////////////////////////////////////////////////////////////////////////////
//
//  Crytek Engine Source File.
//  Copyright (C), Crytek Studios, 2001-2004.
// -------------------------------------------------------------------------
//  File name:   LineGizmo.cpp
//  Version:     v1.00
//  Created:     6/11/2003 by Timur.
//  Compilers:   Visual Studio.NET 2003
//  Description: 
// -------------------------------------------------------------------------
//  History:
//
////////////////////////////////////////////////////////////////////////////

#include "StdAfx.h"
#include "LineGizmo.h"

#include "DisplayContext.h"

#include "..\Viewport.h"
#include "..\DisplaySettings.h"
#include "ObjectManager.h"

#include "GizmoManager.h"
#include "Settings.h"

//////////////////////////////////////////////////////////////////////////
CLineGizmo::CLineGizmo()
{
	m_color[0] = CFColor(0,1,1,1);
	m_color[1] = CFColor(0,1,1,1);
}

//////////////////////////////////////////////////////////////////////////
CLineGizmo::~CLineGizmo()
{
	if (m_object[0])
		m_object[0]->RemoveEventListener( functor(*this,&CLineGizmo::OnObjectEvent) );
	if (m_object[1])
		m_object[1]->RemoveEventListener( functor(*this,&CLineGizmo::OnObjectEvent) );
	m_object[0] = 0;
	m_object[1] = 0;
}

//////////////////////////////////////////////////////////////////////////
void CLineGizmo::SetObjects( CBaseObject *pObject1,CBaseObject *pObject2 )
{
	assert( pObject1 );
	assert( pObject2 );
	m_object[0] = pObject1;
	m_object[1] = pObject2;
	
	m_object[0]->AddEventListener( functor(*this,&CLineGizmo::OnObjectEvent) );
	m_object[1]->AddEventListener( functor(*this,&CLineGizmo::OnObjectEvent) );
	CalcBounds();
}

//////////////////////////////////////////////////////////////////////////
void CLineGizmo::OnObjectEvent( CBaseObject *object,int event )
{
	if (event == CBaseObject::ON_TRANSFORM)
	{
		// One of objects transformed, recalc gizmo bounds.
		CalcBounds();
		return;
	}
	if (event == CBaseObject::ON_DELETE)
	{
		// This gizmo must be deleted as well if one of the objects is deleted.
		GetGizmoManager()->RemoveGizmo(this);
		return;
	}
	if (event == CBaseObject::ON_VISIBILITY)
	{
		// Check visibility of gizmo.
		bool bVisible = m_object[0]->CheckFlags(OBJFLAG_VISIBLE) && m_object[1]->CheckFlags(OBJFLAG_VISIBLE);
		if (bVisible)
			SetFlags( GetFlags() & (~EGIZMO_HIDDEN));
		else
			SetFlags( GetFlags() | EGIZMO_HIDDEN );
		return;
	}
}

//////////////////////////////////////////////////////////////////////////
void CLineGizmo::Display( DisplayContext &dc )
{
	if (dc.flags & DISPLAY_LINKS)
	{
		if (m_object[0]->CheckFlags(OBJFLAG_PREFAB) && m_object[1]->CheckFlags(OBJFLAG_PREFAB))
			return;

		// Draw line between objects.
		dc.DrawLine( m_point[0],m_point[1],m_color[0],m_color[1] );

		if (!(dc.flags & DISPLAY_HIDENAMES))
		{
			Vec3 pos = 0.5f*(m_point[0] + m_point[1]);
			//dc.renderer->DrawLabelEx( p3+Vec3(0,0,0.3f),1.2f,col,true,true,m_name );

			float camDist = GetDistance(dc.camera->GetPos(), pos );
			float maxDist = dc.settings->GetLabelsDistance();
			if (camDist < dc.settings->GetLabelsDistance())
			{
				float range = maxDist / 2.0f;
				float col[4] = { m_color[0].r,m_color[0].g,m_color[0].b,m_color[0].a };
				if (camDist > range)
				{
					col[3] = col[3] * (1.0f - (camDist - range)/range);
				}
				dc.SetColor( col[0],col[1],col[2],col[3] );
				dc.DrawTextLabel( pos+Vec3(0,0,0.2f),1.2f,m_name );
			}
		}
	}
}

//////////////////////////////////////////////////////////////////////////
void CLineGizmo::CalcBounds()
{
	m_bbox.Reset();
	
	BBox box;
	m_object[0]->GetBoundBox( box );
	m_point[0] = 0.5f*Vec3(box.max+box.min);
	m_object[1]->GetBoundBox( box );
	m_point[1] = 0.5f*Vec3(box.max+box.min);

	m_bbox.Add( m_point[0] );
	m_bbox.Add( m_point[1] );
}

//////////////////////////////////////////////////////////////////////////
void CLineGizmo::GetWorldBounds( BBox &bbox )
{
	bbox = m_bbox;
}

//////////////////////////////////////////////////////////////////////////
void CLineGizmo::SetColor( const Vec3 &color1,const Vec3 &color2,float alpha1,float alpha2 )
{
	m_color[0] = CFColor(color1.x,color1.y,color1.z,alpha1);
	m_color[1] = CFColor(color2.x,color2.y,color2.z,alpha2);
}

//////////////////////////////////////////////////////////////////////////
void CLineGizmo::SetName( const char *sName )
{
	m_name = sName;
}

//////////////////////////////////////////////////////////////////////////
bool CLineGizmo::HitTest( HitContext &hc )
{
	return 0;
	/*
	if (hc.distanceTollerance != 0)
		return 0;

	Vec3 org = m_object->GetWorldPos();

	float fScreenScale = hc.view->GetScreenScaleFactor(org);
	float size = gSettings.gizmo.axisGizmoSize * fScreenScale;

	Vec3 x(size,0,0);
	Vec3 y(0,size,0);
	Vec3 z(0,0,size);

	float hitDist = 0.01f * fScreenScale;

	//////////////////////////////////////////////////////////////////////////
	// Calculate ray in local space of axis.
	//////////////////////////////////////////////////////////////////////////
	Matrix44 tm;
	RefCoordSys refCoordSys = GetIEditor()->GetReferenceCoordSys();
	if (refCoordSys == COORDS_LOCAL)
	{
		tm = m_object->GetWorldTM();
		tm.NoScale();
	}
	else
	{
		tm.SetIdentity();
		tm.SetTranslationOLD( m_object->GetWorldPos() );
	}
	tm.Invert44();
	Vec3 raySrc = tm.TransformPointOLD( hc.raySrc );
	//CHANGED_BY_IVO
	//Vec3 rayDir = tm.TransformVector( hc.rayDir );
	Vec3 rayDir = GetTransposed44(tm) * ( hc.rayDir );
	//////////////////////////////////////////////////////////////////////////

	Vec3 pnt;
	BBox box;
	box.min = - Vec3(hitDist*2,hitDist*2,hitDist*2);
	box.max = Vec3(size+hitDist*2,size+hitDist*2,size+hitDist*2);
	if (!box.IsIntersectRay( raySrc,rayDir,pnt ))
	{
		m_highlightAxis = 0;
		return false;
	}


	float axisdist[10];
	Vec3 np[10];

	Vec3 rayTrg = raySrc + rayDir*10000.0f;

	size *= 0.3f;
	Vec3 p1(size,size,0);
	Vec3 p2(size,0,size);
	Vec3 p3(0,size,size);

	axisdist[AXIS_X] = RayToLineDistance( raySrc,rayTrg,Vec3(0,0,0),x,np[AXIS_X] );
	axisdist[AXIS_Y] = RayToLineDistance( raySrc,rayTrg,Vec3(0,0,0),y,np[AXIS_Y] );
	axisdist[AXIS_Z] = RayToLineDistance( raySrc,rayTrg,Vec3(0,0,0),z,np[AXIS_Z] );
	axisdist[AXIS_XY] = RayToLineDistance( raySrc,rayTrg,p1,p1-x*0.3f,np[AXIS_XY] );
	axisdist[AXIS_XZ] = RayToLineDistance( raySrc,rayTrg,p2,p2-x*0.3f,np[AXIS_XZ] );
	axisdist[AXIS_YZ] = RayToLineDistance( raySrc,rayTrg,p3,p3-y*0.3f,np[AXIS_YZ] );

	float mindist = hitDist;
	int axis = 0;
	for (int i = AXIS_X; i <= AXIS_XZ; i++)
	{
		if (axisdist[i] < mindist)
		{
			mindist = axisdist[i];
			axis = i;
		}
	}

	if (axis != 0)
	{
		hc.axis = axis;
		hc.object = m_object;
		hc.dist = GetDistance(raySrc,np[axis]);
	}

	m_highlightAxis = axis;

	return axis != 0;
	*/
}