teng 0.5.0

A basic game engine for the terminal
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55

use crate::{BreakingAction, Component, SetupInfo, SharedState, UpdateInfo};
use crossterm::event::{Event, MouseEventKind};

/// A component that locks the FPS to a certain value.
///
/// Press 'l' to toggle the lock, and scroll up/down to change the target FPS.
pub struct FpsLockerComponent {
    locked: bool,
    default_fps: f64,
}

impl FpsLockerComponent {
    pub fn new(default_fps: f64) -> Self {
        Self {
            locked: true,
            default_fps,
        }
    }
}

impl<S> Component<S> for FpsLockerComponent {
    fn setup(&mut self, setup_info: &SetupInfo, shared_state: &mut SharedState<S>) {
        shared_state.target_fps = Some(self.default_fps);
    }

    fn on_event(
        &mut self,
        event: Event,
        shared_state: &mut SharedState<S>,
    ) -> Option<BreakingAction> {
        match event {
            Event::Mouse(me) => match me.kind {
                MouseEventKind::ScrollDown => {
                    self.default_fps -= 1.0;
                    if self.default_fps < 1.0 {
                        self.default_fps = 1.0;
                    }
                }
                MouseEventKind::ScrollUp => {
                    self.default_fps += 1.0;
                }
                _ => {}
            },
            _ => {}
        }
        None
    }

    fn update(&mut self, update_info: UpdateInfo, shared_state: &mut SharedState<S>) {
        if shared_state.pressed_keys.did_press_char_ignore_case('l') {
            self.locked = !self.locked;
        }
        shared_state.target_fps = self.locked.then_some(self.default_fps);
    }
}