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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C++ / FlTK Tutorial

So it will be deleted at the end of the main function scope. However, the button continues to exist in the main scope. However, the “set” methods do not call redraw – you have to call it yourself.

So there is no penalty for making two functions. In this part of the tutorial we see how to simulate multiple circles colliding elastically with each other in real-time inside a two dimensional container. In other words, it makes it visible. The resulting program will display the window in Figure 4. However, I always like to learn by example so I coded a small program to display almost every event.


This program just copies whatever is in “In” to “Out” when “Copy” is pressed. Expand if necessary the source files folder.

FLTK Tutorial by Xu

Try clicking on the window with each mouse button. Now that we have our file saved, we can compile our program. This might encourage you to learn console commands the true power behind Linux and maybe even makefiles. Callbacks are functions that are called when the value of a widget, a button in this case, changes. In an elastic collision both the total momentum and kinetic energy of the system are conserved. Keep this in mind. Note that in this particular case it is unneccessary as the methods called on ” b ” are all of the base widget class members.

Who or what deletes the dynamically allocated window widget ‘ win ‘?

So, at this point we can go back to our code and add this line in the list of includes. This is copied from fltk general newsgroup date Jan 17 What’s important is that this member function will NOT redraw the widget. Now, what does this callback function need to include. More about userdata later. Second you must manually keep track of the widget indices ie 0,1,2,3 etc.

By looking at the other button declarations, we tltk see how to declare a button. First thing we should always do before adding a new component ttutorial consult the documentation for the component at the FLTK documentation site. We can use a simple if test on the widget we passed in. First thing to look for is what include files need to be included. But if you are a paranoid MS Windows user and don’t like downloading anything.


FLTK also supports idle, timer, and file pseudo-events that cause a function to be called when they occur. Now, using the previously mentioned methodology, build and run this application. It is my hope that when you finish this tutorial you will be able to code your own FLTK applications with pleasure. They are most often used to monitor network connections sockets for data-driven displays.

Fktk int width, int height: This section has a 13 minute Flash video you can watch using any browser with a shockwave flash plugin.

Although it’s already pretty stable this tutorial is about 1. Through inheritance, you can override certain functionalities of each widget, and configure it to suit your own application, without the need to code everything from scratch.

Download the “Hello World” video.