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::Transform2DSystem;

use super::{Camera2D, Camera2DSystem, ScreenSize2D};

pub struct Camera2DBundle<T> {
    width: usize,
    height: usize,
    _marker: PhantomData<T>,
}

impl<T> Default for Camera2DBundle<T> {
    #[inline(always)]
    fn default() -> Self {
        Self::new(1024, 768)
    }
}

impl<T> Camera2DBundle<T> {
    #[inline(always)]
    pub fn new(width: usize, height: usize) -> Self {
        Camera2DBundle {
            width: width,
            height: height,
            _marker: PhantomData,
        }
    }
}

impl<'a, 'b, T> SpecsBundle<'a, 'b> for Camera2DBundle<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(ScreenSize2D::new(self.width, self.height));
        world.register::<Camera2D<T>>();

        Ok(dispatch_builder.with(
            Camera2DSystem::<T>::new(),
            &Camera2DSystem::<T>::name(),
            &[Transform2DSystem::<T>::name()],
        ))
    }
}