automatically zoom in on crops

Program.cs

@@ -185,6 +185,8 @@ public class CropTool : ITool {
 
     if (input.IsKeyPressed(Keys.Enter)) {
       game.Cursor = MouseCursor.Default;
+      photo.ViewOffset = new(photo.Size.X / 2 - Rectangle.Center(r).X,
+                             photo.Size.Y / 2 - Rectangle.Center(r).Y);
       return ToolStatus.Done;
     }
 
@@ -598,7 +600,14 @@ public class Game : GameWindow {
     }
 
     if (input.IsKeyPressed(Keys.Q)) {
-      photos[photoIndex].ViewOffset = Vector2i.Zero;
+      if (photos[photoIndex].CropRectangle != Rectangle.Empty) {
+        Photo photo = photos[photoIndex];
+        Rectangle r = photos[photoIndex].CropRectangle;
+        photo.ViewOffset = new(photo.Size.X / 2 - Rectangle.Center(r).X,
+                               photo.Size.Y / 2 - Rectangle.Center(r).Y);
+      } else {
+        photos[photoIndex].ViewOffset = Vector2i.Zero;
+      }
       zoomLevel = 0f;
     }
 
@@ -877,6 +886,7 @@ public class Game : GameWindow {
   void DrawPhotos() {
     Photo activePhoto = photos[photoIndex];
     Texture active = activePhoto.Texture();
+    bool cropActive = activeTool is CropTool;
 
     // FIXME: make a function for scaling & centering one box on another.
     // FIXME: cropping is fucky because activeScale is using the texture size, not the photo size.
@@ -885,6 +895,8 @@ public class Game : GameWindow {
     float scale = Math.Min(scaleX, scaleY);
     if (zoomLevel > 0f) {
       scale = zoomLevel;
+    } else if (!cropActive && activePhoto.CropRectangle != Rectangle.Empty) {
+      scale *= 0.95f * active.Size.X / activePhoto.CropRectangle.Width;
     }
     activeScale = scale;
 
@@ -902,7 +914,6 @@ public class Game : GameWindow {
       Texture star = (activePhoto.Rating > i) ? STAR_FILLED : STAR_EMPTY;
       DrawTexture(star, geometry.StarBoxes[i].Min.X, geometry.StarBoxes[i].Min.Y);
     }
-    bool cropActive = activeTool is CropTool;
     DrawCropRectangle(cropActive);
 
     // Draw thumbnail boxes.