From 3449202489951dc0ca43428062439d34f5fc2e8a Mon Sep 17 00:00:00 2001
From: Tom Barrett <tom@tombarrett.xyz>
Date: Sun, 21 Mar 2021 14:16:03 +0100
Subject: mouse hover over gems

---
 src/main.rs | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/src/main.rs b/src/main.rs
index 4df4fa7..bb65f81 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -281,6 +281,33 @@ pub fn setup(
     }
 }
 
+fn mouse_system(
+    windows: Res<Windows>,
+    mut cell_query: Query<(&Cell, &mut Transform, &mut TextureAtlasSprite)>,
+) {
+    if let Some(mut cursor_position) = windows
+        .get_primary()
+        .and_then(|window| window.cursor_position())
+    {
+        cursor_position.x -= 400.0 - 16.0 * 3.5 * 0.5;
+        cursor_position.y -= 300.0 - 16.0 * 3.5 * 0.5;
+
+        for (_, _, mut sprite) in cell_query.iter_mut() {
+            sprite.color.set_a(1.0);
+        }
+
+        for (_, transform, mut sprite) in cell_query.iter_mut() {
+            if transform.translation.x < cursor_position.x
+                && transform.translation.x + 16.0 * 3.5 > cursor_position.x
+                && transform.translation.y < cursor_position.y
+                && transform.translation.y + 16.0 * 3.5 > cursor_position.y
+            {
+                sprite.color.set_a(0.5);
+            }
+        }
+    }
+}
+
 pub struct GemsPlugin;
 impl Plugin for GemsPlugin {
     fn build(&self, app: &mut AppBuilder) {
@@ -289,6 +316,7 @@ impl Plugin for GemsPlugin {
         app.add_system(cell_falling_system.system());
         app.add_system(cell_check_system.system());
         app.add_system(explosion_animation_system.system());
+        app.add_system(mouse_system.system());
     }
 }
 
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