freenukum 0.4.0

A clone of the 1991 DOS game Duke Nukem 1
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
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141

// SPDX-License-Identifier: AGPL-3.0-or-later
// SPDX-FileCopyrightText: Wolfgang Silbermayr <wolfgang@silbermayr.at>

use crate::{
    actor::{
        ActParameters, Actor, ActorExt, ActorType, CreateActorWithDetails,
        RenderParameters, ShotParameters, ShotProcessing,
        SingleAnimationType,
    },
    geometry::RectExt,
    level::{tiles::LevelTiles, BackgroundTileStrategy},
    HorizontalDirection, RangedIterator, Result, Sizes, ANIMATION_FAN,
};
use sdl2::rect::{Point, Rect};

#[derive(Debug)]
pub(crate) struct Fan {
    tile: usize,
    frame: RangedIterator,
    running: usize,
    position: Rect,
    direction: HorizontalDirection,
}

impl CreateActorWithDetails for Fan {
    type Details = HorizontalDirection;

    fn create_with_details(
        direction: HorizontalDirection,
        pos: Point,
        sizes: &dyn Sizes,
        _tiles: &mut LevelTiles,
    ) -> Actor {
        Actor::Fan(Self {
            tile: ANIMATION_FAN,
            frame: RangedIterator::new(4),
            running: 10,
            position: Rect::new(
                pos.x,
                pos.y - sizes.height() as i32,
                sizes.width(),
                sizes.height() * 2,
            ),
            direction,
        })
    }
}

impl ActorExt for Fan {
    fn act(&mut self, p: ActParameters) {
        match self.running {
            0 => {}
            1 => {
                self.frame.next();
            }
            2 => {}
            3 => {}
            4 => {}
            5 => {
                self.frame.next();
            }
            6 => {}
            7 => {}
            8 => {
                self.frame.next();
            }
            9 => {}
            10 => {
                self.frame.next();
            }
            _ => unreachable!(),
        }
        if self.running < 10 && self.running > 0 {
            self.running -= 1;
        } else if self.running == 10
            && p.hero.position.geometry.overlaps_vertically(self.position)
        {
            let mut hdistance = p
                .hero
                .position
                .geometry
                .horizontal_distance(self.position);

            let fan_direction = self.direction.as_factor_i32();

            if (fan_direction * hdistance) < 0 {
                return;
            }

            if hdistance == 0 {
                hdistance = p.sizes.half_width() as i32 * fan_direction;
            }

            let range = p.sizes.half_width() as i32 * 8;
            if hdistance.abs() < range {
                p.hero.position.push_horizontally(
                    p.sizes,
                    p.tiles,
                    fan_direction * p.sizes.width() as i32,
                );
            }
        }
    }

    fn render(&mut self, p: RenderParameters) -> Result<()> {
        let mut pos = self.position.top_left();
        p.renderer
            .place_tile(self.tile + self.frame.current() * 2, pos)?;
        pos.y += p.sizes.height() as i32;
        p.renderer
            .place_tile(self.tile + self.frame.current() * 2 + 1, pos)?;
        Ok(())
    }

    fn can_get_shot(&self) -> bool {
        true
    }

    fn shot(&mut self, p: ShotParameters) -> ShotProcessing {
        self.running = 9;
        p.game_commands.add_actor(
            ActorType::SingleAnimation(SingleAnimationType::Steam),
            self.position
                .top_left()
                .offset(0, -(p.sizes.height() as i32 / 2)),
        );
        ShotProcessing::Absorb
    }

    fn position(&self) -> Rect {
        self.position
    }

    fn is_in_foreground(&self) -> bool {
        true
    }

    fn background_tile_strategy(&self) -> BackgroundTileStrategy {
        BackgroundTileStrategy::CopyFromAbove
    }
}