C++圣诞树代码
效果图

代码
#include<stdio.h>
#include<math.h>
#include<stdlib.h>
using namespace std;
#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;
for (float r = 0.0f; r < 0.8; r += 0.02f)
d = opUnion(d, sdCircle(T, 0.05f * scale * (0.95f - r)));
if (n>0)
for (int t = -1; t <= 1; t += 2)
{
float tt = theta + t * 1.8f;
float ss = scale * 0.9f;
for (fl