Forslag til løsning av oppgave 9

• let ax, ay, bx, by;
• let pencil_x, pencil_y; _{// Pennens koordinater}
• let angleA, angleB;
• let speedA, speedB;
• let track = []; _{// Tabell}
• let AoverB; _{// Hastigheten til A i forhold til B}
• let speedAdjust; 
• let v; _{// Vektor med pennens koordinater}
• function setup() {
  • createCanvas(400, 400);
  • noFill();
  • angleA = 0.0;
  • angleB = 0.0;
  • _{// Endre teller og nevner for å få andre mønstre}
  • AoverB = 4 / 3; 
  • _{// Hastigheten må nedjusteres}
  • speedAdjust = 0.05;
  • speedA = AoverB * speedAdjust;
  • speedB = 1 * speedAdjust;
• }
• function draw() {
  • background(220);
  • strokeWeight(1);
  • ellipse(100, 100, 100);
  • ellipse(300, 300, 100);
  • ax = 100 + cos(angleA) * 50;
  • ay = 100 + sin(angleA) * 50;
  • bx = 300 + cos(angleB) * 50;
  • by = 300 + sin(angleB) * 50;
  • pencil_x = bx;
  • pencil_y = ay;
  • strokeWeight(1);
  • line(ax, ay, pencil_x, pencil_y); _{// Vannrett}
  • line(bx, by, pencil_x, pencil_y); _{// Loddrett}
  • v = createVector(pencil_x, pencil_y);
  • track.push(v); _{// Legg til v sist i tabellen}
  • if (track.length > 800) {
    • track.splice(0, 1); _{// Tar bort 1 celle fra og med celle [0]}
  • }
  • for (i = 0; i < track.length; i++) {
    • strokeWeight(1);
    • point(track[i].x, track[i].y);
  • }
  • strokeWeight(4);
  • point(ax, ay);
  • point(bx, by);
  • point(pencil_x, pencil_y);
  • angleA = angleA + speedA;
  • angleB = angleB + speedB;
• }