Node.pde

class Node {
  int number;
  float inputSum = 0;
  ArrayList<ConnectionGene> outputConnections = new ArrayList<ConnectionGene>();
  float outputValue = 0;
  int layer = 0;
  PVector drawPos = new PVector();

  Node(int no) {
    number = no;
  }

  void engage() {
    if (layer!=0) {
      outputValue = sigmoid(inputSum);
    }
    for (int i = 0; i < outputConnections.size(); i++) {
      if (outputConnections.get(i).enabled) {
        outputConnections.get(i).toNode.inputSum += outputConnections.get(i).weight * outputValue;
      }
    }
  }

  float sigmoid (float x) {
    return 1 / (1 + pow((float)Math.E, -4.9*x));
  }

  boolean isConnectedTo(Node node) {
    if (node.layer == layer)return false;

    if (node.layer < layer) {
      for (int i = 0; i < node.outputConnections.size(); i++) {
        if (node.outputConnections.get(i).toNode == this) {
          return true;
        }
      }
    } else {
      for (int i = 0; i < outputConnections.size(); i++) {
        if (outputConnections.get(i).toNode == node) {
          return true;
        }
      }
    }
    return false;
  }

  Node clone() {
    Node clone = new Node(number);
    clone.layer = layer;
    return clone;
  }
}