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//! 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 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,
});
}
}