int num=24; // number of cells

MonoCell[] m = new MonoCell[num];
MonoCell queen = new MonoCell();

void setup()
{
size(500,250);
ellipseMode(CENTER_DIAMETER);
background(20,20,20);

// cells constructor
for(int i=0; i<num; i++) {
m[i] = new MonoCell();
}
// queen = new MonoCell (100, 100, 50, 2, 5, 1, 80, 200, 15);
}

void loop() {
for(int i=0; i<num; i++) {
m[i].Live();
if ((i+1)<num) {
stroke(60);
line (m[i].posx,m[i].posy,m[i+1].posx,m[i+1].posy);
}
else {
line (m[i].posx,m[i].posy,m[0].posx,m[0].posy);
}
}
//queen.Live();

}

class MonoCell
{
float direc; // direction
float posx; // x position
float posy; // y position
float d; // direction
float diameter; // diameter
float shrink; // shrink|stretch factor
float step; // length of step
float dcell; // current diameter
float speed; // speed
float cellhue; // fillcolor
float borderhue;// bordercolor
float erraticness; // factor of shrink/change of direction

MonoCell () // default constructor
{
direc=0;
posx=100;
posy=100;
d=0;
diameter=random(3,35);
shrink=random(10);
step=random(10);
dcell=0;
speed=random(0);
cellhue= random(5,10)*15;
borderhue = random(5,10)*10;
erraticness= random(10,25);
}

MonoCell (float x, float y, float diam, float sh, float st, float sp, float chue, float border, float e) // constructor with parameters
{
direc=0;
posx=x;
posy=y;
d=0;
diameter=diam;
shrink=sh;
step=st;
dcell=0;
speed=sp;
cellhue= chue;
borderhue = border;
erraticness= e;
}

void Live (){

if (FeelsThatWay()) { // if feels so, change color and shrink or stretch cell..
stroke (borderhue,borderhue,borderhue);
fill(cellhue+200,160,120,75);
dcell=diameter+shrink;
}
else { // else draw with normal color and size
stroke (borderhue,borderhue,borderhue);
fill(cellhue+50,160,120,75);
dcell=diameter;
}

//if feels so, change direction
if (FeelsThatWay()) {
d=int(random(8));
}

// move
if (d==0) {posx+=step;} // E
else if (d==1) {posx-=step;} // W
else if (d==2) {posy+=step;} // S
else if (d==3) {posy-=step;} // N
else if (d==4) {posx+=step;posy-=step;} // NE
else if (d==5) {posx-=step;posy-=step;} // NW
else if (d==6) {posy+=step;posx+=step;} // SE
else if (d==7) {posy+=step;posx-=step;} // SW

// if pressed, cells follow the mouse (searching for food?)
if (mousePressed) {
if (posx<mouseX) {posx+=step;}
else if (posx>mouseX) {posx-=step;}
else if (posy<mouseY) {posy-=step;}
else if (posy>mouseY) {posy+=step;}
}
else {
// if not, cells avoid the mouse pointer
if (posx>=mouseX) {posx+=step/1.5;}
else if (posx<=mouseX) {posx-=step/1.5;}
else if (posy>=mouseY) {posy+=step/1.5;}
else if (posy<=mouseY) {posy-=step/1.5;}
}

// constrain movements to the edge of screen
if (posx<10) {posx=10;}
if (posy<10) {posy=10;}
if (posx>width-10) {posx=width-10;}
if (posy>height-10) {posy=height-10;}

//draw ellipse
ellipse(posx, posy, dcell, dcell);
// if diameter>25 pixels then put a nucleus
if (diameter>20) {
stroke (borderhue-50);
ellipse(posx, posy, dcell-7,dcell-7);
}

// wait some -random- amount of milliseconds
delay(int(speed));
}

boolean FeelsThatWay() // returns true randomly using erractiness as parameter
{
if (int(random(erraticness))==5) {
return true;
}
else return false;
}