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

//! Draw ellipse

use types::{Color, Radius, Rectangle, Resolution};
use {triangulation, DrawState, Graphics};
use math::Matrix2d;

pub use rectangle::centered;
pub use rectangle::centered_square as circle;

/// Ellipse border
#[derive(Copy, Clone)]
pub struct Border {
    /// The border color
    pub color: Color,
    /// The border radius
    pub radius: Radius,
}

/// An ellipse with filled color
#[derive(Copy, Clone)]
pub struct Ellipse {
    /// The ellipse color
    pub color: Color,
    /// The ellipse border
    pub border: Option<Border>,
    /// The resolution for the shape, 360 degrees.
    pub resolution: Resolution,
}

impl Ellipse {
    /// Creates a new ellipse
    pub fn new(color: Color) -> Ellipse {
        Ellipse {
            color: color,
            border: None,
            resolution: 128,
        }
    }

    /// Creates a new ellipse border
    pub fn new_border(color: Color, radius: Radius) -> Ellipse {
        Ellipse {
            color: [0.0; 4],
            border: Some(Border {
                color: color,
                radius: radius,
            }),
            resolution: 128,
        }
    }

    /// Sets ellipse color.
    pub fn color(mut self, value: Color) -> Self {
        self.color = value;
        self
    }

    /// Sets ellipse border.
    pub fn border(mut self, value: Border) -> Self {
        self.border = Some(value);
        self
    }

    /// Sets optional ellipse border.
    pub fn maybe_border(mut self, value: Option<Border>) -> Self {
        self.border = value;
        self
    }

    /// Sets resolution of the ellipse smoothness.
    pub fn resolution(mut self, value: Resolution) -> Self {
        self.resolution = value;
        self
    }

    /// Draws ellipse by corners using default method.
    #[inline(always)]
    pub fn draw_from_to<P: Into<crate::types::Vec2d>, G>(&self,
                                       from: P,
                                       to: P,
                                       draw_state: &DrawState,
                                       transform: Matrix2d,
                                       g: &mut G)
        where G: Graphics
    {
        use rectangle::rectangle_by_corners;

        let from = from.into();
        let to = to.into();
        g.ellipse(self,
                  rectangle_by_corners(from[0], from[1], to[0], to[1]),
                  draw_state,
                  transform);
    }

    /// Draws ellipse using default method.
    #[inline(always)]
    pub fn draw<R: Into<Rectangle>, G>(&self,
                                       rectangle: R,
                                       draw_state: &DrawState,
                                       transform: Matrix2d,
                                       g: &mut G)
        where G: Graphics
    {
        g.ellipse(self, rectangle, draw_state, transform);
    }

    /// Draws ellipse using triangulation.
    pub fn draw_tri<R: Into<Rectangle>, G>(&self,
                                           rectangle: R,
                                           draw_state: &DrawState,
                                           transform: Matrix2d,
                                           g: &mut G)
        where G: Graphics
    {
        let rectangle = rectangle.into();
        g.tri_list(draw_state, &self.color, |f| {
            triangulation::with_ellipse_tri_list(self.resolution,
                                                 transform,
                                                 rectangle,
                                                 |vertices| f(vertices))
        });

        if let Some(Border { color, radius: border_radius }) = self.border {
            g.tri_list(&draw_state, &color, |f| {
                triangulation::with_ellipse_border_tri_list(self.resolution,
                                                            transform,
                                                            rectangle,
                                                            border_radius,
                                                            |vertices| f(vertices))
            });
        }
    }
}

#[cfg(test)]
mod test {
    use super::*;

    #[test]
    fn test_ellipse() {
        let _ellipse = Ellipse::new([1.0; 4])
            .color([0.0; 4])
            .border(Border {
                color: [1.0; 4],
                radius: 3.0,
            });
    }
}