FRACTALE DE SIERPINSKI

#include "triangle.h"
void dessin(struct triangle* arbre,SDL_Surface* fenetre,SDL_Surface* px){
	int i;
	SDL_Rect pos;
	if(arbre->a!=NULL){
		dessin(arbre->a,fenetre,px);
		dessin(arbre->b,fenetre,px);
		dessin(arbre->c,fenetre,px);
	}
	else
		for(i=0; i<3; i++){
			pos=(SDL_Rect){arbre->point[i].x,arbre->point[i].y};
			SDL_BlitSurface(px,NULL,fenetre,&pos);
		}
	return;
}
void ramifier(struct triangle* fractale){
	struct coord* p=fractale->point;
	if(fractale->a!=NULL){
		ramifier(fractale->a);
		ramifier(fractale->b);
		ramifier(fractale->c);
	}
	else{
		fractale->a=(struct triangle*)malloc(sizeof(struct triangle));
		*fractale->a=(struct triangle){{{p[0].x,p[0].y},
		{(p[0].x+p[1].x)/2,(p[0].y+p[1].y)/2},
		{(p[0].x+p[2].x)/2,(p[0].y+p[2].y)/2}},NULL,NULL,NULL};
		fractale->b=(struct triangle*)malloc(sizeof(struct triangle));
		*fractale->b=(struct triangle){{{p[1].x,p[1].y},
		{(p[0].x+p[1].x)/2,(p[0].y+p[1].y)/2},
		{(p[1].x+p[2].x)/2,(p[1].y+p[2].y)/2}},NULL,NULL,NULL};
		fractale->c=(struct triangle*)malloc(sizeof(struct triangle));
		*fractale->c=(struct triangle){{{p[2].x,p[2].y},
		{(p[0].x+p[2].x)/2,(p[0].y+p[2].y)/2},
		{(p[1].x+p[2].x)/2,(p[1].y+p[2].y)/2}},NULL,NULL,NULL};
	}
	return;
}
void liberer(struct triangle* fractale){
	if(fractale->a!=NULL){
		liberer(fractale->a);
		liberer(fractale->b);
		liberer(fractale->c);
	}
	free(fractale);
	return;
}