specs_camera 0.3.6

camera 2d and 3d component for specs
Documentation 
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extern crate num_traits;
extern crate specs;
extern crate specs_bundler;
extern crate specs_camera;
extern crate specs_transform;

use num_traits::{Float, FromPrimitive};
use specs::{DispatcherBuilder, Join, System, World, WriteStorage};
use specs_bundler::SpecsBundler;
use specs_camera::{
    Camera2D, Camera2DBundle, Camera2DSystem, Camera3D, Camera3DBundle, Camera3DSystem,
    CameraBundle, CameraSystem,
};
use specs_transform::{
    LocalTransform2D, LocalTransform3D, Transform2D, Transform2DBundle, Transform3D,
    Transform3DBundle, TransformBundle,
};

use std::marker::PhantomData;

#[derive(Default)]
pub struct Test2DSystem<T>(PhantomData<T>);

impl<'a, T> System<'a> for Test2DSystem<T>
where
    T: 'static + Sync + Send + Float + FromPrimitive,
{
    type SystemData = (WriteStorage<'a, LocalTransform2D<T>>,);

    fn run(&mut self, mut locals_2d: Self::SystemData) {
        for local in (&mut locals_2d.0).join() {
            local.position[0] = T::from_f32(1.0).unwrap();
            local.position[1] = T::from_f32(1.0).unwrap();
        }
    }
}

#[derive(Default)]
pub struct Test3DSystem<T>(PhantomData<T>);

impl<'a, T> System<'a> for Test3DSystem<T>
where
    T: 'static + Sync + Send + Float + FromPrimitive,
{
    type SystemData = (WriteStorage<'a, LocalTransform3D<T>>,);

    fn run(&mut self, mut locals_3d: Self::SystemData) {
        for local in (&mut locals_3d.0).join() {
            local.position[0] = T::from_f32(1.0).unwrap();
            local.position[1] = T::from_f32(1.0).unwrap();
            local.position[2] = T::from_f32(1.0).unwrap();
        }
    }
}

#[derive(Default)]
pub struct TestSystem<T>(PhantomData<T>);

impl<'a, T> System<'a> for TestSystem<T>
where
    T: 'static + Sync + Send + Float + FromPrimitive,
{
    type SystemData = (
        WriteStorage<'a, LocalTransform2D<T>>,
        WriteStorage<'a, LocalTransform3D<T>>,
    );

    fn run(&mut self, (mut locals_2d, mut locals_3d): Self::SystemData) {
        for local in (&mut locals_2d).join() {
            local.position[0] = T::from_f32(1.0).unwrap();
            local.position[1] = T::from_f32(1.0).unwrap();
        }
        for local in (&mut locals_3d).join() {
            local.position[0] = T::from_f32(1.0).unwrap();
            local.position[1] = T::from_f32(1.0).unwrap();
            local.position[2] = T::from_f32(1.0).unwrap();
        }
    }
}

#[test]
fn test_camera_2d() {
    let mut world = World::new();

    let mut dispatcher = SpecsBundler::new(&mut world, DispatcherBuilder::new())
        .bundle(Transform2DBundle::<f32>::new())
        .unwrap()
        .bundle(Camera2DBundle::<f32>::new(1024_usize, 768_usize))
        .unwrap()
        .with(
            Test2DSystem::<f32>::default(),
            "test_system",
            &[Camera2DSystem::<f32>::name()],
        )
        .build();

    world
        .create_entity()
        .with(LocalTransform2D::<f32>::new())
        .with(Transform2D::<f32>::new())
        .with(Camera2D::<f32>::new())
        .build();

    dispatcher.dispatch(&mut world.res); // first frame init
    dispatcher.dispatch(&mut world.res);

    let globals = world.read_storage::<Camera2D<f32>>();

    for global in (&globals).join() {
        assert_eq!(global.view(), &[1.0, 0.0, 0.0, 1.0, -1.0, -1.0]);
        assert_eq!(global.projection(), &[0.375, 0.0, 0.0, 0.5, 0.0, 0.0]);
    }
}

#[test]
fn test_camera_3d() {
    let mut world = World::new();

    let mut dispatcher = SpecsBundler::new(&mut world, DispatcherBuilder::new())
        .bundle(Transform3DBundle::<f32>::new())
        .unwrap()
        .bundle(Camera3DBundle::<f32>::new(1024_usize, 768_usize))
        .unwrap()
        .with(
            Test3DSystem::<f32>::default(),
            "test_system",
            &[Camera3DSystem::<f32>::name()],
        )
        .build();

    world
        .create_entity()
        .with(LocalTransform3D::<f32>::new())
        .with(Transform3D::<f32>::new())
        .with(Camera3D::<f32>::new())
        .build();

    dispatcher.dispatch(&mut world.res); // first frame init
    dispatcher.dispatch(&mut world.res);

    let globals = world.read_storage::<Camera3D<f32>>();

    for global in (&globals).join() {
        assert_eq!(
            global.view(),
            &[1.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, -1.0, -1.0, -1.0, 1.0]
        );
        assert_eq!(
            global.projection(),
            &[
                -0.16869165,
                0.0,
                0.0,
                0.0,
                0.0,
                -0.22492221,
                0.0,
                0.0,
                0.0,
                0.0,
                -1.0,
                -1.0,
                0.0,
                0.0,
                -<f32 as Float>::epsilon() * 2.0,
                0.0
            ]
        );
    }
}

#[test]
fn test_camera_2d_transform_3d() {
    let mut world = World::new();

    let mut dispatcher = SpecsBundler::new(&mut world, DispatcherBuilder::new())
        .bundle(TransformBundle::<f32>::new())
        .unwrap()
        .bundle(CameraBundle::<f32>::new(1024_usize, 768_usize))
        .unwrap()
        .with(
            TestSystem::<f32>::default(),
            "test_system",
            &[CameraSystem::<f32>::name()],
        )
        .build();

    world
        .create_entity()
        .with(LocalTransform3D::<f32>::new())
        .with(Transform3D::<f32>::new())
        .with(Camera2D::<f32>::new())
        .build();

    dispatcher.dispatch(&mut world.res); // first frame init
    dispatcher.dispatch(&mut world.res);

    let globals = world.read_storage::<Camera2D<f32>>();

    for global in (&globals).join() {
        assert_eq!(global.view(), &[1.0, 0.0, 0.0, 1.0, -1.0, -1.0]);
        assert_eq!(global.projection(), &[0.375, 0.0, 0.0, 0.5, 0.0, 0.0]);
    }
}

#[test]
fn test_camera_3d_transform_2d() {
    let mut world = World::new();

    let mut dispatcher = SpecsBundler::new(&mut world, DispatcherBuilder::new())
        .bundle(TransformBundle::<f32>::new())
        .unwrap()
        .bundle(CameraBundle::<f32>::new(1024_usize, 768_usize))
        .unwrap()
        .with(
            TestSystem::<f32>::default(),
            "test_system",
            &[CameraSystem::<f32>::name()],
        )
        .build();

    world
        .create_entity()
        .with(LocalTransform2D::<f32>::new())
        .with(Transform2D::<f32>::new())
        .with(Camera3D::<f32>::new())
        .build();

    dispatcher.dispatch(&mut world.res); // first frame init
    dispatcher.dispatch(&mut world.res);

    let globals = world.read_storage::<Camera3D<f32>>();

    for global in (&globals).join() {
        assert_eq!(
            global.view(),
            &[1.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, -1.0, -1.0, 0.0, 1.0]
        );
        assert_eq!(
            global.projection(),
            &[
                -0.16869165,
                0.0,
                0.0,
                0.0,
                0.0,
                -0.22492221,
                0.0,
                0.0,
                0.0,
                0.0,
                -1.0,
                -1.0,
                0.0,
                0.0,
                -<f32 as Float>::epsilon() * 2.0,
                0.0
            ]
        );
    }
}