From c24bf56c3d69b826078307ddebb129a7be99ad97 Mon Sep 17 00:00:00 2001
From: Tom Barrett <tom@tombarrett.xyz>
Date: Sat, 20 Mar 2021 17:22:49 +0100
Subject: explosion animation system

---
 src/main.rs | 39 +++++++++++++++++++++++++++++++++++----
 1 file changed, 35 insertions(+), 4 deletions(-)

diff --git a/src/main.rs b/src/main.rs
index c81203f..4df4fa7 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -73,6 +73,36 @@ fn cell_insert_system(mut cell_query: Query<(&mut Cell, &mut TextureAtlasSprite)
     }
 }
 
+fn explosion_animation_system(
+    time: Res<Time>,
+    commands: &mut Commands,
+    mut cell_query: Query<(
+        Entity,
+        &mut Cell,
+        &mut TextureAtlasSprite,
+        Option<&mut Timer>,
+    )>,
+) {
+    for (entity, mut cell, mut sprite, timer) in cell_query.iter_mut() {
+        if cell.occupant == Occupant::Explosion {
+            if let Some(mut timer) = timer {
+                timer.tick(time.delta_seconds());
+                if timer.finished() {
+                    if sprite.index < 7 && sprite.index >= 4 {
+                        sprite.index += 1;
+                    } else {
+                        cell.occupant = Occupant::None;
+                        sprite.index = cell.occupant.to_index();
+                        commands.remove_one::<Timer>(entity);
+                    }
+                }
+            } else {
+                commands.insert(entity, (Timer::from_seconds(0.1, true),));
+            }
+        }
+    }
+}
+
 fn cell_check_system(mut cell_query: Query<(&mut Cell, &mut TextureAtlasSprite)>) {
     let mut cells = [[Cell::default(); constants::COLUMNS]; constants::ROWS];
     for (cell, _) in cell_query.iter_mut() {
@@ -99,10 +129,10 @@ fn cell_check_system(mut cell_query: Query<(&mut Cell, &mut TextureAtlasSprite)>
     }
 
     for c in connected.iter() {
-        if c.len() > 3 {
+        if c.len() > 4 {
             for (i, j) in c.iter() {
                 for (mut cell, mut sprite) in cell_query.iter_mut() {
-                    if &cell.x == i && &cell.y == j {
+                    if &cell.x == i && &cell.y == j && cell.occupant != Occupant::Explosion {
                         cell.occupant = Occupant::Explosion;
                         sprite.index = cell.occupant.to_index();
                     }
@@ -130,10 +160,10 @@ fn cell_check_system(mut cell_query: Query<(&mut Cell, &mut TextureAtlasSprite)>
     }
 
     for c in connected.iter() {
-        if c.len() > 3 {
+        if c.len() > 4 {
             for (i, j) in c.iter() {
                 for (mut cell, mut sprite) in cell_query.iter_mut() {
-                    if &cell.x == i && &cell.y == j {
+                    if &cell.x == i && &cell.y == j && cell.occupant != Occupant::Explosion {
                         cell.occupant = Occupant::Explosion;
                         sprite.index = cell.occupant.to_index();
                     }
@@ -258,6 +288,7 @@ impl Plugin for GemsPlugin {
         app.add_system(cell_insert_system.system());
         app.add_system(cell_falling_system.system());
         app.add_system(cell_check_system.system());
+        app.add_system(explosion_animation_system.system());
     }
 }
 
-- 
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