7dad76b913
egui reexports the `epaint` crate both under its original name and under the alias `paint` (for historical reasons)
69 lines
2.1 KiB
Rust
69 lines
2.1 KiB
Rust
use egui::{containers::*, *};
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#[cfg_attr(feature = "persistence", derive(serde::Deserialize, serde::Serialize))]
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#[cfg_attr(feature = "persistence", serde(default))]
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pub struct DancingStrings {}
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impl Default for DancingStrings {
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fn default() -> Self {
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Self {}
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}
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}
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impl super::Demo for DancingStrings {
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fn name(&self) -> &str {
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"♫ Dancing Strings"
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}
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fn show(&mut self, ctx: &CtxRef, open: &mut bool) {
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use super::View;
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Window::new(self.name())
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.open(open)
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.default_size(vec2(512.0, 256.0))
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.scroll(false)
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.show(ctx, |ui| self.ui(ui));
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}
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}
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impl super::View for DancingStrings {
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fn ui(&mut self, ui: &mut Ui) {
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Frame::dark_canvas(ui.style()).show(ui, |ui| {
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ui.ctx().request_repaint();
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let time = ui.input().time;
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let desired_size = ui.available_width() * vec2(1.0, 0.35);
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let (_id, rect) = ui.allocate_space(desired_size);
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let to_screen =
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emath::RectTransform::from_to(Rect::from_x_y_ranges(0.0..=1.0, -1.0..=1.0), rect);
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let mut shapes = vec![];
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for &mode in &[2, 3, 5] {
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let mode = mode as f32;
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let n = 120;
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let speed = 1.5;
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let points: Vec<Pos2> = (0..=n)
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.map(|i| {
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let t = i as f32 / (n as f32);
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let amp = (time as f32 * speed * mode).sin() / mode;
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let y = amp * (t * std::f32::consts::TAU / 2.0 * mode).sin();
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to_screen * pos2(t, y)
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})
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.collect();
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let thickness = 10.0 / mode;
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shapes.push(epaint::Shape::line(
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points,
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Stroke::new(thickness, Color32::from_additive_luminance(196)),
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));
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}
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ui.painter().extend(shapes);
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});
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ui.vertical_centered(|ui| {
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ui.add(crate::__egui_github_link_file!());
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});
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}
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}
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