#include

int main() {

for (float y = 1.5f; y > -1.5f; y -= 0.1f) {

for (float x = -1.5f; x < 1.5f; x += 0.05f) {

float a = x * x + y * y - 1;

putchar(a * a * a - x * x * y * y * y <= 0.0f ? ‘*‘ : ‘ ‘);

}

putchar(‘\n‘);

}

}

*********************************************************************************************

#include

int main() {

for (float y = 1.5f; y > -1.5f; y -= 0.1f) {

for (float x = -1.5f; x < 1.5f; x += 0.05f) {

float z = x * x + y * y - 1;

float f = z * z * z - x * x * y * y * y;

putchar(f <= 0.0f ? ".:-=+*#%@"[(int)(f * -8.0f)] : ‘ ‘);

}

putchar(‘\n‘);

}

}

*********************************************************************************************

#include

#include

float f(float x, float y, float z) {

float 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) {

for (float y = 1.0f; y >= 0.0f; y -= 0.001f)

if (f(x, y, z) <= 0.0f)

return y;

return 0.0f;

}

int main() {

for (float z = 1.5f; z > -1.5f; z -= 0.05f) {

for (float x = -1.5f; x < 1.5f; x += 0.025f) {

float v = f(x, 0.0f, z);

if (v <= 0.0f) {

float y0 = h(x, z);

float ny = 0.01f;

float nx = h(x + ny, z) - y0;

float nz = h(x, z + ny) - y0;

float nd = 1.0f / sqrtf(nx * nx + ny * ny + nz * nz);

float d = (nx + ny - nz) * nd * 0.5f + 0.5f;

putchar(".:-=+*#%@"[(int)(d * 5.0f)]);

}

else

putchar(‘ ‘);

}

putchar(‘\n‘);

}

}

*********************************************************************************************

#ifdef _MSC_VER

#define _CRT_SECURE_NO_WARNINGS

#endif

#include

#include

float f(float x, float y, float z) {

float 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) {

for (float y = 1.0f; y >= 0.0f; y -= 0.001f)

if (f(x, y, z) <= 0.0f)

return y;

return 0.0f;

}

int main() {

FILE* fp = fopen("heart.ppm", "w");

int sw = 512, sh = 512;

fprintf(fp, "P3\n%d %d\n255\n", sw, sh);

for (int sy = 0; sy < sh; sy++) {

float z = 1.5f - sy * 3.0f / sh;

for (int sx = 0; sx < sw; sx++) {

float x = sx * 3.0f / sw - 1.5f;

float v = f(x, 0.0f, z);

int r = 0;

if (v <= 0.0f) {

float y0 = h(x, z);

float ny = 0.001f;

float nx = h(x + ny, z) - y0;

float nz = h(x, z + ny) - y0;

float nd = 1.0f / sqrtf(nx * nx + ny * ny + nz * nz);

float d = (nx + ny - nz) / sqrtf(3) * nd * 0.5f + 0.5f;

r = (int)(d * 255.0f);

}

fprintf(fp, "%d 0 0 ", r);

}

fputc(‘\n‘, fp);

}

fclose(fp);

}

*********************************************************************************************

#include

#include

#include

#include

float f(float x, float y, float z) {

float 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) {

for (float y = 1.0f; y >= 0.0f; y -= 0.001f)

if (f(x, y, z) <= 0.0f)

return y;

return 0.0f;

}

int main() {

HANDLE o = GetStdHandle(STD_OUTPUT_HANDLE);

_TCHAR buffer[25][80] = { _T(‘ ‘) };

_TCHAR ramp[] = _T(".:-=+*#%@");

for (float t = 0.0f;; t += 0.1f) {

int sy = 0;

float s = sinf(t);

float a = s * s * s * s * 0.2f;

for (float z = 1.3f; z > -1.2f; z -= 0.1f) {

_TCHAR* p = &buffer[sy++][0];

float tz = z * (1.2f - a);

for (float x = -1.5f; x < 1.5f; x += 0.05f) {

float tx = x * (1.2f + a);

float v = f(tx, 0.0f, tz);

if (v <= 0.0f) {

float y0 = h(tx, tz);

float ny = 0.01f;

float nx = h(tx + ny, tz) - y0;

float nz = h(tx, tz + ny) - y0;

float nd = 1.0f / sqrtf(nx * nx + ny * ny + nz * nz);

float d = (nx + ny - nz) * nd * 0.5f + 0.5f;

*p++ = ramp[(int)(d * 5.0f)];

}

else

*p++ = ‘ ‘;

}

}

for (sy = 0; sy < 25; sy++) {

COORD coord = { 0, sy };

SetConsoleCursorPosition(o, coord);

WriteConsole(o, buffer[sy], 79, NULL, 0);

}

Sleep(33);

}

}