ProcessingでGenerative art #71

Code

Particle[] particles = new Particle[300];

int actRandomSeed = 0;
float noiseScale = 800, noiseStrength = 30;
float pAlpha = 100, strokeWidth = 4;
int drawMode = 1;

void setup() {
  size(800, 800);
  pixelDensity(2);
  colorMode(HSB, 360, 100, 100, 100);
  background(360);

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

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

  if (mousePressed) {
    strokeWeight(4);
    stroke(0);
    ellipse(mouseX, mouseY, 150, 150);
  }
}

void keyPressed() {
  if (key == '1')drawMode = 1;
  if (key == '2')drawMode = 2;
  if (key == '3')drawMode = 3;
  if (key == '4')drawMode = 1;

  if (key == 's')saveFrame("####.png");

  if (key == BACKSPACE)background(360);

  if (key == ' ') {
    int newNoiseSeed = (int)random(10000);
    noiseSeed(newNoiseSeed);
  }
}

void mousePressed() {
  actRandomSeed = (int)random(10000);
}

//-----------------------------------------------------------------
class Particle {
  PVector pos, posOld;
  float stepSize, angle;
  boolean isOutside = false;
  color col;
  float t;
  float noiseZ;

  Particle() {
    pos = new PVector(width/2, height/2);
    posOld = new PVector(pos.x, pos.y);
    stepSize = random(1, 7);
    t = random(10);
    noiseZ = random(10);
  }

  void update() {
    angle = noise(pos.x/noiseScale, pos.y/noiseScale, noiseZ) * 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 = width/2;
      pos.y = height/2;
      posOld.set(pos);
    }
   noiseZ += 0.01;
   t += 0.05;
  }

  void draw() {
    changeDrawMode();
    stroke(col, pAlpha);
    fill(col);
    strokeWeight(map(sin(t), -1, 1,0 , strokeWidth));
    line(posOld.x, posOld.y, pos.x, pos.y);
    posOld.set(pos);
    isOutside = false;
  }

  void run() {
    update();
    draw();
  }
  
  void changeDrawMode(){
    if(drawMode == 1){
    if(random(1) > 0.66)col = color(5, 100, 100);
    else if(random(1) > 0.33) col = color(360);
    else col = color(0);
    }
    
    if(drawMode == 2){
      if(random(1) > 0.66)col = color(305, 59, 100);
    else if(random(1) > 0.33)col = color(120, 75, 59);
    else col = color(random(360));
    }
    
    if(drawMode == 3){
      if(random(1) > 0.8)col = color(210, 100, 100);
      else if(random(1) > 0.6)col = color(2, 100, 100);
      else if(random(1) > 0.4)col = color(30, 100, 100);
      else if(random(1) > 0.2)col = color(170, 100, 100);
      else col = color(310, 100, 80);
    }
  }
}

Happy coding!!