Xmin = -100
Xmax = 100
Ymin = -100
Ymax = 100
couleur = "rgb(220,220,220)"
trait = 0.01
couleur = noir
peinture = "rgba(255,255,255,0.5)"
transparence = 1
x = 0
y = 0
rectangle([x,y],1,1)
x = 1
peinture = "rgba(200,0,0,0.5)"
transparence = 1
rectangle([x,y],1,1)
transparence = 0
sensx = 0
sensy = 1

nombre = 2

for(i = 1 ; i < 400; i++){
	
    for(j = 0; j <= Math.floor(i/2) ; j++){
    	nombre = nombre+1
        transparence = 0
	    if( isPrime(nombre) ){
        	peinture = "rgba(200,0,0,0.5)";
        	transparence = 1
        }
        x = x+sensx
        y = y+sensy
        rectangle([x,y],1,1)
    }
    asensx = sensx
    asensy = sensy
    if( asensx == -1 ){ sensx = 0; sensy = -1 }
    if( asensx == 1 ){ sensx = 0; sensy = 1 }
    if( asensy == 1 ){ sensy = 0; sensx = -1 }
    if( asensy == -1 ){ sensy = 0; sensx = 1 }
}

function isPrime(n){
	rep = true;
    for(var k = 2; k < Math.sqrt(n); k++){
    	if(n%k == 0){
        	rep = false;
            break;
        }
    }
    return rep
}

xxxxxxxxxx
 
Xmin = -100
Xmax = 100
Ymin = -100
Ymax = 100
couleur = "rgb(220,220,220)"
trait = 0.01
couleur = noir
peinture = "rgba(255,255,255,0.5)"
transparence = 1
x = 0
y = 0
rectangle([x,y],1,1)
x = 1
peinture = "rgba(200,0,0,0.5)"
transparence = 1
rectangle([x,y],1,1)
transparence = 0
sensx = 0
sensy = 1
​
nombre = 2
​