C#

private void picFloorPlan_MouseMove(object sender, MouseEventArgs e)
{
    lbStatus.Text = string.Format("{0}x / {1}y", e.X, e.Y);
}

class Room {
    string name;
    string comment;
    Color color;

    public Room(string name, string comment, int R, int G, int B) {
        this.name=name;
        this.comment=comment;
        this.color=Color.FromRGB(R,G,B);
    }
}

class MyApp {
    void CreateRooms() {
        List<Room> rooms=new List<Room>();
        rooms.Add("Kitchen", "check smoke alarm once a year", 255, 0, 0); // <<< hovered color
        rooms.Add(...);
        ...
    }
    ...
    void Image_MouseMove(...) {
        // don't forget to add boundary checks and error handling
        Color color=shadowImage.GetPixel(e.X, e.Y);
        Room room=null;
        if (rooms==null) CreateRooms();
        foreach(Room r in rooms) if (r.Color == color) room=r;
        if (room!=null) {
            // you are inside this room! go tell the user
            ...
        }
    }
}

Luc Pattyn wrote:

Will this turn into a CP article?

Luc Pattyn wrote:

If so, do you want any help?