画圣诞树- #include <stdio.h>
- #include <math.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;
- 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 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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