feat: add keyboard shortcuts for pan/zoom/iterations/AA
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
This commit is contained in:
Claude Sonnet 5
+109
-5
@@ -1285,8 +1285,8 @@ impl FractalApp {
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self.info_open = open;
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}
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/// Help window: what the app does, plus a reference for mouse/touch
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/// controls (there are no in-app keyboard shortcuts today).
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/// Help window: what the app does, plus a reference for mouse/touch and
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/// keyboard controls.
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fn help_window(&mut self, ctx: &egui::Context) {
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let mut open = self.help_open;
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egui::Window::new("Help")
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@@ -1340,10 +1340,36 @@ impl FractalApp {
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ui.separator();
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ui.heading("Keyboard");
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egui::Grid::new("help_keyboard_grid")
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.num_columns(2)
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.spacing([12.0, 6.0])
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.show(ui, |ui| {
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ui.label("Arrow keys");
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ui.label("Pan the view");
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ui.end_row();
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ui.label("Z / S");
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ui.label("Zoom in / out toward the center");
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ui.end_row();
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ui.label("+ / -");
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ui.label("Increase / decrease iterations");
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ui.end_row();
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ui.label("R");
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ui.label("Reset to the default view");
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ui.end_row();
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ui.label("H");
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ui.label("Toggle this Help window");
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ui.end_row();
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ui.label("I");
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ui.label("Toggle the Info window");
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ui.end_row();
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ui.label("A");
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ui.label("Toggle antialiasing (2×2)");
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ui.end_row();
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});
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ui.label(
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"The view is driven entirely by mouse/touch — there are no \
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in-app keyboard shortcuts. Esc / F11 toggle fullscreen via \
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the browser or OS, as usual.",
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"Shortcuts are ignored while a text field (e.g. the center/zoom \
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edit boxes) has focus. Esc / F11 toggle fullscreen via the \
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browser or OS, as usual.",
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);
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ui.separator();
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@@ -1976,6 +2002,84 @@ impl FractalApp {
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ui.ctx().request_repaint();
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}
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// Keyboard: arrows pan, z/s zoom in/out, +/- adjust iterations, R
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// resets the view, H/I toggle the Help/Info windows. Skipped while a
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// text field (e.g. the center/zoom edit boxes) has focus.
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if !ui.ctx().egui_wants_keyboard_input() {
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let dt = ui.input(|i| i.stable_dt as f64).clamp(0.0, 0.1);
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let (left, right, up, down, zoom_in, zoom_out) = ui.input(|i| {
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(
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i.key_down(egui::Key::ArrowLeft),
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i.key_down(egui::Key::ArrowRight),
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i.key_down(egui::Key::ArrowUp),
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i.key_down(egui::Key::ArrowDown),
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i.key_down(egui::Key::Z),
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i.key_down(egui::Key::S),
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)
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});
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// Pixels/sec pan speed — matches a brisk mouse drag regardless of
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// frame rate. See `pan_pixels`'s screen-space (+x right, +y down)
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// convention: Right/Down pan the *camera* right/down, which is
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// the opposite delta sign from a drag that would show the same
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// content (a drag grabs the canvas; these keys move the camera).
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const PAN_SPEED_PX: f64 = 700.0;
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let mut dx = 0.0;
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let mut dy = 0.0;
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if left {
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dx += PAN_SPEED_PX * dt;
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}
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if right {
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dx -= PAN_SPEED_PX * dt;
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}
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if down {
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dy += PAN_SPEED_PX * dt;
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}
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if up {
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dy -= PAN_SPEED_PX * dt;
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}
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if dx != 0.0 || dy != 0.0 {
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self.view.pan_pixels(dx, dy, height_px);
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interacted = true;
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}
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// e-folds/sec, same scale as the auto-zoom animation.
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const ZOOM_SPEED: f64 = 1.0;
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if zoom_in != zoom_out {
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let rate = if zoom_in { ZOOM_SPEED } else { -ZOOM_SPEED };
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let factor = (-rate * dt).exp();
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self.view.zoom_at_pixel(0.0, 0.0, height_px, factor);
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interacted = true;
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}
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if left || right || up || down || zoom_in || zoom_out {
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ui.ctx().request_repaint();
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}
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if ui.input(|i| i.key_pressed(egui::Key::R)) {
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self.view = Self::default_view_for(self.mode, self.kind);
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interacted = true;
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}
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if ui.input(|i| i.key_pressed(egui::Key::H)) {
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self.help_open = !self.help_open;
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}
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if ui.input(|i| i.key_pressed(egui::Key::I)) {
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self.info_open = !self.info_open;
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}
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if ui.input(|i| i.key_pressed(egui::Key::A)) {
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self.antialias = !self.antialias;
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}
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if ui.input(|i| i.key_pressed(egui::Key::Plus) || i.key_pressed(egui::Key::Equals)) {
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self.auto_iterations = false;
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self.max_iterations = ((self.max_iterations as f64 * 1.25).round() as u32)
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.clamp(32, MAX_REF_POINTS as u32 - 1);
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}
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if ui.input(|i| i.key_pressed(egui::Key::Minus)) {
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self.auto_iterations = false;
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self.max_iterations = ((self.max_iterations as f64 / 1.25).round() as u32)
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.clamp(32, MAX_REF_POINTS as u32 - 1);
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}
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}
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if self.buddhabrot {
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// No reference orbit / perturbation machinery: iterate directly in
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// f32 from the live view. Progressive accumulation means this
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