Perlin Noise

// ===================OBJECT   

class Circle { 

  PVector pos;  //position

  float stepSizeX;

  float stepSizeY;

  //float[] colorRGB = new float[3];    //float array stored colour info

//==================== Constructor, initialize the variables  

  Circle(){

    // create new vector storing information about position, moving direction & speed and colour

    pos = new PVector(random(width),random(height));    // assign x,y

    stepSizeX = pow(-1,round(random(1,2))) * random(stepSizeMin,stepSizeMax); //random number +/- stepSizeMin-Max

    stepSizeY = pow(-1,round(random(1,2))) * random(stepSizeMin,stepSizeMax); //random number +/- stepSizeMin-Max

    //for (int i = 0; i < 3; i++) {

    //  colorRGB[i] = round(random(0,255));    //generate color RGB value

    //}

  }

//==================== Methods and Functions   

​

void run(){

  update();

  display();

}

  //update the location of circle, moving according to the angle cotrolled by the perlin noise

  void update() {

    float angle = noise(pos.x/noiseScale,pos.y/noiseScale) * noiseStrength;

    pos.x += cos(angle) * stepSizeX;

    pos.y += sin(angle) * stepSizeY;

    // reverse direction if touching boundaries

    if (pos.x < 0 || pos.x > width) stepSizeX *= -1;  

    if (pos.y < 0 || pos.y > height) stepSizeY *= -1;

  }

  // draw circles

  void display (){ 

     //stroke(colorRGB[0],colorRGB[1],colorRGB[2],50);

     stroke(150,50);

     point(pos.x, pos.y);

  }

}

​