three-d 0.19.0

2D/3D renderer - makes it simple to draw stuff across platforms (including web)
Documentation 
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use super::*;

///
/// A control that makes the camera fly through the 3D scene.
///
#[derive(Clone, Copy, Debug)]
pub struct FlyControl {
    /// The speed of movements.
    pub speed: f32,
}

impl FlyControl {
    /// Creates a new fly control with the given speed of movements.
    pub fn new(speed: f32) -> Self {
        Self { speed }
    }

    /// Handles the events. Must be called each frame.
    pub fn handle_events(
        &mut self,
        camera: &mut three_d_asset::Camera,
        events: &mut [Event],
    ) -> bool {
        let mut change = false;
        for event in events.iter_mut() {
            match event {
                Event::MouseMotion {
                    delta,
                    button,
                    handled,
                    ..
                } if !*handled => {
                    if Some(MouseButton::Left) == *button {
                        camera.yaw(radians(delta.0 * std::f32::consts::PI / 1800.0));
                        camera.pitch(radians(delta.1 * std::f32::consts::PI / 1800.0));
                        *handled = true;
                        change = true;
                    }
                    if Some(MouseButton::Right) == *button {
                        let right = camera.right_direction();
                        let up = right.cross(camera.view_direction());
                        camera.translate(-right * delta.0 * self.speed + up * delta.1 * self.speed);
                        *handled = true;
                        change = true;
                    }
                }
                Event::MouseWheel { delta, handled, .. } if !*handled => {
                    let v = camera.view_direction() * self.speed * delta.1;
                    camera.translate(v);
                    *handled = true;
                    change = true;
                }
                _ => {}
            }
        }
        change
    }
}