From acbc4651c6d8a8290207b8d9690616a6097135be Mon Sep 17 00:00:00 2001
From: Clinton Selke <clinuxrulz@gmail.com>
Date: Fri, 16 Feb 2024 13:27:21 +1000
Subject: [PATCH] first attempt at invisible joystick example

---
 Cargo.toml            |   4 +
 examples/invisible.rs | 166 ++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 170 insertions(+)
 create mode 100644 examples/invisible.rs

diff --git a/Cargo.toml b/Cargo.toml
index 8aceb9f..f8afffc 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -20,6 +20,10 @@ required-features = ["inspect"]
 name = "multiple"
 required-features = ["inspect"]
 
+[[example]]
+name = "invisible"
+required-features = ["inspect"]
+
 [features]
 default = ["serde"]
 inspect = ["bevy-inspector-egui"]
diff --git a/examples/invisible.rs b/examples/invisible.rs
new file mode 100644
index 0000000..6f06d5c
--- /dev/null
+++ b/examples/invisible.rs
@@ -0,0 +1,166 @@
+use bevy::prelude::*;
+use bevy::window::PrimaryWindow;
+use bevy_inspector_egui::quick::WorldInspectorPlugin;
+
+use virtual_joystick::*;
+
+fn main() {
+    App::new()
+        .add_plugins(DefaultPlugins)
+        .add_plugins(WorldInspectorPlugin::new())
+        .add_plugins(VirtualJoystickPlugin::<String>::default())
+        .add_systems(Startup, create_scene)
+        .add_systems(PreUpdate, update_joystick_visibility)
+        .add_systems(Update, update_joystick)
+        .run();
+}
+
+#[derive(Component)]
+// Player with velocity
+struct Player(pub f32);
+
+#[derive(Component)]
+struct InvisibleJoystick;
+
+const JOYSTICK_BACKGROUND_SIZE: f32 = 150.0;
+
+fn create_scene(mut cmd: Commands, asset_server: Res<AssetServer>) {
+    cmd.spawn(Camera2dBundle {
+        transform: Transform::from_xyz(0., 0., 5.0),
+        ..default()
+    });
+    // Fake Player
+    cmd.spawn(SpriteBundle {
+        transform: Transform {
+            translation: Vec3::new(0., 0., 0.),
+            ..default()
+        },
+        texture: asset_server.load("Knob.png"),
+        sprite: Sprite {
+            color: Color::PURPLE,
+            custom_size: Some(Vec2::new(50., 50.)),
+            ..default()
+        },
+        ..default()
+    })
+    .insert(Player(50.));
+
+    // Spawn Invisible Virtual Joystick with entire screen as active area.
+    {
+        let knob_img = asset_server.load("Knob.png");
+        let background_img = asset_server.load("Outline.png");
+        let knob_color = None;
+        let background_color = None;
+        let interactable_area_color = None;
+        let knob_size = Vec2::new(75., 75.);
+        let background_size = Vec2::new(JOYSTICK_BACKGROUND_SIZE, JOYSTICK_BACKGROUND_SIZE);
+        let joystick_node = VirtualJoystickNode {
+            dead_zone: 0.,
+            id: "UniqueJoystick".to_string(),
+            axis: VirtualJoystickAxis::Both,
+            behaviour: VirtualJoystickType::Floating,
+        };
+        let joystick_node_style = Style {
+            width: Val::Px(background_size.x),
+            height: Val::Px(background_size.y),
+            position_type: PositionType::Absolute,
+            left: Val::Px(0.0),
+            bottom: Val::Px(0.0),
+            ..default()
+        };
+        let mut spawn =
+            cmd.spawn((VirtualJoystickBundle::new(joystick_node).set_style(joystick_node_style), InvisibleJoystick));
+        spawn.insert(Visibility::Hidden);
+        let spawn = spawn
+            .insert(VirtualJoystickInteractionArea)
+            .with_children(|parent| {
+                parent.spawn((
+                    VirtualJoystickUIKnob,
+                    ImageBundle {
+                        image: knob_img.into(),
+                        style: Style {
+                            width: Val::Px(knob_size.x),
+                            height: Val::Px(knob_size.y),
+                            ..default()
+                        },
+                        background_color: knob_color.unwrap_or(Color::WHITE).into(),
+                        ..default()
+                    },
+                ));
+                parent.spawn((
+                    VirtualJoystickUIBackground,
+                    ImageBundle {
+                        image: background_img.into(),
+                        style: Style {
+                            width: Val::Px(background_size.x),
+                            height: Val::Px(background_size.y),
+                            ..default()
+                        },
+                        background_color: background_color.unwrap_or(Color::WHITE).into(),
+                        ..default()
+                    },
+                ));
+            });
+
+        if let Some(c) = interactable_area_color {
+            spawn.insert(BackgroundColor(c));
+        }
+    }
+
+}
+
+fn update_joystick_visibility(
+    mut joystick: Query<(&mut Visibility, &mut Style), With<InvisibleJoystick>>,
+    q_windows: Query<&Window, (With<PrimaryWindow>, Without<InvisibleJoystick>)>,
+    touches: Res<Touches>,
+    buttons: Res<Input<MouseButton>>,
+) {
+    let change_visibility: Option<Visibility>;
+    let mut set_location: Option<Vec2> = None;
+    if touches.any_just_pressed() || buttons.any_just_pressed([MouseButton::Left]) {
+        change_visibility = Some(Visibility::Visible);
+        if touches.any_just_pressed() {
+            for touch in touches.iter() {
+                set_location = Some(touch.position());
+                break;
+            }
+        } else if buttons.any_just_pressed([MouseButton::Left]) {
+            if let Some(position) = q_windows.single().cursor_position() {
+                set_location = Some(position);
+            }
+        }
+    } else if touches.any_just_released() || touches.any_just_canceled() || buttons.any_just_released([MouseButton::Left]) {
+        change_visibility = Some(Visibility::Hidden);
+        set_location = None;
+    } else {
+        change_visibility = None;
+        set_location = None;
+    }
+
+    if let Some(change_visibility) = change_visibility {
+        for (mut joystick_visibility, _) in &mut joystick {
+            *joystick_visibility = change_visibility;
+        }
+    }
+
+    if let Some(set_location) = set_location {
+        for (_, mut joystick_style) in &mut joystick {
+            joystick_style.left = Val::Px(set_location.x - 0.5 * JOYSTICK_BACKGROUND_SIZE);
+            joystick_style.top = Val::Px(set_location.y - 0.5 * JOYSTICK_BACKGROUND_SIZE);
+        }
+    }
+}
+
+fn update_joystick(
+    mut joystick_events: EventReader<VirtualJoystickEvent<String>>,
+    mut player: Query<(&mut Transform, &Player)>,
+    time_step: Res<Time>,
+) {
+    let (mut player, player_data) = player.single_mut();
+
+    for j in joystick_events.read() {
+        let Vec2 { x, y } = j.axis();
+        player.translation.x += x * player_data.0 * time_step.delta_seconds();
+        player.translation.y += y * player_data.0 * time_step.delta_seconds();
+    }
+}