Replace bevy_pancam with custom Plugin

Cargo.lock

@@ -427,15 +427,6 @@ dependencies = [
  "glam",
 ]
 
-[[package]]
-name = "bevy_pancam"
-version = "0.6.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0ebc698de3f4e824a67f517fe9cca35f08d5fdaab99ed8e141102c582768fc62"
-dependencies = [
- "bevy",
-]
-
 [[package]]
 name = "bevy_pbr"
 version = "0.8.1"
@@ -2771,7 +2762,6 @@ name = "worlds-sim-rust"
 version = "0.1.0"
 dependencies = [
  "bevy",
- "bevy_pancam",
  "planet",
 ]
 

Cargo.toml

@@ -7,7 +7,7 @@ resolver = "2"
 [features]
 logging = ["planet/logging"]
 globe_view = ["planet/globe_view", "render"]
-render = ["bevy/bevy_asset", "bevy/bevy_winit", "bevy/x11", "bevy/wayland", "bevy/render", "planet/render", "dep:bevy_pancam"]
+render = ["bevy/bevy_asset", "bevy/bevy_winit", "bevy/x11", "bevy/wayland", "bevy/render", "planet/render"]
 default = ["render", "logging"]
 
 [dependencies.planet]
@@ -17,7 +17,3 @@ default-features = false
 [dependencies.bevy]
 version = "0.8"
 default-features = false
-
-[dependencies.bevy_pancam]
-version = "0.6.1"
-optional = true

src/components/mod.rs

@@ -1,6 +1,3 @@
 pub(crate) mod markers;
-
-pub(crate) mod third_party {
-    #[cfg(feature = "render")]
-    pub(crate) use bevy_pancam::PanCam;
-}
+#[cfg(feature = "render")]
+pub(crate) mod panning;

src/components/panning/mod.rs

@@ -0,0 +1,12 @@
+use bevy::ecs::component::Component;
+
+#[derive(Component)]
+pub(crate) struct Pan2d {
+    pub(crate) enabled: bool,
+}
+impl Pan2d {
+    #[must_use]
+    pub(crate) const fn new() -> Pan2d {
+        Pan2d { enabled: true }
+    }
+}

src/main.rs

@@ -89,7 +89,7 @@ use {
     },
     components::{
         markers::{InfoPanel, ToolbarButton},
-        third_party::PanCam,
+        panning::Pan2d,
     },
     planet::BiomeStats,
     resources::CursorMapPosition,
@@ -198,7 +198,7 @@ fn handle_toolbar_button(
     #[cfg(feature = "globe_view")] mut camera_2d_query: Query<
         '_,
         '_,
-        (&mut Camera, &mut PanCam),
+        (&mut Camera, &mut Pan2d),
         (With<Camera2d>, Without<Camera3d>),
     >,
     #[cfg(feature = "globe_view")] mut materials: ResMut<'_, Assets<StandardMaterial>>,
@@ -529,20 +529,17 @@ fn generate_graphics(
         });
     }
 
+    _ = commands.spawn_bundle(Camera2dBundle::default());
     _ = commands
-        .spawn_bundle(Camera2dBundle { ..default() })
-        .insert(PanCam {
-            max_scale: Some(80.0),
-            ..default()
-        });
-    _ = commands.spawn_bundle(SpriteBundle {
+        .spawn_bundle(SpriteBundle {
             texture: images.get_handle(world_manager.map_image_handle_id.unwrap()),
             sprite: Sprite {
                 custom_size: Some(custom_sprite_size),
                 ..default()
             },
             ..default()
-    });
+        })
+        .insert(Pan2d::new());
 
     _ = commands
         .spawn_bundle(NodeBundle {

src/plugins/mod.rs

@@ -1,2 +1,4 @@
+#[cfg(feature = "render")]
+pub(crate) mod panning_plugin;
 pub(crate) mod world_plugins;
 pub(crate) use world_plugins::WorldPlugins;

src/plugins/panning_plugin.rs

@@ -0,0 +1,47 @@
+use {
+    crate::components::panning::Pan2d,
+    bevy::{
+        app::{App, Plugin},
+        ecs::{
+            event::EventReader,
+            query::With,
+            system::{Query, Res},
+        },
+        input::{
+            mouse::{MouseButton, MouseMotion},
+            Input,
+        },
+        sprite::Sprite,
+        transform::components::Transform,
+    },
+};
+
+#[derive(Default)]
+pub(crate) struct PanningPlugin;
+
+impl Plugin for PanningPlugin {
+    fn build(&self, app: &mut App) {
+        _ = app.add_system(panning_system_2d);
+    }
+}
+
+fn panning_system_2d(
+    mut query: Query<'_, '_, (&mut Transform, &Pan2d), With<Sprite>>,
+    mut mouse_motion_events: EventReader<'_, '_, MouseMotion>,
+    input_mouse: Res<'_, Input<MouseButton>>,
+) {
+    if !input_mouse.pressed(MouseButton::Left) {
+        return;
+    }
+
+    let mut horizontal = 0.0;
+    for movement in mouse_motion_events.iter() {
+        horizontal += movement.delta.x;
+    }
+
+    query.for_each_mut(|(mut transform, pan)| {
+        if pan.enabled {
+            transform.translation.x += horizontal;
+        }
+    });
+}

src/plugins/world_plugins.rs

@@ -18,6 +18,7 @@ impl PluginGroup for WorldPlugins {
         #[cfg(feature = "render")]
         {
             use {
+                crate::plugins::panning_plugin::PanningPlugin,
                 bevy::{
                     asset::AssetPlugin,
                     core_pipeline::CorePipelinePlugin,
@@ -31,7 +32,6 @@ impl PluginGroup for WorldPlugins {
                     window::WindowPlugin,
                     winit::WinitPlugin,
                 },
-                bevy_pancam::PanCamPlugin,
             };
 
             _ = group
@@ -47,7 +47,7 @@ impl PluginGroup for WorldPlugins {
                 .add(SpritePlugin::default())
                 .add(TextPlugin::default())
                 .add(UiPlugin::default())
-                .add(PanCamPlugin::default());
+                .add(PanningPlugin::default());
             #[cfg(feature = "globe_view")]
             {
                 use bevy::pbr::PbrPlugin;