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heart.c
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#include "io.inc"
char *symbol[] = {".", ":", "-", "=", "+", "*", "#", "%", "@"};
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;
}
float mysqrt(float x) {
if (x == 0) return 0;
int i;
double v = x / 2;
for (i = 0; i < 50; ++i)
v = (v + x / v)/2;
return v;
}
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 / mysqrt(nx * nx + ny * ny + nz * nz);
float d = (nx + ny - nz) * nd * 0.5f + 0.5f;
int index = (int)(d * 5.0f);
printStr(symbol[index]);
}
else {
printStr("_");
}
}
printStr("\n");
}
return judgeResult; // 127
}