ProcessingでGenerative art #56

Code

Particle[] particles = new Particle[4000];
int particlesCount = 4000;
float noiseScale = 800, noiseStrength = 30;
float pAlpha = 30, strokeWidth = 0.3;
int drawMode = 1;

void setup() {
  size(800, 800);
  pixelDensity(2);
  background(255);

  for (int i=0; i<particles.length; i++) {
    particles[i] = new Particle();
  }
}

void draw() {
  for (int i=0; i<particlesCount; i++) {
    particles[i].run();
  }
}

void keyPressed() {
  if (key == BACKSPACE)background(255);
  if (key == ' ') {
    int newNoiseSeed = (int)random(10000);
    noiseSeed(newNoiseSeed);
  }
}

//-----------------------------------------------------------------

class Particle {
  PVector pos, posOld;
  float stepSize, angle;
  boolean isOutside = false;

  Particle() {
    pos = new PVector(random(width), random(height));
    posOld = new PVector(pos.x, pos.y);
    stepSize = random(1, 5);
  }

  void update() {
    angle = noise(pos.x/noiseScale, pos.y/noiseScale) * noiseStrength;
    pos.x += cos(angle) * stepSize;
    pos.y += sin(angle) * stepSize;

    if (pos.x<-10) isOutside = true;
    else if (pos.x>width+10)isOutside = true;
    else if (pos.y<-10)isOutside = true;
    else if (pos.y>height+10)isOutside = true;

    if (isOutside) {
      pos.x = random(width);
      pos.y = random(height);
      posOld.set(pos);
    }
  }

  void draw() {
    float col  = map(angle, 0, noiseStrength, 0, 255);
    stroke(102, 98, col, pAlpha);
    strokeWeight(strokeWidth * stepSize);
    line(posOld.x, posOld.y, pos.x, pos.y);
    posOld.set(pos);
    isOutside = false;
  }

  void run() {
    update();
    draw();
  }
}

Happy coding!