Add missing system for completing chapter 2
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src/systems/gameplay_state_sytem.rs
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44
src/systems/gameplay_state_sytem.rs
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use specs::{Join, ReadStorage, System, Write};
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use std::collections::HashMap;
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use crate::{
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components::{Box, BoxSpot, Position},
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resources::{Gameplay, GameplayState},
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};
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pub struct GameplayStateSystem {}
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impl<'a> System<'a> for GameplayStateSystem {
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// Data
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type SystemData = (
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Write<'a, Gameplay>,
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ReadStorage<'a, Position>,
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ReadStorage<'a, Box>,
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ReadStorage<'a, BoxSpot>,
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);
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fn run(&mut self, data: Self::SystemData) {
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let (mut gameplay_state, positions, boxes, box_spots) = data;
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// get all boxes indexed by position
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let boxes_by_position: HashMap<(u8, u8), &Box> = (&positions, &boxes)
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.join()
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.map(|t| ((t.0.x, t.0.y), t.1))
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.collect();
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// loop through all box spots and check if there is a corresponding
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// box at that position
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for (_box_spot, position) in (&box_spots, &positions).join() {
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if boxes_by_position.contains_key(&(position.x, position.y)) {
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// continue
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} else {
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gameplay_state.state = GameplayState::Playing;
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return;
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}
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}
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// If we made it this far, then all box spots have boxes on them, and the
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// game has been won
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gameplay_state.state = GameplayState::Won;
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}
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}
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