Old Change Logs

Made the file chooser windows use toggle_buttons instead
of normal buttons.

Made the cmake makefile not print a message when libpng isn't installed.

   - Added a toggle_button object.  
   - Changed the check_box and radio_button objects to be specializations of the
     new toggle_button object.  This is a nearly backwards compatible change
     except that the events registered to check_box and radio_button clicks
     must now take the form void event(toggle_button&) or void event(void) 
     instead of the previous void event(check_box&) and void event(radio_button&) 

   - Made queue_sort take an optional compare functor
   - Made the file chooser window sort files and directories with a 
     case insensitive sort.

Made the spec more clear.

Made the specs more clear

Clarified some comments and also changed the Open button in the file selection window
to be called Ok instead.  

   - Added a single click event to list_box
   - Added a save_file_box() and open_existing_file_box() function.  Also
     generally improved the file selection box.

Added the vector_to_matrix() function.

   - Added a cholesky_decomposition() function.
   - made the equal() function take the epsilon to use as a
     third argument and also made the default epsilon a little 
     bigger.

Moved the is_matrix template into the is_kind.h header.

Changed the preprocessor checks for the wchar_t overload of is_built_in_scalar_type 
so that it works better with visual studio.

Added a #ifndef __MINGW32__ to exclude a function that uses wchar_t 
and iostreams in a way that mingw apparently doesn't support

Fix compile error in test GUI

Added a test that catches that bug in the join tree stuff
I just fixed.

Fixed a bug in the bayesian_network_join_tree object that caused it to
compute incorrect results for some networks.

Modified the directed_graph_drawer so that you can't add edges back
to the same node or add edges going the opposite way as existing
edges.

Changed the text_grid so that it repaints itself correctly
when you change the background color of a grid element.

Added a missing return statement.

Made node_cpt_filled_out() also check if the probabilities 
sum to 1.0

Made the graph modified event always get dispatched before any
more specific events.

Added the requirement that the bayesian network not be empty to the
bayesian_network_join_tree object.

Added a graph modified event to the directed_graph_drawer
widget.

Changed code to suppress compiler warning.

   - Cleaned up the specs a little
   - Added the node_first_parent_assignment(), node_next_parent_assignment(), and 
     node_cpt_filled_out() functions.

Changed the spec of the assignment object to say that it enumerates 
its contents in sorted order.

Added the empty_table() function to the conditional_probability_table object.

   - Added a const version of the directed_graph_drawer::graph_node() function
   - Fixed a bug in the text_grid widget

   - Changed the functions that control text color in the label and text_field
     widgets to use rgb_pixel objects.  Also added a function to set the
     background color of a text_field.
   - Changed the color of the circle that shows that a node in a directed_graph_drawer
     is selected from red to blue.

Fixed some issues with how the text_field drew the cursor

Changed the directed_graph_drawer so that it only does something with
keyboard input if it was the last thing the user clicked on.

Changed the directed_graph_drawer so that when you click on a
node that is already selected it doesn't generate any node 
selected/deselected events.

Made the tabbed_display's enable and disable methods also 
enable and disable all the things it contains.

   - Fixed a bug in the scrollable_region where show() would
     show the scroll bars when it shouldn't have.
   - Fixed a bug in the tabbed_display where it didn't redraw itself
     correctly after it was moved by set_pos()
   - Added the fit_to_contents() function to the tabbed_display 
     widget.

Added an event to the text_field so you can tell when the
user modifies it.

Removed an unnecessary constructor argument from the widget_group.

Fixed a bug in the menu_bar widget.  One of the members wasn't being 
initialized when it needed to be.

  - Changed the DLIB_ASSERT and DLIB_CASSERT so that they
    return the name of the function they are in (if __FUNCTION__ is
    available) as well as the file and line number.
  - Changed the way wchar_t is handled in the serialize.h file.  Now
    everything should compile correctly in visual studio regardless of how
    you set the /Zc:wchar_t compiler option.
  - Suppressed some compiler warnings in the directed_graph regression test.

Made ASSERT print the name of the function that contains it
if the __FUNCTION__ macro is available.

   - Changed the xml parser so that it counts line numbers
     from the start of the input stream instead of from the
     root tag
   - Changed the code so that you will only get the fatal_error
     event once if it occurs. 

Changed the text_grid so that the cursor may enter non-editable grid
boxes but just can't modify them.

renamed the text_grid_display to just text_grid

Added the text_grid_display widget

Made the scrollable_region not scroll with the mouse wheel when
it is disabled or hidden.

   - Added some missing mutex locks to the zoomable_region and
     scrollable_region widgets
   - Changed the scroll_bar::set_length() function so that if
     you specify a length of 0 it will force the scroll_bar
     to be length 1.  This avoids some weirdness with other widgets
     trying to determine the width of a scroll bar when the
     scroll bar is actually an empty rectangle due to having
     0 length.

   - Made the scroll_bar widget use longs instead of unsigned longs
     in reference to scroll bar positions.  Also removed the
     requires clause on the set_slider_pos() since that function now
     saturates the input at the min and max slider position.
   - Added the scroll_to_rect() function to the scrollable_region

Reverted the recent change where I made drawable::lastx and 
drawable::lasty not match the current location of the mouse inside
the on_mouse_move() event.  I changed this back to how it was before,
so now lastx and lasty represent the most current record of where
the mouse is in *all* events.

Fixed a bug in the compute_cursor_rect() function.  It would return an
incorrectly positioned rectangle for 0 length strings.

Fixed a minor bug in the cursor drawing of the text_field
gui widget.

Made the scrollable_region's mouse wheel event trigger
for the entire widget rect rather than just the display_area

Changed the code to suppress a compiler warning.

Added the scrollable_region gui widget.

made the spec more clear

Fixed a bug in the tooltip widget that was triggered when calling
its member functions without calling set_tooltip_text().

  - Removed the fill_rect() call from the zoomable_region widget.  
  - Added a fill_rect() call to the directed_graph_drawer now that there isn't
    one in the zoomable_region.

Made the specs more clear

Made the specs more clear

Added some missing asserts and what not to the zoomable_region and
directed_graph_drawer widgets.

Fixed the directed_graph_drawer so that it won't ever draw txt outside
the display rectangle.

   - Changed the first_pixel field of the draw_string() function 
     to be a rectangle like all the other draw functions now use.
   - Added an area field to the end of the draw_image(), 
     fill_rect_with_vertical_gradient(), and draw_rounded_rectangle()
     functions.

Fixed some annoying things about the zoomable_region gui widget

Fixed a problem in the draw_circle and draw_solid_circle functions.
They didn't draw themselves quite correctly in all cases.

Fixed some issues with the directed_graph_drawer and also made the
zoomable_region use vector<double> for graph space points instead
of point objects.

Added the directed_graph_drawer gui widget

Added the zoomable_region gui widget

Added some missing asserts as well as more stuff to the gui
test.

Added a missing edge_type typedef and a rebind template to the
directed_graph object.

Made the X11 repainting more efficient.

Added the background_color() function to the drawable_window so that
you can query its background color.

Fixed some bugs in the new version of the draw_circle() and draw_solid_circle() 
functions.

Fixed #include

Modified the draw_circle() and draw_solid_circle() functions so that they
only touch each canvas pixel once.  This avoids messing up alpha blending
if an rgb_alpha_pixel is used.  

Added a normlize() function for matrix objects.

Added the nearest_point function.

Added another overload for centered_rect()

   - Changed the radius of the circle drawing functions to be a double 
     instead of unsigned long
   - Made a bunch of the drawing functions take a rectangle that defines 
     which part of their object they are to draw. 

Added missing #include

Added a missing #include

Added an icon style for the button widget

Added an overload of centered_rect() that takes a rectangle and returns
a new one with a different width and height but centered at the same point.

Made the popup_menu's hotkey recognition case insensitive

Made the specs more clear

   - Added the png_loader object from Nils Labugt.
   - Fixed a compiler warning in a drawing function.

Added another button style

Shank the padding between menu items slightly

Added the menu_item_submenu and also improved the popup_menu object.

  - Added Nils's name to some headers
  - Changed the default font to a nicer Sans Serif font
    since I'm apparently alone in liking Serifs.

Removed code to detect duplicate on_mouse_move events since the
gui_core now make sure it doesn't emit any such events.

Added some code to ensure that you never get duplicate 
on_mouse_move() events.

Added edge data to the directed_graph.  Note that this breaks 
backwards compatibility with the previous serialization format
for directed_graphs.

Changed all the drawing functions so that the arguments 
go canvas, position, thing to draw.  So now they all have a 
uniform interface.

improved the popup_menu

Undid the last change.  Instead of sending non client area mouse clicks
to on_mouse_down() they now go to on_focus_gained() and on_focus_lost()
so that clicking on non client area things matches what happens in X11.

Changed the on_mouse_down() event so that it receives mouse down
events for the non client area of the window (e.g. the title bar)

Modified the drawable_window so that the drawable::lastx and drawable::lasty
fields are updated after calls to on_mouse_move.  This way the x and y that
go into the on_mouse_move actually tell you something.

Also fixed a bug in the menu_bar

Removed unnecessary requires clause on some rectangle functions.

Fixed a bug in the menus and made them look a little nicer.

Worked on the popup menus some more

Made the base_window::show() function put the window on the top
of the z-order

Made base_window::hide() virtual

Changed stuff so that the popup_menu works right on windows.

Added the popup_menu and menu_bar widgets.  They aren't quite finished 
yet though.

made the spec more clear

Fixed spelling error in spec

Improved the fill_rect_with_vertical_gradient() function

  - Added the resize_rect_height() and resize_rect_width() functions
  - Fixed a bug in the resize_rect() function

Added comments to spec

Made the tooltip window take a little longer to popup

Removed the old win32 only gui code.

Added tooltips to button objects

   - Added a tooltip widget
   - Fixed a typo in the image_widget spec that said it was abstract

Changed the default position for a rectangle to (0,0) instead of (1,1)

Renamed the button_style draw function to draw_button

update spec

Added an include

Gave button styles the ability to redraw the button when the mouse
moves over it.

   - Added the mouse_over_event object to the base_widgets and made the button_action
     inherit from it.
   - Added the next_free_user_event_number() so that we can actually have a safe
     way of using user events when objects inherit from other objects that
     already use user events.

Changed the gui button so that it has a user selectable style.

Added the centered_rect(), translate_rect(), move_rect() and resize_rect()
functions.  Also added a new rectangle constructor.

Fixed another bug in the GUI set_pos() and set_size() functions.

   - Made the functions for drawing on canvas objects take points and pixels instead of
     just a bunch of integers.  
   - Also moved them into the canvas_drawing.h file.
   - Added the draw_rounded_rectangle() and fill_gradient_rounded() functions
     from Nils Labugt.

Fixed grammar and spelling

Made the load_bmp() function more robust in the face of weirdly 
written BMP files.

Applied the patch from Nils Labugt that ads support for more keyboard modifier keys 
such as the alt key.  

Fixed a bug in the win32 version of the gui_core component.  It was possible that 
calling set_size(), set_pos(), or set_title() could cause the program to deadlock.

Added some missing error checking to the load_dng() function.

Fixing point serialization again.

Changed the point serialization because it apparently doesn't
work right in some versions of visual studio.

Fixed a bug in the floating point serialization code.  It 
didn't handle NaN or infinities correctly.

Added missing std:: qualifier

Added some more matrix tests.

Added the area() function to the rectangle object.

   - Added the point class as well as a bunch of convenience functions
     and automatic casts between points, rectangles, and vectors.

  - Added a get_rect() for matrix objects. 
  - Added a subm() function that takes rectangles
  - Added a rectangle::contains(const rectangle&)

Removed this folder now that its source files are in the geometry 
folder.

Moved the vector object into the geometry folder.  Also removed the kernel_1a
stuff.  So there is now only one possible vector implementation.

Moved the rectangle object from the gui_core into a new geometry folder.

Fixed a typo in a DLIB_ASSERT message.

Fixed a typo in specs

Added squared() and cubed() matrix functions. 

Renamed atom() to array_to_matrix()

Added a size() function to matrix_exp and matrix_ref objects.

Made the svm stuff templated such that it can operate on scalar
types of float, double, or long double instead of just double.

Fixed a spelling error

Added an optimization to the working set selection for the svm training code.
Now the algorithm will prefer to select indices that are in the kernel 
matrix cache when possible instead of ones that aren't.  In the data I tested
this resulted in as much as a 10% speed boost when only a small part of the
kernel matrix was cached.

Fixed a bug in the svm_nu_train_prob() function.

Changed the svm train functions so that the cache_size argument
now measures the max number of megabytes of memory to use rather
than number of kernel matrix rows to cache.  It's default
value is now 200MB.

updated the svm spec

   - Added the probabilistic_decision_function object and svm_nu_train_prob() 
     function.
   - Fixed a bug in the decision_function's copy constructor.

Fixed a bug in the trim, rtrim, and ltrim functions.  They
didn't return empty strings when the input string contained all
trim characters.

Fixed typo in spec

Made docs more clear

Tried to make the docs more clear.

Added another constructor to the thread_function object.  
Now it can take proper function objects as well as normal function
pointers.

Added the polynomial_kernel and also made the decision_function 
return the margin instead of forcing the value to +1 or -1.

Fixed a typo in the spec

Changed some class keywords to typename

Finished the std_vector_c object.  

Added a class that wraps std::vector and checks its function's 
preconditions.

Added some push/pop_back() functions to the array object that are similar
to the ones in the std::vector.

Changed code to avoid a compiler warning about an initialized variable.

Changed the svm_nu_cross_validate() function to return a vector
of both the +1 and -1 cross validation accuracies.

Added the atom(), rowm(), colm(), and subm() matrix functions.

Fixed canvas::fill() gui function so that it should work right
on 64 bit platforms.

Fixed a bug in the list_box that caused it to not hide itself properly
when told to do so.

Made the specs for the assign_pixel() function more clear.

Added a version of the drawable::draw_line() function for 
array2d objects.

Made the pinv() specs more clear.

   - Added a regression test for the equalize_histogram() function
   - Made the equalize_histogram() function pass the memory manager
     type from the input image along to the matrix it uses 
     internally.

Added typedefs to everything that uses the memory manager so that
any templates can figure out what type of memory manager is being
used.

   - Suppressed a compiler warning in the queue about an initialized variable.
     To do this I had to create the assign_zero_if_built_in_scalar_type() 
     function as well as the is_built_in_scalar_type template.

Fixed the mlp with regards to the recent changes to the rand object.

Switched the arguments to array2d::set_size since I missed this one
call when I changed the array2d object recently.

Made the startup of the X11 code more robust.  In particular, it 
now works in more instances on Mac OS X.

Changed all the image processing functions so that they don't use or make
reference to the enumerable interface part of the array2d object.

Changed cast to suppress compiler warning

Added casts to suppress compiler warnings from Visual Studio

   - Changed load_bmp() so that it works correctly using all istreams rather than
     just ifstream objects.  Specifically, I removed the use of pubseekpos() 
     since this function often only makes sense for input file streams.
   - Added a 16bit gray level DNG image type.  This means that now images that 
     contain 16bit gray level pixels will be saved exactly rather than 
     be converted to 8bit gray scale pixels.
   - Generally made the code more robust and added some regression tests
     for the image IO stuff.

   - Removed the width() and height() functions from the array2d.  Now only the
     equivalent nc() and nr() member functions remain.
   - Changed array2d::set_size(width,height) to set_size(num_rows, num_cols).  
     That is, I switched the order of the two arguments to this function.
     The reason for doing this is to make it have the same form as the
     set_size() member of the matrix object.  This way the usage of the
     set_size() member for these two very similar data structures is 
     the same.  Hopefully this will reduce confusion rather than 
     make things worse.

Fixed a bug in this test.  It would sometimes say an 
error occurred when one hadn't.

Updated due to the change in the compress_stream object.  

Added a checksum to compress_stream_kernel_1 and kernel_2.  Note that this 
breaks backwards compatibility with the previous versions that didn't have 
this checksum.

Added memory manager support to the matrix object.

Updated the testing stuff

Added some more tests

  - Fixed a potential divide by zero in the new queue 
    sorting code.
  - Fixed an old bug in the queue_kernel_2 object 
    where it didn't work correctly with the 
    non-default memory managers.

Added some more tests to the queue regression test.

Made the queue_sort_1 use a better sorting algorithm.  In particular, it 
will not sort slowly for nearly sorted data anymore.

Fixed a bug in the cat() function that caused the state of the queue
to be broken if you called cat with an empty queue.

Made the specs more clear

reran make dep

Fixed a bug in the image_widget.  It didn't repaint the screen
all the way if you gave it a smaller image to display.

  - Cleaned up the test suite code a little and also changed
    the perform_test() function so that instead of returning a bool
    to indicate test failure it now returns void but throws an 
    exception in the event of a failed test.
  - Added some example tests

removed a bunch of compiler warnings

Suppressed a compiler warning

Added some casts to avoid warnings in visual studio

Changed the gui painting code so that it holds on to the memory used 
in the canvas object forever rather than reallocating it each time
part of the screen needs to be repainted.

Fixed a reference to the old rand objects.

Changed inclusion guards to a more sensible name

updated the rand tests

Renamed rand::get_random_number() to get_random_8bit_number() and also added
a get_random_16bit_number() and get_random_32bit_number()

Renamed rand kernel 3 to kernel 1 in the source code

Renamed rand kernel 3 to kernel 1

Removing rand kernel 1 and 2 because they are extremely inferior to 
rand kernel 3 and thus should never be used.

Made these tests run way faster.

Removed the code to decompress the default font on program startup.
It now gets decompressed on the first call to default_font::get_font().

Made the assign_pixel() function saturate grayscale values bigger
than the target pixel type can handle.  Also updated the code
so that other functions no longer do this them selves but
rely on assign_pixel() for this functionality.

Added a regression test specifically for the serialization of
standard C++ types.

ran make dep

Modified to avoid compiler errors and warnings in 
visual studio 2008

Updated the pixel_traits template for the pixel in the gui core.

Added the hysteresis_threshold() function

fixed a spelling error in a spec

   - Cleaned up the code more and added some missing specs
   - Added the assign_border_pixels() function
   - Added the zero_border_pixels() function

Changed the edge detection stuff around

Added a metaprogramming regression test stub 

Added the is_signed_type and is_unsigned_type templates

Added another overload of assign_pixel that can take long integers.

Added a sobel edge detector.  Need to write specs and clean up code still.

Fixed a typo in a function prototype

Added a stub regression test for the image processing stuff

   - Added assign_all_pixels()
   - Cleaned up the code a little

  - Added the auto_threshold_image() function
  - Added the get_histogram() function
  - Added the use_abs argument to the spatially_filter_image() function

Changed the code slightly to suppress a compiler warning

   - Initialized an uninitialized variable
   - Added a mutex lock on the default_font::get_font() function
     to make sure it is always thread safe.

Fixed a bug in the assign_pixel() function that was introduced
in the last commit.

  - Changed the pixel_traits structure so that it can support 8, 16, and 32 bit 
    grayscale pixels.  
  - Added the assign_pixel_intensity() function
  - Added the get_pixel_intensity() function
  - Added the binary_union() function
  - Modified the existing image processing functions to better support
    the various grayscale pixels

Changed the spec for array2d::set_size() to be more reasonable and also
to reflect better what actually happens.

Made the spec not say you can only use char or wchar_t types

Fixed the spec for the edge function

made the specs more clear

Fixed a typo in the spec

Replaced some tabs with spaces

   - Added the set_main_font() and main_font() functions to the drawable object.
     So now the drawable widgets can use a user provided font.  
   - Made the named_rectangle object a little easier to use.  It now won't
     let you size it so small that it doesn't display its entire name.

Fixed a bug in the compute_cursor_pos() function where it would 
return the incorrect value.  This bug was introduced in the 
previous release.

Cleaned up the code and made the svd code more numerically stable.

Added a size() function to the matrix object.

fixed a typo in the spec

Added the randomize_samples() function and also cleaned up the svm code a little 
and made it more robust.  There was also a bug that was triggered with certain 
unusual inputs to the svm_nu_train() function that has been fixed.

Fixed a compile bug on mac os X

Fixed some build errors in visual studio and 
suppressed some warnings as well.

Added some missing includes

removed some cruft

Cleaned up the code more.  Added some tests for the bayesian network stuff and
found and fixed some bugs.  Also made everything serializable. 

Cleaned up the code more.  It is finally in reasonable shape.

Continued to clean up this code

cleaned up the code

cleaned up the code more

Cleaned this up more.  Still more to do though

Initial checkin of bayesian stuff.  Code needs a lot of cleanup.

Renamed the item member of the graph nodes to data for clarity.

Added get_random_double() 

Added a missing assert statement

added some tests

made copy graph structure work right even if the two objects
passed to it are actually the same instance 

made this code more robust

Made the create_moral_graph() function not move the
node items over to the moralized graph.

Made the requires part of is_join_tree a little more
appropriate and also added the missing assert statements.

Added a bunch of set utilities and also added the edge() and is_join_tree() 
function.

added some tests related to edge() function calls.

updated due to new template argument

Added edge data to the graph object.

   - Added the set_intersection_size() function
   - Added the create_join_tree() function
   - Added the copy_graph_structure() function

fixed #include file error

  - Implemented the triangulate_graph_and_find_cliques() function
  - Added the graph_contains_length_one_cycle() function
  - Added the find_connected_nodes() function
  - Added the graph_is_connected() function
  - Added the is_clique() function
  - Added the is_maximal_clique() function

Added typedefs to the node_types that let you figure out
what kind of graph contains them.

Cleaned up the cmake makefiles

Added a workaround for a bug in visual studio 7.1

Added a test project for the gui stuff

   - Added the create_moral_graph() function
   - wrote the spec for the triangulate_graph_and_find_cliques() function

Made the test more portable

The mingw version of gcc apparently doesn't have a 
std::wostringstream so I switched it to 
std::basic_ostringstream<wchar_t>

Fixed a compile time bug in visual studio 7.1

updated makefile

Improved the tests for the graph objects and fixed a 
deserialization b