immutable_gradient_info_handler.py

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#------------------------------------------------------------------------------
# This file is part of the OpenStructure project <www.openstructure.org>
#
# Copyright (C) 2008-2011 by the OpenStructure authors
#
# This library is free software; you can redistribute it and/or modify it under
# the terms of the GNU Lesser General Public License as published by the Free
# Software Foundation; either version 3.0 of the License, or (at your option)
# any later version.
# This library is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
# details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with this library; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
#------------------------------------------------------------------------------
# -*- coding: utf-8 -*-

from ost import gui
from ost import gfx
from ost import info
from PyQt4 import QtCore, QtGui

#Gradient Editor
class ImmutableGradientInfoHandler:
  def __init__(self, fileName):
    
    self.FILE_NAME = fileName    
    self.GRADIENTS_GROUP_NAME = "Gradients"
    self.GRADIENT_GROUP_NAME = "Gradient"
    self.NAME_ATTRIBUTE_NAME = "Name"
    
    self.handle_ = info.LoadOrCreateInfo(self.FILE_NAME)
        
    self.root_ = self.handle_.Root()
    
    self.gradients_ = self.root_.RetrieveGroup(self.GRADIENTS_GROUP_NAME)

    
  def GetGfxGradient(self, name):
    group = self.gradients_.GetGroup(name)
    gfx_gradient = gfx.Gradient.GradientFromInfo(group)
    return gfx_gradient
  
  def GetQGradient(self, name):
    gfx_gradient = self.GetGfxGradient(name)
    return ImmutableGradientInfoHandler.ConvertToQGradient(gfx_gradient)
    
  def GetQGradients(self):
    group_list = self.gradients_.GetGroups(self.GRADIENT_GROUP_NAME)
    q_gradients = dict()
    
    for group in group_list:
      if group.HasAttribute(self.NAME_ATTRIBUTE_NAME):
        gfx_gradient = gfx.Gradient.GradientFromInfo(group)
        q_gradients[group.GetAttribute(self.NAME_ATTRIBUTE_NAME)] = (ImmutableGradientInfoHandler.ConvertToQGradient(gfx_gradient))
      
    return q_gradients

  @staticmethod
  def ConvertToQGradient(gfx_gradient):
    stops = gfx_gradient.GetStops()
    qgrad = QtGui.QLinearGradient()
    for stop in stops:
      color = stop.GetColor()
      qcolor = QtGui.QColor(color.Red()*255,
                            color.Green()*255,
                            color.Blue()*255,
                            color.Alpha()*255)
      qgrad.setColorAt(stop.GetRel(), qcolor) 
    return qgrad 
  
  @staticmethod
  def ConvertToGfxGradient(gradient):  
    gfx_gradient = gfx.Gradient()    
    for s in gradient.stops():
      rel=s[0]
      color=s[1]
      gfx_gradient.SetColorAt(s[0], gfx.RGB(s[1].redF(), s[1].greenF(), s[1].blueF()));
    return gfx_gradient;