nth loop logo processing sketch

nthloop.logo.pde.java

color[] colors = { color(85, 98, 112), color(78, 205, 196), 
                   color(199, 244, 100), color(255, 107, 107),
                   color(196, 77, 88)
                 };
float rot = 0;
int colorIndex = 0;

void setup() {
  frameRate(26);
  size(325, 200, P3D);
}

void draw() {
  noStroke();
  background(255);

  // Set up 3 light sources
  directionalLight(50, 50, 50, 0, -50, -50);
  directionalLight(50, 50, 50, 50, 50, -50);
  ambientLight(155, 155, 155);

  translate(50, 105, -50);
  rotateY(PI/4);
  rotateZ(PI/2);
  rotateX(PI/4);

  // animate by rotating across the z-axis
  rot += 0.05;
  if (rot >= TWO_PI) {
    rot = 0;
  }
  rotateZ(-rot);

  // Start drawing the shape
  beginShape(QUAD_STRIP);

  // Set up variables for the helix
  //   x = r.cos(t), y = r.sin(t), z = c.t
  // To get a fan-fold, make two helixes of different sizes and 
  // draw shapes from one to the next.
  float c = 75, r = 100, r2 = 150, maxT = 3.2, t, t2;
  float x, y, z, factor = 5, i, diff = 10;

  colorIndex = 0;

  for (i = 0; i < maxT * factor; i++) {
    
    t = i / factor;
    t2 = (i + 1) / factor;

    fill(colors[(int) colorIndex / 2]);

    x = r * cos(t);
    y = -r * sin(t);
    z = c * t;
    vertex(x, y, z);

    x = -r * cos(t2);
    y = +r * sin(t2);
    z = c * t;
    vertex(x, y, z);

    x = r * cos(t);
    y = -r * sin(t);
    z = c * t + diff;
    vertex(x, y, z);

    x = -r * cos(t2);
    y = +r * sin(t2);
    z = c * t + diff;
    vertex(x, y, z);

    colorIndex++;
    colorIndex = colorIndex % 10;
  }

  endShape();
  fill(0);
}