This a tutorial can be used by the absolute FLTK beginner. In the course of the tutorial the most common widgets will be explained and you will gain a good. As you go through this tutorial, keep in mind that these are specific examples to help you see and learn FLTK. The most important piece of information you. I have posted the first (probably of several) tutorials about C++ and FlTk to help you do the project. These will be under Tutorials and the first.

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The purpose though is to show communicating widgets. The function run returns 0 and ends the program when all windows are closed or hidden.

Hence, SimpleWindow win goes out of scope and its destructor is called normally. Download the “Hello World” video. This is the basis for GUI programming. It is my hope that when you finish this tutorial you will be able to code your own FLTK applications with pleasure. First thing to flhk for is what include files need to be included. In the case of a button, the value of the button changes when it is pressed.

This section has a 13 minute Flash video you can watch using any browser with a shockwave flash plugin. Secondly, you will also get an entire directory full of example demo programs using most, if not all, FLTK widgets.

FLTK also supports idle, timer, and file pseudo-events that cause a function to be called when they occur. Tutoroal useful way to obtain information from the user is via the keyboard.



Our purpose is to learn how to compute the future tutorual of two objects after they have collided elastically with each other. The codes and the vimrc file is here. Simple Window with widgets that talk to each other. So, how do we encode this test.

FLTK Tutorial by Xu

This is where you need to type all the necessary code for the BasicWindow. Idle functions are called when no flt input is present and no timers or files need to be handled – in short, when the application is not doing anything. This greatly reduces code size and execution time.

Option 1 is easier but I personally recommend Option 2 for a couple of good reasons. EventWindow int width, int height: Although it’s tutotial pretty stable this tutorial is about 1.

They are most often used to monitor network connections sockets for data-driven displays.

Notice the garbage the label displays! But once people spend the time to learn it, they seem to really like it. So it will be deleted at the end of the tutoriial function scope.

Hence, Tutlrial have access to both the calling button and the input widget. The other is to call hide on all windows which will cause Fl:: Therefore, our code should resemble: We feably rely upon exit 0 to clean up for us.

This second inlined function has the actual callback code. Type the following lines code into this file, or copy them off of the demo web page. In this tutoriql of the tutorial we see how to simulate multiple circles colliding elastically with each other in real-time inside a two dimensional container. To find out more, including how to control cookies, see here: The labeltype method sets the type of label. Read them carefully then try again. This is usually done using the -I option:.


We can use a simple tutogial test on the widget we passed in. By looking at the other button declarations, we can see how to declare a button. BTW widgets don’t automatically store a copy of their label. Callbacks are a means of executing code when an event occurs. Feel free to try altering other aspects of the widgets such as labelcolor, label, labelsize, etc. In this case, a reference to the button ‘but’ is passed. FLTK supports normal, embossed, and shadowed labels internally, and more types can be added as desired.

We then use Gnuplot from inside our program by clicking a button in the GUI in order to plot the data saved in the text file.

C++ / FlTK Tutorial

There is more to be said about events later in the Events section. Newly created groups and their derived widgets implicitly call begin in the constructor, effectively adding all subsequently created widgets to itself until end is called.

One imporatant thing to keep in mind though is that if you have global objects then using hide may not be a good idea as those objects will not have their destructors called since they were not created in the main function scope.