specs_camera 0.3.6

camera 2d and 3d component for specs
Documentation 
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use std::marker::PhantomData;
use std::ops::{Add, Div, Mul, Neg, Sub};

use num_traits::{Float, FromPrimitive};
use specs::{DispatcherBuilder, World};
use specs_bundler::SpecsBundle;
use specs_transform::Transform3DSystem;

use super::{Camera3D, Camera3DSystem, ScreenSize3D};

pub struct Camera3DBundle<T> {
    width: usize,
    height: usize,
    _marker: PhantomData<T>,
}

impl<T> Default for Camera3DBundle<T> {
    #[inline(always)]
    fn default() -> Self {
        Self::new(1024, 768)
    }
}

impl<T> Camera3DBundle<T> {
    #[inline(always)]
    pub fn new(width: usize, height: usize) -> Self {
        Camera3DBundle {
            width: width,
            height: height,
            _marker: PhantomData,
        }
    }
}

impl<'a, 'b, T> SpecsBundle<'a, 'b> for Camera3DBundle<T>
where
    T: 'static + Send + Sync + Float + FromPrimitive,
    for<'c, 'd> &'c T: Sub<&'d T, Output = T>
        + Add<&'d T, Output = T>
        + Div<&'d T, Output = T>
        + Mul<&'d T, Output = T>
        + Neg<Output = T>,
{
    type Error = ();

    #[inline]
    fn build(
        self,
        world: &mut World,
        dispatch_builder: DispatcherBuilder<'a, 'b>,
    ) -> Result<DispatcherBuilder<'a, 'b>, Self::Error> {
        world.add_resource(ScreenSize3D::new(self.width, self.height));
        world.register::<Camera3D<T>>();

        Ok(dispatch_builder.with(
            Camera3DSystem::<T>::new(),
            &Camera3DSystem::<T>::name(),
            &[Transform3DSystem::<T>::name()],
        ))
    }
}