Prepare view switch

src/global_state.rs

@@ -1,8 +1,20 @@
 use bevy::prelude::*;
 
-#[derive(Resource, Default, Debug, PartialEq, Clone, Copy)]
+#[derive(Resource, Debug, PartialEq, Clone, Copy)]
 pub struct GlobalState {
     pub cursor_position: Vec2,
     pub window_extent: Vec2,
     pub polygon_started: bool,
+    pub view_2d: bool,
+}
+
+impl Default for GlobalState {
+    fn default() -> Self {
+        Self {
+            cursor_position: Vec2::default(),
+            window_extent: Vec2::default(),
+            polygon_started: false,
+            view_2d: true,
+        }
+    }
 }

src/main.rs

@@ -31,16 +31,44 @@ fn setup_camera(mut cmd: Commands) {
 }
 
 // Create UI
-fn update_ui_side_panel(mut contexts: EguiContexts, mut global_state: ResMut<GlobalState>) {
-    egui::Window::new("Hello").show(contexts.ctx_mut(), |ui| {
-        if global_state.polygon_started {
-            // TODO
-        } else {
-            if ui.button("New Polygon").clicked() {
-                global_state.polygon_started = true;
+fn update_ui_side_panel(
+    mut contexts: EguiContexts,
+    mut global_state: ResMut<GlobalState>,
+    mut object_infos: ResMut<ObjectInfos>,
+) {
+    egui::SidePanel::right("2D View")
+        .default_width(400.0)
+        .show(contexts.ctx_mut(), |ui| {
+            if global_state.view_2d {
+                if ui.button("Change to 3D View").clicked() {
+                    global_state.view_2d = false;
+
+                    object_infos
+                        .iter_mut()
+                        .for_each(|polygon| polygon.swap_to_3d());
+                }
+            } else {
+                if ui.button("Change to 2D View").clicked() {
+                    global_state.view_2d = true;
+
+                    object_infos
+                        .iter_mut()
+                        .for_each(|polygon| polygon.swap_to_2d());
+                }
             }
-        }
-    });
+
+            if global_state.polygon_started {
+                if let Some(polygon) = object_infos.active_polygon() {
+                    for (index, point) in polygon.points().iter().enumerate() {
+                        ui.label(&format!("{}: ({}, {})", index, point.x, point.y));
+                    }
+                }
+            } else {
+                if ui.button("New Polygon").clicked() {
+                    global_state.polygon_started = true;
+                }
+            }
+        });
 }
 
 /// Handles all mouse events

src/polygon.rs

@@ -1,3 +1,5 @@
+use std::slice::IterMut;
+
 use bevy::{
     prelude::*,
     render::{mesh::Indices, render_resource::PrimitiveTopology},
@@ -33,15 +35,56 @@ impl Default for PolygonState {
     }
 }
 
+#[derive(Debug, PartialEq)]
+enum PolygonView {
+    TwoDimensional(PolygonState),
+    ThreeDimensional(Entity),
+}
+
+impl PolygonView {
+    fn is_2d(&self) -> bool {
+        match self {
+            PolygonView::TwoDimensional(_) => true,
+            PolygonView::ThreeDimensional(_) => false,
+        }
+    }
+
+    fn is_3d(&self) -> bool {
+        !self.is_2d()
+    }
+}
+
+impl Default for PolygonView {
+    fn default() -> Self {
+        Self::TwoDimensional(PolygonState::default())
+    }
+}
+
 #[derive(Default, Debug, PartialEq)]
 pub struct Polygon {
     points: Vec<Vec2>,
-    state: PolygonState,
+    state: PolygonView,
 }
 
 impl Polygon {
     const PROXIMITY_THRESHOLD: f32 = 10.0;
 
+    pub fn swap_to_3d(&mut self) {
+        debug_assert!(self.state.is_2d());
+
+        todo!()
+    }
+
+    pub fn swap_to_2d(&mut self) {
+        debug_assert!(self.state.is_3d());
+
+        todo!()
+    }
+
+    pub fn points(&self) -> &[Vec2] {
+        &self.points
+    }
+
     pub fn add_point(
         &mut self,
         global_state: &GlobalState,
@@ -205,4 +248,8 @@ impl ObjectInfos {
         self.polygons.push(Polygon::default());
         self.polygons.last_mut().unwrap()
     }
+
+    pub fn iter_mut(&mut self) -> IterMut<'_, Polygon> {
+        self.polygons.iter_mut()
+    }
 }