more crop progress

Program.cs

@@ -639,6 +639,7 @@ public class Game : GameWindow {
   int ribbonIndex = 0;
   Vector2i mouseDragStart;
   Vector2i mouseDragEnd;
+  float activeScale = 1f;
   Shader shader = new();
   Matrix4 projection;
   float zoomLevel = 0f;
@@ -737,6 +738,11 @@ public class Game : GameWindow {
       photoIndex -= 5;
     }
 
+    // FIXME: crop should be a modal tool that starts with C and ends with Enter or Escape.
+    if (input.IsKeyPressed(Keys.C)) {
+      ApplyCrop();
+    }
+
     if (input.IsKeyPressed(Keys.P) && altIsDown) {
       ExportPhotos();
     }
@@ -993,7 +999,11 @@ public class Game : GameWindow {
     SwapBuffers();
   }
 
-  void DrawCropBox() {
+  // left, right, top, bottom
+  (int, int, int, int) GetCrop() {
+    // FIXME: this expects the start point in the top left and the end point
+    // in the bottom right; some sign flipping needs to occur to make anchors
+    // in other direction work well.
     Vector2i start = mouseDragStart;
     Vector2i end = mouseDragEnd;
     end.Y = Math.Min(end.Y, start.Y + (end.X - start.X) * 4 / 6);
@@ -1002,6 +1012,20 @@ public class Game : GameWindow {
     int right = Math.Max(start.X, end.X);
     int top = Math.Min(start.Y, end.Y);
     int bottom = Math.Max(start.Y, end.Y);
+    return (left, right, top, bottom);
+  }
+
+  void ApplyCrop() {
+    var (left, right, top, bottom) = GetCrop();
+    int area = (right - left) * (bottom - top);
+    if (area < 100) {
+      return;
+    }
+
+  }
+
+  void DrawCropBox() {
+    var (left, right, top, bottom) = GetCrop();
     int area = (right - left) * (bottom - top);
 
     if (area < 100) {
@@ -1032,10 +1056,12 @@ public class Game : GameWindow {
     if (zoomLevel > 0f) {
       scale = zoomLevel;
     }
+    activeScale = scale;
 
     Vector2i renderSize = (Vector2i) (((Vector2) active.Size) * scale);
     Vector2i center = (Vector2i) geometry.PhotoBox.Center;
-    Box2i photoBox = Util.MakeBox(center.X - renderSize.X / 2, center.Y - renderSize.Y / 2, renderSize.X, renderSize.Y);
+    // Box2i photoBox = Util.MakeBox(center.X - renderSize.X / 2, center.Y - renderSize.Y / 2, renderSize.X, renderSize.Y);
+    Box2i photoBox = Util.MakeBox(0, 0, renderSize.X, renderSize.Y);
     DrawTexture(active, photoBox);
     for (int i = 0; i < 5; i++) {
       Texture star = (activePhoto.Rating > i) ? STAR_FILLED : STAR_EMPTY;