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Adds a basic touch input system Co-authored-by: Michael Hills <mhills@gmail.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,99 @@ | ||
| use bevy_app::{EventReader, Events}; | ||
| use bevy_ecs::{Local, Res, ResMut}; | ||
| use bevy_math::Vec2; | ||
| use std::collections::{HashMap, HashSet}; | ||
|
|
||
| /// A touch input event | ||
| #[derive(Debug, Clone)] | ||
| pub struct TouchInput { | ||
| pub phase: TouchPhase, | ||
| pub position: Vec2, | ||
| /// | ||
| /// ## Platform-specific | ||
| /// | ||
| /// Unique identifier of a finger. | ||
| pub id: u64, | ||
| } | ||
|
|
||
| /// Describes touch-screen input state. | ||
| #[derive(Debug, Hash, PartialEq, Eq, Clone, Copy)] | ||
| #[cfg_attr(feature = "serialize", derive(serde::Serialize, serde::Deserialize))] | ||
| pub enum TouchPhase { | ||
| Started, | ||
| Moved, | ||
| Ended, | ||
| Cancelled, | ||
| } | ||
|
|
||
| #[derive(Default)] | ||
| pub struct TouchSystemState { | ||
| touch_event_reader: EventReader<TouchInput>, | ||
| } | ||
|
|
||
| #[derive(Debug, Clone)] | ||
| pub struct ActiveTouch { | ||
| start_position: Vec2, | ||
| previous_position: Vec2, | ||
| current_position: Vec2, | ||
| } | ||
|
|
||
| impl ActiveTouch { | ||
| pub fn delta(&self) -> Vec2 { | ||
| self.current_position - self.previous_position | ||
| } | ||
|
|
||
| pub fn distance(&self) -> Vec2 { | ||
| self.current_position - self.start_position | ||
| } | ||
| } | ||
|
|
||
| #[derive(Default)] | ||
| pub struct TouchInputState { | ||
| pub active_touches: HashMap<u64, ActiveTouch>, | ||
| pub just_pressed: HashSet<u64>, | ||
| pub just_released: HashSet<u64>, | ||
| pub just_cancelled: HashSet<u64>, | ||
| } | ||
|
|
||
| /// Updates the TouchInputState resource with the latest TouchInput events | ||
| pub fn touch_screen_input_system( | ||
| mut state: Local<TouchSystemState>, | ||
| mut touch_state: ResMut<TouchInputState>, | ||
| touch_input_events: Res<Events<TouchInput>>, | ||
| ) { | ||
| touch_state.just_pressed.clear(); | ||
| touch_state.just_released.clear(); | ||
| touch_state.just_cancelled.clear(); | ||
|
|
||
| for event in state.touch_event_reader.iter(&touch_input_events) { | ||
| let active_touch = touch_state.active_touches.get(&event.id); | ||
| match event.phase { | ||
| TouchPhase::Started => { | ||
| touch_state.active_touches.insert( | ||
| event.id, | ||
| ActiveTouch { | ||
| start_position: event.position, | ||
| previous_position: event.position, | ||
| current_position: event.position, | ||
| }, | ||
| ); | ||
| touch_state.just_pressed.insert(event.id); | ||
| } | ||
| TouchPhase::Moved => { | ||
| let old_touch = active_touch.unwrap(); | ||
| let mut new_touch = old_touch.clone(); | ||
| new_touch.previous_position = new_touch.current_position; | ||
| new_touch.current_position = event.position; | ||
| touch_state.active_touches.insert(event.id, new_touch); | ||
| } | ||
| TouchPhase::Ended => { | ||
| touch_state.active_touches.remove(&event.id); | ||
| touch_state.just_released.insert(event.id); | ||
| } | ||
| TouchPhase::Cancelled => { | ||
| touch_state.active_touches.remove(&event.id); | ||
| touch_state.just_cancelled.insert(event.id); | ||
| } | ||
| }; | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,40 @@ | ||
| use bevy::{input::touch::*, prelude::*}; | ||
|
|
||
| fn main() { | ||
| App::build() | ||
| .add_default_plugins() | ||
| .init_resource::<TouchHandlerState>() | ||
| .add_system(touch_system.system()) | ||
| .run(); | ||
| } | ||
|
|
||
| #[derive(Default)] | ||
| struct TouchHandlerState { | ||
| touch_event_reader: EventReader<TouchInput>, | ||
| } | ||
|
|
||
| fn touch_system( | ||
| mut state: ResMut<TouchHandlerState>, | ||
| touch_events: Res<Events<TouchInput>>, | ||
| touch_input_state: Res<TouchInputState>, | ||
| ) { | ||
| for event in state.touch_event_reader.iter(&touch_events) { | ||
| if touch_input_state.just_pressed.contains(&event.id) { | ||
| println!( | ||
| "just pressed touch with id: {:?}, at: {:?}", | ||
| event.id, event.position | ||
| ); | ||
| } | ||
|
|
||
| if touch_input_state.just_released.contains(&event.id) { | ||
| println!( | ||
| "just released touch with id: {:?}, at: {:?}", | ||
| event.id, event.position | ||
| ); | ||
| } | ||
|
|
||
| if touch_input_state.just_cancelled.contains(&event.id) { | ||
| println!("cancelled touch with id: {:?}", event.id); | ||
| } | ||
| } | ||
| } |