add paddles that can move

src/engine.rs

@@ -2,6 +2,7 @@ use crate::{BG, GAME_SIZE};
 
 use self::objs::{obj_traits::MovingObject, World};
 use std::{
+    collections::{HashMap, HashSet},
     num::NonZeroU32,
     process,
     rc::Rc,
@@ -11,7 +12,7 @@ use winit::{
     dpi::PhysicalSize,
     event::{Event, KeyEvent, StartCause, WindowEvent},
     event_loop::{ControlFlow, EventLoop},
-    keyboard::{Key, NamedKey},
+    keyboard::{Key, KeyCode, NamedKey, PhysicalKey},
     raw_window_handle::{HasDisplayHandle, HasWindowHandle},
     window::WindowBuilder,
 };
@@ -21,14 +22,25 @@ mod render;
 mod timer;
 
 type RenderFn = fn(&mut render::RenderCtx<'_, '_>, &mut World, &timer::GameTimer);
+type KeyHandlerFn = fn(&mut World, &timer::GameTimer);
+
 // core game engine struct
 pub struct Engine {
     event_loop: EventLoop<()>,
     render_fn: RenderFn,
     resize_fn: RenderFn,
+    kb_handlers: HashMap<KeyEventType, KeyHandlerFn>,
+    down_keys: HashSet<KeyCode>,
     world: World,
 }
 
+#[derive(PartialEq, Eq, Hash)]
+pub enum KeyEventType {
+    KeyDown(KeyCode),
+    KeyDownFrameUpdate(KeyCode),
+    KeyUp(KeyCode),
+}
+
 impl Engine {
     pub fn new() -> Self {
         let event_loop = EventLoop::new().unwrap();
@@ -37,6 +49,8 @@ impl Engine {
             event_loop,
             render_fn: |_, _, _| {},
             resize_fn: |_, _, _| {},
+            kb_handlers: HashMap::new(),
+            down_keys: HashSet::new(),
             world: World::new(),
         }
     }
@@ -57,6 +71,11 @@ impl Engine {
         self
     }
 
+    pub fn register_handler(mut self, ev_type: KeyEventType, f: KeyHandlerFn) -> Self {
+        self.kb_handlers.insert(ev_type, f);
+        self
+    }
+
     // runs the game and consumes self, this will finish the process
     pub fn run(self) -> ! {
         let Self {
@@ -64,6 +83,8 @@ impl Engine {
             mut world,
             render_fn,
             resize_fn,
+            kb_handlers,
+            mut down_keys,
         } = self;
 
         // set up window
@@ -81,16 +102,17 @@ impl Engine {
 
         event_loop
             .run(|event, elwt| {
-                // shoddy vsync
-                elwt.set_control_flow(ControlFlow::WaitUntil(
-                    Instant::now() + Duration::from_millis(1000 / 60),
-                ));
-
                 match event {
                     // redraw
                     Event::NewEvents(StartCause::ResumeTimeReached { .. }) => {
                         window.request_redraw();
                     }
+                    Event::NewEvents(StartCause::WaitCancelled {
+                        start,
+                        requested_resume,
+                    }) => {
+                        elwt.set_control_flow(ControlFlow::WaitUntil(requested_resume.unwrap()));
+                    }
                     Event::WindowEvent {
                         window_id,
                         event: WindowEvent::Resized(PhysicalSize { width, height }),
@@ -113,11 +135,30 @@ impl Engine {
                         window_id,
                         event: WindowEvent::RedrawRequested,
                     } => {
+                        // shoddy vsync
+                        elwt.set_control_flow(ControlFlow::WaitUntil(
+                            Instant::now() + Duration::from_millis(1000 / 60),
+                        ));
                         if window_id == window.id() {
                             if let (Some(width), Some(height)) = {
                                 let size = window.inner_size();
                                 (NonZeroU32::new(size.width), NonZeroU32::new(size.height))
                             } {
+                                for frame_handler in
+                                    kb_handlers.iter().filter_map(|(ev, handler)| {
+                                        if let KeyEventType::KeyDownFrameUpdate(keycode) = ev {
+                                            if down_keys.contains(keycode) {
+                                                Some(handler)
+                                            } else {
+                                                None
+                                            }
+                                        } else {
+                                            None
+                                        }
+                                    })
+                                {
+                                    frame_handler(&mut world, &timer)
+                                }
                                 surface.resize(width, height).unwrap();
                                 let buffer = surface.buffer_mut().unwrap();
 
@@ -147,14 +188,39 @@ impl Engine {
                     } => todo!(),
                     // potential future keyboard handling
                     Event::WindowEvent {
-                        window_id: _window_id,
+                        window_id: window_id,
                         event:
                             WindowEvent::KeyboardInput {
                                 device_id: _device_id,
-                                event: _event,
+                                event:
+                                    KeyEvent {
+                                        physical_key,
+                                        state,
+                                        repeat,
+                                        ..
+                                    },
                                 is_synthetic: _is_synthetic,
                             },
-                    } => {}
+                    } => {
+                        if !repeat {
+                            if let PhysicalKey::Code(keycode) = physical_key {
+                                let ev_type = match state {
+                                    winit::event::ElementState::Pressed => {
+                                        down_keys.insert(keycode);
+                                        KeyEventType::KeyDown(keycode)
+                                    }
+                                    winit::event::ElementState::Released => {
+                                        down_keys.remove(&keycode);
+                                        KeyEventType::KeyUp(keycode)
+                                    }
+                                };
+
+                                if let Some(handler) = kb_handlers.get(&ev_type) {
+                                    handler(&mut world, &timer)
+                                }
+                            }
+                        }
+                    }
                     _ => {}
                 }
             })

src/engine/objs/geometry.rs

@@ -5,7 +5,7 @@ pub struct Position {
 }
 
 impl Position {
-    pub fn new(x: u32, y: u32) -> Self {
+    pub const fn new(x: u32, y: u32) -> Self {
         Self { x, y }
     }
 }

src/engine/objs/obj_traits.rs

@@ -38,4 +38,32 @@ pub trait MovingObject: Object {
         ctx.rect(prev_x, prev_y, width, height, BG);
         self.display(ctx);
     }
+
+    fn move_constrained(
+        &mut self,
+        x: i32,
+        y: i32,
+        constraint_start: Position,
+        constraint_end: Position,
+    ) {
+        let Position { x: cur_x, y: cur_y } = self.position();
+        let Size { width, height } = self.size();
+
+        let new_x = if cur_x.saturating_add_signed(x) <= constraint_start.x {
+            constraint_start.x
+        } else if (cur_x + width.saturating_add_signed(y)) > constraint_end.x {
+            constraint_end.x - width
+        } else {
+            cur_x.saturating_add_signed(x)
+        };
+
+        let new_y = if cur_y.saturating_add_signed(y) < constraint_start.y {
+            constraint_start.y
+        } else if (cur_y + height.saturating_add_signed(y)) >= constraint_end.y {
+            constraint_end.y - height
+        } else {
+            cur_y.saturating_add_signed(y)
+        };
+        self.update_pos(new_x, new_y)
+    }
 }

src/engine/objs/primitive_shapes.rs

@@ -10,7 +10,7 @@ pub struct Rect {
 }
 
 impl Rect {
-    pub fn new(x: u32, y: u32, height: u32, width: u32) -> Self {
+    pub fn new(x: u32, y: u32, width: u32, height: u32) -> Self {
         Self {
             pos: Position::new(x, y),
             size: Size::new(width, height),
@@ -42,10 +42,10 @@ pub struct MovingRect {
 }
 
 impl MovingRect {
-    pub fn new(x: u32, y: u32, height: u32, width: u32) -> Self {
+    pub fn new(x: u32, y: u32, width: u32, height: u32) -> Self {
         Self {
             prev_pos: Position::new(x, y),
-            current: Rect::new(x, y, height, width),
+            current: Rect::new(x, y, width, height),
         }
     }
 

src/main.rs

@@ -1,16 +1,99 @@
 use std::rc::Rc;
 
-use engine::Engine;
+use engine::{
+    objs::{geometry::Position, primitive_shapes::MovingRect},
+    Engine,
+};
+use winit::{
+    event::KeyEvent,
+    keyboard::{Key, KeyCode, NamedKey, PhysicalKey, SmolStr},
+};
 
 const GAME_SIZE: (u32, u32) = (1200, 800);
 const BORDER_WIDTH: u32 = 10;
+const PADDLE_SIZE: (u32, u32) = (BORDER_WIDTH, 100);
+const PADDLE_OFFSET: u32 = 20;
+const PADDLE_SPEED: i32 = 10;
 const FG: u32 = 0xebdbb2;
 const BG: u32 = 0x282828;
 
 fn main() {
     let mut engine = Engine::new();
-    // let _ = engine.insert_into_world(Rc::new(MovingRect::new(0, 0, 50, 100)));
+
+    // left paddle
+    let _left_paddle_id = engine.insert_into_world(Rc::new(MovingRect::new(
+        BORDER_WIDTH + PADDLE_OFFSET,
+        GAME_SIZE.1 / 2 - PADDLE_SIZE.1 / 2,
+        PADDLE_SIZE.0,
+        PADDLE_SIZE.1,
+    )));
+    let _right_paddle_id = engine.insert_into_world(Rc::new(MovingRect::new(
+        GAME_SIZE.0 - (BORDER_WIDTH + PADDLE_OFFSET + PADDLE_SIZE.0),
+        GAME_SIZE.1 / 2 - PADDLE_SIZE.1 / 2,
+        PADDLE_SIZE.0,
+        PADDLE_SIZE.1,
+    )));
+
+    const LEFT_PADDLE_CONSTRAINTS: (Position, Position) = (
+        Position::new(BORDER_WIDTH + PADDLE_OFFSET, BORDER_WIDTH),
+        Position::new(BORDER_WIDTH * 2 + PADDLE_OFFSET, GAME_SIZE.1 - BORDER_WIDTH),
+    );
+    const RIGHT_PADDLE_CONSTRAINTS: (Position, Position) = (
+        Position::new(
+            GAME_SIZE.0 - (BORDER_WIDTH + PADDLE_OFFSET + PADDLE_SIZE.0),
+            BORDER_WIDTH,
+        ),
+        Position::new(
+            GAME_SIZE.0 - (BORDER_WIDTH + PADDLE_OFFSET),
+            GAME_SIZE.1 - BORDER_WIDTH,
+        ),
+    );
+
     engine
+        .register_handler(
+            engine::KeyEventType::KeyDownFrameUpdate(KeyCode::KeyW),
+            |world, timer| {
+                Rc::get_mut(world.get_mut(0)).unwrap().move_constrained(
+                    0,
+                    -PADDLE_SPEED,
+                    LEFT_PADDLE_CONSTRAINTS.0,
+                    LEFT_PADDLE_CONSTRAINTS.1,
+                )
+            },
+        )
+        .register_handler(
+            engine::KeyEventType::KeyDownFrameUpdate(KeyCode::KeyS),
+            |world, timer| {
+                Rc::get_mut(world.get_mut(0)).unwrap().move_constrained(
+                    0,
+                    PADDLE_SPEED,
+                    LEFT_PADDLE_CONSTRAINTS.0,
+                    LEFT_PADDLE_CONSTRAINTS.1,
+                )
+            },
+        )
+        .register_handler(
+            engine::KeyEventType::KeyDownFrameUpdate(KeyCode::KeyK),
+            |world, timer| {
+                Rc::get_mut(world.get_mut(1)).unwrap().move_constrained(
+                    0,
+                    -PADDLE_SPEED,
+                    RIGHT_PADDLE_CONSTRAINTS.0,
+                    RIGHT_PADDLE_CONSTRAINTS.1,
+                )
+            },
+        )
+        .register_handler(
+            engine::KeyEventType::KeyDownFrameUpdate(KeyCode::KeyJ),
+            |world, timer| {
+                Rc::get_mut(world.get_mut(1)).unwrap().move_constrained(
+                    0,
+                    PADDLE_SPEED,
+                    RIGHT_PADDLE_CONSTRAINTS.0,
+                    RIGHT_PADDLE_CONSTRAINTS.1,
+                )
+            },
+        )
         .set_resize_fn(|ctx, world, timer| {
             // top
             ctx.rect(0, 0, GAME_SIZE.0, BORDER_WIDTH, FG);
@@ -34,11 +117,8 @@ fn main() {
             ctx.rect(0, GAME_SIZE.1 - BORDER_WIDTH, GAME_SIZE.0, 10, FG);
         })
         .set_render_fn(|ctx, world, timer| {
-            // println!("t: {}", timer.game_time_passed());
+            Rc::get_mut(world.get_mut(0)).unwrap().draw_move(ctx);
-            // let obj = Rc::get_mut(world.get_mut(0)).unwrap();
+            Rc::get_mut(world.get_mut(1)).unwrap().draw_move(ctx);
-            // obj.move_obj(1, 0);
-            // obj.draw_move(ctx)
-            // Rect::square((timer.game_time_passed() * 20.) as u32, 0, 200).display(ctx);
         })
         .run();
 }