Text animation

[gargamel]

Hi

what should i use to make a text move from one side of the screen to the other ? any suggestion please ?

Thx

[Joel Bodenmann]

Hello gargamel and welcome to the community!

There is currently no "animation" support/module in the µGFX library. You will have to implement this yourself.

Basically you just need to write text and then pixel-shift it. However, calling any of the gdispXxxStringXxx() string drawing functions each time in a loop will require a lot of CPU power. Therefore, we strongly recommend using PixMaps for this one.

Pixmaps are actually intended for a use like that. As described in the documentation, a pixmap is nothing but a virtual display in your memory. Once you created a pixmap, you write the text to it (once). Then, all you need to do is rendering the same pixmap over and over again but just a different location.

There is actually a complete, 1:1 example in the documentation as well as in the uGFX library directory showing how to do exactly that but with an image instead of text.

Please do not hesitate to ask should you have any questions.

~ Tectu

[Joel Bodenmann]

One more thing: There are many display controllers out there who actually have a scrolling feature implemented in hardware. This would vastly increase performance as everything happens inside the display controller and not inside your CPU.

We would recommend you checking whether you display controller supports such a feature.

~ Tectu