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//! GPU-based 2D graphics rendering tools in Rust using path tessellation.
//!
//! 
//!
//! [](https://crates.io/crates/lyon)
//! [](https://travis-ci.org/nical/lyon)
//!
//! # Crates
//!
//! This meta-crate (`lyon`) reexports the following sub-crates for convenience:
//!
//! * [](https://crates.io/crates/lyon_tessellation)
//! [](https://docs.rs/lyon_tessellation) -
//! **lyon_tessellation** - Path tessellation routines.
//! * [](https://crates.io/crates/lyon_path)
//! [](https://docs.rs/lyon_path) -
//! **lyon_path** - Tools to build and iterate over paths.
//! * [](https://crates.io/crates/lyon_algorithms)
//! [](https://docs.rs/lyon_algorithms) -
//! **lyon_algorithms** - Various 2d path related algorithms.
//! * [](https://crates.io/crates/lyon_geom)
//! [](https://docs.rs/lyon_geom) -
//! **lyon_geom** - 2d utilities for cubic and quadratic bézier curves, arcs and more.
//! * [](https://crates.io/crates/lyon_svg)
//! [](https://docs.rs/lyon_svg) -
//! **lyon_svg** - Create paths using SVG's path syntax.
//! * [](https://crates.io/crates/lyon_extra)
//! [](https://docs.rs/lyon_extra) -
//! **lyon_extra** - Additional testing and debugging tools.
//! * [](https://crates.io/crates/lyon_tess2)
//! [](https://docs.rs/lyon_tess2) -
//! **lyon_tess2** - Alternative fill tessellation implementation using [libtess2](https://github.com/memononen/libtess2).
//!
//! Each `lyon_<name>` crate is reexported as a `<name>` module in `lyon`. For example:
//!
//! ```ignore
//! extern crate lyon_tessellation;
//! use lyon_tessellation::FillTessellator;
//! ```
//!
//! Is equivalent to:
//!
//! ```ignore
//! extern crate lyon;
//! use lyon::tessellation::FillTessellator;
//! ```
//!
//! # Feature flags
//!
//! serialization using serde can be enabled on each crate using the
//! `serialization` feature flag (disabled by default).
//!
//! When using the main crate `lyon`, the `lyon_svg`, `lyon_tess2` and
//! `lyon_extra` dependencies are disabled by default. They can be added
//! with the feature flags `svg`, `tess2` and `extra`.
//!
//! # Additional documentation and links
//!
//! * [very basic gfx-rs example](https://github.com/nical/lyon/tree/master/examples/gfx_basic).
//! * [advanced gfx-rs example](https://github.com/nical/lyon/tree/master/examples/gfx_advanced).
//! * There is some useful documentation on the project's [wiki](https://github.com/nical/lyon/wiki).
//! * The source code is available on the project's [git repository](https://github.com/nical/lyon).
//! * Interested in contributing? Pull requests are welcome. If you would like to help but don't know
//! what to do specifically, have a look at the [github issues](https://github.com/nical/lyon/issues),
//! some of which are tagged as [easy](https://github.com/nical/lyon/issues?q=is%3Aissue+is%3Aopen+label%3Aeasy).
//!
//! # Examples
//!
//! ## Tessellating a rounded rectangle
//!
//! The `lyon_tessellation` crate provides a collection of tessellation routines
//! for common shapes such as rectangles and circles. Let's have a look at how
//! to obtain the fill tessellation a rectangle with rounded corners:
//!
//! ```
//! use lyon::math::rect;
//! use lyon::tessellation::{VertexBuffers, FillOptions, FillVertex};
//! use lyon::tessellation::basic_shapes::*;
//! use lyon::tessellation::geometry_builder::simple_builder;
//!
//! fn main() {
//! let mut geometry: VertexBuffers<FillVertex, u16> = VertexBuffers::new();
//!
//! let options = FillOptions::tolerance(0.1);
//!
//! fill_rounded_rectangle(
//! &rect(0.0, 0.0, 100.0, 50.0),
//! &BorderRadii {
//! top_left: 10.0,
//! top_right: 5.0,
//! bottom_left: 20.0,
//! bottom_right: 25.0,
//! },
//! &options,
//! &mut simple_builder(&mut geometry),
//! );
//!
//! // The tessellated geometry is ready to be uploaded to the GPU.
//! println!(" -- {} vertices {} indices",
//! geometry.vertices.len(),
//! geometry.indices.len()
//! );
//! }
//!
//! ```
//!
//! ## Building and tessellating an arbitrary path
//!
//! ```
//! extern crate lyon;
//! use lyon::math::point;
//! use lyon::path::Path;
//! use lyon::path::builder::*;
//! use lyon::tessellation::*;
//!
//! fn main() {
//! // Build a Path.
//! let mut builder = Path::builder();
//! builder.move_to(point(0.0, 0.0));
//! builder.line_to(point(1.0, 0.0));
//! builder.quadratic_bezier_to(point(2.0, 0.0), point(2.0, 1.0));
//! builder.cubic_bezier_to(point(1.0, 1.0), point(0.0, 1.0), point(0.0, 0.0));
//! builder.close();
//! let path = builder.build();
//!
//! // Let's use our own custom vertex type instead of the default one.
//! #[derive(Copy, Clone, Debug)]
//! struct MyVertex { position: [f32; 2], normal: [f32; 2] };
//!
//! // Will contain the result of the tessellation.
//! let mut geometry: VertexBuffers<MyVertex, u16> = VertexBuffers::new();
//!
//! let mut tessellator = FillTessellator::new();
//!
//! {
//! // Compute the tessellation.
//! tessellator.tessellate_path(
//! &path,
//! &FillOptions::default(),
//! &mut BuffersBuilder::new(&mut geometry, |vertex : FillVertex| {
//! MyVertex {
//! position: vertex.position.to_array(),
//! normal: vertex.normal.to_array(),
//! }
//! }),
//! ).unwrap();
//! }
//!
//! // The tessellated geometry is ready to be uploaded to the GPU.
//! println!(" -- {} vertices {} indices",
//! geometry.vertices.len(),
//! geometry.indices.len()
//! );
//! }
//! ```
//!
//! ## What is the tolerance variable in these examples?
//!
//! The tessellator operates on flattened paths (that only contains line segments)
//! so we have to approximate the curves segments with sequences of line segments.
//! To do so we pick a tolerance threshold which is the maximum distance allowed
//! between the curve and its approximation.
//! The documentation of the [lyon_geom](https://docs.rs/lyon_geom) crate provides
//! more detailed explanations about this tolerance parameter.
//!
//! ## Rendering the tessellated geometry
//!
//! Lyon does not provide with any GPU abstraction or rendering backend (for now).
//! It is up to the user of this crate to decide whether to use OpenGL, vulkan, gfx-rs,
//! glium, or any low level graphics API and how to render it.
//! The [basic](https://github.com/nical/lyon/tree/master/examples/gfx_basic) and
//! [advanced](https://github.com/nical/lyon/tree/master/examples/gfx_advanced) gfx-rs
//! examples can be used to get an idea of how to render the geometry (in this case
//! using gfx-rs).
//!
pub extern crate lyon_tessellation;
pub extern crate lyon_algorithms;
pub extern crate lyon_extra;
pub extern crate lyon_svg;
pub extern crate lyon_tess2;
pub use lyon_tessellation as tessellation;
pub use lyon_algorithms as algorithms;
pub use path as path;
pub use geom as geom;
pub use lyon_svg as svg;
pub use lyon_extra as extra;
pub use lyon_tess2 as tess2;
pub use math;