58 lines
1.3 KiB
C
58 lines
1.3 KiB
C
#include <stdio.h>
|
|
#include <omp.h>
|
|
#include <math.h>
|
|
#include <stdlib.h>
|
|
#define X_PIXEL 1000
|
|
#define Y_PIXEL 1000
|
|
|
|
double scaled_x(int x) {
|
|
return -2.5 + (3.0 / X_PIXEL) * (double)x;
|
|
}
|
|
|
|
double scaled_y(int y) {
|
|
return -2.0 + (4.0 / Y_PIXEL) * (double)y;
|
|
}
|
|
|
|
int main(int argc, const char *argv[])
|
|
{
|
|
double start = omp_get_wtime();
|
|
|
|
char picture[X_PIXEL][Y_PIXEL];
|
|
for (int px = 0; px < X_PIXEL; px++)
|
|
for (int py = 0; py < Y_PIXEL; py++)
|
|
{
|
|
double cx = scaled_x(px);
|
|
double cy = scaled_y(py);
|
|
double x = 0.0;
|
|
double y = 0.0;
|
|
int i = 0;
|
|
int max_i = 1000;
|
|
while(i < max_i && x*x + y*y < (1 << 16))
|
|
{
|
|
double x_tmp = x*x - y*y + cx;
|
|
double y_tmp = 2*x*y + cy;
|
|
x = x_tmp;
|
|
y = y_tmp;
|
|
i++;
|
|
}
|
|
if (i == max_i) {
|
|
picture[px][py] = '*';
|
|
} else {
|
|
picture[px][py] = ' ';
|
|
}
|
|
}
|
|
|
|
double end = omp_get_wtime();
|
|
|
|
// We downscale the image
|
|
// by only printing one in twenty pixels
|
|
for (int x = 0; x < X_PIXEL; x+=20) {
|
|
printf("\n");
|
|
for (int y = 0; y < Y_PIXEL; y+=20)
|
|
printf("%c", picture[x][y]);
|
|
|
|
}
|
|
|
|
printf("\nComputation took %f seconds\n", end - start);
|
|
}
|