Define animations

src/main.rs

@@ -2,15 +2,15 @@ use sdl2::pixels::Color;
 use sdl2::event::Event;
 use sdl2::keyboard::Keycode;
 use sdl2::render::{WindowCanvas, Texture};
-use sdl2::image::{self, LoadTexture, InitFlag};
 use sdl2::rect::{Point, Rect};
+use sdl2::image::{self, LoadTexture, InitFlag};
 
 use specs::prelude::*;
 use specs_derive::Component;
 
 use std::time::Duration;
 
-const PLAYER_MOVEMENT_SPEED: i32 = 5;
+const PLAYER_MOVEMENT_SPEED: i32 = 20;
 
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
 enum Direction {
@@ -31,7 +31,7 @@ struct Velocity {
     direction: Direction,
 }
 
-#[derive(Component, Debug)]
+#[derive(Component, Debug, Clone)]
 #[storage(VecStorage)]
 struct Sprite {
     spritesheet: usize,
@@ -67,12 +67,32 @@ fn direction_spritesheet_row(direction: Direction) -> i32 {
     }
 }
 
-fn render(
-    canvas: &mut WindowCanvas, 
-    color: Color, 
+fn character_animation_frames(spritesheet: usize, top_left_frame: Rect, direction: Direction) -> Vec<Sprite> {
+    let (frame_width, frame_height) = top_left_frame.size();
+    let y_offset = top_left_frame.y() + frame_height as i32 * direction_spritesheet_row(direction);
+
+    let mut frames = Vec::new();
+    for i in 0..3 {
+        frames.push(Sprite {
+            spritesheet,
+            region: Rect::new(
+                top_left_frame.x() + frame_width as i32 * i,
+                y_offset,
+                frame_width,
+                frame_height,
+            )
+        })
+    }
+
+    return frames
+}
+
+fn render (
+    canvas: &mut WindowCanvas,
+    color: Color,
     texture: &Texture,
     player: &Player
-    ) -> Result<(), String> {
+) -> Result<(), String> {
     canvas.set_draw_color(color);
     canvas.clear();
 
@@ -109,7 +129,7 @@ fn update_player(player: &mut Player) {
         },
         Down => {
             player.position = player.position.offset(0, player.speed);
-        },
+        }
     }
 
     if player.speed != 0 {
@@ -120,26 +140,40 @@ fn update_player(player: &mut Player) {
 fn main() -> Result<(), String> {
     let sdl_context = sdl2::init()?;
     let video_subsystem = sdl_context.video()?;
-    let _image_context = image::init(InitFlag::PNG | InitFlag::JPG)?;
+    let _image_content = image::init(InitFlag::PNG | InitFlag::JPG)?;
 
     let window = video_subsystem.window("game tutorial", 800, 600)
         .position_centered()
         .build()
         .expect("could not initialize video subsystem");
 
-    let mut canvas =  window.into_canvas().build()
-        .expect("could not make a canvas");
-    
+    let mut canvas = window.into_canvas().build().expect("could not make a canvas");
+
     let texture_creator = canvas.texture_creator();
-    let texture = texture_creator.load_texture("assets/bardo.png")?;
 
-    let mut player = Player {
-        position: Point::new(0,0),
-        sprite: Rect::new(0, 0, 26, 36),
-        speed: 0,
-        direction: Direction::Right,
+    let textures = [
+        texture_creator.load_texture("assets/bardo.png")?,
+    ];
+
+    let player_spritesheet = 0;
+    let player_top_left_frame = Rect::new(0, 0, 26, 36);
+
+    let player_animation = MovementAnimation {
         current_frame: 0,
-    };
+        up_frames: character_animation_frames(player_spritesheet, player_top_left_frame, Direction::Up),
+        down_frames: character_animation_frames(player_spritesheet, player_top_left_frame, Direction::Down),
+        left_frames: character_animation_frames(player_spritesheet, player_top_left_frame, Direction::Left),
+        right_frames: character_animation_frames(player_spritesheet, player_top_left_frame, Direction::Right),
+    }
+
+    let mut world = World::new();
+
+    world.create_entity()
+        .with(Position(Point::new(0, 0)))
+        .with(Velocity {speed: 0, direction: Direction::Right}),
+        .with(player_animation.right_frames[0].clone())
+        .with(player_animation)
+        .build();
 
     let mut event_pump = sdl_context.event_pump()?;
     let mut i = 0;
@@ -150,19 +184,19 @@ fn main() -> Result<(), String> {
                 Event::KeyDown { keycode: Some(Keycode::Escape), .. } => {
                     break 'running;
                 },
-                Event::KeyDown { keycode: Some(Keycode::Left), .. } => {
+                Event::KeyDown { keycode: Some(Keycode::Left), repeat: false, .. } => {
                     player.speed = PLAYER_MOVEMENT_SPEED;
                     player.direction = Direction::Left;
                 },
-                Event::KeyDown { keycode: Some(Keycode::Right), .. } => {
+                Event::KeyDown { keycode: Some(Keycode::Right), repeat: false, .. } => {
                     player.speed = PLAYER_MOVEMENT_SPEED;
                     player.direction = Direction::Right;
                 },
-                Event::KeyDown { keycode: Some(Keycode::Up), .. } => {
+                Event::KeyDown { keycode: Some(Keycode::Up), repeat: false, .. } => {
                     player.speed = PLAYER_MOVEMENT_SPEED;
                     player.direction = Direction::Up;
                 },
-                Event::KeyDown { keycode: Some(Keycode::Down), .. } => {
+                Event::KeyDown { keycode: Some(Keycode::Down), repeat: false, .. } => {
                     player.speed = PLAYER_MOVEMENT_SPEED;
                     player.direction = Direction::Down;
                 },
@@ -179,10 +213,12 @@ fn main() -> Result<(), String> {
         i = (i + 1) % 255;
         update_player(&mut player);
 
-        render(&mut canvas, Color::RGB(i, 64, 255-i), &texture, &player)?;
+        render(&mut canvas, Color::RGB(i, 64, 255 - i), &texture, &player)?;
+
+        ::std::thread::sleep(Duration::new(0, 1_000_000_000u32 / 20));
 
-        ::std::thread::sleep(Duration::new(0, 1_000_000_000u32 / 60));
     }
 
+
     Ok(())
-}
+}