drawing 0.3.3

API for 2D graphics library
Documentation 
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// unknown units - doesn't matter what it is as long as the transform matrix to/from something else is provided
pub type Thickness = euclid::Length<f32, euclid::UnknownUnit>;
pub type Point = euclid::Point2D<f32, euclid::UnknownUnit>;
pub type Size = euclid::Size2D<f32, euclid::UnknownUnit>;
pub type Rect = euclid::Rect<f32, euclid::UnknownUnit>;

// backend specific unit (for example in range -1.0 .. 1.0 for OpenGL and Direct3D)
#[derive(Hash, Clone, Copy, Debug, Eq, PartialEq, Ord, PartialOrd)]
pub struct DeviceUnit;

pub type DeviceThickness = euclid::Length<f32, DeviceUnit>;
pub type DevicePoint = euclid::Point2D<f32, DeviceUnit>;
pub type DeviceSize = euclid::Size2D<f32, DeviceUnit>;
pub type DeviceRect = euclid::Rect<f32, DeviceUnit>;

// physical pixel (in range 0 .. window width - 1, 0 .. window height - 1)
#[derive(Hash, Clone, Copy, Debug, Eq, PartialEq, Ord, PartialOrd)]
pub struct PixelUnit;

pub type PixelThickness = euclid::Length<f32, PixelUnit>;
pub type PixelPoint = euclid::Point2D<f32, PixelUnit>;
pub type PixelSize = euclid::Size2D<f32, PixelUnit>;
pub type PixelRect = euclid::Rect<f32, PixelUnit>;

// user pixel (usually the same as physical pixel but user may be able to change it with DPI preferences)
#[derive(Hash, Clone, Copy, Debug, Eq, PartialEq, Ord, PartialOrd)]
pub struct UserPixelUnit;

pub type UserPixelThickness = euclid::Length<f32, UserPixelUnit>;
pub type UserPixelPoint = euclid::Point2D<f32, UserPixelUnit>;
pub type UserPixelSize = euclid::Size2D<f32, UserPixelUnit>;
pub type UserPixelRect = euclid::Rect<f32, UserPixelUnit>;

pub type UnknownToDeviceTransform = euclid::Transform2D<f32, euclid::UnknownUnit, DeviceUnit>;
pub type DeviceTransform = euclid::Transform2D<f32, DeviceUnit, DeviceUnit>;
pub type PixelTransform = euclid::Transform2D<f32, PixelUnit, PixelUnit>;
pub type UserPixelTransform = euclid::Transform2D<f32, UserPixelUnit, UserPixelUnit>;
pub type UserPixelToPixelTransform = euclid::Transform2D<f32, UserPixelUnit, PixelUnit>;
pub type UserPixelToDeviceTransform = euclid::Transform2D<f32, UserPixelUnit, DeviceUnit>;
pub type PixelToDeviceTransform = euclid::Transform2D<f32, PixelUnit, DeviceUnit>;