kludgine 0.1.0-dev.3

An asynchronous app and 2d game framework
Documentation 
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use std::time::Duration;

use kludgine::prelude::*;

fn main() {
    SingleWindowApplication::run(SpriteSheetExample::default());
}

#[derive(Default)]
struct SpriteSheetExample {
    sprite: Option<Sprite>,
    current_frame: Option<SpriteSource>,
}

impl WindowCreator for SpriteSheetExample {
    fn window_title(&self) -> String {
        "Sprite Sheet - Kludgine".to_owned()
    }
}

#[derive(Debug, Hash, Eq, PartialEq)]
enum StickGuy {
    Idle1,
    Idle2,
    Idle3,
    Idle4,
    WalkRight1,
    WalkRight2,
    WalkRight3,
    WalkLeft1,
    WalkLeft2,
    WalkLeft3,
}

impl Window for SpriteSheetExample {
    fn initialize(
        &mut self,
        _scene: &Target,
        _requester: RedrawRequester,
        _window: WindowHandle,
    ) -> kludgine::Result<()> {
        let texture = include_texture!("assets/stickguy.png")?;
        let sheet = SpriteSheet::new(
            texture,
            Size::new(32, 32),
            vec![
                StickGuy::Idle1,
                StickGuy::Idle2,
                StickGuy::Idle3,
                StickGuy::Idle4,
                StickGuy::WalkRight1,
                StickGuy::WalkRight2,
                StickGuy::WalkRight3,
                StickGuy::WalkLeft1,
                StickGuy::WalkLeft2,
                StickGuy::WalkLeft3,
            ],
        );
        let idle = SpriteAnimation::new(
            sheet
                .sprites(vec![
                    StickGuy::Idle1,
                    StickGuy::Idle2,
                    StickGuy::Idle3,
                    StickGuy::Idle4,
                ])
                .into_iter()
                .map(|source| SpriteFrame {
                    source,
                    duration: Some(Duration::from_millis(500)),
                })
                .collect(),
        )
        .with_mode(AnimationMode::Forward);
        let walk_left = SpriteAnimation::new(
            sheet
                .sprites(vec![
                    StickGuy::WalkLeft1,
                    StickGuy::WalkLeft2,
                    StickGuy::WalkLeft3,
                ])
                .into_iter()
                .map(|source| SpriteFrame {
                    source,
                    duration: Some(Duration::from_millis(200)),
                })
                .collect(),
        )
        .with_mode(AnimationMode::PingPong);
        let walk_right = SpriteAnimation::new(
            sheet
                .sprites(vec![
                    StickGuy::WalkRight1,
                    StickGuy::WalkRight2,
                    StickGuy::WalkRight3,
                ])
                .into_iter()
                .map(|source| SpriteFrame {
                    source,
                    duration: Some(Duration::from_millis(200)),
                })
                .collect(),
        )
        .with_mode(AnimationMode::PingPong);
        let animations = SpriteAnimations::new(maplit::hashmap!(
            Some("Idle".to_string()) => idle,
            Some("WalkLeft".to_string()) => walk_left,
            Some("WalkRight".to_string()) => walk_right,
        ));
        let mut sprite = Sprite::from(animations);
        sprite.set_current_tag(Some("Idle".to_string()))?;
        self.sprite = Some(sprite);

        Ok(())
    }

    fn update(
        &mut self,
        scene: &Target,
        status: &mut RedrawStatus,
        _window: WindowHandle,
    ) -> kludgine::Result<()> {
        let sprite = self.sprite.as_mut().unwrap();
        // Update the current frame.
        self.current_frame = Some(sprite.get_frame(scene.elapsed())?);
        // Tell the window when this sprite will need to redraw  new frame.
        if let Some(duration) = sprite.remaining_frame_duration()? {
            status.estimate_next_frame(duration);
        } else {
            status.set_needs_redraw();
        }

        Ok(())
    }

    fn render(
        &mut self,
        scene: &Target,
        _status: &mut RedrawStatus,
        _window: WindowHandle,
    ) -> kludgine::Result<()> {
        Shape::rect(Rect::new(Point::default(), scene.size()))
            .fill(Fill::new(Color::WHITE))
            .render(scene);

        let sprite = self.current_frame.as_ref().unwrap();
        let bounds = Rect::new(Point::default(), scene.size());

        sprite.render_at(scene, bounds.center(), SpriteRotation::none());

        Ok(())
    }
}