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

use line::Line;
use Canvas;
use Drawable;

bitflags! {
    /// The Sides bitflag presents the sides of a rectangle
    pub struct Sides: u32 {
        /// The top side of the rectangle
        const TOP = 0b0001;
        /// The bottom side of the rectangle
        const BOTTOM = 0b0010;
        /// The left side of the rectangle
        const LEFT = 0b0100;
        /// The right side of the rectangle
        const RIGHT = 0b1000;
        /// All sides of the rectangle
        const ALL = Self::TOP.bits | Self::BOTTOM.bits | Self::LEFT.bits | Self::RIGHT.bits;
    }
}

/// A drawable object that represents a rectangle
pub struct Rectangle {
    /// Position of the top-left corner of rectangle
    pub pos: (usize, usize),
    /// The size of the rectangle to be drawn, the border will be contained within this size
    pub size: (usize, usize),
    /// The border that is drawn around the perimeter of the rectangle. It's arguments are
    /// thickness of border, color of border, sides that the border is drawn around, rounding size
    /// of the corners
    pub border: Option<(usize, [u8; 4], Sides, Option<usize>)>,
    /// The color of the fill (area) of the rectangle
    pub fill: Option<[u8; 4]>,
}

impl Rectangle {
    /// Creates a new Rectangle object
    pub fn new(
        pos: (usize, usize),
        size: (usize, usize),
        border: Option<(usize, [u8; 4], Sides, Option<usize>)>,
        fill: Option<[u8; 4]>,
    ) -> Rectangle {
        Rectangle {
            pos,
            size,
            border,
            fill,
        }
    }

    fn draw_borders(&self, canvas: &mut Canvas) {
        if let Some(border) = self.border {
            for i in 0..border.0 {
                let rounding_space = if let Some(round_size) = border.3 {
                    if i < round_size {
                        round_size
                            - ((round_size as f32).powi(2) - ((round_size - i - 1) as f32).powi(2))
                                .sqrt()
                                .round() as usize
                    } else {
                        0
                    }
                } else {
                    0
                };

                // Top line
                if border.2.contains(Sides::TOP) && canvas.width > rounding_space * 2 {
                    Line::new(
                        (self.pos.0 + rounding_space, self.pos.1 + i),
                        (self.pos.0 + self.size.0 - rounding_space, self.pos.1 + i),
                        border.1,
                        false,
                    )
                    .draw(canvas);
                }
                // Bottom line
                if border.2.contains(Sides::BOTTOM) && canvas.width > rounding_space * 2 {
                    Line::new(
                        (self.pos.0 + rounding_space, self.pos.1 + self.size.1 - i),
                        (
                            self.pos.0 + self.size.0 - rounding_space,
                            self.pos.1 + self.size.1 - i,
                        ),
                        border.1,
                        false,
                    )
                    .draw(canvas);
                }
                // Left line
                if border.2.contains(Sides::LEFT) && canvas.height > rounding_space * 2 {
                    Line::new(
                        (self.pos.0 + i, self.pos.1 + rounding_space),
                        (self.pos.0 + i, self.pos.1 + self.size.1 - rounding_space),
                        border.1,
                        false,
                    )
                    .draw(canvas);
                }
                // Right line
                if border.2.contains(Sides::RIGHT) && canvas.height > rounding_space * 2 {
                    Line::new(
                        (self.pos.0 + self.size.0 - i, self.pos.1 + rounding_space),
                        (
                            self.pos.0 + self.size.0 - i,
                            self.pos.1 + self.size.1 - rounding_space,
                        ),
                        border.1,
                        false,
                    )
                    .draw(canvas);
                }
            }
        }
    }

    fn draw_area(&self, canvas: &mut Canvas) {
        if let Some(fill) = self.fill {
            let (area_pos, area_size) = self.measure_area();
            for y in area_pos.1..area_pos.1 + area_size.1 + 1 {
                Line::new((area_pos.0, y), (area_pos.0 + area_size.0, y), fill, false).draw(canvas)
            }
        }
    }

    fn measure_area(&self) -> ((usize, usize), (usize, usize)) {
        let (mut area_pos, mut area_size) = (self.pos, self.size);
        if let Some(border) = self.border {
            if border.2.contains(Sides::TOP) {
                area_pos.1 += border.0;
                area_size.1 -= border.0;
            }
            if border.2.contains(Sides::BOTTOM) {
                area_size.1 -= border.0;
            }
            if border.2.contains(Sides::LEFT) {
                area_pos.0 += border.0;
                area_size.0 -= border.0;
            }
            if border.2.contains(Sides::RIGHT) {
                area_size.0 -= border.0;
            }
        }
        (area_pos, area_size)
    }
}

impl Drawable for Rectangle {
    fn draw(&self, canvas: &mut Canvas) {
        self.draw_borders(canvas);
        self.draw_area(canvas);
    }
}