// multi agent with ring connection
// 041009
// ah

int agent_number = 10;
Agent[] agents;

float theta_unit; 
int r = 100;

int x0, y0;

void setup() {
	// initialize screen
	size (500, 500);
	background(255);
	
	// set global various
	theta_unit = TWO_PI / agent_number;
	x0 = 250;
	y0 = 250;
	
	// create agents
	agents = new Agent[agent_number];
	for (int i = 0; i < agent_number; i++) {
//		agents[i] = new Agent(theta_unit * i, int(random(10, 200)));
		agents[i] = new Agent(random(1) * TWO_PI, int(random(10, 200)));
	}
	
	for (int i = 0; i < agent_number; i++) {
		agents[i].setPreviousAgent(agents[previous(i)]);
		agents[i].setNextAgent(agents[next(i)]);
	}
	
	// set initial status
	agents[0].setStatus(true);
	agents[3].setStatus(true);
}

// main loop
void loop() {
	background(255);
	for (int i = 0; i < agent_number; i++) {
		agents[i].move();
		agents[i].drawBox();
		agents[i].drawConnection();
		agents[i].communicateWithPrevious();
	}
}

// global function
// get next number
int next(int current) {
	int num;
	if (current == (agent_number - 1)) {
		num = 0;
	} else {
		num = current + 1;
	}
	return num;
}

// get previous number
int previous(int current) {
	int num;
	if (current == 0) {
		num = agent_number - 1;
	} else {
		num = current - 1;
	}
	return num;
}

// class definition
class Agent {
	float theta;
	Agent previous_agent, next_agent;
	boolean status;
	int r;

	Agent(float theta, int r) {
		this.theta = theta;
		this.r = r;
		status = false;
	}

	void setPreviousAgent(Agent a) {
		previous_agent = a;
	}
	
	void setNextAgent(Agent a) {
		next_agent = a;
	}

	void setStatus(boolean s) {
		status = s;
	}
	
	boolean getStatus() {
		return status;
	}
	
	float getTheta() {
		return theta;
	}
	
	int getR() {
		return r;
	}
	
	void drawBox() {
		stroke(180, 150, 0);
		if (status == true) {
			fill(200, 0, 0);
		} else {
			fill(200, 200, 0);
		}
		rect (x0 + r * sin(theta), y0 + r * cos(theta) * -1, 10, 10);
	}
	
	// tell left agent my status
	void communicateWithPrevious() {
		if (getStatus()) {
			previous_agent.setStatus(true);
			setStatus(false);
//			println(theta);
		}
	}
	
	void drawConnection() {
		stroke(200);
		line(
			x0 + r * sin(theta) + 5, y0 + r * cos(theta) * -1 + 5, 
			x0 + previous_agent.getR() * sin(previous_agent.getTheta()) + 5, 
			y0 + previous_agent.getR() * cos(previous_agent.getTheta()) * -1 + 5);
	}

	void move() {
		r += int(random(-1, 1));
		theta += random(-.01, .01);
	}
}