因为灰常有意思所以记录一下
代码
#include <stdio.h>
int main(int argc, const char * argv[]) {
float y,x,a;
for (y = 1.5f; y > -1.5f; y -= 0.1f) {
for (x = -1.5f; x < 1.5; x += 0.05f) {
a = x * x + y * y - 1;
putchar(a * a * a - x * x * y * y * y <= 0.0f ? '*' : ' ');
}
putchar('\n');
}
}
代码
#include <stdio.h>
#include <math.h>
float f(float x, float y, float z) {
float a;
a = x * x + 9.0f / 4.0f * y * y + z * z - 1;
return a * a * a - x * x * z * z * z - 9.0f / 80.0f * y * y * z * z * z;
}
float h(float x, float z) {
float y;
for ( y = 1.0f; y >= 0.0f; y -= 0.001f)
if (f(x, y, z) <= 0.0f)
return y;
return 0.0f;
}
void main() {
float z,x,v,y0,ny,nx,nz,nd,d;
for ( z = 1.5f; z > -1.5f; z -= 0.05f) {
for ( x = -1.5f; x < 1.5f; x += 0.025f) {
v = f(x, 0.0f, z);
if (v <= 0.0f) {
y0 = h(x, z);
ny = 0.01f;
nx = h(x + ny, z) - y0;
nz = h(x, z + ny) - y0;
nd = 1.0f / sqrtf(nx * nx + ny * ny + nz * nz);
d = (nx + ny - nz) * nd * 0.5f + 0.5f;
putchar(".:-=+*#%@"[(int)(d * 5.0f)]);
}
else
putchar(' ');
}
putchar('\n');
}
}
