From 548e603900252cd43ceba37ea352cb34f256a553 Mon Sep 17 00:00:00 2001
From: Ellpeck <megamaximal@gmail.com>
Date: Fri, 6 Dec 2019 20:54:30 +0100
Subject: [PATCH] made cameras snap right in small rooms and made panels not
 require a texture

---
 MLEM.Ui/Elements/Panel.cs |  3 ++-
 MLEM/Cameras/Camera.cs    | 24 ++++++++++++++++--------
 2 files changed, 18 insertions(+), 9 deletions(-)

diff --git a/MLEM.Ui/Elements/Panel.cs b/MLEM.Ui/Elements/Panel.cs
index eed7462..a9e12f5 100644
--- a/MLEM.Ui/Elements/Panel.cs
+++ b/MLEM.Ui/Elements/Panel.cs
@@ -130,7 +130,8 @@ namespace MLEM.Ui.Elements {
         }
 
         public override void Draw(GameTime time, SpriteBatch batch, float alpha, BlendState blendState, SamplerState samplerState, Matrix matrix) {
-            batch.Draw(this.Texture, this.DisplayArea, Color.White * alpha, this.Scale);
+            if (this.Texture.Value != null)
+                batch.Draw(this.Texture, this.DisplayArea, Color.White * alpha, this.Scale);
             // if we handle overflow, draw using the render target in DrawUnbound
             if (!this.scrollOverflow) {
                 base.Draw(time, batch, alpha, blendState, samplerState, matrix);
diff --git a/MLEM/Cameras/Camera.cs b/MLEM/Cameras/Camera.cs
index 227339e..b04baf8 100644
--- a/MLEM/Cameras/Camera.cs
+++ b/MLEM/Cameras/Camera.cs
@@ -71,15 +71,23 @@ namespace MLEM.Cameras {
         }
 
         public void ConstrainWorldBounds(Vector2 min, Vector2 max) {
-            if (this.Position.X < min.X)
-                this.Position.X = min.X;
-            if (this.Position.Y < min.Y)
-                this.Position.Y = min.Y;
+            if (this.Position.X < min.X && this.Max.X > max.X) {
+                this.LookingPosition = new Vector2((max.X - min.X) / 2, this.LookingPosition.Y);
+            } else {
+                if (this.Position.X < min.X)
+                    this.Position.X = min.X;
+                if (this.Max.X > max.X)
+                    this.Max = new Vector2(max.X, this.Max.Y);
+            }
 
-            if (this.Max.X > max.X)
-                this.Max = new Vector2(max.X, this.Max.Y);
-            if (this.Max.Y > max.Y)
-                this.Max = new Vector2(this.Max.X, max.Y);
+            if (this.Position.Y < min.Y && this.Max.Y > max.Y) {
+                this.LookingPosition = new Vector2(this.LookingPosition.X, (max.Y - min.Y) / 2);
+            } else {
+                if (this.Position.Y < min.Y)
+                    this.Position.Y = min.Y;
+                if (this.Max.Y > max.Y)
+                    this.Max = new Vector2(this.Max.X, max.Y);
+            }
         }
 
         public void Zoom(float delta, Vector2? zoomCenter = null) {