int Attendre;
 
void setup() {
   size(500,500);
   background(255);
   Attendre = 0;
}

void draw() {  
   if (Attendre < 100) { Attendre = Attendre + 1;}
   else {if (mousePressed == true) {DessinerTrait();}}
   SauvegarderDessin();
}

void SauvegarderDessin() {
   if (keyPressed == true) {save("dessin.png");}
}

void DessinerTrait() {
   stroke(0,0,0,random(20,60)); line(mouseX,mouseY, random(0,500), random(0,500) );
}