I am one of those people, because I see the examples and the text box but nothing appears to occur when I use it or try any of the examples.
Tried Chrome and FF (and disabling extensions), so I thought I was just doing it wrong.
However, I did a little more digging because of the discussions, and I think the button that I am supposed to click is hidden http://i.imgur.com/kI8TrfE.png
I dont know how this is happening across both browsers though, but I thought I would leave this here if anyone else is confused as I was.
Update:
After trying a few things, stretching the screen width made the button pop up.
- the 'Try It' button disappears behind a text box if the browser window is too narrow, making you unable to use the tool. (edited after hobs' reply)
- 0 is black, 1 is white (and so is larger than 1).
- if a,b is on top of the stack, then - pops b and a and puts (a-b) on the stack
- the value on top of the stack (after the entire string was processed by the stack machine) will determine the final colour of the pixel
- the algorithm runs for every pixel, that's why it's kinda slow