draw newly-refactored cropbox on screen etc

Program.cs

@@ -40,6 +40,7 @@ public class FpsCounter {
   }
 }
 
+
 public class CameraInfo {
   public readonly Vector2i Resolution;
 
@@ -52,12 +53,14 @@ public class CameraInfo {
   public static readonly CameraInfo IPHONE_12_MINI = new(new Vector2i(4032, 3024));
 }
 
+
 public enum ToolState {
   Active,
   Done,
   Canceled
 }
 
+
 public interface ITool {
   void SetActivePhoto(Photo photo);
   ToolState HandleInput(UiGeometry geometry, KeyboardState input, MouseState mouse, Game game);
@@ -65,6 +68,7 @@ public interface ITool {
   void Draw(UiGeometry geometry, Game game);
 }
 
+
 public class ViewTool : ITool {
   Photo? activePhoto;
 
@@ -77,7 +81,7 @@ public class ViewTool : ITool {
   }
 
   public string Status() {
-    return "view";
+    return "";
   }
 
   public void Draw(UiGeometry geometry, Game game) {
@@ -88,39 +92,51 @@ public class ViewTool : ITool {
 // FIXME: remove unneeded dependencies on "Game" or at least refactor them a bit.
 public class CropTool : ITool {
 
-  Photo? activePhoto;
+  Photo activePhoto;
   Vector2i mouseDragStart;
   Vector2i mouseDragEnd;
   string status = "";
 
+  public CropTool(Photo photo) {
+    activePhoto = photo;
+  }
+
   public void SetActivePhoto(Photo photo) {
+    if (photo != activePhoto) {
+      mouseDragStart = Vector2i.Zero;
+      mouseDragEnd = Vector2i.Zero;
+    }
     activePhoto = photo;
   }
 
   public ToolState HandleInput(UiGeometry geometry, KeyboardState input, MouseState mouse, Game game) {
     Vector2i mousePosition = (Vector2i) mouse.Position;
+    Vector2i imagePosition = game.ScreenToImage(mousePosition);
 
     if (mouse.IsButtonPressed(MouseButton.Button1)) {
       if (geometry.PhotoBox.ContainsInclusive(mousePosition)) {
-        mouseDragStart = mousePosition;
+        mouseDragStart = imagePosition;
       }
     }
 
     if (mouse.IsButtonDown(MouseButton.Button1)) {
       if (geometry.PhotoBox.ContainsInclusive(mousePosition)) {
-        // FIXME: really this should be clipped to the active photo's drawable area, not the whole photobox.
-        mouseDragEnd = mousePosition;
+        mouseDragEnd = imagePosition;
       }
     }
 
-    Vector2i start = game.ScreenToImage(mouseDragStart);
-    // FIXME: this needs to be the actual width of the computed box.
-    Vector2i size = game.ScreenToImage(mouseDragEnd) - start;
+    var (left, right, top, bottom) = GetCrop();
 
-    status = $"({start.X}, {start.Y}) {size.X}x{size.Y}";
+    Vector2i size = new(right - left, bottom - top);
+    status = $"({left}, {top}) {size.X}x{size.Y}";
+
+    Rectangle crop = Rectangle.Empty;
+    if (size.X > 0 && size.Y > 0) {
+      crop = Rectangle.FromLTRB(left, top, right, bottom);
+    }
+    activePhoto.CropRectangle = crop;
 
     if (input.IsKeyPressed(Keys.Enter)) {
-      ApplyCrop(game);
       return ToolState.Done;
     }
 
@@ -139,6 +155,8 @@ public class CropTool : ITool {
     // in other direction work well.
     Vector2i start = mouseDragStart;
     Vector2i end = mouseDragEnd;
+    // FIXME: choose the aspect ratio based on the original image aspect ratio.
+    // FIXME: allow for unconstrained crop, 1:1, etc.
     end.Y = Math.Min(end.Y, start.Y + (end.X - start.X) * 4 / 6);
     end.X = start.X + (end.Y - start.Y) * 6 / 4;
     int left = Math.Min(start.X, end.X);
@@ -148,31 +166,16 @@ public class CropTool : ITool {
     return (left, right, top, bottom);
   }
 
-  void ApplyCrop(Game game) {
-    var (left, right, top, bottom) = GetCrop();
-    int area = (right - left) * (bottom - top);
-    if (area == 0) {
-      return;
-    }
-
-    Vector2i leftTop = game.ScreenToImage(left, top);
-    Vector2i rightBottom = game.ScreenToImage(right, bottom);
-    Rectangle crop = Rectangle.FromLTRB(leftTop.X, leftTop.Y, rightBottom.X, rightBottom.Y);
-    // FIXME: make sure this doesn't exceed image.Bounds.
-    // FIXME: once set, display it properly in the PhotoBox.
-    if (activePhoto != null) {
-      activePhoto.CropRectangle = crop;
-    }
-    Console.WriteLine(crop);
-  }
-
   public void Draw(UiGeometry geometry, Game game) {
-    var (left, right, top, bottom) = GetCrop();
-    int area = (right - left) * (bottom - top);
-
-    if (area == 0) {
+    if (activePhoto.CropRectangle == Rectangle.Empty) {
       return;
     }
+
+    Vector2i leftTop = game.ImageToScreen(activePhoto.CropRectangle.Left, activePhoto.CropRectangle.Top);
+    Vector2i rightBottom = game.ImageToScreen(activePhoto.CropRectangle.Right, activePhoto.CropRectangle.Bottom);
+    var (left, top) = leftTop;
+    var (right, bottom) = rightBottom;
+
     Color4 shadeColor = new Color4(0, 0, 0, 0.75f);
     game.DrawFilledBox(new Box2i(0, 0, left, geometry.PhotoBox.Max.Y), shadeColor);
     game.DrawFilledBox(new Box2i(left, 0, geometry.PhotoBox.Max.X, top), shadeColor);
@@ -192,7 +195,7 @@ public class CropTool : ITool {
   }
 }
 
-// FIXME: this should probably be IDisposable?
+
 public class Photo {
   public string Filename;
   public bool Loaded = false;
@@ -474,6 +477,7 @@ public class Photo {
   }
 }
 
+
 public class Texture : IDisposable {
   public int Handle;
   public Vector2i Size;
@@ -524,6 +528,7 @@ public class Texture : IDisposable {
   }
 }
 
+
 public class UiGeometry {
   public static Vector2i MIN_WINDOW_SIZE = new(1024, 768);
   private static CameraInfo activeCamera = CameraInfo.CANON_EOS_R6M2;
@@ -565,6 +570,7 @@ public class UiGeometry {
   }
 }
 
+
 public static class Util {
   public const float PI = (float) Math.PI;
 
@@ -587,7 +593,7 @@ public static class Util {
     }
     // FIXME: I'm not convinced that all of these are correct, especially the
     // cases that involve flipping (because whether you're flipping before or
-    // after rotation matters.).
+    // after rotation matters.)
     var operations = new Dictionary<ushort, (RotateMode, FlipMode)> {
       { 2, (RotateMode.None, FlipMode.Horizontal) },
       { 3, (RotateMode.Rotate180, FlipMode.None) },
@@ -606,6 +612,11 @@ public static class Util {
   }
 
   public static Texture RenderText(string text, int size) {
+    // Make sure that 0-length text doesn't end up as a 0-size texture, which
+    // might cause problems.
+    if (text.Length == 0) {
+      text = " ";
+    }
     Font font = SystemFonts.CreateFont("Consolas", size, FontStyle.Bold);
     TextOptions options = new(font);
     FontRectangle rect = TextMeasurer.Measure(text, new TextOptions(font));
@@ -652,6 +663,7 @@ public static class Util {
   }
 }
 
+
 public class Game : GameWindow {
   public Game(GameWindowSettings gwSettings, NativeWindowSettings nwSettings) : base(gwSettings, nwSettings) {
     activeTool = viewTool;
@@ -713,8 +725,6 @@ public class Game : GameWindow {
       Close();
     }
 
-    int lastPhotoIndex = photoIndex;
-
     mousePosition = (Vector2i) MouseState.Position;
 
     // Look for mouse clicks on thumbnails or stars.
@@ -786,10 +796,6 @@ public class Game : GameWindow {
       photoIndex = Math.Clamp(photoIndex, 0, photos.Count - 1);
     }
 
-    if (photoIndex != lastPhotoIndex) {
-      // FIXME!!!: do something to reset tool state here
-    }
-
     // Handle presses of the "rating" keys -- 0-5 and `.
     // A normal press just sets the rating of the current photo.
     // If the user is holding "shift", we instead filter to only show photos of that rating or higher.
@@ -856,7 +862,7 @@ public class Game : GameWindow {
     // Handle tool switching.
     if (activeTool == viewTool) {
       if (input.IsKeyPressed(Keys.C)) {
-        activeTool = new CropTool();
+        activeTool = new CropTool(photos[photoIndex]);
       }
     }
 
@@ -930,9 +936,9 @@ 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");
@@ -1109,7 +1115,9 @@ public class Game : GameWindow {
 
   public Vector2i ScreenToImage(int x, int y) {
     int rx = (int) ((x - activeOffset.X) / activeScale);
+    rx = Math.Clamp(rx, 0, photos[photoIndex].Size.X);
     int ry = (int) ((y - activeOffset.Y) / activeScale);
+    ry = Math.Clamp(ry, 0, photos[photoIndex].Size.Y);
     return new(rx, ry);
   }
 
@@ -1117,6 +1125,16 @@ public class Game : GameWindow {
     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));
   }
@@ -1200,6 +1218,7 @@ public class Game : GameWindow {
   }
 }
 
+
 static class Program {
   static void Main(string[] args) {
     List<MonitorInfo> monitors = Monitors.GetMonitors();