piston2d-graphics 0.45.0

A library for 2D graphics that works with multiple back-ends
Documentation 
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//! Draw ellipse

pub use crate::rectangle::{centered, centered_square as circle};
use crate::{
    math::Matrix2d,
    triangulation,
    types::{Color, Radius, Rectangle, Resolution},
    DrawState, Graphics,
};

/// 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,
            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, 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 crate::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,
        });
    }
}