Adds adjustable top margin to world grid

src/main.rs

@@ -59,7 +59,8 @@ fn main()
             
             WorldPlugin {
                 grid_width: 100.,
-                grid_height: 100.
+                grid_height: 100.,
+                top_margin: 0.0
             },
             ShapePlugin
         ))

src/world.rs

@@ -12,6 +12,7 @@ struct WorldPluginState
     window_height: f32,
     grid_width: f32,
     grid_height: f32,
+    top_margin: f32,
 
 }
 
@@ -19,6 +20,7 @@ pub struct WorldPlugin
 {
     pub grid_width: f32,
     pub grid_height: f32,
+    pub top_margin: f32,
 }
 
 impl Plugin for WorldPlugin
@@ -36,7 +38,8 @@ impl Plugin for WorldPlugin
                     window_width: window.resolution.width(), 
                     window_height: window.resolution.height(),
                     grid_width: self.grid_width,
-                    grid_height: self.grid_height
+                    grid_height: self.grid_height,
+                    top_margin: self.top_margin,
                 })
                 .add_systems(Startup, setup);
         }
@@ -47,22 +50,22 @@ fn setup(mut commands: Commands, settings: Res<WorldPluginState>)
 {
 
     // Add Grid
-    let cell_width = settings.window_width / settings.grid_width;
+    let cell_width = settings.window_width / (settings.grid_width - 1.0);
-    let cell_height = settings.window_height / settings.grid_height;
+    let cell_height = (settings.window_height -  settings.top_margin) / (settings.grid_height - 1.0);
     let line_size = 2.0;
     let half_screen_width = settings.window_width / 2.0;
-    let half_screen_height = settings.window_height / 2.0;
+    let half_screen_height = (settings.window_height - settings.top_margin) / 2.0;
     for i in 0..settings.grid_width as i32
     {
-        let point_a = Vec2::new(i as f32 * cell_width - half_screen_width, -half_screen_height);
+        let point_a = Vec2::new(i as f32 * cell_width - half_screen_width, -half_screen_height - settings.top_margin);
-        let point_b = Vec2::new(i as f32 * cell_width - half_screen_width, half_screen_height);
+        let point_b = Vec2::new(i as f32 * cell_width - half_screen_width, half_screen_height - settings.top_margin);
         add_line(&mut commands, point_a, point_b, line_size);        
     }
 
     for i in 0..settings.grid_height as i32
     {
-        let point_a = Vec2::new(-half_screen_width, i as f32 * cell_height - half_screen_height);
+        let point_a = Vec2::new(-half_screen_width, i as f32 * cell_height - half_screen_height - settings.top_margin);
-        let point_b = Vec2::new(half_screen_width, i as f32 * cell_height - half_screen_height);
+        let point_b = Vec2::new(half_screen_width, i as f32 * cell_height - half_screen_height - settings.top_margin);
         add_line(&mut commands, point_a, point_b, line_size);      
     }
 }