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;
 }
}