souprune 0.5.1

A game framework designed specifically for Deltarune / Undertale fangames.
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

//! # systems.rs
//!
//! # systems.rs 文件
//!
//! ## Module Overview
//!
//! ## 模块概述
//!
//! Implements the system that updates the camera's position to track its `Followable` target, respecting any configured bounds.
//!
//! 实现更新相机位置以追踪其 `Followable` 目标的系统，并遵守任何配置的边界。

use super::components::Followable;
use bevy::prelude::*;

/// System set for camera updates. Collision systems should run before this.
///
/// 摄像机更新的系统集。碰撞系统应在此之前运行。
#[derive(SystemSet, Debug, Clone, PartialEq, Eq, Hash)]
pub struct CameraUpdateSet;

pub(crate) fn update_followable_camera_system(
    mut camera: Query<(&Followable, &mut Transform, &Camera)>,
    target: Query<&Transform, Without<Camera>>,
) {
    for (followable, mut transform, _) in camera.iter_mut() {
        if let Some(target_entity) = followable.target
            && let Ok(target_transform) = target.get(target_entity)
        {
            let mut new_x = target_transform.translation.x;
            let mut new_y = target_transform.translation.y;

            // Apply bounds if enabled and valid.
            // Invalid bounds (min >= max) can occur before tilemap loads.
            //
            // 如果启用了边界限制且边界有效，则应用边界限制。
            // 无效边界（min >= max）可能在tilemap加载前出现。
            if followable.bounds_enabled
                && followable.min_x < followable.max_x
                && followable.min_y < followable.max_y
            {
                new_x = new_x.clamp(followable.min_x, followable.max_x);
                new_y = new_y.clamp(followable.min_y, followable.max_y);
            }

            transform.translation.x = new_x;
            transform.translation.y = new_y;
        }
    }
}