Add highlighted target region for dissecting images.

OpenCVVideoParser/main.cpp

@@ -86,7 +86,10 @@ public:
 			}
 		}
 	}
-
+	vf2d upperLeft={-1,-1};
+	vf2d lowerRight={-1,-1};
+	bool cabDetected=false;
+	bool dragging=false;
 	bool OnUserUpdate(float fElapsedTime) override
 	{
 		// Called once per frame, draws random coloured pixels
@@ -98,6 +101,23 @@ public:
 			frameView-=fElapsedTime*60;
 			UpdateScreen();
 		}
+		if(!cabDetected){
+			DrawString({4,ScreenHeight()-40},"Drag over the region where the cab's screen is located.\n (Make sure the entire cabinet screen is covered)",WHITE,2);
+			SetPixelMode(Pixel::ALPHA);
+			FillRectDecal(upperLeft,lowerRight-upperLeft,{255,255,255,128});
+		}
+		if(GetMouse(Mouse::LEFT).bPressed){
+			if(!dragging){
+				upperLeft=GetMousePos();
+				dragging=true;
+			}
+		}
+		if(GetMouse(Mouse::LEFT).bHeld){
+			lowerRight=GetMousePos();
+		}
+		if(GetMouse(Mouse::LEFT).bReleased){
+			dragging=false;
+		}
 		return true;
 	}
 };