圣诞树c语言实现源码.zip

#include <math.h> #include <stdio.h> #include <stdlib.h> #define PI 3.14159265359 float sx, sy; float sdCircle(float px, float py, float r) { float dx = px - sx, dy = py - sy; return sqrtf(dx * dx + dy * dy) - r; } float opUnion(float d1, float d2) { return d1 < d2 ? d1 : d2; } #define T px+scale*r*cosf(theta),py+scale*r*sin(theta) float f(float px, float py, float theta, float scale, int n) { float d = 0.0f; float r; int t; for (r = 0.0f; r < 0.8f; r += 0.02f) d = opUnion(d, sdCircle(T, 0.05f * scale * (0.95f - r))); if (n > 0) for (t = -1; t <= 1; t += 2) { float tt = theta + t * 1.8f; float ss = scale * 0.9f; for (r = 0.2f; r < 0.8f; r += 0.1f) { d = opUnion(d, f(T, tt, ss * 0.5f, n - 1)); ss *= 0.8f; } } return d; } int main(int argc, char* argv[]) { int n = argc > 1 ? atoi(argv[1]) : 3; for (sy = 0.8f; sy > 0.0f; sy -= 0.02f, putchar('\n')) for (sx = -0.35f; sx < 0.35f; sx += 0.01f) putchar(f(0, 0, PI * 0.5f, 1.0f, n) < 0 ? '*' : ' '); }