Refactor input handling

src/input/mod.rs

@@ -7,32 +7,42 @@ use winit::event::{
     DeviceEvent, ElementState, KeyboardInput, MouseButton, TouchPhase, WindowEvent,
 };
 
-use crate::input::camera_controller::CameraController;
+use crate::input::pan_handler::PanHandler;
+use crate::input::pinch_handler::PinchHandler;
+use crate::input::shift_handler::ShiftHandler;
+use crate::input::tilt_handler::TiltHandler;
 use crate::render::camera::Camera;
 use crate::render::render_state::RenderState;
 
-mod camera_controller;
+mod pan_handler;
+mod pinch_handler;
+mod shift_handler;
+mod tilt_handler;
 
-pub struct InputHandler {
-    camera_controller: CameraController,
-
-    mouse_position: Option<Vector2<f64>>,
-    last_mouse_position: Option<Vector2<f64>>,
-    initial_camera: Option<Camera>,
-    initial_camera_position: Option<cgmath::Point3<f64>>,
-    mouse_pressed: bool,
+pub struct InputController {
+    pinch_handler: PinchHandler,
+    pan_handler: PanHandler,
+    tilt_handler: TiltHandler,
+    shift_handler: ShiftHandler,
 }
 
-impl InputHandler {
-    pub fn new() -> Self {
-        let camera_controller = CameraController::new(5.0, 100.0);
+impl InputController {
+    /// Creates a new input controller.
+    ///
+    /// # Arguments
+    ///
+    /// * `speed`: How fast animation should go. Default is 1.0. 2.0 is a speedup of 2.
+    /// * `sensitivity`: How much impact an action has. Default is 10px for pressing the forward
+    /// key for example.
+    ///
+    /// returns: InputController
+    ///
+    pub fn new(speed: f64, sensitivity: f64) -> Self {
         Self {
-            initial_camera_position: None,
-            mouse_position: None,
-            last_mouse_position: None,
-            initial_camera: None,
-            mouse_pressed: false,
-            camera_controller,
+            pinch_handler: PinchHandler::new(),
+            pan_handler: PanHandler::new(),
+            tilt_handler: TiltHandler::new(speed, sensitivity),
+            shift_handler: ShiftHandler::new(speed, sensitivity),
         }
     }
 
@@ -42,36 +52,12 @@ impl InputHandler {
         }
     }
 
-    fn pan_camera(&mut self, position: Vector2<f64>, render_state: &mut RenderState) {
-        if let (Some(last_mouse_position), Some(initial_camera_position), Some(initial_camera)) = (
-            self.last_mouse_position,
-            self.initial_camera_position,
-            self.initial_camera.as_ref(),
-        ) {
-            self.camera_controller.pan_camera(
-                initial_camera_position,
-                last_mouse_position,
-                position,
-                initial_camera,
-                &render_state.camera,
-                &render_state.perspective,
-            );
-        } else {
-            self.last_mouse_position = Some(position);
-            self.initial_camera_position = Some(render_state.camera.position);
-            self.initial_camera = Some(render_state.camera.clone());
-        }
-    }
-
-    pub fn window_input(&mut self, event: &WindowEvent, render_state: &mut RenderState) -> bool {
+    pub fn window_input(&mut self, event: &WindowEvent, render_state: &RenderState) -> bool {
         match event {
             WindowEvent::CursorMoved { position, .. } => {
-                if self.mouse_pressed {
-                    let mouse_position: (f64, f64) = position.to_owned().into();
-                    self.pan_camera(Vector2::from(mouse_position), render_state);
-                    self.mouse_position = Some(Vector2::from(mouse_position));
-                }
-                true
+                let position: (f64, f64) = position.to_owned().into();
+                self.pan_handler
+                    .process_window_position(&Vector2::from(position), false)
             }
             WindowEvent::KeyboardInput {
                 input:
@@ -82,67 +68,39 @@ impl InputHandler {
                     },
                 ..
             } => match key {
-                _ => self.camera_controller.process_keyboard(*key, *state),
+                _ => self.shift_handler.process_key_press(*key, *state),
             },
-            WindowEvent::Touch(touch) => {
-                let touch_position: (f64, f64) = touch.location.to_owned().into();
-                match touch.phase {
-                    TouchPhase::Started => {
-                        self.last_mouse_position = Some(Vector2::from(touch_position));
-                        self.initial_camera_position = Some(render_state.camera.position);
-                    }
-                    TouchPhase::Moved | TouchPhase::Ended => {
-                        self.pan_camera(Vector2::from(touch_position), render_state);
-                    }
-                    TouchPhase::Cancelled => {}
-                }
-
-                true
+            WindowEvent::Touch(touch) => match touch.phase {
+                TouchPhase::Started => self.pan_handler.process_touch_start(),
+                TouchPhase::Ended => self.pan_handler.process_touch_end(),
+                TouchPhase::Moved => {
+                    let position: (f64, f64) = touch.location.to_owned().into();
+                    self.pan_handler
+                        .process_window_position(&Vector2::from(position), true)
                 }
+                TouchPhase::Cancelled => false,
+            },
             WindowEvent::MouseWheel { delta, .. } => {
-                self.camera_controller.process_scroll(delta);
+                self.shift_handler.process_scroll(delta);
                 true
             }
-            WindowEvent::MouseInput {
-                button: MouseButton::Left, // Left Mouse Button
-                state,
-                ..
-            } => {
-                self.mouse_pressed = *state == ElementState::Pressed;
-
-                if !self.mouse_pressed {
-                    /*if let (
-                        Some(last_mouse_position),
-                        Some(initial_camera_position),
-                        Some(initial_camera),
-                        Some(mouse_position),
-                    ) = (
-                        self.last_mouse_position,
-                        self.initial_camera_position,
-                        self.initial_camera.as_ref(),
-                        self.mouse_position,
-                    ) {
-                        self.camera_controller.pan_camera(
-                            initial_camera_position,
-                            last_mouse_position,
-                            mouse_position,
-                            initial_camera,
-                            &render_state.camera,
-                            &render_state.perspective,
-                        );
-                    }*/
-
-                    self.last_mouse_position = None;
-                    self.initial_camera_position = None;
-                    self.initial_camera = None;
-                }
-                true
+            WindowEvent::MouseInput { button, state, .. } => {
+                self.pan_handler.process_mouse_key_press(button, state)
             }
             _ => false,
         }
     }
+}
 
-    pub fn update_state(&mut self, state: &mut RenderState, dt: Duration) {
-        self.camera_controller.update_camera(&mut state.camera, dt);
+pub trait UpdateState {
+    fn update_state(&mut self, state: &mut RenderState, dt: Duration);
+}
+
+impl UpdateState for InputController {
+    fn update_state(&mut self, state: &mut RenderState, dt: Duration) {
+        self.pan_handler.update_state(state, dt);
+        self.pinch_handler.update_state(state, dt);
+        self.tilt_handler.update_state(state, dt);
+        self.shift_handler.update_state(state, dt);
     }
 }

src/input/pan_handler.rs

@@ -0,0 +1,108 @@
+use super::UpdateState;
+use crate::render::camera::{Camera, Perspective};
+use crate::render::render_state::RenderState;
+use cgmath::{EuclideanSpace, Point3, Vector2, Vector3};
+use std::time::Duration;
+use winit::event::{ElementState, MouseButton};
+
+pub struct PanHandler {
+    window_position: Option<Vector2<f64>>,
+    start_window_position: Option<Vector2<f64>>,
+    start_camera_position: Option<Vector3<f64>>,
+    reference_camera: Option<Camera>,
+    is_panning: bool,
+}
+
+impl UpdateState for PanHandler {
+    fn update_state(&mut self, state: &mut RenderState, _dt: Duration) {
+        if !self.is_panning {
+            return;
+        }
+
+        if let Some(reference_camera) = &self.reference_camera {
+            if let (Some(window_position), Some(start_window_position)) =
+                (self.window_position, self.start_window_position)
+            {
+                let perspective = &state.perspective;
+                let view_proj = reference_camera.calc_view_proj(perspective);
+
+                let start =
+                    reference_camera.project_screen_to_world(&start_window_position, &view_proj);
+                let current =
+                    reference_camera.project_screen_to_world(&window_position, &view_proj);
+                let delta = start - current;
+
+                if self.start_camera_position.is_none() {
+                    self.start_camera_position = Some(state.camera.position.to_vec());
+                }
+
+                if let Some(start_camera_position) = self.start_camera_position {
+                    state.camera.position = Point3::from_vec(
+                        start_camera_position + Vector3::new(delta.x, delta.y, 0.0),
+                    );
+                }
+            }
+        } else {
+            self.reference_camera = Some(state.camera.clone());
+        }
+    }
+}
+
+impl PanHandler {
+    pub fn new() -> Self {
+        Self {
+            window_position: None,
+            start_window_position: None,
+            start_camera_position: None,
+            reference_camera: None,
+            is_panning: false,
+        }
+    }
+
+    pub fn process_touch_start(&mut self) -> bool {
+        self.is_panning = true;
+        true
+    }
+
+    pub fn process_touch_end(&mut self) -> bool {
+        self.start_camera_position = None;
+        self.start_window_position = None;
+        self.window_position = None;
+        self.reference_camera = None;
+        self.is_panning = false;
+        true
+    }
+
+    pub fn process_window_position(&mut self, window_position: &Vector2<f64>, touch: bool) -> bool {
+        if !self.is_panning && !touch {
+            self.start_window_position = Some(*window_position);
+            self.window_position = Some(*window_position);
+        } else {
+            self.window_position = Some(*window_position);
+        }
+
+        true
+    }
+    pub fn process_mouse_key_press(&mut self, key: &MouseButton, state: &ElementState) -> bool {
+        if *key != MouseButton::Left {
+            return false;
+        }
+
+        if !self.is_panning {
+            // starting to pan
+        }
+
+        if *state == ElementState::Pressed {
+            // currently panning or starting to pan
+            self.is_panning = true;
+        } else {
+            // finished panning
+            self.start_camera_position = None;
+            self.start_window_position = None;
+            self.window_position = None;
+            self.reference_camera = None;
+            self.is_panning = false;
+        }
+        true
+    }
+}

src/input/pinch_handler.rs

@@ -0,0 +1,17 @@
+use super::UpdateState;
+use crate::render::render_state::RenderState;
+use std::time::Duration;
+
+pub struct PinchHandler {}
+
+impl UpdateState for PinchHandler {
+    fn update_state(&mut self, state: &mut RenderState, dt: Duration) {
+        // TODO
+    }
+}
+
+impl PinchHandler {
+    pub fn new() -> Self {
+        Self {}
+    }
+}

src/input/shift_handler.rs

@@ -1,28 +1,49 @@
-use cgmath::{EuclideanSpace, Matrix4, Point3, Vector2, Vector3, Vector4, Zero};
-use log::info;
+use super::UpdateState;
+use crate::render::render_state::RenderState;
+use cgmath::{Vector3, Zero};
+use std::time::Duration;
 
-use crate::render::camera;
-
-#[derive(Debug)]
-pub struct CameraController {
-    camera_position: Option<Vector3<f64>>,
+pub struct ShiftHandler {
     camera_translate: Vector3<f64>,
 
     speed: f64,
     sensitivity: f64,
 }
 
-impl CameraController {
+impl UpdateState for ShiftHandler {
+    fn update_state(&mut self, state: &mut RenderState, dt: Duration) {
+        let dt = dt.as_secs_f64() * (1.0 / self.speed);
+
+        // Move in/out (aka. "zoom")
+        // Note: this isn't an actual zoom. The camera's position
+        // changes when zooming. I've added this to make it easier
+        // to get closer to an object you want to focus on.
+        let delta = self.camera_translate * dt;
+        state.camera.position += delta;
+        self.camera_translate -= delta;
+    }
+}
+
+impl ShiftHandler {
     pub fn new(speed: f64, sensitivity: f64) -> Self {
         Self {
-            camera_position: None,
             camera_translate: Vector3::zero(),
             speed,
             sensitivity,
         }
     }
 
-    pub fn process_keyboard(
+    pub fn process_scroll(&mut self, delta: &winit::event::MouseScrollDelta) {
+        self.camera_translate.z -= match delta {
+            winit::event::MouseScrollDelta::LineDelta(_, scroll) => *scroll as f64 * 50.0,
+            winit::event::MouseScrollDelta::PixelDelta(winit::dpi::PhysicalPosition {
+                y: scroll,
+                ..
+            }) => *scroll,
+        } * self.sensitivity;
+    }
+
+    pub fn process_key_press(
         &mut self,
         key: winit::event::VirtualKeyCode,
         state: winit::event::ElementState,
@@ -52,66 +73,4 @@ impl CameraController {
             _ => false,
         }
     }
-
-    pub fn pan_camera(
-        &mut self,
-        initial_camera_position: cgmath::Point3<f64>,
-        initial_screen_position: Vector2<f64>,
-        current_screen_position: Vector2<f64>,
-        intial_camera: &camera::Camera,
-        camera: &camera::Camera,
-        perspective: &camera::Perspective,
-    ) {
-        let view_proj = camera.calc_view_proj(perspective);
-        let initial = camera.project_screen_to_world(
-            &initial_screen_position,
-            &intial_camera.calc_view_proj(perspective),
-        );
-        let current = camera.project_screen_to_world(
-            &current_screen_position,
-            &intial_camera.calc_view_proj(perspective),
-        );
-        let delta = initial - current;
-
-        info!("initial: {:?}", initial);
-        info!("current: {:?}", current);
-        info!("delta: {:?}", delta);
-
-        self.camera_position =
-            Some(initial_camera_position.to_vec() + Vector3::new(delta.x, delta.y, 0.0));
-        //self.camera_position = Some(Vector3::new(-delta.x, delta.y, 0.0))
-    }
-
-    pub fn process_scroll(&mut self, delta: &winit::event::MouseScrollDelta) {
-        self.camera_translate.z -= match delta {
-            winit::event::MouseScrollDelta::LineDelta(_, scroll) => *scroll as f64 * 50.0,
-            winit::event::MouseScrollDelta::PixelDelta(winit::dpi::PhysicalPosition {
-                y: scroll,
-                ..
-            }) => *scroll,
-        } * self.sensitivity;
-    }
-
-    pub fn update_camera(
-        &mut self,
-        camera: &mut crate::render::camera::Camera,
-        dt: std::time::Duration,
-    ) {
-        let dt = dt.as_secs_f64() * self.speed;
-
-        if let Some(position) = self.camera_position {
-            info!("position: {:?}", position);
-            camera.position = Point3::from_vec(position);
-            //camera.translation = Matrix4::from_translation(position);
-            self.camera_position = None;
-        }
-
-        // Move in/out (aka. "zoom")
-        // Note: this isn't an actual zoom. The camera's position
-        // changes when zooming. I've added this to make it easier
-        // to get closer to an object you want to focus on.
-        let delta = self.camera_translate * dt;
-        camera.position += delta;
-        self.camera_translate -= delta;
-    }
 }

src/input/tilt_handler.rs

@@ -0,0 +1,20 @@
+use super::UpdateState;
+use crate::render::render_state::RenderState;
+use std::time::Duration;
+
+pub struct TiltHandler {
+    speed: f64,
+    sensitivity: f64,
+}
+
+impl UpdateState for TiltHandler {
+    fn update_state(&mut self, state: &mut RenderState, dt: Duration) {
+        // TODO
+    }
+}
+
+impl TiltHandler {
+    pub fn new(speed: f64, sensitivity: f64) -> Self {
+        Self { speed, sensitivity }
+    }
+}

src/main_loop.rs

@@ -3,7 +3,7 @@ use log::{error, info, trace};
 use winit::event::{ElementState, Event, KeyboardInput, VirtualKeyCode, WindowEvent};
 use winit::event_loop::{ControlFlow, EventLoop};
 
-use crate::input::InputHandler;
+use crate::input::{InputController, UpdateState};
 use crate::io::worker_loop::WorkerLoop;
 use crate::platform::Instant;
 use crate::render::render_state::RenderState;
@@ -17,7 +17,7 @@ pub async fn setup(
 
     fetch_munich_tiles(worker_loop.as_ref());
 
-    let mut input = InputHandler::new();
+    let mut input = InputController::new(0.2, 100.0);
     let mut maybe_state: Option<RenderState> = if cfg!(target_os = "android") {
         None
     } else {