stm32f429i: ltdc display demo with text

[h2obrain]

• This is a new demo to dusplay functionalities of the ltdc display controller.
• Circe/Rectangle/Triangle drawing functions were copied from Chuck McManis simple-graphics
• The code is ordered badly and formatted worse.
• I made this version mainly to get some feedback on the code before I put hours in code cleanup work.

[ChuckM]

Ollie, when you look at the Adafruit Graphics library fro draw line it has:

// Bresenham's algorithm - thx wikpedia
void Adafruit_GFX::drawLine(int16_t x0, int16_t y0, int16_t x1, int16_t y1,
 uint16_t color) {
  int16_t steep = abs(y1 - y0) > abs(x1 - x0);
  if (steep) {
    _swap_int16_t(x0, y0);
    _swap_int16_t(x1, y1);
}
...

I suggest to avoid misunderstandings (and possibly litigation) in the future that you might want to express thanks to the Adafruit folks for code that helped you write this (Theirs is a pretty handy little library class, I started with it myself when I was putting together the simple graphics library repo).

[h2obrain]

okay, i'm closing this pull request for licensing reasons (and because my code is not well written anyway..)

[karlp]

well, that's whgat bresenhams is get gradiant, check steep, do shit. there's only so many ways to write it