105b999cb6
* First pass (missing rendering the bar) * Render horizontal bars, and change Window scroll API * emath: add impl Index + IndexMut for Align2 * Scrolling: fix subtle sizing bugs * Add horizontal scrolling to color test * try to wrap content before showing scrollbars, + add auto-shrink option * Add hscroll to the misc demo window * Fix for putting wrapping labels in an infinitely wide layout * Add a egui_asserts to protect against nans in the layout engine * Add line about horizontal scrolling to changelog * Add example to docs of ScrollArea * code cleanup
98 lines
2.8 KiB
Rust
98 lines
2.8 KiB
Rust
use egui::*;
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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 Painting {
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/// in 0-1 normalized coordinates
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lines: Vec<Vec<Pos2>>,
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stroke: Stroke,
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}
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impl Default for Painting {
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fn default() -> Self {
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Self {
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lines: Default::default(),
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stroke: Stroke::new(1.0, Color32::LIGHT_BLUE),
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}
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}
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}
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impl Painting {
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pub fn ui_control(&mut self, ui: &mut egui::Ui) -> egui::Response {
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ui.horizontal(|ui| {
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egui::stroke_ui(ui, &mut self.stroke, "Stroke");
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ui.separator();
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if ui.button("Clear Painting").clicked() {
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self.lines.clear();
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}
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})
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.response
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}
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pub fn ui_content(&mut self, ui: &mut Ui) -> egui::Response {
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let (mut response, painter) =
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ui.allocate_painter(ui.available_size_before_wrap_finite(), Sense::drag());
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let to_screen = emath::RectTransform::from_to(
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Rect::from_min_size(Pos2::ZERO, response.rect.square_proportions()),
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response.rect,
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);
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let from_screen = to_screen.inverse();
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if self.lines.is_empty() {
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self.lines.push(vec![]);
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}
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let current_line = self.lines.last_mut().unwrap();
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if let Some(pointer_pos) = response.interact_pointer_pos() {
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let canvas_pos = from_screen * pointer_pos;
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if current_line.last() != Some(&canvas_pos) {
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current_line.push(canvas_pos);
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response.mark_changed();
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}
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} else if !current_line.is_empty() {
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self.lines.push(vec![]);
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response.mark_changed();
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}
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let mut shapes = vec![];
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for line in &self.lines {
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if line.len() >= 2 {
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let points: Vec<Pos2> = line.iter().map(|p| to_screen * *p).collect();
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shapes.push(egui::Shape::line(points, self.stroke));
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}
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}
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painter.extend(shapes);
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response
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}
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}
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impl super::Demo for Painting {
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fn name(&self) -> &'static str {
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"🖊 Painting"
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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, 512.0))
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.vscroll(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 Painting {
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fn ui(&mut self, ui: &mut Ui) {
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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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self.ui_control(ui);
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ui.label("Paint with your mouse/touch!");
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Frame::dark_canvas(ui.style()).show(ui, |ui| {
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self.ui_content(ui);
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});
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}
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}
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