sailor 0.1.0

A sailing navigation application.
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use ncollide2d::math::Point;
use nalgebra::base::Vector4;

use crate::*;

pub struct Collider {
}

impl Collider {
    pub fn get_hovered_objects<'a>(cache: &'a TileCache, screen: &Screen, zoom: f32, point: (f32, f32)) -> Vec<Object> {
        let mut return_objects = vec![];
        let tile_field = screen.get_tile_boundaries_for_zoom_level(zoom, 1);

        for tile_id in tile_field.iter() {
            if let Some(tile) = cache.try_get_tile(&tile_id) {
                let read_tile = tile.read().unwrap();
                let matrix = screen.tile_to_global_space(
                    zoom,
                    &tile_id
                );
                let matrix = nalgebra_glm::inverse(&matrix);
                let screen_point = Point::new(
                    point.0 / (screen.width / 2) as f32 - 1.0,
                    point.1 / (screen.height / 2) as f32 - 1.0
                );
                let global_point = matrix * Vector4::new(screen_point.x, screen_point.y, 0.0, 1.0);
                let tile_point = Point::new(global_point.x, global_point.y) * read_tile.extent() as f32;

                if tile_point.x >= 0.0 && tile_point.x <= read_tile.extent() as f32
                && tile_point.y >= 0.0 && tile_point.y <= read_tile.extent() as f32 {
                    if let Ok(collider) = read_tile.collider().try_read() {
                        if let Ok(objects) = read_tile.objects().try_read() {
                            let object_ids = collider.get_hovered_objects(&tile_point);
                            for object_id in object_ids {
                                return_objects.push(objects[object_id].clone())
                            }
                        }
                    }
                    return return_objects
                }
            } else {
                log::trace!("[Intersection pass] Could not read tile {} from cache.", tile_id);
            }
        }

        return_objects
    }
}