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 (float 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 ? '*' : ' ');
}
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C++圣诞树代码
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