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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 using the default method.
#[inline(always)]
pub fn draw<G>(&self,
polygon: types::Polygon,
draw_state: &DrawState,
transform: Matrix2d,
g: &mut G)
where G: Graphics
{
g.polygon(self, polygon, draw_state, transform);
}

/// Draws polygon using triangulation.
pub fn draw_tri<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, using default method.
#[inline(always)]
pub fn draw_tween_lerp<G>(&self,
polygons: types::Polygons,
tween_factor: Scalar,
draw_state: &DrawState,
transform: Matrix2d,
g: &mut G)
where G: Graphics
{
g.polygon_tween_lerp(self, polygons, tween_factor, draw_state, transform);
}

/// Draws tweened polygon with linear interpolation, using triangulation.
pub fn draw_tween_lerp_tri<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]);
}
}
```