add focal length to EXIF display & tweak other EXIF display

Program.cs

@@ -146,6 +146,7 @@ public class Photo {
   public bool Loaded = false;
   public string? CameraModel;
   public string? LensModel;
+  public string FocalLength = "<unk>";
   public string FNumber = "<unk>";
   public string ExposureTime = "<unk>";
   public string IsoSpeed = "<unk>";
@@ -164,7 +165,6 @@ public class Photo {
     image = await Image.LoadAsync<Rgba32>(File);
     ExifProfile? exifs = image.Metadata.ExifProfile;
     if (exifs != null) {
-      Console.WriteLine("--------------------------------------");
       // FIXME: handle Orientation
       IExifValue<string>? model;
       if (exifs.TryGetValue(ExifTag.Model, out model)) {
@@ -175,6 +175,12 @@ public class Photo {
         LensModel = lensModel.Value;
       }
 
+      IExifValue<Rational>? focalLength;
+      if (exifs.TryGetValue(ExifTag.FocalLength, out focalLength)) {
+        Rational r = focalLength.Value;
+        FocalLength = $"{r.Numerator / r.Denominator}mm";
+      }
+
       IExifValue<Rational>? fNumber;
       if (exifs.TryGetValue(ExifTag.FNumber, out fNumber)) {
         Rational r = fNumber.Value;
@@ -205,12 +211,14 @@ public class Photo {
 
       IExifValue<ushort[]>? isoSpeed;
       if (exifs.TryGetValue(ExifTag.ISOSpeedRatings, out isoSpeed)) {
-        ushort[] iso = isoSpeed.Value;
-        IsoSpeed = $"ISO {iso[0]}";
-      }
-      foreach (IExifValue exif in exifs.Values) {
-        Console.WriteLine(exif.Tag.ToString() + " " + exif.GetValue().ToString());
+        ushort[]? iso = isoSpeed.Value;
+        if (iso != null && iso.Length >= 1) {
+          IsoSpeed = $"ISO {iso[0]}";
+        }
       }
+      // foreach (IExifValue exif in exifs.Values) {
+      //   Console.WriteLine(exif.Tag.ToString() + " " + exif.GetValue().ToString());
+      // }
     }
   }
 
@@ -226,10 +234,10 @@ public class Photo {
 
   public string Description() {
     if (Loaded) {
-      string shootingInfo = $"{FNumber} at {ExposureTime}, {IsoSpeed}";
-      return String.Format("{0,-30} {1,-50} {2}", shootingInfo, $"{CameraModel} {LensModel}", File);
+      string shootingInfo = $"{FocalLength}, {FNumber} at {ExposureTime}, {IsoSpeed}";
+      return String.Format("{0,-40} {1,-50} {2}", shootingInfo, $"{CameraModel} {LensModel}", File);
     } else {
-      return String.Format("{0,-81} {1}", "", File);
+      return String.Format("{0,-90}  {1}", "", File);
     }
   }
 }
@@ -489,10 +497,12 @@ public class Game : GameWindow {
     GL.VertexAttribPointer(texCoordLocation, 2, VertexAttribPointerType.Float, false, 5 * sizeof(float), 3 * sizeof(float));
 
     // Load textures from JPEGs.
-    // 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(@"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\2018\06\23");
     // string[] files = Directory.GetFiles(@"C:\Users\colin\Desktop\Germany all\104D7000");
+    // string[] files = Directory.GetFiles(@"C:\Users\colin\Desktop\many-birds\");
 
     for (int i = 0; i < files.Count(); i++) {
       string file = files[i];
@@ -500,7 +510,9 @@ public class Game : GameWindow {
         Photo photo = new Photo(file, TEXTURE_WHITE);
         photos.Add(photo);
         await Task.Run( () => { photo.Load(); });
-        Console.WriteLine("file " + i);
+        if (photos.Count == 100) {
+          break;
+        }
       }
     }
   }