restore debug example after merge

examples/ortho_debug.rs

@@ -0,0 +1,39 @@
+use bevy::prelude::*;
+use bevy_tiled_prototype::{DebugConfig, Object, TiledMapCenter};
+
+// this example demonstrates debugging objects. Hit spacebar to toggle them
+
+const SCALE: f32 = 2.0;
+
+fn main() {
+    App::build()
+        .add_plugins(DefaultPlugins)
+        .add_plugin(bevy_tiled_prototype::TiledMapPlugin)
+        .add_system(bevy::input::system::exit_on_esc_system.system())
+        .add_system(toggle_debug.system())
+        .add_startup_system(setup.system())
+        .run();
+}
+
+fn setup(mut commands: Commands, asset_server: Res<AssetServer>) {
+    commands
+        .spawn(bevy_tiled_prototype::TiledMapComponents {
+            map_asset: asset_server.load("ortho-map.tmx"),
+            center: TiledMapCenter(true),
+            origin: Transform::from_scale(Vec3::new(SCALE, SCALE, 1.0)),
+            debug_config: DebugConfig {
+                enabled: true,
+                material: None,
+            },
+            ..Default::default()
+        })
+        .spawn(OrthographicCameraBundle::new_2d());
+}
+
+fn toggle_debug(keyboard_input: Res<Input<KeyCode>>, mut query: Query<&mut Visible, With<Object>>) {
+    for mut visible in query.iter_mut() {
+        if keyboard_input.just_released(KeyCode::Space) {
+            visible.is_visible = !visible.is_visible;
+        }
+    }
+}