simple-ontology/nodes.pde

int nodeCount;
int i_selectedNode = -1;
int padding = textSize/3*2; //Padding between text and surrounding box
int letTolerance = 10; //Widens the clickable areas of in/outlets a bit 

void addNode(int x, int y, String title) {
  nodes[nodeCount] = new Node(x, y, title);
  nodeCount++;
}

void deselect() {
  i_selectedNode = -1;
}

void deleteSelectedNode() { //Seperate from class for garbage collector reasons
  if (i_selectedNode != -1) {
    for (int i = 0; i < linkCount; i++) {
      if (links[i].targetNode == i_selectedNode || links[i].parentNode == i_selectedNode) {
        links[i].active = false;
      }
    }
    nodes[i_selectedNode].deleted = true;
    i_selectedNode = -1;
  }
}

class Node {
  String title;
  int id;
  int inlets = 2;
  int outlets = 2;
  int x, y;
  int h = textSize+2*padding;
  int w = textSize+2*padding;
  PVector dragMouseStartPoint = new PVector(0, 0);
  PVector outletCenter = new PVector(0, 0);
  PVector inletCenter = new PVector(0, 0);
  boolean deleted;
  boolean drag;
  boolean hover() {
    if (mouseX > x-w/2 && mouseX < x+w/2 && mouseY > y-h/2 && mouseY < y+h/2) {
      return true;
    } else {
      return false;
    }
  }
  boolean hoverOutlet() {
    if (mouseX > x-(textSize+padding)/2-letTolerance && mouseX < x+(textSize+padding)/2+letTolerance && mouseY > y-padding-textSize/2-(textSize+padding)/2-letTolerance && mouseY < y-padding-textSize/2) {
      return true;
    } else {
      return false;
    }
  }
  boolean hoverInlet() {
    if (mouseX > x-(textSize+padding)/2-letTolerance && mouseX < x+(textSize+padding)/2+letTolerance && mouseY > y+padding+textSize/2 && mouseY < y+padding+textSize/2+(textSize+padding)/2+letTolerance) {
      return true;
    } else {
      return false;
    }
  }

  Node(int x_, int y_, String title_) {
    id = nodeCount;
    title = title_;
    x = x_;
    y = y_;
    setVectors();
    refreshSize();
  }

  void setVectors() {
    outletCenter.x = x;
    outletCenter.y = y-(padding+textSize/2)*1.3;
    inletCenter.x = x;
    inletCenter.y = y+(padding+textSize/2)*1.3;
  }

  /**
   * Called when changing nodes title or when zooming via mouse-wheel
   */
  void refreshSize() {
    w = int(textWidth(title))+2*padding;
    h = textSize+2*padding;
  }

  /**
   * Update-function is really only necessary when dragging the node
   */
  void update() {
    if (drag) {
      x -= dragMouseStartPoint.x - mouseX;
      dragMouseStartPoint.x = mouseX;
      y -= dragMouseStartPoint.y - mouseY;
      dragMouseStartPoint.y = mouseY;
      setVectors();
    }
  }

  void display() {
    /**
     * Selected nodes border
     */
    if (i_selectedNode == id) {
      noStroke();
      fill(150, 100);
      rect(x, y, w+20, h+20, 4);
    }

    /**
     * Inlet & Outlet
     */
    stroke(255, darkMode? 255 : 0);
    strokeWeight(1);
    fill(255, 0, 0);
    ellipse(x, y-padding-textSize/2, textSize+padding, textSize+padding);
    fill(0);
    ellipse(x, y+padding+textSize/2, textSize+padding, textSize+padding);

    /**
     * Box & Title
     */
    stroke(127);
    strokeWeight(2);
    fill(50);
    rect(x, y, w, h, 4);
    fill(255);
    text(title, x, y+textSize/3);
  }
}