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;
 
@@ -99,35 +103,40 @@ public class CropTool : ITool {
 
   public void SetActivePhoto(Photo photo) {
     if (photo != activePhoto) {
-      // FIXME: handle this sensibly.
+      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();
+
+    Vector2i size = new(right - left, bottom - top);
+    status = $"({left}, {top}) {size.X}x{size.Y}";
 
-    status = $"({start.X}, {start.Y}) {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;
     }
 
@@ -157,29 +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) {
+  public void Draw(UiGeometry geometry, Game game) {
+    if (activePhoto.CropRectangle == Rectangle.Empty) {
       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.
-    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);
+    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;
 
-    if (area == 0) {
-      return;
-    }
     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);
@@ -199,7 +195,7 @@ public class CropTool : ITool {
   }
 }
 
-// FIXME: this should probably be IDisposable?
+
 public class Photo {
   public string Filename;
   public bool Loaded = false;
@@ -481,6 +477,7 @@ public class Photo {
   }
 }
 
+
 public class Texture : IDisposable {
   public int Handle;
   public Vector2i Size;
@@ -531,6 +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;
@@ -572,6 +570,7 @@ public class UiGeometry {
   }
 }
 
+
 public static class Util {
   public const float PI = (float) Math.PI;
 
@@ -664,6 +663,7 @@ public static class Util {
   }
 }
 
+
 public class Game : GameWindow {
   public Game(GameWindowSettings gwSettings, NativeWindowSettings nwSettings) : base(gwSettings, nwSettings) {
     activeTool = viewTool;
@@ -936,9 +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");
@@ -1115,7 +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);
   }
 
@@ -1123,6 +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));
   }
@@ -1206,6 +1218,7 @@ public class Game : GameWindow {
   }
 }
 
+
 static class Program {
   static void Main(string[] args) {
     List<MonitorInfo> monitors = Monitors.GetMonitors();