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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First thing to look for is what include files need to be included. The way to overcome this is by having two functions. The width and height parameters determine the size of the widget or window in pixels. Idle functions are called when no user input is present and no timers or gltk need to be handled – in short, when the application is not doing anything.

FLTK tutorial

Finally, the last line gets the value from the input widget and sets it to the value of the output widget. However, I have added public pointer members of all the widgets I want to add to my window. 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.


Instead of streaming it from this site everytime. Please let me know if you have any questions, comments or suggestions. At this point you should see a cursor blinking in the editor window. Now, what does this callback function need to include. So simple and powerful.


As the simulation is taking place, we are also able to change the speed of the circle through a slider input. Okay time to look at some code. But how does the window get deleted. I don’t call delete. They tutoriial the method for having member function callbacks.

C++ / FlTK Tutorial

To create the button, we just need to specify a location on the window, a width, a height, and a label. Listing 1 – “hello.

Finally, you can use the fltk-config script to compile a single source file as a FLTK program:. I don’t recommend anyone use IE Internet Explorer browser anytime. This is a very beautiful aspect of FLTK. Feel free to try altering other aspects of the widgets such as labelcolor, label, labelsize, etc. Callbacks are functions that are called when the value of a widget, a button in this case, changes.


It is my hope that when you finish this tutorial you will be able to code your own FLTK applications with pleasure. First off, we need to choose a button type for this flltk we are going to create. In other words, it makes it visible.

In our “Hello, World! FLTK provides a pretty simple way to handle keyboard events. Yes, FLTK will delete the children of the window when the window gets deleted or goes out of scope as in the first example. Although it’s already pretty stable this tutorial is about 1.

Mouse events are extremely important to handle because it is the most common input device used to interface with GUIs. Therefore, we must utilize some casting to do the job. In this example, myGroup would be the current group. Hope you do too.

This is usually done using the -I option:. We feably rely upon exit 0 to clean up for us. Timer functions are called after a specific amount of time has expired. The damage 1 tells FLTK that the widget needs to be redrawn.