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//! Draw polygon

use types::Color;
use { types, triangulation, Graphics, DrawState };
use math::{ Matrix2d, Scalar };

/// A polygon
#[derive(Copy, Clone)]
pub struct Polygon {
    /// The color of the polygon
    pub color: Color,
}

impl Polygon {
    /// Creates new polygon
    pub fn new(color: Color) -> Polygon {
        Polygon {
            color: color,
        }
    }

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

    /// Draws polygon
    pub fn draw<G>(
        &self,
        polygon: types::Polygon,
        draw_state: &DrawState,
        transform: Matrix2d,
        g: &mut G
    )
        where G: Graphics
    {
        g.tri_list(
            draw_state,
            &self.color,
            |f|
        triangulation::with_polygon_tri_list(
            transform,
            polygon,
            |vertices| f(vertices)
        ));
    }

    /// Draws tweened polygon with linear interpolation
    pub fn draw_tween_lerp<G>(
        &self,
        polygons: types::Polygons,
        tween_factor: Scalar,
        draw_state: &DrawState,
        transform: Matrix2d,
        g: &mut G
    )
        where G: Graphics
    {
        if self.color[3] == 0.0 { return; }
        g.tri_list(
            draw_state,
            &self.color,
            |f|
        triangulation::with_lerp_polygons_tri_list(
            transform,
            polygons,
            tween_factor,
            |vertices| f(vertices)
        ));
    }
}

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

    #[test]
    fn test_polygon() {
        let _polygon = Polygon::new([1.0; 4])
            .color([0.0; 4]);
    }
}