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type int = i32;
type char = i8;
type string = ptr(char);
extern func void(int) putchar;
extern func u64(string) strlen;
void printnum(int n) {
if (n < 0) {
putchar('-');
n = -n;
}
if (n == 0) {
putchar('0');
return;
}
while (n > 0) {
putchar('0' + n % 10);
n = n / 10;
}
}
int maxiter;
double lbound;
double rbound;
double tbound;
double bbound;
double hincr;
double vincr;
int mandeliter(double x, double y) {
double a = x;
double b = y;
double a2 = a * a;
double b2 = b * b;
int n = 0;
while (n < maxiter && a2 + b2 < 4) {
b = 2 * a * b + y;
a = a2 - b2 + x;
a2 = a * a;
b2 = b * b;
n = n + 1;
}
return n;
}
int main() {
maxiter = 32;
lbound = -2.0;
rbound = 1.0;
tbound = 1.5;
bbound = -1.5;
// hincr = 0.03125;
hincr = 0.0625;
vincr = 0.0625;
string shade = " .,-:!%@#";
int shadelen = cast(int)(strlen(shade));
double y = tbound;
while (y >= bbound) {
double x = lbound;
while (x <= rbound) {
int niter = mandeliter(x, y);
putchar(*(shade + niter*(shadelen-1)/maxiter));
// printnum(niter);
putchar(' ');
x = x + hincr;
}
putchar('\n');
y = y - vincr;
}
return 0;
}
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