add demo for allow_auto_bounds

crates/egui_demo_lib/src/demo/plot_demo.rs

@@ -5,8 +5,8 @@ use egui::*;
 
 use egui::plot::{
  Arrows, AxisBools, AxisHints, Bar, BarChart, BoxElem, BoxPlot, BoxSpread, CoordinatesFormatter,
- Corner, GridInput, GridMark, HLine, Legend, Line, LineStyle, MarkerShape, Plot, PlotImage,
- PlotPoint, PlotPoints, PlotResponse, Points, Polygon, Text, VLine,
+ Corner, GridInput, GridMark, HLine, Legend, Line, LineStyle, MarkerShape, Plot, PlotBounds,
+ PlotImage, PlotPoint, PlotPoints, PlotResponse, PlotUi, Points, Polygon, Text, VLine,
 };
 
 // ----------------------------------------------------------------------------
@@ -21,6 +21,7 @@ enum Panel {
  Interaction,
  CustomAxes,
  LinkedAxes,
+ DrawBasic,
 }
 
 impl Default for Panel {
@@ -41,6 +42,7 @@ pub struct PlotDemo {
  interaction_demo: InteractionDemo,
  custom_axes_demo: CustomAxesDemo,
  linked_axes_demo: LinkedAxesDemo,
+ painting_demo: PaintingDemo,
  open_panel: Panel,
 }
 
@@ -87,6 +89,7 @@ impl super::View for PlotDemo {
  ui.selectable_value(&mut self.open_panel, Panel::Interaction, "Interaction");
  ui.selectable_value(&mut self.open_panel, Panel::CustomAxes, "Custom Axes");
  ui.selectable_value(&mut self.open_panel, Panel::LinkedAxes, "Linked Axes");
+ ui.selectable_value(&mut self.open_panel, Panel::DrawBasic, "Painting");
  });
  ui.separator();
 
@@ -115,6 +118,9 @@ impl super::View for PlotDemo {
  Panel::LinkedAxes => {
  self.linked_axes_demo.ui(ui);
  }
+ Panel::DrawBasic => {
+ self.painting_demo.ui(ui);
+ }
  }
  }
 }
@@ -1032,3 +1038,65 @@ fn is_approx_zero(val: f64) -> bool {
 fn is_approx_integer(val: f64) -> bool {
  val.fract().abs() < 1e-6
 }
+
+#[derive(PartialEq, Default)]
+
+struct PaintingDemo {
+ points: Vec<Vec<[f64; 2]>>,
+}
+
+impl PaintingDemo {
+ fn ui(&mut self, ui: &mut Ui) -> Response {
+ //ui.horizontal(|ui| {});
+ self.ui_content(ui)
+ }
+ pub fn ui_content(&mut self, ui: &mut egui::Ui) -> egui::Response {
+ let is_key_space_down = ui.ctx().input(|i| i.key_down(Key::Space));
+ let plot = egui::plot::Plot::new("example_plot")
+ .allow_drag(is_key_space_down)
+ .data_aspect(1.0)
+ .allow_boxed_zoom(is_key_space_down)
+ .allow_double_click_reset(is_key_space_down)
+ .allow_auto_bounds(false)
+ .legend(egui::plot::Legend::default())
+ .show(ui, |plot_ui| {
+ plot_ui.plot_bounds();
+ plot_ui.set_plot_bounds(PlotBounds::from_min_max([0.0, -1.0], [6.0, 3.0]));
+ if self.points.is_empty() {
+ self.points.push(Vec::new());
+ }
+ let interact_pos = plot_ui.ctx().input(|i| i.pointer.interact_pos());
+ let down = plot_ui.ctx().input(|i| i.pointer.primary_down());
+
+ let lines = self.points.last_mut();
+ let point_coord = plot_ui.pointer_coordinate();
+ if lines.is_some() && point_coord.is_some() && interact_pos.is_some() {
+ let current_line = lines.unwrap();
+ if !plot_ui.response().clicked() && down {
+ let canvas_pos = plot_ui.pointer_coordinate().unwrap();
+ let canvas_pos = [canvas_pos.x, canvas_pos.y];
+
+ if current_line.last() != Some(&canvas_pos) {
+ current_line.push(canvas_pos);
+ }
+ } else if !current_line.is_empty() {
+ self.points.push(vec![]);
+ }
+ }
+ self.render(plot_ui, &self.points);
+ });
+ plot.response
+ }
+
+ fn render(&self, plot_ui: &mut PlotUi, vec_tool: &Vec<Vec<[f64; 2]>>) {
+ for points in vec_tool.iter() {
+ if points.len() >= 2 {
+ plot_ui.line(
+ Line::new(PlotPoints::from(points.clone()))
+ .color(Color32::from_rgb(100, 150, 250))
+ .name("Line"),
+ );
+ }
+ }
+ }
+}