Hi everybody,
I'm traying to make a tree structure where every node can be dragged anywhere. I'm having a problem about the dragging part. First of all if I keep the mouse pressed anywhere and I move it over a node it will drag it wherever I put the mouse, but I want that to happen only if the mouse is first pressed over the node. Becuase of this, if I'm already dragging a node and the mouse pass over another node then I'll be dragging two nodes, or three, and so on. I thought about using a global boolean var but it doesn't seem to work..here a piece of code...

void mouseDragged(){
  if(locked){
    dragging=true;
  }
}

void mouseReleased(){
  dragging=false;
}

void draw(){
    background(0,0,0);
    //displaying the root node outsied the for loop so that dragging
    //will not affect this node
    nodes[0].display();
    for (int i = 1; i < numNodes; i++) {
      nodes[i].checkPos();
      nodes[i].display();
      if( dist(nodes[i].xpos, nodes[i].ypos, mouseX, mouseY) < nodes[i].radius){
        if( !locked){
          locked =true;
          if(dragging){
            nodes[i].c = color(90,90,90);
            nodes[i].xpos = mouseX;
            nodes[i].ypos = mouseY;
          }
        }else{
          nodes[i].c=color(255,255,255);
          locked=false;
        }
      }
    };
}

Maybe this code won't make any sense to somebody but it's just one of the solutions I tried...too many if condition =D

PS = I didn't report the setup part and the class Node