//////////////////////////////////////////////////////////////////////////////
// Name:        SVGFitToViewBox.cpp
// Purpose:     
// Author:      Alex Thuering
// Created:     2006/01/07
// RCS-ID:      $Id: SVGFitToViewBox.cpp,v 1.1 2006/01/08 12:26:03 ntalex Exp $
// Copyright:   (c) 2006 Alex Thuering
// Licence:     wxWindows licence
//////////////////////////////////////////////////////////////////////////////

#include "SVGFitToViewBox.h"

void wxSVGFitToViewBox::UpdateMatrix(wxSVGMatrix& matrix,
  const wxSVGLength& width, const wxSVGLength& height)
{
  // view box
  wxSVGRect viewbox = GetViewBox().GetAnimVal();
  if (viewbox.GetWidth()<=0 || viewbox.GetHeight()<=0) // FIX IsEmpty
    return;
  wxSVG_PRESERVEASPECTRATIO align =
    GetPreserveAspectRatio().GetAnimVal().GetAlign();
  if (align == wxSVG_PRESERVEASPECTRATIO_UNKNOWN)
    align = wxSVG_PRESERVEASPECTRATIO_XMIDYMID;
  if (align == wxSVG_PRESERVEASPECTRATIO_NONE)
  {
    matrix = matrix.ScaleNonUniform(
      width/viewbox.GetWidth(), height/viewbox.GetHeight());
  }
  else
  {
    double scale = 1;
    scale = width/viewbox.GetWidth();
    if (scale>height/viewbox.GetHeight())
      scale = height/viewbox.GetHeight();
    
    double x = 0;
    if (align == wxSVG_PRESERVEASPECTRATIO_XMIDYMIN ||
        align == wxSVG_PRESERVEASPECTRATIO_XMIDYMID ||
        align == wxSVG_PRESERVEASPECTRATIO_XMIDYMAX)
      x = (width - viewbox.GetWidth()*scale)/2;
    else if (align == wxSVG_PRESERVEASPECTRATIO_XMAXYMIN ||
             align == wxSVG_PRESERVEASPECTRATIO_XMAXYMID ||
             align == wxSVG_PRESERVEASPECTRATIO_XMAXYMAX)
      x = width - viewbox.GetWidth()*scale;
      
    double y = 0;
    if (align == wxSVG_PRESERVEASPECTRATIO_XMINYMID ||
        align == wxSVG_PRESERVEASPECTRATIO_XMIDYMID ||
        align == wxSVG_PRESERVEASPECTRATIO_XMAXYMID)
      y = (height - viewbox.GetHeight()*scale)/2;
    else if (align == wxSVG_PRESERVEASPECTRATIO_XMINYMAX ||
             align == wxSVG_PRESERVEASPECTRATIO_XMIDYMAX ||
             align == wxSVG_PRESERVEASPECTRATIO_XMAXYMAX)
      y = height - viewbox.GetHeight()*scale;
    
    if (x !=0 || y !=0)
      matrix = matrix.Translate(x, y);
    
    matrix = matrix.Scale(scale);
    if (viewbox.GetX() !=0 || viewbox.GetY() !=0)
      matrix = matrix.Translate(-viewbox.GetX(), -viewbox.GetY());
  }
}