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;
        //g_Game.GetUpdateQueue(CALL_CATEGORY_GUI).Insert(Update);
    }
    
    void ~ObjectFollower()
    {
        //g_Game.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 = g_Game.GetScreenPos( objectPos );
                x = screen_pos[0];
                y = screen_pos[1];
            }
        }
        
        objectPos = "0 0 0";
        isDefaultPos = false;
    }
}