dessin 0.8.23

Build complex drawing for PDF, SVG, Images or Dioxus
Documentation 
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use crate::{
	prelude::{Ellipse, Shape, ShapeOp},
	shapes::{Bezier, Curve, Keypoint},
};
use nalgebra::{self as na, Point2, Rotation2, Scale2, Transform2};
use std::f32::consts::FRAC_PI_2;

/// Circle with a radius
#[derive(Default, Debug, Clone, PartialEq, Shape)]
pub struct Circle {
	/// [`ShapeOp`]
	#[local_transform]
	pub local_transform: Transform2<f32>,
}

impl Circle {
	/// Radius
	#[inline]
	pub fn radius(&mut self, radius: f32) -> &mut Self {
		self.scale(Scale2::new(2. * radius, 2. * radius));
		self
	}

	/// Radius
	#[inline]
	pub fn with_radius(mut self, radius: f32) -> Self {
		self.radius(radius);
		self
	}
}

impl From<Circle> for Shape {
	#[inline]
	fn from(Circle { local_transform }: Circle) -> Self {
		Shape::Ellipse(Ellipse { local_transform })
	}
}

impl From<Circle> for Curve {
	#[inline]
	fn from(Circle { local_transform }: Circle) -> Self {
		let mut q1 = Bezier {
			start: None,
			start_control: Point2::new(0.5, 0.552284749831 / 2.),
			end_control: Point2::new(0.552284749831 / 2., 0.5),
			end: Point2::new(0., 0.5),
		};
		let q2 = q1.transform(&na::convert(Rotation2::new(FRAC_PI_2)));
		let q3 = q2.transform(&na::convert(Rotation2::new(FRAC_PI_2)));
		let q4 = q3.transform(&na::convert(Rotation2::new(FRAC_PI_2)));

		q1.start = Some(Point2::new(0.5, 0.));

		Curve {
			keypoints: vec![
				Keypoint::Bezier(q1),
				Keypoint::Bezier(q2),
				Keypoint::Bezier(q3),
				Keypoint::Bezier(q4),
			],
			local_transform,
			closed: true,
		}
	}
}

impl From<Ellipse> for Circle {
	#[inline]
	fn from(Ellipse { local_transform }: Ellipse) -> Self {
		Circle { local_transform }
	}
}

impl From<Circle> for Ellipse {
	#[inline]
	fn from(Circle { local_transform }: Circle) -> Self {
		Ellipse { local_transform }
	}
}

#[test]
pub fn bounding_box() {
	use crate::prelude::*;
	use assert_float_eq::*;
	use std::f32::consts::FRAC_PI_4;

	let circle: Shape = Circle::default().with_radius(10.).into();

	let bb = circle.local_bounding_box();
	assert_eq!(bb.width(), 20.);
	assert_eq!(bb.height(), 20.);

	let mut ellipse = circle.with_resize(Scale2::new(2., 0.5));
	let bb = ellipse.local_bounding_box();
	assert_eq!(bb.width(), 40.);
	assert_eq!(bb.height(), 10.);

	ellipse.rotate(Rotation2::new(FRAC_PI_2));
	let bb = ellipse.local_bounding_box();
	assert_eq!(bb.width(), 40.);
	assert_eq!(bb.height(), 10.);
	let bb = bb.straigthen();
	assert_float_absolute_eq!(bb.width(), 10., 10e-3);
	assert_float_absolute_eq!(bb.height(), 40., 10e-3);

	ellipse.rotate(Rotation2::new(-FRAC_PI_4));
	let bb = ellipse.local_bounding_box();
	assert_eq!(bb.width(), 40.);
	assert_eq!(bb.height(), 10.);
	let bb = bb.straigthen();
	assert_float_absolute_eq!(bb.width(), 35., 10.); // Good enought for now
	assert_float_absolute_eq!(bb.height(), 35., 10.); // Good enought for now
}

#[test]
pub fn bounding_box_7() {
	use crate::prelude::*;

	let circle: Shape = Circle::default().with_radius(7.).into();

	let bb = circle.local_bounding_box();
	assert_eq!(bb.width(), 14.);
	assert_eq!(bb.height(), 14.);

	let group = dessin!([Circle(radius = 7.),]);
	let bb = group.local_bounding_box();
	assert_eq!(bb.width(), 14.);
	assert_eq!(bb.height(), 14.);
}