!(
"Loaded SVG in {:.2?}: {} video scrolls, {} audio areas, {} anchors, {} texts",
elapsed,
content.video_scrolls.len(),
content.audio_areas.len(),
content.anchors.len(),
content.texts.len()
);
if let Some((vb_x, vb_y, vb_w, vb_h)) = content.viewbox {
log::debug!("SVG viewbox: ({vb_x}, {vb_y}, {vb_w}, {vb_h})");
app.pan_x = -vb_x;
app.pan_y = -vb_y;
}
app.svg_content = Some(content);
}
Err(e) => {
log::error!("Failed to load SVG: {e}");
}
}
log::info!("Application initialized");
app
}
fn cancel_animation(&mut self) {
self.view_animation = None;
}
fn begin_view_animation(
&mut self,
target_pan_x: f32,
target_pan_y: f32,
target_zoom: f32,
duration: f32,
canvas_rect: &egui::Rect,
) {
if duration <= 0.0 {
self.pan_x = target_pan_x;
self.pan_y = target_pan_y;
self.zoom = target_zoom;
self.view_animation = None;
return;
}
let (start_center_x, start_center_y) =
view_center(self.pan_x, self.pan_y, self.zoom, canvas_rect);
let (target_center_x, target_center_y) =
view_center(target_pan_x, target_pan_y, target_zoom, canvas_rect);
self.view_animation = Some(ViewAnimation {
start_center_x,
start_center_y,
start_zoom: self.zoom,
target_center_x,
target_center_y,
target_zoom,
elapsed: 0.0,
duration,
});
}
fn update_animation(&mut self, dt: f32, canvas_rect: &egui::Rect) {
if let Some(anim) = &mut self.view_animation {
anim.elapsed += dt;
let t = (anim.elapsed / anim.duration).clamp(0.0, 1.0);
let eased = ease_in_out_cubic(t);
let zoom = lerp(
anim.start_zoom,
anim.target_zoom,
zoom_ease(t, anim.start_zoom, anim.target_zoom),
);
let center_x = lerp(anim.start_center_x, anim.target_center_x, eased);
let center_y = lerp(anim.start_center_y, anim.target_center_y, eased);
if canvas_rect.width() > 0.0 && canvas_rect.height() > 0.0 {
let visible_w = canvas_rect.width() / zoom;
let visible_h = canvas_rect.height() / zoom;
self.pan_x = -center_x + visible_w * 0.5;
self.pan_y = -center_y + visible_h * 0.5;
}
self.zoom = zoom;
if t >= 1.0 {
self.view_animation = None;
}
}
}
fn request_view_to_rect(
&mut self,
rect: (f32, f32, f32, f32),
canvas_rect: &egui::Rect,
duration: f32,
) {
if let Some((pan_x, pan_y, zoom)) = compute_view_for_rect(rect, canvas_rect) {
self.begin_view_animation(pan_x, pan_y, zoom, duration, canvas_rect);
}
}
/// Handle zoom towards a specific point.
fn zoom_towards(&mut self, new_zoom: f32, pos: egui::Pos2, canvas_rect: &egui::Rect) {
let svg_x = (pos.x - canvas_rect.left()) / self.zoom - self.pan_x;
let svg_y = (pos.y - canvas_rect.top()) / self.zoom - self.pan_y;
self.pan_x = (pos.x - canvas_rect.left()) / new_zoom - svg_x;
self.pan_y = (pos.y - canvas_rect.top()) / new_zoom - svg_y;
self.zoom = new_zoom;
}
}
fn ease_in_out_cubic(t: f32) -> f32 {
if t < 0.5 {
4.0 * t * t * t
} else {
1.0 - (-2.0 * t + 2.0).powi(3) / 2.0
}
}
fn ease_out_cubic(t: f32) -> f32 {
1.0 - (1.0 - t).powi(3)
}
fn zoom_ease(t: f32, start: f32, target: f32) -> f32 {
if target > start {
// Zooming in: bias progress late but soften landing
let biased = t.powf(1.6);
ease_in_out_cubic(biased)
} else {
// Zooming out: shed zoom early
ease_out_cubic(t)
}
}
fn lerp(a: f32, b: f32, t: f32) -> f32 {
a + (b - a) * t
}
fn compute_view_for_rect(
rect: (f32, f32, f32, f32),
canvas_rect: &egui::Rect,
) -> Option<(f32, f32, f32)> {
if canvas_rect.width() <= 0.0 || canvas_rect.height() <= 0.0 {
return None;
}
let (sx, sy, sw, sh) = rect;
if sw <= 0.0 || sh <= 0.0 {
return None;
}
let scale_x = canvas_rect.width() / sw;
let scale_y = canvas_rect.height() / sh;
let fit_zoom = scale_x.min(scale_y).clamp(0.01, 100.0);
let visible_w = canvas_rect.width() / fit_zoom;
let visible_h = canvas_rect.height() / fit_zoom;
let pan_x = -sx + (visible_w - sw) * 0.5;
let pan_y = -sy + (visible_h - sh) * 0.5;
Some((pan_x, pan_y, fit_zoom))
}
fn view_center(pan_x: f32, pan_y: f32, zoom: f32, canvas_rect: &egui::Rect) -> (f32, f32) {
let visible_w = canvas_rect.width() / zoom;
let visible_h = canvas_rect.height() / zoom;
(-pan_x + visible_w * 0.5, -pan_y + visible_h * 0.5)
}
impl eframe::App for TemplateApp {
fn save(&mut self, storage: &mut dyn eframe::Storage) {
eframe::set_value(storage, eframe::APP_KEY, self);
}
#[expect(clippy::too_many_lines)]
fn update(&mut self, ctx: &egui::Context, _frame: &mut eframe::Frame) {
// Batch input reading
let (
escape_pressed,
f3_pressed,
f_pressed,
scroll_delta,
zoom_delta,
pointer_latest,
pointer_pos,
frame_time,
primary_down,
primary_pressed,
primary_released,
space_pressed,
) = ctx.input(|i| {
(
i.key_pressed(egui::Key::Escape),
i.key_pressed(egui::Key::F3),
i.key_pressed(egui::Key::F),
i.smooth_scroll_delta.y,
i.zoom_delta(),
i.pointer.latest_pos(),
i.pointer.hover_pos(),
i.stable_dt,
i.pointer.primary_down(),
i.pointer.primary_pressed(),
i.pointer.primary_released(),
i.key_pressed(egui::Key::Space),
)
});
if primary_pressed || scroll_delta != 0.0 || (zoom_delta - 1.0).abs() > f32::EPSILON {
self.cancel_animation();
}
if let Some(pos) = pointer_latest.or(pointer_pos) {
self.last_cursor_pos = Some(pos);
}
let is_fullscreen = ctx.input(|i| i.viewport().fullscreen.unwrap_or(false));
// Update FPS EMA
if frame_time > 0.0 {
const ALPHA: f32 = 0.1;
self.fps_ema = ALPHA * (1.0 / frame_time) + (1.0 - ALPHA) * self.fps_ema;
}
// Toggle UI elements
if escape_pressed {
self.show_menu_bar = !self.show_menu_bar;
}
if f3_pressed {
self.show_debug = !self.show_debug;
}
// Menu bar
if self.show_menu_bar {
egui::TopBottomPanel::top("top_panel").show(ctx, |ui| {
egui::MenuBar::new().ui(ui, |ui| {
#[cfg(not(target_arch = "wasm32"))]
{
ui.menu_button("File", |ui| {
if ui.button("Quit").clicked() {
ctx.send_viewport_cmd(egui::ViewportCommand::Close);
}
});
ui.add_space(16.0);
}
egui::widgets::global_theme_preference_buttons(ui);
ui.separator();
ui.label(format!("Zoom: {:.0}%", self.zoom * 100.0));
if ui.button("Reset View").clicked() {
self.reset_view_requested = true;
}
ui.separator();
let debug_label = if self.show_debug {
"Hide Debug (F3)"
} else {
"Show Debug (F3)"
};
if ui.button(debug_label).clicked() {
self.show_debug = !self.show_debug;
}
});
});
}
let mut rendered_count = 0u32;
let background_rgb = self
.svg_content
.as_ref()
.and_then(|content| content.background_color)
.unwrap_or([0, 0, 0]);
let background_color =
egui::Color32::from_rgb(background_rgb[0], background_rgb[1], background_rgb[2]);
egui::CentralPanel::default().show(ctx, |ui| {
let (response, painter) =
ui.allocate_painter(ui.available_size(), egui::Sense::click_and_drag());
let canvas_rect = response.rect;
painter.rect_filled(canvas_rect, 0.0, background_color);
// Advance any pending camera animation (needs canvas size)
let anim_dt = if frame_time > 0.0 {
frame_time
} else {
1.0 / 60.0
};
self.update_animation(anim_dt, &canvas_rect);
if self.view_animation.is_some() {
ctx.request_repaint();
}
// Fullscreen toggle via double-click or 'F'
if response.double_clicked() || f_pressed {
ctx.send_viewport_cmd(egui::ViewportCommand::Fullscreen(!is_fullscreen));
}
if !self.did_fit_start {
if let Some(ref content) = self.svg_content {
if let Some(rect) = content.start_rect.or(content.viewbox) {
if let Some((pan_x, pan_y, zoom)) =
compute_view_for_rect(rect, &canvas_rect)
{
self.pan_x = pan_x;
self.pan_y = pan_y;
self.zoom = zoom;
}
}
}
self.did_fit_start = true;
ctx.request_repaint();
}
if space_pressed {
self.reset_view_requested = true;
}
if self.reset_view_requested {
if let Some(ref content) = self.svg_content {
if let Some(rect) = content.start_rect.or(content.viewbox) {
self.request_view_to_rect(rect, &canvas_rect, TemplateApp::NAV_DURATION);
}
}
// Always clear to avoid loops even if no rect present
self.reset_view_requested = false;
}
// Drag handling
if primary_pressed && response.hovered() {
self.is_dragging = true;
self.last_pointer_pos = pointer_pos;
}
if primary_released {
self.is_dragging = false;
self.last_pointer_pos = None;
}
if self.is_dragging && primary_down {
if let (Some(current), Some(last)) = (pointer_pos, self.last_pointer_pos) {
let delta = current - last;
self.pan_x += delta.x / self.zoom;
self.pan_y += delta.y / self.zoom;
}
self.last_pointer_pos = pointer_pos;
}
// Zoom handling
if response.hovered() {
if scroll_delta != 0.0 {
let factor = 1.0 + scroll_delta * 0.001;
let new_zoom = (self.zoom * factor).clamp(0.01, 100.0);
if let Some(pos) = pointer_pos {
self.zoom_towards(new_zoom, pos, &canvas_rect);
} else {
self.zoom = new_zoom;
}
}
if zoom_delta != 1.0 {
let new_zoom = (self.zoom * zoom_delta).clamp(0.01, 100.0);
if let Some(pos) = pointer_pos {
self.zoom_towards(new_zoom, pos, &canvas_rect);
} else {
self.zoom = new_zoom;
}
}
}
// Edge scrolling (only in fullscreen)
let edge_pointer = pointer_latest.or(self.last_cursor_pos);
if is_fullscreen {
if let Some(mouse_pos) = edge_pointer {
let dt = if frame_time > 0.0 {
frame_time
} else {
1.0 / 60.0
};
let nx = if canvas_rect.width() > 0.0 {
((mouse_pos.x - canvas_rect.left()) / canvas_rect.width()).clamp(0.0, 1.0)
} else {
0.5
};
let ny = if canvas_rect.height() > 0.0 {
((mouse_pos.y - canvas_rect.top()) / canvas_rect.height()).clamp(0.0, 1.0)
} else {
0.5
};
let edge_threshold = 0.15;
let mut vx = 0.0;
let mut vy = 0.0;
if nx < edge_threshold {
vx = (edge_threshold - nx) / edge_threshold;
} else if nx > 1.0 - edge_threshold {
vx = -(nx - (1.0 - edge_threshold)) / edge_threshold;
}
if ny < edge_threshold {
vy = (edge_threshold - ny) / edge_threshold;
} else if ny > 1.0 - edge_threshold {
vy = -(ny - (1.0 - edge_threshold)) / edge_threshold;
}
if vx != 0.0 || vy != 0.0 {
let view_w = canvas_rect.width() / self.zoom;
let view_h = canvas_rect.height() / self.zoom;
let speed_w = view_w; // per second at full intensity
let speed_h = view_h; // per second at full intensity
self.pan_x += vx * speed_w * dt;
self.pan_y += vy * speed_h * dt;
// keep scrolling even without new input events
ctx.request_repaint();
}
}
}
// Element colors
let internal_alpha = (0.3_f32 * 255.0).round() as u8;
let video_scroll_color =
egui::Color32::from_rgba_unmultiplied(255, 0, 0, internal_alpha);
let audio_area_color = egui::Color32::from_rgba_unmultiplied(0, 0, 255, internal_alpha);
let anchor_color = egui::Color32::from_rgba_unmultiplied(64, 255, 64, internal_alpha);
let text_color = egui::Color32::from_rgb(255, 255, 255);
// Initialize text cache (renders in white, color applied as tint)
if self.text_cache.is_none() {
self.text_cache = Some(TextCache::new());
}
// Extract values for closures
let pan_x = self.pan_x;
let pan_y = self.pan_y;
let zoom = self.zoom;
let svg_to_screen = |x: f32, y: f32| -> egui::Pos2 {
egui::pos2(
(x + pan_x) * zoom + canvas_rect.left(),
(y + pan_y) * zoom + canvas_rect.top(),
)
};
let screen_to_svg = |pos: egui::Pos2| -> (f32, f32) {
(
(pos.x - canvas_rect.left()) / zoom - pan_x,
(pos.y - canvas_rect.top()) / zoom - pan_y,
)
};
let mut pending_navigation: Option<(f32, f32, f32, f32)> = None;
if let Some(ref content) = self.svg_content {
let pointer_svg_hover = pointer_latest.or(pointer_pos).and_then(|p| {
if canvas_rect.contains(p) {
Some(screen_to_svg(p))
} else {
None
}
});
let click_svg_pos = if primary_released && !self.is_dragging {
pointer_latest.or(pointer_pos).and_then(|p| {
if canvas_rect.contains(p) {
Some(screen_to_svg(p))
} else {
None
}
})
} else {
None
};
if let Some((svg_x, svg_y)) = click_svg_pos {
if let Some(link) = content.anchor_links.iter().find(|link| {
svg_x >= link.x
&& svg_x <= link.x + link.width
&& svg_y >= link.y
&& svg_y <= link.y + link.height
}) {
if let Some(anchor) =
content.anchors.iter().find(|a| a.id == link.target_id)
{
pending_navigation = Some(anchor.bounds());
} else {
log::warn!("Anchor link target not found: {}", link.target_id);
}
}
}
if let Some((svg_x, svg_y)) = pointer_svg_hover {
if content.anchor_links.iter().any(|link| {
svg_x >= link.x
&& svg_x <= link.x + link.width
&& svg_y >= link.y
&& svg_y <= link.y + link.height
}) {
ctx.output_mut(|o| o.cursor_icon = egui::CursorIcon::PointingHand);
}
}
if self.render_internal_areas {
let mut hovered_descs: Vec<String> = Vec::new();
let pointer_svg = pointer_pos.map(screen_to_svg);
// Video scrolls
for vs in &content.video_scrolls {
let (x, y, w, h) = vs.bounds();
let rect = egui::Rect::from_min_max(
svg_to_screen(x, y),
svg_to_screen(x + w, y + h),
);
if rect.intersects(canvas_rect) {
painter.rect_filled(rect, 0.0, video_scroll_color);
rendered_count += 1;
}
if let Some((svg_x, svg_y)) = pointer_svg {
if svg_x >= x && svg_x <= x + w && svg_y >= y && svg_y <= y + h {
hovered_descs.push(format!("Video: {}", vs.desc));
}
}
}
// Audio areas
for aa in &content.audio_areas {
let center = svg_to_screen(aa.cx, aa.cy);
let radius = aa.radius * zoom;
let rect = egui::Rect::from_min_max(
egui::pos2(center.x - radius, center.y - radius),
egui::pos2(center.x + radius, center.y + radius),
);
if rect.intersects(canvas_rect) {
painter.circle_filled(center, radius, audio_area_color);
rendered_count += 1;
}
if let Some((svg_x, svg_y)) = pointer_svg {
let dx = svg_x - aa.cx;
let dy = svg_y - aa.cy;
if dx * dx + dy * dy <= aa.radius * aa.radius {
hovered_descs.push(format!("Audio: {}", aa.desc));
}
}
}
// Anchors
for anchor in &content.anchors {
let (x, y, w, h) = anchor.bounds();
let rect = egui::Rect::from_min_max(
svg_to_screen(x, y),
svg_to_screen(x + w, y + h),
);
if rect.intersects(canvas_rect) {
painter.rect_filled(rect, 0.0, anchor_color);
rendered_count += 1;
}
if let Some((svg_x, svg_y)) = pointer_svg {
if svg_x >= x && svg_x <= x + w && svg_y >= y && svg_y <= y + h {
hovered_descs.push(format!("Anchor: {}", anchor.id));
}
}
}
if !hovered_descs.is_empty() {
egui::Tooltip::always_open(
ctx.clone(),
ui.layer_id(),
egui::Id::new("internal-area-desc"),
egui::PopupAnchor::Pointer,
)
.gap(12.0)
.show(|ui| {
for desc in hovered_descs {
ui.label(desc);
}
});
}
}
// Text elements
let text_cache = self.text_cache.as_mut().expect("just initialized");
for text_elem in &content.texts {
let (x, y, w, h) = text_elem.bounds();
let rect =
egui::Rect::from_min_max(svg_to_screen(x, y), svg_to_screen(x + w, y + h));
if !rect.intersects(canvas_rect) {
continue;
}
let display_font_size = text_elem.font_size * zoom;
if display_font_size >= 0.5 {
for line in &text_elem.lines {
if line.content.trim().is_empty() {
continue;
}
let cached = text_cache.get_or_create(
ctx,
&line.content,
text_elem.font_size,
zoom,
);
let scale_factor = zoom / cached.render_scale;
let display_width = cached.width as f32 * scale_factor;
let display_height = cached.height as f32 * scale_factor;
let y_adjusted = line.y - text_elem.font_size * 0.8;
let pos = svg_to_screen(line.x, y_adjusted);
painter.image(
cached.texture.id(),
egui::Rect::from_min_size(
pos,
egui::vec2(display_width, display_height),
),
egui::Rect::from_min_max(
egui::pos2(0.0, 0.0),
egui::pos2(1.0, 1.0),
),
text_color, // Tint the white texture with desired color
);
}
}
rendered_count += 1;
}
}
if let Some(rect) = pending_navigation {
self.request_view_to_rect(rect, &canvas_rect, TemplateApp::NAV_DURATION);
}
});
// Debug window
if self.show_debug {
egui::Window::new("Debug")
.anchor(egui::Align2::RIGHT_TOP, [-10.0, 10.0])
.resizable(false)
.collapsible(false)
.show(ctx, |ui| {
ui.label(format!("FPS: {:.1}", self.fps_ema));
ui.label(format!("Pixels per point: {:.2}", ctx.pixels_per_point()));
ui.separator();
ui.label(format!("Pan: ({:.1}, {:.1})", self.pan_x, self.pan_y));
ui.label(format!("Zoom: {:.2}x", self.zoom));
ui.separator();
if let Some(ref content) = self.svg_content {
let total = content.video_scrolls.len()
+ content.audio_areas.len()
+ content.anchors.len()
+ content.texts.len();
ui.label(format!("Total elements: {total}"));
ui.label(format!("Rendered: {rendered_count}"));
ui.label(format!(
"Culled: {}",
total.saturating_sub(rendered_count as usize)
));
}
ui.separator();
ui.checkbox(&mut self.render_internal_areas, "Render internal areas");
if let Some(ref cache) = self.text_cache {
ui.separator();
let bytes = cache.cache_memory_bytes();
let mb = bytes as f32 / (1024.0 * 1024.0);
ui.label(format!(
"Text cache: {} entries (~{mb:.2} MB)",
cache.cache_size()
));
}
});
}
}
}

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use super::LasApp;
#[derive(Debug, Clone)]
pub(super) struct ViewAnimation {
start_center_x: f32,
start_center_y: f32,
start_zoom: f32,
target_center_x: f32,
target_center_y: f32,
target_zoom: f32,
elapsed: f32,
duration: f32,
}
impl LasApp {
pub(super) fn cancel_animation(&mut self) {
self.view_animation = None;
}
pub(super) fn begin_view_animation(
&mut self,
target_pan_x: f32,
target_pan_y: f32,
target_zoom: f32,
duration: f32,
canvas_rect: &egui::Rect,
) {
if duration <= 0.0 {
self.pan_x = target_pan_x;
self.pan_y = target_pan_y;
self.zoom = target_zoom;
self.view_animation = None;
return;
}
let (start_center_x, start_center_y) =
view_center(self.pan_x, self.pan_y, self.zoom, canvas_rect);
let (target_center_x, target_center_y) =
view_center(target_pan_x, target_pan_y, target_zoom, canvas_rect);
self.view_animation = Some(ViewAnimation {
start_center_x,
start_center_y,
start_zoom: self.zoom,
target_center_x,
target_center_y,
target_zoom,
elapsed: 0.0,
duration,
});
}
pub(super) fn update_animation(&mut self, dt: f32, canvas_rect: &egui::Rect) {
if let Some(anim) = &mut self.view_animation {
anim.elapsed += dt;
let t = (anim.elapsed / anim.duration).clamp(0.0, 1.0);
let eased = ease_in_out_cubic(t);
let zoom = lerp(
anim.start_zoom,
anim.target_zoom,
zoom_ease(t, anim.start_zoom, anim.target_zoom),
);
let center_x = lerp(anim.start_center_x, anim.target_center_x, eased);
let center_y = lerp(anim.start_center_y, anim.target_center_y, eased);
if canvas_rect.width() > 0.0 && canvas_rect.height() > 0.0 {
let visible_w = canvas_rect.width() / zoom;
let visible_h = canvas_rect.height() / zoom;
self.pan_x = -center_x + visible_w * 0.5;
self.pan_y = -center_y + visible_h * 0.5;
}
self.zoom = zoom;
if t >= 1.0 {
self.view_animation = None;
}
}
}
pub(super) fn request_view_to_rect(
&mut self,
rect: (f32, f32, f32, f32),
canvas_rect: &egui::Rect,
duration: f32,
) {
if let Some((pan_x, pan_y, zoom)) = compute_view_for_rect(rect, canvas_rect) {
self.begin_view_animation(pan_x, pan_y, zoom, duration, canvas_rect);
}
}
/// Handle zoom towards a specific point.
pub(super) fn zoom_towards(
&mut self,
new_zoom: f32,
pos: egui::Pos2,
canvas_rect: &egui::Rect,
) {
let svg_x = (pos.x - canvas_rect.left()) / self.zoom - self.pan_x;
let svg_y = (pos.y - canvas_rect.top()) / self.zoom - self.pan_y;
self.pan_x = (pos.x - canvas_rect.left()) / new_zoom - svg_x;
self.pan_y = (pos.y - canvas_rect.top()) / new_zoom - svg_y;
self.zoom = new_zoom;
}
}
fn ease_in_out_cubic(t: f32) -> f32 {
if t < 0.5 {
4.0 * t * t * t
} else {
1.0 - (-2.0 * t + 2.0).powi(3) / 2.0
}
}
fn ease_out_cubic(t: f32) -> f32 {
1.0 - (1.0 - t).powi(3)
}
fn zoom_ease(t: f32, start: f32, target: f32) -> f32 {
if target > start {
// Zooming in: bias progress late but soften landing
let biased = t.powf(1.6);
ease_in_out_cubic(biased)
} else {
// Zooming out: shed zoom early
ease_out_cubic(t)
}
}
fn lerp(a: f32, b: f32, t: f32) -> f32 {
a + (b - a) * t
}
pub(super) fn compute_view_for_rect(
rect: (f32, f32, f32, f32),
canvas_rect: &egui::Rect,
) -> Option<(f32, f32, f32)> {
if canvas_rect.width() <= 0.0 || canvas_rect.height() <= 0.0 {
return None;
}
let (sx, sy, sw, sh) = rect;
if sw <= 0.0 || sh <= 0.0 {
return None;
}
let scale_x = canvas_rect.width() / sw;
let scale_y = canvas_rect.height() / sh;
let fit_zoom = scale_x.min(scale_y).clamp(0.01, 100.0);
let visible_w = canvas_rect.width() / fit_zoom;
let visible_h = canvas_rect.height() / fit_zoom;
let pan_x = -sx + (visible_w - sw) * 0.5;
let pan_y = -sy + (visible_h - sh) * 0.5;
Some((pan_x, pan_y, fit_zoom))
}
fn view_center(pan_x: f32, pan_y: f32, zoom: f32, canvas_rect: &egui::Rect) -> (f32, f32) {
let visible_w = canvas_rect.width() / zoom;
let visible_h = canvas_rect.height() / zoom;
(-pan_x + visible_w * 0.5, -pan_y + visible_h * 0.5)
}

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#[derive(Clone, Copy)]
pub(super) struct InputSnapshot {
pub(super) escape_pressed: bool,
pub(super) f3_pressed: bool,
pub(super) f_pressed: bool,
pub(super) scroll_delta: f32,
pub(super) zoom_delta: f32,
pub(super) pointer_latest: Option<egui::Pos2>,
pub(super) pointer_pos: Option<egui::Pos2>,
pub(super) frame_time: f32,
pub(super) primary_down: bool,
pub(super) primary_pressed: bool,
pub(super) primary_released: bool,
pub(super) space_pressed: bool,
}
impl InputSnapshot {
pub(super) fn collect(ctx: &egui::Context) -> Self {
ctx.input(|i| Self {
escape_pressed: i.key_pressed(egui::Key::Escape),
f3_pressed: i.key_pressed(egui::Key::F3),
f_pressed: i.key_pressed(egui::Key::F),
scroll_delta: i.smooth_scroll_delta.y,
zoom_delta: i.zoom_delta(),
pointer_latest: i.pointer.latest_pos(),
pointer_pos: i.pointer.hover_pos(),
frame_time: i.stable_dt,
primary_down: i.pointer.primary_down(),
primary_pressed: i.pointer.primary_pressed(),
primary_released: i.pointer.primary_released(),
space_pressed: i.key_pressed(egui::Key::Space),
})
}
}

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use crate::svg::SvgContent;
use crate::text_cache::TextCache;
mod animation;
mod input;
mod render;
use input::InputSnapshot;
/// We derive Deserialize/Serialize so we can persist app state on shutdown.
#[derive(serde::Deserialize, serde::Serialize)]
#[serde(default)]
pub struct LasApp {
#[serde(skip)]
svg_content: Option<SvgContent>,
/// Pan offset in SVG coordinates.
pan_x: f32,
pan_y: f32,
/// Zoom factor (1.0 = 100%).
zoom: f32,
#[serde(skip)]
show_menu_bar: bool,
#[serde(skip)]
show_debug: bool,
#[serde(skip)]
render_internal_areas: bool,
/// Exponential moving average of frame time for stable FPS display.
#[serde(skip)]
fps_ema: f32,
/// Whether we've auto-fitted the start viewport.
#[serde(skip)]
did_fit_start: bool,
/// Last known cursor position (for edge scrolling even without movement).
#[serde(skip)]
last_cursor_pos: Option<egui::Pos2>,
/// Whether a reset-to-start was requested (from UI)
#[serde(skip)]
reset_view_requested: bool,
/// Smooth camera animation state.
#[serde(skip)]
view_animation: Option<animation::ViewAnimation>,
/// Last pointer position for manual drag tracking (smoother than `Sense::drag`).
#[serde(skip)]
last_pointer_pos: Option<egui::Pos2>,
/// Whether we're currently in a drag operation.
#[serde(skip)]
is_dragging: bool,
/// Text rendering cache for smooth scaling.
#[serde(skip)]
text_cache: Option<TextCache>,
}
impl Default for LasApp {
fn default() -> Self {
Self {
svg_content: None,
pan_x: 0.0,
pan_y: 0.0,
zoom: 1.0,
show_menu_bar: false,
show_debug: false,
render_internal_areas: false,
fps_ema: 60.0,
last_pointer_pos: None,
is_dragging: false,
text_cache: None,
did_fit_start: false,
last_cursor_pos: None,
reset_view_requested: false,
view_animation: None,
}
}
}
impl LasApp {
const NAV_DURATION: f32 = 1.5;
/// Called once before the first frame.
pub fn new(cc: &eframe::CreationContext<'_>) -> Self {
log::info!("Initializing application...");
log::debug!("Installing image loaders...");
egui_extras::install_image_loaders(&cc.egui_ctx);
log::debug!("Loading app state...");
let mut app: Self = cc
.storage
.and_then(|s| eframe::get_value(s, eframe::APP_KEY))
.unwrap_or_default();
// Load SVG content
let svg_path = "../line-and-surface/content/intro.svg";
log::info!("Loading SVG from: {svg_path}");
let start = std::time::Instant::now();
match SvgContent::from_file(svg_path) {
Ok(content) => {
let elapsed = start.elapsed();
log::info!(
"Loaded SVG in {:.2?}: {} video scrolls, {} audio areas, {} anchors, {} texts",
elapsed,
content.video_scrolls.len(),
content.audio_areas.len(),
content.anchors.len(),
content.texts.len()
);
if let Some((vb_x, vb_y, vb_w, vb_h)) = content.viewbox {
log::debug!("SVG viewbox: ({vb_x}, {vb_y}, {vb_w}, {vb_h})");
app.pan_x = -vb_x;
app.pan_y = -vb_y;
}
app.svg_content = Some(content);
}
Err(e) => {
log::error!("Failed to load SVG: {e}");
}
}
log::info!("Application initialized");
app
}
fn update_fps(&mut self, frame_time: f32) {
if frame_time > 0.0 {
const ALPHA: f32 = 0.1;
self.fps_ema = ALPHA * (1.0 / frame_time) + (1.0 - ALPHA) * self.fps_ema;
}
}
}
impl eframe::App for LasApp {
fn save(&mut self, storage: &mut dyn eframe::Storage) {
eframe::set_value(storage, eframe::APP_KEY, self);
}
fn update(&mut self, ctx: &egui::Context, _frame: &mut eframe::Frame) {
let input = InputSnapshot::collect(ctx);
if input.primary_pressed
|| input.scroll_delta != 0.0
|| (input.zoom_delta - 1.0).abs() > f32::EPSILON
{
self.cancel_animation();
}
if let Some(pos) = input.pointer_latest.or(input.pointer_pos) {
self.last_cursor_pos = Some(pos);
}
let is_fullscreen = ctx.input(|i| i.viewport().fullscreen.unwrap_or(false));
self.update_fps(input.frame_time);
if input.escape_pressed {
self.show_menu_bar = !self.show_menu_bar;
}
if input.f3_pressed {
self.show_debug = !self.show_debug;
}
if self.show_menu_bar {
self.render_menu_bar(ctx);
}
let rendered_count = egui::CentralPanel::default()
.show(ctx, |ui| self.render_canvas(ctx, ui, &input, is_fullscreen))
.inner;
if self.show_debug {
self.render_debug_window(ctx, rendered_count);
}
}
}

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use super::LasApp;
use super::animation::compute_view_for_rect;
use super::input::InputSnapshot;
use crate::svg::Renderable as _;
impl LasApp {
pub(super) fn render_menu_bar(&mut self, ctx: &egui::Context) {
egui::TopBottomPanel::top("top_panel").show(ctx, |ui| {
egui::MenuBar::new().ui(ui, |ui| {
#[cfg(not(target_arch = "wasm32"))]
{
ui.menu_button("File", |ui| {
if ui.button("Quit").clicked() {
ctx.send_viewport_cmd(egui::ViewportCommand::Close);
}
});
ui.add_space(16.0);
}
egui::widgets::global_theme_preference_buttons(ui);
ui.separator();
ui.label(format!("Zoom: {:.0}%", self.zoom * 100.0));
if ui.button("Reset View").clicked() {
self.reset_view_requested = true;
}
ui.separator();
let debug_label = if self.show_debug {
"Hide Debug (F3)"
} else {
"Show Debug (F3)"
};
if ui.button(debug_label).clicked() {
self.show_debug = !self.show_debug;
}
});
});
}
pub(super) fn render_debug_window(&mut self, ctx: &egui::Context, rendered_count: u32) {
egui::Window::new("Debug")
.anchor(egui::Align2::RIGHT_TOP, [-10.0, 10.0])
.resizable(false)
.collapsible(false)
.show(ctx, |ui| {
ui.label(format!("FPS: {:.1}", self.fps_ema));
ui.label(format!("Pixels per point: {:.2}", ctx.pixels_per_point()));
ui.separator();
ui.label(format!("Pan: ({:.1}, {:.1})", self.pan_x, self.pan_y));
ui.label(format!("Zoom: {:.2}x", self.zoom));
ui.separator();
if let Some(ref content) = self.svg_content {
let total = content.video_scrolls.len()
+ content.audio_areas.len()
+ content.anchors.len()
+ content.texts.len();
ui.label(format!("Total elements: {total}"));
ui.label(format!("Rendered: {rendered_count}"));
ui.label(format!(
"Culled: {}",
total.saturating_sub(rendered_count as usize)
));
}
ui.separator();
ui.checkbox(&mut self.render_internal_areas, "Render internal areas");
if let Some(ref cache) = self.text_cache {
ui.separator();
let bytes = cache.cache_memory_bytes();
let mb = bytes as f32 / (1024.0 * 1024.0);
ui.label(format!(
"Text cache: {} entries (~{mb:.2} MB)",
cache.cache_size()
));
}
});
}
#[expect(clippy::too_many_lines)]
pub(super) fn render_canvas(
&mut self,
ctx: &egui::Context,
ui: &mut egui::Ui,
input: &InputSnapshot,
is_fullscreen: bool,
) -> u32 {
let (response, painter) =
ui.allocate_painter(ui.available_size(), egui::Sense::click_and_drag());
let canvas_rect = response.rect;
let background_rgb = self
.svg_content
.as_ref()
.and_then(|content| content.background_color)
.unwrap_or([0, 0, 0]);
let background_color =
egui::Color32::from_rgb(background_rgb[0], background_rgb[1], background_rgb[2]);
painter.rect_filled(canvas_rect, 0.0, background_color);
let anim_dt = if input.frame_time > 0.0 {
input.frame_time
} else {
1.0 / 60.0
};
self.update_animation(anim_dt, &canvas_rect);
if self.view_animation.is_some() {
ctx.request_repaint();
}
if response.double_clicked() || input.f_pressed {
ctx.send_viewport_cmd(egui::ViewportCommand::Fullscreen(!is_fullscreen));
}
if !self.did_fit_start {
if let Some(ref content) = self.svg_content {
if let Some(rect) = content.start_rect.or(content.viewbox) {
if let Some((pan_x, pan_y, zoom)) = compute_view_for_rect(rect, &canvas_rect) {
self.pan_x = pan_x;
self.pan_y = pan_y;
self.zoom = zoom;
}
}
}
self.did_fit_start = true;
ctx.request_repaint();
}
if input.space_pressed {
self.reset_view_requested = true;
}
if self.reset_view_requested {
if let Some(ref content) = self.svg_content {
if let Some(rect) = content.start_rect.or(content.viewbox) {
self.request_view_to_rect(rect, &canvas_rect, Self::NAV_DURATION);
}
}
self.reset_view_requested = false;
}
if input.primary_pressed && response.hovered() {
self.is_dragging = true;
self.last_pointer_pos = input.pointer_pos;
}
if input.primary_released {
self.is_dragging = false;
self.last_pointer_pos = None;
}
if self.is_dragging && input.primary_down {
if let (Some(current), Some(last)) = (input.pointer_pos, self.last_pointer_pos) {
let delta = current - last;
self.pan_x += delta.x / self.zoom;
self.pan_y += delta.y / self.zoom;
}
self.last_pointer_pos = input.pointer_pos;
}
if response.hovered() {
if input.scroll_delta != 0.0 {
let factor = 1.0 + input.scroll_delta * 0.001;
let new_zoom = (self.zoom * factor).clamp(0.01, 100.0);
if let Some(pos) = input.pointer_pos {
self.zoom_towards(new_zoom, pos, &canvas_rect);
} else {
self.zoom = new_zoom;
}
}
if input.zoom_delta != 1.0 {
let new_zoom = (self.zoom * input.zoom_delta).clamp(0.01, 100.0);
if let Some(pos) = input.pointer_pos {
self.zoom_towards(new_zoom, pos, &canvas_rect);
} else {
self.zoom = new_zoom;
}
}
}
let edge_pointer = input.pointer_latest.or(self.last_cursor_pos);
if is_fullscreen {
if let Some(mouse_pos) = edge_pointer {
let dt = if input.frame_time > 0.0 {
input.frame_time
} else {
1.0 / 60.0
};
let nx = if canvas_rect.width() > 0.0 {
((mouse_pos.x - canvas_rect.left()) / canvas_rect.width()).clamp(0.0, 1.0)
} else {
0.5
};
let ny = if canvas_rect.height() > 0.0 {
((mouse_pos.y - canvas_rect.top()) / canvas_rect.height()).clamp(0.0, 1.0)
} else {
0.5
};
let edge_threshold = 0.15;
let mut vx = 0.0;
let mut vy = 0.0;
if nx < edge_threshold {
vx = (edge_threshold - nx) / edge_threshold;
} else if nx > 1.0 - edge_threshold {
vx = -(nx - (1.0 - edge_threshold)) / edge_threshold;
}
if ny < edge_threshold {
vy = (edge_threshold - ny) / edge_threshold;
} else if ny > 1.0 - edge_threshold {
vy = -(ny - (1.0 - edge_threshold)) / edge_threshold;
}
if vx != 0.0 || vy != 0.0 {
let view_w = canvas_rect.width() / self.zoom;
let view_h = canvas_rect.height() / self.zoom;
let speed_w = view_w;
let speed_h = view_h;
self.pan_x += vx * speed_w * dt;
self.pan_y += vy * speed_h * dt;
ctx.request_repaint();
}
}
}
let internal_alpha = (0.3_f32 * 255.0).round() as u8;
let video_scroll_color = egui::Color32::from_rgba_unmultiplied(255, 0, 0, internal_alpha);
let audio_area_color = egui::Color32::from_rgba_unmultiplied(0, 0, 255, internal_alpha);
let anchor_color = egui::Color32::from_rgba_unmultiplied(64, 255, 64, internal_alpha);
let text_color = egui::Color32::from_rgb(255, 255, 255);
if self.text_cache.is_none() {
self.text_cache = Some(crate::text_cache::TextCache::new());
}
let pan_x = self.pan_x;
let pan_y = self.pan_y;
let zoom = self.zoom;
let svg_to_screen = |x: f32, y: f32| -> egui::Pos2 {
egui::pos2(
(x + pan_x) * zoom + canvas_rect.left(),
(y + pan_y) * zoom + canvas_rect.top(),
)
};
let screen_to_svg = |pos: egui::Pos2| -> (f32, f32) {
(
(pos.x - canvas_rect.left()) / zoom - pan_x,
(pos.y - canvas_rect.top()) / zoom - pan_y,
)
};
let mut pending_navigation: Option<(f32, f32, f32, f32)> = None;
let mut rendered_count = 0u32;
if let Some(ref content) = self.svg_content {
let pointer_svg_hover = input.pointer_latest.or(input.pointer_pos).and_then(|p| {
if canvas_rect.contains(p) {
Some(screen_to_svg(p))
} else {
None
}
});
let click_svg_pos = if input.primary_released && !self.is_dragging {
input.pointer_latest.or(input.pointer_pos).and_then(|p| {
if canvas_rect.contains(p) {
Some(screen_to_svg(p))
} else {
None
}
})
} else {
None
};
if let Some((svg_x, svg_y)) = click_svg_pos {
if let Some(link) = content.anchor_links.iter().find(|link| {
svg_x >= link.x
&& svg_x <= link.x + link.width
&& svg_y >= link.y
&& svg_y <= link.y + link.height
}) {
if let Some(anchor) = content.anchors.iter().find(|a| a.id == link.target_id) {
pending_navigation = Some(anchor.bounds());
} else {
log::warn!("Anchor link target not found: {}", link.target_id);
}
}
}
if let Some((svg_x, svg_y)) = pointer_svg_hover {
if content.anchor_links.iter().any(|link| {
svg_x >= link.x
&& svg_x <= link.x + link.width
&& svg_y >= link.y
&& svg_y <= link.y + link.height
}) {
ctx.output_mut(|o| o.cursor_icon = egui::CursorIcon::PointingHand);
}
}
if self.render_internal_areas {
let mut hovered_descs: Vec<String> = Vec::new();
let pointer_svg = input.pointer_pos.map(screen_to_svg);
for vs in &content.video_scrolls {
let (x, y, w, h) = vs.bounds();
let rect =
egui::Rect::from_min_max(svg_to_screen(x, y), svg_to_screen(x + w, y + h));
if rect.intersects(canvas_rect) {
painter.rect_filled(rect, 0.0, video_scroll_color);
rendered_count += 1;
}
if let Some((svg_x, svg_y)) = pointer_svg {
if svg_x >= x && svg_x <= x + w && svg_y >= y && svg_y <= y + h {
hovered_descs.push(format!("Video: {}", vs.desc));
}
}
}
for aa in &content.audio_areas {
let center = svg_to_screen(aa.cx, aa.cy);
let radius = aa.radius * zoom;
let rect = egui::Rect::from_min_max(
egui::pos2(center.x - radius, center.y - radius),
egui::pos2(center.x + radius, center.y + radius),
);
if rect.intersects(canvas_rect) {
painter.circle_filled(center, radius, audio_area_color);
rendered_count += 1;
}
if let Some((svg_x, svg_y)) = pointer_svg {
let dx = svg_x - aa.cx;
let dy = svg_y - aa.cy;
if dx * dx + dy * dy <= aa.radius * aa.radius {
hovered_descs.push(format!("Audio: {}", aa.desc));
}
}
}
for anchor in &content.anchors {
let (x, y, w, h) = anchor.bounds();
let rect =
egui::Rect::from_min_max(svg_to_screen(x, y), svg_to_screen(x + w, y + h));
if rect.intersects(canvas_rect) {
painter.rect_filled(rect, 0.0, anchor_color);
rendered_count += 1;
}
if let Some((svg_x, svg_y)) = pointer_svg {
if svg_x >= x && svg_x <= x + w && svg_y >= y && svg_y <= y + h {
hovered_descs.push(format!("Anchor: {}", anchor.id));
}
}
}
if !hovered_descs.is_empty() {
egui::Tooltip::always_open(
ctx.clone(),
ui.layer_id(),
egui::Id::new("internal-area-desc"),
egui::PopupAnchor::Pointer,
)
.gap(12.0)
.show(|ui| {
for desc in hovered_descs {
ui.label(desc);
}
});
}
}
let text_cache = self.text_cache.as_mut().expect("just initialized");
for text_elem in &content.texts {
let (x, y, w, h) = text_elem.bounds();
let rect =
egui::Rect::from_min_max(svg_to_screen(x, y), svg_to_screen(x + w, y + h));
if !rect.intersects(canvas_rect) {
continue;
}
let display_font_size = text_elem.font_size * zoom;
if display_font_size >= 0.5 {
for line in &text_elem.lines {
if line.content.trim().is_empty() {
continue;
}
let cached =
text_cache.get_or_create(ctx, &line.content, text_elem.font_size, zoom);
let scale_factor = zoom / cached.render_scale;
let display_width = cached.width as f32 * scale_factor;
let display_height = cached.height as f32 * scale_factor;
let y_adjusted = line.y - text_elem.font_size * 0.8;
let pos = svg_to_screen(line.x, y_adjusted);
painter.image(
cached.texture.id(),
egui::Rect::from_min_size(
pos,
egui::vec2(display_width, display_height),
),
egui::Rect::from_min_max(egui::pos2(0.0, 0.0), egui::pos2(1.0, 1.0)),
text_color,
);
}
}
rendered_count += 1;
}
}
if let Some(rect) = pending_navigation {
self.request_view_to_rect(rect, &canvas_rect, Self::NAV_DURATION);
}
rendered_count
}
}

4
src/lib.rs
View file

@ -1,7 +1,7 @@
#![warn(clippy::all, rust_2018_idioms)] #![warn(clippy::all)]
mod app; mod app;
pub mod svg; pub mod svg;
mod text_cache; mod text_cache;
pub use app::TemplateApp; pub use app::LasApp;

4
src/main.rs
View file

@ -26,7 +26,7 @@ fn main() -> eframe::Result {
eframe::run_native( eframe::run_native(
"Line and Surface", "Line and Surface",
native_options, native_options,
Box::new(|cc| Ok(Box::new(las::TemplateApp::new(cc)))), Box::new(|cc| Ok(Box::new(las::LasApp::new(cc)))),
) )
} }
@ -56,7 +56,7 @@ fn main() {
.start( .start(
canvas, canvas,
web_options, web_options,
Box::new(|cc| Ok(Box::new(las::TemplateApp::new(cc)))), Box::new(|cc| Ok(Box::new(las::LasApp::new(cc)))),
) )
.await; .await;

29
src/svg/color.rs Normal file
View file

@ -0,0 +1,29 @@
pub(super) fn parse_background_color(style: &str) -> Option<[u8; 3]> {
for entry in style.split(';') {
let entry = entry.trim();
if let Some(value) = entry.strip_prefix("background-color:") {
let value = value.trim();
return parse_hex_color(value);
}
}
None
}
fn parse_hex_color(value: &str) -> Option<[u8; 3]> {
let hex = value.strip_prefix('#')?.trim();
match hex.len() {
3 => {
let r = u8::from_str_radix(&hex[0..1].repeat(2), 16).ok()?;
let g = u8::from_str_radix(&hex[1..2].repeat(2), 16).ok()?;
let b = u8::from_str_radix(&hex[2..3].repeat(2), 16).ok()?;
Some([r, g, b])
}
6 => {
let r = u8::from_str_radix(&hex[0..2], 16).ok()?;
let g = u8::from_str_radix(&hex[2..4], 16).ok()?;
let b = u8::from_str_radix(&hex[4..6], 16).ok()?;
Some([r, g, b])
}
_ => None,
}
}

12
src/svg/mod.rs Normal file
View file

@ -0,0 +1,12 @@
//! SVG parsing module for extracting special elements from SVG files.
mod color;
mod parser;
mod types;
#[cfg(test)]
mod tests;
pub use types::{
Anchor, AnchorLink, AudioArea, Renderable, SvgContent, TextElement, TextLine, VideoScroll,
};

258
src/svg.rs → src/svg/parser.rs
View file

@ -1,133 +1,10 @@
//! SVG parsing module for extracting special elements from SVG files. use super::Renderable as _;
use super::color::parse_background_color;
use quick_xml::events::Event; use super::types::{Anchor, AnchorLink, AudioArea, SvgContent, TextElement, TextLine, VideoScroll};
use quick_xml::Reader; use quick_xml::Reader;
use quick_xml::events::Event;
use std::fs; use std::fs;
/// Trait for elements that can be rendered with a bounding box.
pub trait Renderable {
/// Returns the bounding box: (x, y, width, height) in SVG coordinates.
fn bounds(&self) -> (f32, f32, f32, f32);
}
/// An `<image>` element with a `<desc>` child (video scroll area).
#[derive(Debug, Clone)]
pub struct VideoScroll {
pub x: f32,
pub y: f32,
pub width: f32,
pub height: f32,
pub desc: String,
}
impl Renderable for VideoScroll {
fn bounds(&self) -> (f32, f32, f32, f32) {
(self.x, self.y, self.width, self.height)
}
}
/// A `<circle>` or `<ellipse>` element with a `<desc>` child (audio area).
#[derive(Debug, Clone)]
pub struct AudioArea {
pub cx: f32,
pub cy: f32,
pub radius: f32,
pub desc: String,
}
impl Renderable for AudioArea {
fn bounds(&self) -> (f32, f32, f32, f32) {
(
self.cx - self.radius,
self.cy - self.radius,
self.radius * 2.0,
self.radius * 2.0,
)
}
}
/// A `<rect>` element with id starting with "anchor".
#[derive(Debug, Clone)]
pub struct Anchor {
pub id: String,
pub x: f32,
pub y: f32,
pub width: f32,
pub height: f32,
}
impl Renderable for Anchor {
fn bounds(&self) -> (f32, f32, f32, f32) {
(self.x, self.y, self.width, self.height)
}
}
/// A single line of text (tspan).
#[derive(Debug, Clone)]
pub struct TextLine {
pub x: f32,
pub y: f32,
pub content: String,
}
/// A `<text>` element with multiple lines.
#[derive(Debug, Clone)]
pub struct TextElement {
pub lines: Vec<TextLine>,
pub font_size: f32, // Parsed from style attribute
}
/// A hyperlink pointing to an anchor by id.
#[derive(Debug, Clone)]
pub struct AnchorLink {
pub target_id: String,
pub x: f32,
pub y: f32,
pub width: f32,
pub height: f32,
}
impl Renderable for TextElement {
fn bounds(&self) -> (f32, f32, f32, f32) {
if self.lines.is_empty() {
return (0.0, 0.0, 0.0, 0.0);
}
let min_x = self.lines.iter().map(|l| l.x).fold(f32::INFINITY, f32::min);
let min_y = self
.lines
.iter()
.map(|l| l.y - self.font_size)
.fold(f32::INFINITY, f32::min);
let max_x = self
.lines
.iter()
.map(|l| l.x + l.content.len() as f32 * self.font_size * 0.6)
.fold(f32::NEG_INFINITY, f32::max);
let max_y = self
.lines
.iter()
.map(|l| l.y)
.fold(f32::NEG_INFINITY, f32::max);
(min_x, min_y, max_x - min_x, max_y - min_y)
}
}
/// Container for all parsed SVG content.
#[derive(Debug, Clone, Default)]
pub struct SvgContent {
pub video_scrolls: Vec<VideoScroll>,
pub audio_areas: Vec<AudioArea>,
pub anchors: Vec<Anchor>,
pub anchor_links: Vec<AnchorLink>,
pub texts: Vec<TextElement>,
pub viewbox: Option<(f32, f32, f32, f32)>, // (min_x, min_y, width, height)
pub background_color: Option<[u8; 3]>,
pub start_rect: Option<(f32, f32, f32, f32)>,
}
/// State for tracking current element during parsing. /// State for tracking current element during parsing.
#[derive(Debug, Clone)] #[derive(Debug, Clone)]
enum PendingElement { enum PendingElement {
@ -246,7 +123,7 @@ impl SvgContent {
let cleaned = value.trim_start_matches('#'); let cleaned = value.trim_start_matches('#');
if cleaned.starts_with("anchor") { if cleaned.starts_with("anchor") {
current_link = current_link =
Some(LinkAccumulator::new(cleaned.to_string())); Some(LinkAccumulator::new(cleaned.to_owned()));
} }
} }
} }
@ -598,128 +475,3 @@ impl SvgContent {
Ok(svg_content) Ok(svg_content)
} }
} }
fn parse_background_color(style: &str) -> Option<[u8; 3]> {
for entry in style.split(';') {
let entry = entry.trim();
if let Some(value) = entry.strip_prefix("background-color:") {
let value = value.trim();
return parse_hex_color(value);
}
}
None
}
fn parse_hex_color(value: &str) -> Option<[u8; 3]> {
let hex = value.strip_prefix('#')?.trim();
match hex.len() {
3 => {
let r = u8::from_str_radix(&hex[0..1].repeat(2), 16).ok()?;
let g = u8::from_str_radix(&hex[1..2].repeat(2), 16).ok()?;
let b = u8::from_str_radix(&hex[2..3].repeat(2), 16).ok()?;
Some([r, g, b])
}
6 => {
let r = u8::from_str_radix(&hex[0..2], 16).ok()?;
let g = u8::from_str_radix(&hex[2..4], 16).ok()?;
let b = u8::from_str_radix(&hex[4..6], 16).ok()?;
Some([r, g, b])
}
_ => None,
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_parse_video_scroll() {
let svg = r#"
<svg viewBox="0 0 1000 1000">
<image x="100" y="200" width="300" height="400">
<desc>horizontal video.mp4</desc>
</image>
</svg>
"#;
let content = SvgContent::parse(svg).expect("Failed to parse SVG");
assert_eq!(content.video_scrolls.len(), 1);
let vs = &content.video_scrolls[0];
assert_eq!(vs.x, 100.0);
assert_eq!(vs.y, 200.0);
assert_eq!(vs.width, 300.0);
assert_eq!(vs.height, 400.0);
assert_eq!(vs.desc, "horizontal video.mp4");
}
#[test]
fn test_parse_audio_area_circle() {
let svg = r#"
<svg viewBox="0 0 1000 1000">
<circle cx="500" cy="500" r="100">
<desc>ambient.mp3</desc>
</circle>
</svg>
"#;
let content = SvgContent::parse(svg).expect("Failed to parse SVG");
assert_eq!(content.audio_areas.len(), 1);
let aa = &content.audio_areas[0];
assert_eq!(aa.cx, 500.0);
assert_eq!(aa.cy, 500.0);
assert_eq!(aa.radius, 100.0);
let (x, y, w, h) = aa.bounds();
assert_eq!(x, 400.0);
assert_eq!(y, 400.0);
assert_eq!(w, 200.0);
assert_eq!(h, 200.0);
}
#[test]
fn test_parse_anchor() {
let svg = r#"
<svg viewBox="0 0 1000 1000">
<rect id="anchor-home" x="10" y="20" width="30" height="40" />
</svg>
"#;
let content = SvgContent::parse(svg).expect("Failed to parse SVG");
assert_eq!(content.anchors.len(), 1);
let anchor = &content.anchors[0];
assert_eq!(anchor.id, "anchor-home");
assert_eq!(anchor.x, 10.0);
assert_eq!(anchor.y, 20.0);
}
#[test]
fn test_parse_text() {
let svg = r#"
<svg viewBox="0 0 1000 1000">
<text x="100" y="200" style="font-size:12px">
<tspan x="100" y="200">Hello World</tspan>
<tspan x="100" y="220">Second Line</tspan>
</text>
</svg>
"#;
let content = SvgContent::parse(svg).expect("Failed to parse SVG");
assert_eq!(content.texts.len(), 1);
let text = &content.texts[0];
assert_eq!(text.lines.len(), 2);
assert_eq!(text.lines[0].x, 100.0);
assert_eq!(text.lines[0].y, 200.0);
assert_eq!(text.lines[0].content, "Hello World");
assert_eq!(text.lines[1].content, "Second Line");
assert_eq!(text.font_size, 12.0);
}
#[test]
fn test_viewbox() {
let svg = r#"<svg viewBox="0 0 1920 1080"></svg>"#;
let content = SvgContent::parse(svg).expect("Failed to parse SVG");
assert_eq!(content.viewbox, Some((0.0, 0.0, 1920.0, 1080.0)));
}
}

91
src/svg/tests.rs Normal file
View file

@ -0,0 +1,91 @@
use super::{Renderable, SvgContent};
#[test]
fn test_parse_video_scroll() {
let svg = r#"
<svg viewBox="0 0 1000 1000">
<image x="100" y="200" width="300" height="400">
<desc>horizontal video.mp4</desc>
</image>
</svg>
"#;
let content = SvgContent::parse(svg).expect("Failed to parse SVG");
assert_eq!(content.video_scrolls.len(), 1);
let vs = &content.video_scrolls[0];
assert_eq!(vs.x, 100.0);
assert_eq!(vs.y, 200.0);
assert_eq!(vs.width, 300.0);
assert_eq!(vs.height, 400.0);
assert_eq!(vs.desc, "horizontal video.mp4");
}
#[test]
fn test_parse_audio_area_circle() {
let svg = r#"
<svg viewBox="0 0 1000 1000">
<circle cx="500" cy="500" r="100">
<desc>ambient.mp3</desc>
</circle>
</svg>
"#;
let content = SvgContent::parse(svg).expect("Failed to parse SVG");
assert_eq!(content.audio_areas.len(), 1);
let aa = &content.audio_areas[0];
assert_eq!(aa.cx, 500.0);
assert_eq!(aa.cy, 500.0);
assert_eq!(aa.radius, 100.0);
let (x, y, w, h) = aa.bounds();
assert_eq!(x, 400.0);
assert_eq!(y, 400.0);
assert_eq!(w, 200.0);
assert_eq!(h, 200.0);
}
#[test]
fn test_parse_anchor() {
let svg = r#"
<svg viewBox="0 0 1000 1000">
<rect id="anchor-home" x="10" y="20" width="30" height="40" />
</svg>
"#;
let content = SvgContent::parse(svg).expect("Failed to parse SVG");
assert_eq!(content.anchors.len(), 1);
let anchor = &content.anchors[0];
assert_eq!(anchor.id, "anchor-home");
assert_eq!(anchor.x, 10.0);
assert_eq!(anchor.y, 20.0);
}
#[test]
fn test_parse_text() {
let svg = r#"
<svg viewBox="0 0 1000 1000">
<text x="100" y="200" style="font-size:12px">
<tspan x="100" y="200">Hello World</tspan>
<tspan x="100" y="220">Second Line</tspan>
</text>
</svg>
"#;
let content = SvgContent::parse(svg).expect("Failed to parse SVG");
assert_eq!(content.texts.len(), 1);
let text = &content.texts[0];
assert_eq!(text.lines.len(), 2);
assert_eq!(text.lines[0].x, 100.0);
assert_eq!(text.lines[0].y, 200.0);
assert_eq!(text.lines[0].content, "Hello World");
assert_eq!(text.lines[1].content, "Second Line");
assert_eq!(text.font_size, 12.0);
}
#[test]
fn test_viewbox() {
let svg = r#"<svg viewBox="0 0 1920 1080"></svg>"#;
let content = SvgContent::parse(svg).expect("Failed to parse SVG");
assert_eq!(content.viewbox, Some((0.0, 0.0, 1920.0, 1080.0)));
}

123
src/svg/types.rs Normal file
View file

@ -0,0 +1,123 @@
/// Trait for elements that can be rendered with a bounding box.
pub trait Renderable {
/// Returns the bounding box: (x, y, width, height) in SVG coordinates.
fn bounds(&self) -> (f32, f32, f32, f32);
}
/// An `<image>` element with a `<desc>` child (video scroll area).
#[derive(Debug, Clone)]
pub struct VideoScroll {
pub x: f32,
pub y: f32,
pub width: f32,
pub height: f32,
pub desc: String,
}
impl Renderable for VideoScroll {
fn bounds(&self) -> (f32, f32, f32, f32) {
(self.x, self.y, self.width, self.height)
}
}
/// A `<circle>` or `<ellipse>` element with a `<desc>` child (audio area).
#[derive(Debug, Clone)]
pub struct AudioArea {
pub cx: f32,
pub cy: f32,
pub radius: f32,
pub desc: String,
}
impl Renderable for AudioArea {
fn bounds(&self) -> (f32, f32, f32, f32) {
(
self.cx - self.radius,
self.cy - self.radius,
self.radius * 2.0,
self.radius * 2.0,
)
}
}
/// A `<rect>` element with id starting with "anchor".
#[derive(Debug, Clone)]
pub struct Anchor {
pub id: String,
pub x: f32,
pub y: f32,
pub width: f32,
pub height: f32,
}
impl Renderable for Anchor {
fn bounds(&self) -> (f32, f32, f32, f32) {
(self.x, self.y, self.width, self.height)
}
}
/// A single line of text (tspan).
#[derive(Debug, Clone)]
pub struct TextLine {
pub x: f32,
pub y: f32,
pub content: String,
}
/// A `<text>` element with multiple lines.
#[derive(Debug, Clone)]
pub struct TextElement {
pub lines: Vec<TextLine>,
pub font_size: f32, // Parsed from style attribute
}
/// A hyperlink pointing to an anchor by id.
#[derive(Debug, Clone)]
pub struct AnchorLink {
pub target_id: String,
pub x: f32,
pub y: f32,
pub width: f32,
pub height: f32,
}
impl Renderable for TextElement {
fn bounds(&self) -> (f32, f32, f32, f32) {
if self.lines.is_empty() {
return (0.0, 0.0, 0.0, 0.0);
}
let min_x = self.lines.iter().map(|l| l.x).fold(f32::INFINITY, f32::min);
let min_y = self
.lines
.iter()
.map(|l| l.y - self.font_size)
.fold(f32::INFINITY, f32::min);
let max_x = self
.lines
.iter()
.map(|l| l.x + l.content.len() as f32 * self.font_size * 0.6)
.fold(f32::NEG_INFINITY, f32::max);
let max_y = self
.lines
.iter()
.map(|l| l.y)
.fold(f32::NEG_INFINITY, f32::max);
(min_x, min_y, max_x - min_x, max_y - min_y)
}
}
/// Container for all parsed SVG content.
#[derive(Debug, Clone, Default)]
pub struct SvgContent {
pub video_scrolls: Vec<VideoScroll>,
pub audio_areas: Vec<AudioArea>,
pub anchors: Vec<Anchor>,
pub anchor_links: Vec<AnchorLink>,
pub texts: Vec<TextElement>,
pub viewbox: Option<(f32, f32, f32, f32)>, // (min_x, min_y, width, height)
pub background_color: Option<[u8; 3]>,
pub start_rect: Option<(f32, f32, f32, f32)>,
}

1
src/text_cache.rs
View file

@ -184,6 +184,7 @@ impl TextCache {
} }
/// Render text to a texture at high resolution. /// Render text to a texture at high resolution.
#[expect(clippy::too_many_lines)]
fn render_text( fn render_text(
&self, &self,
ctx: &egui::Context, ctx: &egui::Context,