// Processing 3. PImage bg; float a, b = 500; void setup () { size (500,500); bg = loadImage("PD3F.jpg"); } void draw() { background (bg); strokeWeight (10); stroke (125,255,51); line (a, 0, a, height); stroke (11,235,242); line (b, 0, b, height); stroke (255,0,0); line (0, a, width, a); stroke (0,0,0); line (0, b, width, b); a = a + 5; b = b - 5; if (a > 500) { a = 0; } if (b < 0) { b = 500; } } // Fernando Vázquez López 2ºJ en Alcalá de Henares a 26/02/2019. // Fondo con barrido vertical.