Fullscreen canvas?

[tobi-wan-kenobi]

Hello,

I am searching for a possibility to draw a full-screen canvas, but I am running into some issues.

I am instantiating an ftxui::ScreenInteractive::Fullscreen() and later, in the renderer, use screen.dimx() and screen.dimy() to create the canvas.

Once the first event (keypress,...) is registered, the canvas resizes (from 0/0), but it's less than expected - on the horizontal, I'd estimate it's half of the full screen, on the vertical, it's hard to say - maybe a fourth?

I also tried playing around with ftxui::flex (thinking that maybe this helps), but no dice. The canvas is inside an ftxui::vbox, in case that makes a difference.

Any help would be much appreciated!

[ArthurSonzogni]

When using braille characters, we can display:

• 1x1 cells per cells
• 1x2 blocks by cells
• 2x4 brailles dot per cells.
  This explains why you see a difference of coordinate/size differences. The canvas uses a coordinate system scaled by 2x4.

What about using:

auto component = Renderer([] {
  auto my_image = canvas([] (Canvas& c) {
    c.DrawPointLine(0, 0, canvas.width(), canvas.height());
    c.DrawText(0, 0, "width = " + std::to_string(canvas.width()));
    c.DrawText(0, 2, "height = " + std::to_string(canvas.height()));
  });
  return my_image | flex;
}

auto screen = ScreenInteractive::Fullscreen();

This create a component, that will display a canvas "flexible", taking the whole size of the screen.

[tobi-wan-kenobi]

Ah, I see.

Many thanks for the detailed answer, I like the flex approach a lot!

Very, very cool project, by the way!

[ArthurSonzogni]

Thank you!