Ive been recently really wanting to just render a mandelbrot set that i could later add functionality, but i cant figure out the details of the math on how to do it.
#Need help rendering a Mandelbrot set
inland arrow
function check(cx, cy) {
var _x = 0;
var _y = 0;
var x2 = _x*_x;
var y2 = _y*_y;
var iter = 0;
while ((iter < max_iter) && ((x2 + y2) < 4.0))
{
_y = 2*_x*_y + cy;
_x = x2 - y2 + cx;
x2 = _x * _x;
y2 = _y * _y;
++iter;
}
return iter < max_iter;
}
rapid mango
ty will do when i get home
inland arrow
Good to see you got it working. Presumably you know if you return the iter value instead of a boolean you can try to convert it to a color, to get some kind of shading.
The more you zoom in on the border the more colorful that approach gets.
rapid mango
Good to see you got it working. Presumably you know if you return the iter value...
will try
ill go do some reasearch
probably
inland arrow
make_color_rgb(cells[i][j] mod 256, 0, 0) will give a red shade. make_color_hsv(cells[i][j] mod 256, 255, 255) will do something across a color spectrum. Use that in draw_set_color() for each point you draw.
rapid mango
ok
im gonna modify the code so itll place the colors value for each pixel rather than just 0 or 1
wait so
nvm
im not gonna do that ill just do the thing in the draw event
rapid mango
`make_color_rgb(cells[i][j] mod 256, 0, 0)` will give a red shade. `make_color_h...
wait im confused its getting what value is it meant to get from cells[i][j]
nvm
oh
it works
inland arrow
Cool.
I basically meant put either iter in the cells or the color, but seems like you figured that out.
rapid mango
i basicallty just made it return the iterations if its not in the set
-1 means its in the set
inland arrow
If you want to eliminate the squash vertically, change the range of -1.25 to 1.25 by multiplying the cy value passed into the check() function by room_height/room_width.
rapid mango
also i was planning on something like a way to zoom with gui but it runs too slow for that
takes a good few seconds to render one frame and like 20 to actually generate it
inland arrow
There are tons of ways to speed up, but involves a lot of code.
inland arrow
I stopped a long time ago trying to make a fast mandelbrot after I used fractint.
I'm sure there are other tools these days, using shaders and whatnot (although the precision needed to zoom becomes a headache, but maybe some smart person worked around that too).
rapid mango
If you want to eliminate the squash vertically, change the range of -1.25 to 1.2...
very nice
inland arrow
Regardless of whether you pursue it further, it is always fun to have done it at least once.
inland arrow
Eh, your code was 95% there.