ObjectFollower.c

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class ObjectFollower extends ScriptedWidgetEventHandler
{
  reference int m_PivotYOffset;
 
  protected Widget m_Root;
  protected Object m_TargetObject;
  protected bool m_Visible;
 
  void ObjectFollower()
  {
    m_Visible = false;
    //GetGame().GetUpdateQueue(CALL_CATEGORY_GUI).Insert(Update);
  }
 
  void ~ObjectFollower()
  {
    //GetGame().GetUpdateQueue(CALL_CATEGORY_GUI).Remove(Update);
  }
 
  protected void OnWidgetScriptInit(Widget w)
  {
    m_Root = w;
    m_Root.SetHandler(this);
  }
 
  void SetTarget(Object obj)
  {
    m_TargetObject = obj;
  }
 
  override bool OnUpdate(Widget w)
  {
    if (m_Root == w)
    {
      Update();
      return true;
    }
 
    return false;
  }
 
  void Update()
  {
    float x, y;
 
    if (m_Visible)
    {
      if (m_TargetObject)
        GetOnScreenPosition(x, y);
 
      m_Root.Show(true);
    }
    else
      m_Root.Show(false);
  }
 
  protected void GetOnScreenPosition(out float x, out float y)
  {
    const float DEFAULT_HANDLE_OFFSET = 0.2;
 
    float pivotYOffset = 0.0;
 
    bool ignorePivot = false;
    bool traceMatched = false;
    bool isDefaultPos = false;
 
    vector objectPos;
 
    if (m_TargetObject)
    {
      pivotYOffset = m_PivotYOffset;
 
      traceMatched = true;
      objectPos = m_TargetObject.GetPosition();
      if (pivotYOffset != 0.0)
        objectPos[1] = objectPos[1] + pivotYOffset;
      else
        objectPos[1] = objectPos[1] + DEFAULT_HANDLE_OFFSET;
    }
    else
    {
      // default position for the action cursor
      traceMatched = false;
      isDefaultPos = true;
    }
 
    if (ignorePivot && !traceMatched)
    {
      // hides the widget if we are in situation that the widget will be displayed on pivot point
      // and we do not want to display it
      x = 0.0;
      y = 0.0;
    }
    else
    {
      // calculate screen position from traced results
      if (isDefaultPos)
      {
        int w, h;
        GetScreenSize(w, h);
        x = w / 2;
        y = h / 2;
      }
      else
      {
        vector screen_pos = GetGame().GetScreenPos(objectPos);
        x = screen_pos[0];
        y = screen_pos[1];
      }
    }
 
    objectPos = "0 0 0";
    isDefaultPos = false;
  }
}