Optimise AssistRectangle and implement camera culling.

Code/Entities/AssistRectangle.cs

@@ -1,4 +1,5 @@
 using Celeste.Mod.Entities;
+using Celeste.Mod.Helpers;
 using Microsoft.Xna.Framework;
 using Monocle;
 
@@ -16,32 +17,43 @@ public AssistRectangle(Vector2 position, int width, int height, Color color)
             Position = position;
             Collider = new Hitbox(width, height);
             this.color = color;
+            Active = false;
         }
         public AssistRectangle(EntityData data, Vector2 offset) : this(data.Position + offset, data.Width, data.Height, Calc.HexToColor(data.Attr("color")))
         {
 
         }
         public override void Render()
         {
-            int num = (int)Left;
-            int num2 = (int)Right;
-            int num3 = (int)Top;
-            int num4 = (int)Bottom;
-            Draw.Rect(num + 4, num3 + 4, Width - 8f, Height - 8f, color * secretAlpha);
-            for (float num5 = num; num5 < (float)(num2 - 3); num5 += 3f)
+            int left = (int)Left;
+            int top = (int)Top;
+            float width = Width;
+            float height = Height;
+
+            if (!CullHelper.IsRectangleVisible(left, top, width, height))
             {
-                Draw.Line(num5, num3, num5 + 2f, num3, color);
-                Draw.Line(num5, num4 - 1, num5 + 2f, num4 - 1, color);
+                return;
             }
-            for (float num6 = num3; num6 < (float)(num4 - 3); num6 += 3f)
+
+            int right = (int)Right;
+            int bottom = (int)Bottom;
+
+            Draw.Rect(left + 4, top + 4, width - 8f, height - 8f, color * secretAlpha);
+            for (float x = left; x < right - 3; x += 3f)
+            {
+                Draw.Rect(x, top, 2, 1, color);
+                Draw.Rect(x, bottom - 1, 2, 1, color);
+            }
+            for (float y = top; y < bottom - 3; y += 3f)
             {
-                Draw.Line(num + 1, num6, num + 1, num6 + 2f, color);
-                Draw.Line(num2, num6, num2, num6 + 2f, color);
+                Draw.Rect(left, y, 1, 2, color);
+                Draw.Rect(right - 1, y, 1, 2, color);
             }
-            Draw.Rect(num + 1, num3, 1f, 2f, color);
-            Draw.Rect(num2 - 2, num3, 2f, 2f, color);
-            Draw.Rect(num, num4 - 2, 2f, 2f, color);
-            Draw.Rect(num2 - 2, num4 - 2, 2f, 2f, color);
+            Draw.Rect(left + 1, top, 1f, 2f, color);
+            Draw.Rect(right - 2, top, 2f, 2f, color);
+            Draw.Rect(left, bottom - 2, 2f, 2f, color);
+            Draw.Rect(right - 2, bottom - 2, 2f, 2f, color);
+
             base.Render();
         }
     }