maplibre 0.0.3

Maps for Desktop, Mobile and Web
Documentation 
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//! Extracts data from the current state.

use crate::{
    context::MapContext,
    render::{
        eventually::{Eventually, Eventually::Initialized},
        tile_view_pattern::{ViewTileSources, WgpuTileViewPattern},
    },
};

pub fn tile_view_pattern_system(
    MapContext {
        view_state, world, ..
    }: &mut MapContext,
) {
    let Some((
        Initialized(tile_view_pattern),
        view_tile_sources,
    )) = world.resources.query::<(
        &Eventually<WgpuTileViewPattern>,
        &ViewTileSources
    )>() else { return; };
    let view_region = view_state.create_view_region();

    if let Some(view_region) = &view_region {
        let zoom = view_state.zoom();

        let view_tiles =
            tile_view_pattern.generate_pattern(view_region, view_tile_sources, zoom, world);

        // TODO: Can we &mut borrow initially somehow instead of here?
        let Some(Initialized(tile_view_pattern)) = world
            .resources
            .query_mut::<&mut Eventually<WgpuTileViewPattern>>() else { return; };

        tile_view_pattern.update_pattern(view_tiles);
    }
}