int casti = 400;
int vypln = 0; 
 
void setup(){
	size(500,500);
}
 
void draw(){  
	for(int i=1; i<=casti; i++){
		fill(vypln);
		noStroke();
		arc(250,250,400/casti*i, 400/casti*i, PI*2*i/casti, PI*2*i/casti+PI*2/casti); 
	}
}

void mouseClicked(){
	if(mouseButton == LEFT){
		vypln = 255;    
	}
	else{
		vypln = 0;
	}
}