C语言 圣诞树

这几天就是圣诞节了，给大家安排一个C语言的圣诞树 有点简陋 不喜勿喷。

#include 

#include 

#include 

#include 

#define PI 3.14159265359

#define T px + scale * r * cosf(theta), py + scale * r * sin(theta)

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;

}

float f(float px, float py, float theta, float scale, int n) {

    float d = 0.0f;

    for (float r = 0.0f; r < 0.8f; 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 ribbon() {

    float x = (fmodf(sy, 0.1f) / 0.1f - 0.5f) * 0.5f;

    return sx >= x - 0.05f && sx <= x + 0.05f;

}

int main(int argc, char* argv[]) {

    int n = argc > 1 ? atoi(argv[1]) : 3;

    float zoom = argc > 2 ? atof(argv[2]) : 1.0f;

    for (sy = 0.8f; sy > 0.0f; sy -= 0.02f / zoom, putchar('n'))

        for (sx = -0.35f; sx < 0.35f; sx += 0.01f / zoom) {

            if (f(0, 0, PI * 0.5f, 1.0f, n) < 0.0f) {

                if (sy < 0.1f) {

                    putchar('.');

                }
                else {

                    if (ribbon()) {

                        putchar('=');

                    }
                    else {

                        putchar("............................#j&o"[rand() % 32]);

                    }

                }

            }
            else {

                putchar(' ');

            }

        }

    Sleep(1000);

    printf("nnn");

    for (size_t i = 0; i < 40; i++) {

        putchar(' ');

    }

    //_sleep(5000);

    printf("Merry Christmas!n");

    Sleep(500);

    for (size_t i = 0; i < 40; i++) {

        putchar(' ');

    }

    printf("Happy everydayn");

    Sleep(500);

    for (size_t i = 0; i < 40; i++) {

        putchar(' ');

    }

    printf("2021/12/24,Mi roninn");

    getchar();

}