From 9d5cb8d2432865e23921df61557adcbb1e05e7c2 Mon Sep 17 00:00:00 2001
From: Joey Pollack <jrpollack107@gmail.com>
Date: Wed, 2 Aug 2023 19:04:13 -0400
Subject: [PATCH] Adds grid auto resizing when window is resized

---
 src/main.rs  |  2 +-
 src/world.rs | 25 ++++++++++++++++++++++---
 2 files changed, 23 insertions(+), 4 deletions(-)

diff --git a/src/main.rs b/src/main.rs
index 5df37b1..914e9af 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -60,7 +60,7 @@ fn main()
             WorldPlugin {
                 grid_width: 100.,
                 grid_height: 100.,
-                top_margin: 0.0
+                top_margin: 50.0
             },
             ShapePlugin
         ))
diff --git a/src/world.rs b/src/world.rs
index ae51901..33b8e38 100644
--- a/src/world.rs
+++ b/src/world.rs
@@ -1,9 +1,9 @@
 
-use bevy::prelude::*;
+use bevy::{prelude::*, window::WindowResized};
 use bevy_prototype_lyon::prelude::*;
 
 #[derive(Component)]
-struct IsLine;
+struct GridLine;
 
 #[derive(Resource)]
 struct WorldPluginState
@@ -41,6 +41,7 @@ impl Plugin for WorldPlugin
                     grid_height: self.grid_height,
                     top_margin: self.top_margin,
                 })
+                .add_systems(Update, on_resize)
                 .add_systems(Startup, setup);
         }
     }
@@ -80,6 +81,24 @@ fn add_line(commands: &mut Commands, point_a: Vec2, point_b: Vec2, line_size: f3
             ..default()
         },
         Stroke::new(Color::BLACK, line_size),
-        IsLine,
+        GridLine,
     ));
+}
+
+fn on_resize(mut commands: Commands, mut settings: ResMut<WorldPluginState>, mut resize_reader: EventReader<WindowResized>, mut grid: Query<(Entity, &GridLine)> )
+{
+    for e in resize_reader.iter() 
+    {
+        // When resolution is being changed
+        // info!("new window size: {:.1} x {:.1}", e.width, e.height);
+        settings.window_width = e.width;
+        settings.window_height = e.height;
+    }
+
+    for (entity, line) in &grid
+    {
+        commands.entity(entity).despawn();
+    }
+
+    setup(commands, settings.into());
 }
\ No newline at end of file