float r = 241;
float g = 94;
float b = 102;

void setup () {
 size (400,380);
 background(0);
}


void draw () {
 frameRate(17);
 strokeWeight(10);
 for (int i=-6; i<400; i=i+40) {
   line (0,i,400,i);
   stroke(0);
 }
 for (int a=mouseX; a<440; a=a+40) {
   line (a-40,0,a-40,400);
   stroke(a,r,g,b);
 }

}

void keyPressed () {
 r = random (255);
 g = random (255);
 b = random (255);

}

void mousePressed() {
 saveFrame();
 println("save a picture");
}