chiro 0.1.3

A curses-style terminal view that runs inside a pixel buffer (Rewrite of chiropterm)
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
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208

use enum_map::{EnumMap};

use crate::{shared::{At, ToZel, build_rect}, Drawable};

use super::{BoxSide, charset::box_char};

#[derive(Clone, Copy, PartialEq, Eq)]
pub enum Border { Single, Double, }

#[derive(Clone, Copy, Default)]
pub struct BoxSettings {
    borders: EnumMap<BoxSide, Border>
} 

impl Default for Border {
    fn default() -> Self { Border::Single }
}

impl BoxSettings {
    pub fn single() -> BoxSettings {
        BoxSettings::default()
    }

    pub fn double() -> BoxSettings {
        let mut settings = BoxSettings::default();

        settings.borders[BoxSide::Top] = Border::Double;
        settings.borders[BoxSide::Bottom] = Border::Double;
        settings.borders[BoxSide::Left] = Border::Double;
        settings.borders[BoxSide::Right] = Border::Double;

        settings
    }

    pub fn double_top(mut self) -> BoxSettings { self.borders[BoxSide::Top] = Border::Double; self }
    pub fn double_bottom(mut self) -> BoxSettings { self.borders[BoxSide::Bottom] = Border::Double; self }
    pub fn double_left(mut self) -> BoxSettings { self.borders[BoxSide::Left] = Border::Double; self }
    pub fn double_right(mut self) -> BoxSettings { self.borders[BoxSide::Right] = Border::Double; self }

    pub fn single_top(mut self) -> BoxSettings { self.borders[BoxSide::Top] = Border::Single; self }
    pub fn single_bottom(mut self) -> BoxSettings { self.borders[BoxSide::Bottom] = Border::Single; self }
    pub fn single_left(mut self) -> BoxSettings { self.borders[BoxSide::Left] = Border::Single; self }
    pub fn single_right(mut self) -> BoxSettings { self.borders[BoxSide::Right] = Border::Single; self }
}


pub(crate) fn draw_box(cursor: &At<impl Drawable>, top: impl ToZel, bot: impl ToZel, settings: BoxSettings) {
    let font = cursor.get_font();
    let sz = font.char_size();
    let sz_x = sz.width as i32;
    let sz_y = sz.height as i32;

    let mut top = top.to_zel();
    let mut bot = bot.to_zel();
    top.x /= sz_x;
    top.y /= sz_y;
    bot.x /= sz_x;
    bot.y /= sz_y;

    let r = build_rect(top, bot);

    // inclusive, because it simplifies some math
    let (x0, y0, x1, y1) = (r.min_x(), r.min_y(), r.max_x() - 1, r.max_y() - 1);

    if r.size.width <= 1 {
        let use_double = 
            settings.borders[BoxSide::Left] == Border::Double ||
            settings.borders[BoxSide::Right] == Border::Double;

        let mut up_crumb: u8 = 0b01_00_00_00;
        let mut down_crumb: u8 = 0b00_00_01_00;
        if use_double {
            up_crumb |= up_crumb << 1;
            down_crumb |= down_crumb << 1;
        }

        draw_vertical_line(
            &cursor, 
            x0, y0, y1,
            down_crumb, down_crumb | up_crumb, up_crumb
        );
        return;
    }

    if r.size.height <= 1 {
        let use_double = 
            settings.borders[BoxSide::Top] == Border::Double ||
            settings.borders[BoxSide::Bottom] == Border::Double;

        let mut left_crumb: u8 = 0b00_00_00_01;
        let mut right_crumb: u8 = 0b00_01_00_00;
        if use_double {
            left_crumb |= left_crumb << 1;
            right_crumb |= right_crumb << 1;
        }
        draw_horizontal_line(
            &cursor, 
            y0, x0, x1, 
            right_crumb, right_crumb | left_crumb, left_crumb
        );
        return;
    }

    let use_double_left = settings.borders[BoxSide::Left] == Border::Double;
    let use_double_right = settings.borders[BoxSide::Right] == Border::Double;
    let use_double_up = settings.borders[BoxSide::Top] == Border::Double;
    let use_double_down = settings.borders[BoxSide::Bottom] == Border::Double;

    // draw left border
    {
        let mut middle: u8 = 0b01_00_01_00;
        if use_double_left { middle |= middle << 1 }

        draw_vertical_line(
            &cursor, 
            x0, y0, y1,
            0, middle, 0,
        );
    }

    // draw right border
    {
        let mut middle: u8 = 0b01_00_01_00;
        if use_double_right { middle |= middle << 1 }

        draw_vertical_line(
            &cursor, 
            x1, y0, y1,
            0, middle, 0,
        );
    }

    // draw top border
    {
        let mut middle: u8 = 0b00_01_00_01;
        if use_double_up { middle |= middle << 1 }

        draw_horizontal_line(
            &cursor, 
            y0, x0, x1, 
            0, middle, 0,
        );
    }

    // draw bottom border
    {
        let mut middle: u8 = 0b00_01_00_01;
        if use_double_down { middle |= middle << 1 }

        draw_horizontal_line(
            &cursor, 
            y1, x0, x1,
            0, middle, 0,
        );
    }

    // draw corners
    let mut ul = 0b00_00_00_00;
    ul |= if use_double_left { 0b00_00_11_00 } else { 0b00_00_01_00 };
    ul |= if use_double_up { 0b00_11_00_00 } else { 0b00_01_00_00 };
    draw_box_char(&cursor, (x0, y0), ul);

    let mut ur = 0b00_00_00_00;
    ur |= if use_double_right { 0b00_00_11_00 } else { 0b00_00_01_00 };
    ur |= if use_double_up { 0b00_00_00_11 } else { 0b00_00_00_01 };
    draw_box_char(&cursor, (x1, y0), ur);

    let mut dl = 0b00_00_00_00;
    dl |= if use_double_left { 0b11_00_00_00 } else { 0b01_00_00_00 };
    dl |= if use_double_down { 0b00_11_00_00 } else { 0b00_01_00_00 };
    draw_box_char(&cursor, (x0, y1), dl);

    let mut dr = 0b00_00_00_00;
    dr |= if use_double_right { 0b11_00_00_00 } else { 0b01_00_00_00 };
    dr |= if use_double_down { 0b00_00_00_11 } else { 0b00_00_00_01 };
    draw_box_char(&cursor, (x1, y1), dr);
}


fn draw_vertical_line(cursor: &At<impl Drawable>, x: i32, min_y: i32, max_y: i32, cap_top: u8, middle: u8, cap_bot: u8) {
    draw_box_char(cursor, (x, min_y), cap_top);
    if max_y <= min_y { return; }
    draw_box_char(cursor, (x, max_y), cap_bot);

    for y in min_y + 1..= max_y - 1 {
        draw_box_char(cursor, (x, y), middle);
    }
}


fn draw_horizontal_line(cursor: &At<impl Drawable>, y: i32, min_x: i32, max_x: i32, cap_left: u8, middle: u8, cap_right: u8) {
    draw_box_char(cursor, (min_x, y), cap_left);
    if max_x <= min_x { return; }
    draw_box_char(cursor, (max_x, y), cap_right);

    for x in min_x + 1..=max_x - 1 {
        draw_box_char(cursor, (x, y), middle);
    }
}


fn draw_box_char(cursor: &At<impl Drawable>, (x, y): (i32, i32), c: u8) {
    let font = cursor.get_font();
    let (sz_x, sz_y) = font.char_size().to_tuple();
    if let Some(bc) = box_char(c) {
        cursor.shifted((x * sz_x as i32, y * sz_y as i32)).put(bc);
    }
}