fpschecker/
fpschecker.rs

1use std::io;
2use std::io::stdout;
3use std::time::Instant;
4use teng::components::Component;
5use teng::rendering::pixel::Pixel;
6use teng::rendering::renderer::Renderer;
7use teng::{
8    install_panic_handler, terminal_cleanup, terminal_setup, Game, SharedState, UpdateInfo,
9};
10
11fn main() -> io::Result<()> {
12    terminal_setup()?;
13    install_panic_handler();
14
15    let mut game = Game::new(stdout());
16    game.install_recommended_components();
17    // game.add_component(Box::new(FpsCheckerComponent::new()));
18    game.add_component(Box::new(FpsCheckerFrameCountComponent::new()));
19    game.run()?;
20
21    terminal_cleanup()?;
22
23    Ok(())
24}
25
26/// Targets a movement speed of 144 pixels per second
27pub struct FpsCheckerFrameTimeComponent {
28    start_time: Instant,
29}
30
31impl FpsCheckerFrameTimeComponent {
32    pub fn new() -> Self {
33        Self {
34            start_time: Instant::now(),
35        }
36    }
37}
38
39impl Component for FpsCheckerFrameTimeComponent {
40    fn render(&self, renderer: &mut dyn Renderer, shared_state: &SharedState, depth_base: i32) {
41        // render a block at half height and x corresponding to the position at 144 blocks per second
42        let elapsed = Instant::now() - self.start_time;
43        let time_per_frame = 1.0 / 144.0;
44        let frame = (elapsed.as_secs_f64() / time_per_frame) as usize;
45        let y = shared_state.display_info.height() / 2;
46        // bounce x back and forth
47        let x = frame % (shared_state.display_info.width() * 2);
48        let pixel = Pixel::new('█');
49        if x < shared_state.display_info.width() {
50            renderer.render_pixel(x, y, pixel, i32::MAX);
51        } else {
52            renderer.render_pixel(
53                shared_state.display_info.width() * 2 - x - 1,
54                y,
55                pixel,
56                i32::MAX,
57            );
58        }
59    }
60}
61
62/// Movement speed is tied to framerate. Moves 1px/frame.
63pub struct FpsCheckerFrameCountComponent {
64    count: usize,
65}
66
67impl FpsCheckerFrameCountComponent {
68    pub fn new() -> Self {
69        Self { count: 0 }
70    }
71}
72
73impl Component for FpsCheckerFrameCountComponent {
74    fn update(&mut self, update_info: UpdateInfo, shared_state: &mut SharedState) {
75        self.count += 1;
76    }
77
78    fn render(&self, renderer: &mut dyn Renderer, shared_state: &SharedState, depth_base: i32) {
79        let y = shared_state.display_info.height() / 2;
80        // bounce x back and forth
81        let x = self.count % (shared_state.display_info.width() * 2);
82        let pixel = Pixel::new('█');
83        if x < shared_state.display_info.width() {
84            renderer.render_pixel(x, y, pixel, i32::MAX);
85        } else {
86            renderer.render_pixel(
87                shared_state.display_info.width() * 2 - x - 1,
88                y,
89                pixel,
90                i32::MAX,
91            );
92        }
93    }
94}
fpschecker/fpschecker.rs

fpschecker/
fpschecker.rs
