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Showing content from https://arrayfire.org/docs/graphics_2fractal_8cpp-example.htm below:

ArrayFire: graphics/fractal.cpp

#include <stdio.h>

#include <cmath>

#include <cstdlib>

#include <iostream>

#define WIDTH 400

#define HEIGHT 400

using std::abs;

complex_grid(

width,

height,

zoom,

center[2]) {

(iota(

(1, height),

(width, 1)) - (float)height / 2.0) / zoom +

center[0];

(iota(

(width, 1),

(1, height)) - (float)width / 2.0) / zoom +

center[1];

return complex(X, Y);

}

mandelbrot(

&in,

iter,

maxval) {

for (int ii = 1; ii < iter; ii++) {

Z = Z * Z + C;

cond = (abs(Z) > maxval).as(

);

C = C * (1 - cond);

Z = Z * (1 - cond);

}

return mag / maxval;

}

float mx = af::max<float>(a);

float mn = af::min<float>(a);

return (a - mn) / (mx - mn);

}

int main(int argc, char **argv) {

int device = argc > 1 ? atoi(argv[1]) : 0;

int iter = argc > 2 ? atoi(argv[2]) : 100;

bool console = argc > 2 ? argv[2][0] == '-' : false;

try {

printf("** ArrayFire Fractals Demo **\n");

float center[] = {-0.75f, 0.1f};

for (int i = 10; i < 400; i++) {

int zoom = i * i;

if (!(i % 10)) {

printf("iteration: %d zoom: %d\n", i, zoom);

fflush(stdout);

}

c = complex_grid(WIDTH, HEIGHT, zoom, center);

mag = mandelbrot(c, iter, 1000);

if (!console) {

if (wnd.close()) break;

mag_norm = normalize(mag);

wnd.image(mag_norm);

}

}

fprintf(stderr,

, e.

());

throw;

}

return 0;

}

Window object to render af::arrays.

A multi dimensional data container.

dim4 dims() const

Get dimensions of the array.

void eval() const

Evaluate any JIT expressions to generate data for the array.

Generic object that represents size and shape.

An ArrayFire exception class.

virtual const char * what() const

Returns an error message for the exception in a string format.

@ f32

32-bit floating point values

@ AF_COLORMAP_SPECTRUM

Spectrum map (390nm-830nm, in sRGB colorspace)

AFAPI array abs(const array &in)

C++ Interface to calculate the absolute value.

AFAPI array sqrt(const array &in)

C++ Interface to evaluate the square root.

array & eval(array &a)

Evaluate an expression (nonblocking).

AFAPI void setDevice(const int device)

Sets the current device.

AFAPI array max(const array &in, const int dim=-1)

C++ Interface to return the maximum along a given dimension.

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