diff options
| -rw-r--r-- | attract.c | 19 |
1 files changed, 10 insertions, 9 deletions
@@ -15,7 +15,7 @@ const int MAXITER=200; const double EPS=1e-1; -static double complex att_func(double complex x){ +static double complex att_func(double complex x,double exponent){ #if 0 static const int N=9; @@ -27,8 +27,7 @@ static double complex att_func(double complex x){ r+=y; return clog(r); #else - static const double N=8.5; - return clog((1-cpow(x,N+1))/(1-x)); + return clog((1-cpow(x,exponent+1))/(1-x)); #endif } @@ -49,8 +48,9 @@ static struct colour make_colour(int index){ } struct config{ - const double unitsz; - const int width,height; + double unitsz; + int width,height; + double exponent; }; struct thread_info{ @@ -86,7 +86,7 @@ static void* thread_entry(void *arg_vp){ (double)(iy-cfg.height/2)/cfg.unitsz); double complex z=start; for(int i=0;i<MAXITER;i++){ - z=att_func(z); + z=att_func(z,cfg.exponent); } if(do_basins){ int bi; @@ -121,8 +121,9 @@ static void* thread_entry(void *arg_vp){ int main(void){ struct config cfg={ - 200, - 500, 500 + .unitsz=200, + .width=500, .height=500, + .exponent=8.5 }; unsigned char img[cfg.width*cfg.height*3]; @@ -145,7 +146,7 @@ int main(void){ ths[i].yend=(i+1)*cfg.height/nthreads; ths[i].img=img; ths[i].do_basins=nthreads==1; - memcpy(&ths[i].cfg,&cfg,sizeof(struct config)); + ths[i].cfg=cfg; int ret=pthread_create(&ths[i].th,&attr,thread_entry,&ths[i]); if(ret!=0){ perror("pthread_create"); |