Add Text.DrawOutlined() function & other text helpers.

GitOrigin-RevId: 47f9115767c9acac31edaed13ba0ac62732a27f1

Shared/Camera.cs

@@ -11,6 +11,7 @@ namespace SemiColinGames {
     public int Height { get => bbox.Height; }
     public int Left { get => bbox.Left; }
     public int Top { get => bbox.Top; }
+    public Point HalfSize { get => new Point(Width / 2, Height / 2); }
 
     public Matrix Projection {
       get => Matrix.CreateOrthographicOffCenter(Left, Left + Width, Height, 0, -1, 1);

Shared/ExtensionMethods.cs

@@ -1,9 +1,21 @@
 using Microsoft.Xna.Framework;
+using Microsoft.Xna.Framework.Graphics;
 
 // All extension methods on built-in types (of C# or MonoGame) go in this file.
+// Methods are ordered alphabetically by type name.
 
 namespace SemiColinGames {
   static class ExtensionMethods {
+    // Point
+    public static void Deconstruct(this Point point, out int x, out int y) =>
+      (x, y) = (point.X, point.Y);
+
+    // SpriteFont
+    public static Vector2 CenteredOn(this SpriteFont font, string text, Point position) {
+      Vector2 size = font.MeasureString(text);
+      return new Vector2(position.X - (int) size.X / 2, position.Y - (int) size.Y / 2);
+    }
+
     // Vector2
     public static Vector2 Rotate(this Vector2 point, float angle) {
       float cos = FMath.Cos(angle);
@@ -12,9 +24,5 @@ namespace SemiColinGames {
         point.X * cos - point.Y * sin,
         point.Y * cos + point.X * sin);
     }
-
-    // Point
-    public static void Deconstruct(this Point point, out int x, out int y) =>
-      (x, y) = (point.X, point.Y);
   }
 }

Shared/Scene.cs

@@ -95,26 +95,13 @@ namespace SemiColinGames {
       Debug.Draw(graphics, basicEffect);
 
       // Draw in-world UI on top of everything.
-      // TODO: make a Text.cs file and move things like "black outlined text" there.
       if (paused) {
-        string text = "Paused";
-        Vector2 size = Textures.BannerFont.MeasureString(text);
-        Vector2 position = new Vector2((camera.Width - size.X) / 2, (camera.Height - size.Y) / 2);
-
         spriteBatch.Begin(
             SpriteSortMode.Deferred, null, SamplerState.PointClamp, null, null, null, null);
 
-        for (int i = -1; i <= 1; i++) {
+        string text = "Paused";
-          for (int j = -1; j <= 1; j++) {
+        Vector2 position = Textures.BannerFont.CenteredOn(text, camera.HalfSize);
-            if (i == 0 && j == 0) {
+        Text.DrawOutlined(spriteBatch, Textures.BannerFont, text, position, Color.White);
-              continue;
-            }
-            Vector2 stencilPos = new Vector2(position.X + i, position.Y + j);
-            spriteBatch.DrawString(Textures.BannerFont, text, stencilPos, Color.Black);
-          }
-        }
-
-        spriteBatch.DrawString(Textures.BannerFont, text, position, Color.White);
         spriteBatch.End();
       }
 

Shared/Shared.projitems

@@ -11,6 +11,7 @@
   <ItemGroup>
     <Compile Include="$(MSBuildThisFileDirectory)Camera.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)ExtensionMethods.cs" />
+    <Compile Include="$(MSBuildThisFileDirectory)Text.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Textures.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Clock.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Geometry.cs" />

Shared/Text.cs

@@ -0,0 +1,21 @@
+using Microsoft.Xna.Framework;
+using Microsoft.Xna.Framework.Graphics;
+
+namespace SemiColinGames {
+  static class Text {
+    // Outlined text in black.
+    public static void DrawOutlined(
+        SpriteBatch spriteBatch, SpriteFont font, string text, Vector2 position, Color color) {
+      for (int i = -1; i <= 1; i++) {
+        for (int j = -1; j <= 1; j++) {
+          if (i == 0 && j == 0) {
+            continue;
+          }
+          Vector2 stencilPos = new Vector2(position.X + i, position.Y + j);
+          spriteBatch.DrawString(font, text, stencilPos, Color.Black);
+        }
+      }
+      spriteBatch.DrawString(font, text, position, color);
+    }
+  }
+}

Shared/Textures.cs

@@ -28,7 +28,7 @@ namespace SemiColinGames {
     }
   }
 
-  class Textures {
+  static class Textures {
 
     public static SpriteFont DebugFont;
     public static SpriteFont BannerFont;