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//! Draw an arc
use {triangulation, DrawState, Graphics};
use math::Matrix2d;
use types::{Color, Radius, Rectangle, Resolution, Scalar};
/// A curved line
#[derive(Copy, Clone)]
pub struct CircleArc {
/// The arcs color
pub color: Color,
/// The radius of the arc (Thickness of the drawing, not the radius of the circle)
pub radius: Radius,
/// The start of the arc in radians
pub start: Scalar,
/// The end of the arc in radians
pub end: Scalar,
/// The resolution for the arc.
pub resolution: Resolution,
}
impl CircleArc {
/// Creates a new arc
pub fn new(color: Color, radius: Radius, start: Scalar, end: Scalar) -> CircleArc {
CircleArc {
color: color,
radius: radius,
start: start,
end: end,
resolution: 128,
}
}
/// Sets the arcs color.
pub fn color(mut self, value: Color) -> Self {
self.color = value;
self
}
/// Sets the radius of the arc (Thickness of the arc, not the radius of the circle it wraps)
pub fn radius(mut self, value: Radius) -> Self {
self.radius = value;
self
}
/// Sets the start of the arc (in radians).
pub fn start(mut self, value: Scalar) -> Self {
self.start = value;
self
}
/// Sets the end of the arc (in radians).
pub fn end(mut self, value: Scalar) -> Self {
self.end = value;
self
}
/// Sets the resolution of the arcs smoothness.
pub fn resolution(mut self, value: Resolution) -> Self {
self.resolution = value;
self
}
/// Draws circle arc 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.circle_arc(self, rectangle, draw_state, transform);
}
/// Draws circle arc 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_arc_tri_list(self.start,
self.end,
self.resolution,
transform,
rectangle,
self.radius,
|vertices| f(vertices))
});
}
}
#[cfg(test)]
mod test {
use super::*;
use radians::Radians;
use types::Scalar;
#[test]
fn test_circle_arc() {
let _arc = CircleArc::new([1.0; 4], 4.0, 0.0, Radians::_180())
.color([0.0; 4])
.radius(4.0)
.start(<Scalar as Radians>::_180() * 0.25)
.end(<Scalar as Radians>::_180() * 1.25);
}
}