put stars at the center bottom and make f/ stringification simpler

Program.cs

@@ -292,17 +292,11 @@ public class Photo {
     IExifValue<Rational>? fNumber;
     if (exifs.TryGetValue(ExifTag.FNumber, out fNumber)) {
       Rational r = fNumber.Value;
-      if (r.Denominator == 1) {
-        FNumber = $"f/{r.Numerator}";
+      if (r.Numerator % r.Denominator == 0) {
+        FNumber = $"f/{r.Numerator / r.Denominator}";
       } else {
-        if (r.Denominator != 10) {
-          Console.WriteLine($"*** WARNING: unexpected FNumber denominator: {r.Denominator}");
-        }
-        if (r.Numerator % 10 == 0) {
-          FNumber = $"f/{r.Numerator / 10}";
-        } else {
-          FNumber= $"f/{r.Numerator / 10}.{r.Numerator % 10}";
-        }
+        int fTimesTen = (int) Math.Round(10f * r.Numerator / r.Denominator);
+        FNumber = $"f/{fTimesTen / 10}.{fTimesTen % 10}";
       }
     }
 
@@ -424,18 +418,19 @@ public class Texture : IDisposable {
 }
 
 public class UiGeometry {
-  public static Vector2i MIN_WINDOW_SIZE = new(640, 480);
+  public static Vector2i MIN_WINDOW_SIZE = new(1024, 768);
   private static CameraInfo activeCamera = CameraInfo.CANON_EOS_R6M2;
 
   public readonly Vector2i WindowSize;
   public readonly Box2i ThumbnailBox;
   public readonly List<Box2i> ThumbnailBoxes = new();
+  public readonly List<Box2i> StarBoxes = new();
   public readonly Box2i PhotoBox;
   public readonly Box2i StatusBox;
 
-  public UiGeometry() : this(MIN_WINDOW_SIZE) {}
+  public UiGeometry() : this(MIN_WINDOW_SIZE, 0) {}
 
-  public UiGeometry(Vector2i windowSize) {
+  public UiGeometry(Vector2i windowSize, int starSize) {
     WindowSize = windowSize;
 
     int numThumbnails = 15;
@@ -451,6 +446,13 @@ public class UiGeometry {
     PhotoBox = new Box2i(0, 0, WindowSize.X - thumbnailWidth, WindowSize.Y - statusBoxHeight - statusBoxPadding);
     StatusBox = new Box2i(0, WindowSize.Y - statusBoxHeight, WindowSize.X - thumbnailWidth, WindowSize.Y);
     ThumbnailBox = new Box2i(ThumbnailBoxes[0].Min.X, ThumbnailBoxes[0].Min.Y, WindowSize.X, WindowSize.Y);
+
+    int starSpacing = 10;
+    int starBoxLeft = (int) (PhotoBox.Center.X - 2.5 * starSize - starSpacing * 2);
+    for (int i = 0; i < 5; i++) {
+      Box2i box = Util.MakeBox(starBoxLeft + i * (starSize + starSpacing), PhotoBox.Max.Y - starSize - 10, starSize, starSize);
+      StarBoxes.Add(box);
+    }
   }
 }
 
@@ -518,17 +520,19 @@ public static class Util {
   }
 
   public static Texture RenderStar(float radius, bool filled) {
-    IPath path = new Star(x: radius, y: radius, prongs: 5, innerRadii: radius * 0.45f, outerRadii: radius, angle: Util.PI);
+    IPath path = new Star(x: radius, y: radius + 1, prongs: 5, innerRadii: radius * 0.4f, outerRadii: radius, angle: Util.PI);
     // We add a little bit to the width & height because the reported
     // path.Bounds are often a little tighter than they should be & a couple
     // pixels end up obviously missing...
     Image<Rgba32> image = MakeImage(path.Bounds.Width + 2, path.Bounds.Height + 2);
     IBrush brush = Brushes.Solid(Color.White);
-    IPen pen = Pens.Solid(Color.White, 1.5f);
+    IPen white = Pens.Solid(Color.White, 1.5f);
+    IPen black = Pens.Solid(Color.Black, 3f);
+    image.Mutate(x => x.Draw(black, path));
     if (filled) {
       image.Mutate(x => x.Fill(brush, path));
     }
-    image.Mutate(x => x.Draw(pen, path));
+    image.Mutate(x => x.Draw(white, path));
     Texture texture = new Texture(image);
     image.Dispose();
     return texture;
@@ -713,8 +717,8 @@ public class Game : GameWindow {
 
     // Load photos from a directory.
     // string[] files = Directory.GetFiles(@"c:\users\colin\desktop\photos-test\");
-    string[] files = Directory.GetFiles(@"c:\users\colin\pictures\photos\2023\07\14\");
-    // string[] files = Directory.GetFiles(@"G:\DCIM\100EOSR6\");
+    // string[] files = Directory.GetFiles(@"c:\users\colin\pictures\photos\2023\07\14\");
+    string[] files = Directory.GetFiles(@"G:\DCIM\100EOSR6\");
     // string[] files = Directory.GetFiles(@"C:\Users\colin\Pictures\photos\2018\06\23");
     // string[] files = Directory.GetFiles(@"C:\Users\colin\Desktop\Germany all\104D7000");
     // string[] files = Directory.GetFiles(@"C:\Users\colin\Desktop\many-birds\");
@@ -798,7 +802,7 @@ public class Game : GameWindow {
     DrawTexture(active, photoBox);
     for (int i = 0; i < 5; i++) {
       Texture star = (activePhoto.Rating > i) ? STAR_FILLED : STAR_EMPTY;
-      DrawTexture(star, (star.Size.X + 10) * i + 10, 10);
+      DrawTexture(star, geometry.StarBoxes[i].Min.X, geometry.StarBoxes[i].Min.Y);
     }
 
     // Draw thumbnail boxes.
@@ -870,7 +874,7 @@ public class Game : GameWindow {
     base.OnResize(e);
     Console.WriteLine($"OnResize: {e.Width}x{e.Height}");
 
-    geometry = new UiGeometry(e.Size);
+    geometry = new UiGeometry(e.Size, STAR_FILLED.Size.X);
 
     projection = Matrix4.CreateOrthographicOffCenter(0f, e.Width, e.Height, 0f, -1f, 1f);
     GL.UniformMatrix4(shader.GetUniformLocation("projection"), true, ref projection);