pull out a separate Transform class

Program.cs

@@ -57,15 +57,54 @@ public enum ToolStatus {
 }
 
 
+public class Transform {
+  // FIXME: move scale and offset into Photo itself?
+  float activeScale;
+  Vector2i activeOffset;
+  Photo photo;
+
+  public Transform(float scale, Vector2i offset, Photo photo) {
+    activeScale = scale;
+    activeOffset = offset;
+    this.photo = photo;
+  }
+
+  public Vector2i ScreenToImageDelta(int x, int y) {
+    return new((int) (x / activeScale), (int) (y / activeScale));
+  }
+
+  public Vector2i ScreenToImage(int x, int y) {
+    int rx = (int) ((x - activeOffset.X) / activeScale);
+    int ry = (int) ((y - activeOffset.Y) / activeScale);
+    rx = Math.Clamp(rx, 0, photo.Size.X);
+    ry = Math.Clamp(ry, 0, photo.Size.Y);
+    return new(rx, ry);
+  }
+
+  public Vector2i ScreenToImage(Vector2i position) {
+    return ScreenToImage(position.X, position.Y);
+  }
+
+  public Vector2i ImageToScreen(int x, int y) {
+    int rx = (int) ((x * activeScale) + activeOffset.X);
+    int ry = (int) ((y * activeScale) + activeOffset.Y);
+    return new(rx, ry);
+  }
+
+  public Vector2i ImageToScreen(Vector2i position) {
+    return ImageToScreen(position.X, position.Y);
+  }
+}
+
 public interface ITool {
-  ToolStatus HandleInput(KeyboardState input, MouseState mouse, Game game);
+  ToolStatus HandleInput(KeyboardState input, MouseState mouse, Transform transform);
   string Status();
   void Draw(UiGeometry geometry, Game game);
 }
 
 
 public class ViewTool : ITool {
-  public ToolStatus HandleInput(KeyboardState input, MouseState mouse, Game game) {
+  public ToolStatus HandleInput(KeyboardState input, MouseState mouse, Transform transform) {
     return ToolStatus.Active;
   }
 
@@ -78,7 +117,6 @@ public class ViewTool : ITool {
 }
 
 
-// FIXME: remove unneeded dependencies on "Game" or at least refactor them a bit.
 public class CropTool : ITool {
 
   Photo photo;
@@ -93,9 +131,9 @@ public class CropTool : ITool {
     mouseDragEnd = new(photo.CropRectangle.Right, photo.CropRectangle.Bottom);
   }
 
-  public ToolStatus HandleInput(KeyboardState input, MouseState mouse, Game game) {
+  public ToolStatus HandleInput(KeyboardState input, MouseState mouse, Transform transform) {
     Vector2i mousePosition = (Vector2i) mouse.Position;
-    Vector2i imagePosition = game.ScreenToImage(mousePosition);
+    Vector2i imagePosition = transform.ScreenToImage(mousePosition);
 
     if (mouse.IsButtonPressed(MouseButton.Button1)) {
       dragging = photo.CropRectangle.Contains(imagePosition.X, imagePosition.Y);
@@ -118,7 +156,7 @@ public class CropTool : ITool {
     } else {
       if (mouse.IsButtonDown(MouseButton.Button1)) {
         Vector2 delta = mouse.Delta;
-        Vector2i imageDelta = game.ScreenToImageDelta((int) delta.X, (int) delta.Y);
+        Vector2i imageDelta = transform.ScreenToImageDelta((int) delta.X, (int) delta.Y);
         photo.CropRectangle.Offset(imageDelta.X, imageDelta.Y);
         if (photo.CropRectangle.Left < 0) {
           photo.CropRectangle.Offset(-photo.CropRectangle.Left, 0);
@@ -406,6 +444,7 @@ public class Game : GameWindow {
   Vector2i mousePosition;
   float activeScale = 1f;
   Vector2i activeOffset;
+  Transform transform = new(1f, Vector2i.Zero, null);
   Shader shader = new();
   Matrix4 projection;
   float zoomLevel = 0f;
@@ -574,7 +613,7 @@ public class Game : GameWindow {
     }
 
     // Delegate input to the active tool.
-    ToolStatus status = activeTool.HandleInput(KeyboardState, MouseState, this);
+    ToolStatus status = activeTool.HandleInput(KeyboardState, MouseState, transform);
 
     // Change back to the default tool if the active tool is done.
     if (status != ToolStatus.Active) {
@@ -642,9 +681,9 @@ public class Game : GameWindow {
     GL.VertexAttribPointer(texCoordLocation, 2, VertexAttribPointerType.Float, false, 5 * sizeof(float), 3 * sizeof(float));
 
     // Load photos from a directory.
-    // string[] files = Directory.GetFiles(@"c:\users\colin\desktop\photos-test\");
+    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\pictures\photos\2023\07\23\");
+    // string[] files = Directory.GetFiles(@"c:\users\colin\pictures\photos\2023\07\23\");
     // string[] files = Directory.GetFiles(@"G:\DCIM\100EOSR6\");
     // string[] files = Directory.GetFiles(@"c:\users\colin\desktop\totte-output\2023\07\31");
     // string[] files = Directory.GetFiles(@"C:\Users\colin\Pictures\photos\2018\06\23");
@@ -777,6 +816,7 @@ public class Game : GameWindow {
     Vector2i center = (Vector2i) geometry.PhotoBox.Center;
     Box2i photoBox = Util.MakeBox(center.X - renderSize.X / 2, center.Y - renderSize.Y / 2, renderSize.X, renderSize.Y);
     activeOffset = new(photoBox.Min.X, photoBox.Min.Y);
+    transform = new Transform(activeScale, activeOffset, activePhoto);
     DrawTexture(active, photoBox);
     for (int i = 0; i < 5; i++) {
       Texture star = (activePhoto.Rating > i) ? STAR_FILLED : STAR_EMPTY;
@@ -827,8 +867,8 @@ public class Game : GameWindow {
       return;
     }
 
-    Vector2i leftTop = ImageToScreen(activePhoto.CropRectangle.Left, activePhoto.CropRectangle.Top);
-    Vector2i rightBottom = ImageToScreen(activePhoto.CropRectangle.Right, activePhoto.CropRectangle.Bottom);
+    Vector2i leftTop = transform.ImageToScreen(activePhoto.CropRectangle.Left, activePhoto.CropRectangle.Top);
+    Vector2i rightBottom = transform.ImageToScreen(activePhoto.CropRectangle.Right, activePhoto.CropRectangle.Bottom);
     var (left, top) = leftTop;
     var (right, bottom) = rightBottom;
 
@@ -846,32 +886,6 @@ public class Game : GameWindow {
     }
   }
 
-  public Vector2i ScreenToImageDelta(int x, int y) {
-    return new((int) (x / activeScale), (int) (y / activeScale));
-  }
-
-  public Vector2i ScreenToImage(int x, int y) {
-    int rx = (int) ((x - activeOffset.X) / activeScale);
-    int ry = (int) ((y - activeOffset.Y) / activeScale);
-    rx = Math.Clamp(rx, 0, photos[photoIndex].Size.X);
-    ry = Math.Clamp(ry, 0, photos[photoIndex].Size.Y);
-    return new(rx, ry);
-  }
-
-  public Vector2i ScreenToImage(Vector2i position) {
-    return ScreenToImage(position.X, position.Y);
-  }
-
-  public Vector2i ImageToScreen(int x, int y) {
-    int rx = (int) ((x * activeScale) + activeOffset.X);
-    int ry = (int) ((y * activeScale) + activeOffset.Y);
-    return new(rx, ry);
-  }
-
-  public Vector2i ImageToScreen(Vector2i position) {
-    return ImageToScreen(position.X, position.Y);
-  }
-
   public void DrawTexture(Texture texture, int x, int y) {
     DrawTexture(texture, Util.MakeBox(x, y, texture.Size.X, texture.Size.Y));
   }