"""
     qtgui/CircleTextures.py: CCP4MG Molecular Graphics Program
     Copyright (C) 2011 University of York
     Copyright (C) 2012 STFC

     This library is free software: you can redistribute it and/or
     modify it under the terms of the GNU Lesser General Public License
     version 3, modified in accordance with the provisions of the 
     license to address the requirements of UK law.
 
     You should have received a copy of the modified GNU Lesser General 
     Public License along with this library.  If not, copies may be 
     downloaded from http://www.ccp4.ac.uk/ccp4license.php
 
     This program 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.
"""
import sys
import os
from PyQt4 import QtCore, QtGui

def getTextureImage(width=2048,height=2048,line_width=50,circle_width=18,fontFamily="Helvetica",bold=True,italic=False,fontSize=0.5):
  theLineWidth = line_width
  theCircleWidth = circle_width
  required_width,required_height = width, height

  tex_f = open(os.path.join(os.environ["CCP4MG"],"shaders","textures","atom_texture_coords_table"))
  tex_atoms = {}
  for l in tex_f.readlines():
    tsx, tex,tsy,tey = l[2:].split()
    tex_atoms[l[:2]] = float(tsx), float(tex), float(tsy), float(tey)
  tex_f.close()
  
  image = QtGui.QImage(required_width,required_height,QtGui.QImage.Format_ARGB32);
  image.fill(0);
  
  circleWidth = int(theCircleWidth * required_width/2048.)
  
  painter = QtGui.QPainter()
  fn = QtGui.QFont(fontFamily)
  fn.setPixelSize(required_height/9*fontSize)
  fn.setBold(bold)
  fn.setItalic(italic)
  fm = QtGui.QFontMetrics(fn)
  painter.begin(image)
  painter.setFont(fn)
  painter.setRenderHints(QtGui.QPainter.Antialiasing|QtGui.QPainter.TextAntialiasing)
  
  brush = QtGui.QBrush(QtCore.Qt.white)
  painter.setBrush(brush);
  
  pen = QtGui.QPen(QtGui.QColor(0,0,0,255))
  pen.setWidth(circleWidth)
  painter.setPen(pen);
  
  for i in range(8):
    for j in range(7):
      x = i * required_width/8. + 16 + circleWidth/2
      y = j * required_height/8. + 16 + circleWidth/2
      painter.drawEllipse(x, y, required_width/8.-(32+ circleWidth), required_height/8.-(32+ circleWidth))
  
  for key,val in tex_atoms.items():
    t = key.strip()
    if t == "X": continue
    if len(t)>1:
      t = t.lower().capitalize()
    #r = fm.boundingRect(t)
    r = fm.tightBoundingRect(t)
    #x = (0.9375-val[0])*required_width + 0.5*(r.right()-r.left()) + r.left()
    #y = (1.0-val[2])*required_height - 0.0625*required_height + 0.5 * (r.height()) - fm.descent()
    x = (0.9375-val[0])*required_width+ 0.5*(r.width())+fm.leftBearing(QtCore.QChar(t[0]))
    y = (1.0-val[2])*required_height- 0.0625*required_height + 0.5 * (r.height()) - 1 - r.bottom()
    #if 'j' in t or 'g' in t or 'y' in t or 'p' in t or 'q' in t:
    #  y = y - fm.descent()
    transform = QtGui.QTransform(
    -1, 0, 0,
    0, 1, 0,
    0, 0, 1
    )
    painter.setTransform(transform)
    painter.drawText(-x,y,t)
    painter.resetTransform()
  
  painter.setPen(0)
  painter.drawRect(0.875*required_width,0.875*required_height,required_width,required_height)
  
  lineWidth = theLineWidth
  pen.setWidth(lineWidth)
  painter.setPen(pen)
  painter.setBrush(0);
  
  painter.drawLine(0.875*required_width+lineWidth/2.,0.875*required_height+lineWidth/2.,required_width,0.875*required_height+lineWidth/2.)
  painter.drawLine(0.875*required_width+lineWidth/2.,required_height-lineWidth/2.,required_width,required_height-lineWidth/2.)
  lineWidth = lineWidth*0.4
  pen.setWidth(lineWidth)
  painter.setPen(pen)
  painter.drawLine(0.875*required_width+lineWidth/2.,0.875*required_height+lineWidth/2.,0.875*required_width+lineWidth/2.,required_height-lineWidth/2.)
  
  pen = QtGui.QPen(QtGui.QColor(255,255,255,255))
  lineWidth = theLineWidth + 6
  pen.setWidth(lineWidth)
  painter.setPen(pen);
  
  painter.drawLine(0.75*required_width+lineWidth/2.,0.875*required_height+lineWidth/2.,0.875*required_width-lineWidth/2.,0.875*required_height+lineWidth/2.)
  painter.drawLine(0.75*required_width+lineWidth/2.,required_height-lineWidth/2.,0.875*required_width-lineWidth/2.,required_height-lineWidth/2.)
  lineWidth = lineWidth * 0.4
  pen.setWidth(lineWidth)
  painter.setPen(pen)
  painter.drawLine(0.75*required_width+lineWidth/2.,0.875*required_height+lineWidth/2.,0.75*required_width+lineWidth/2.,required_height-lineWidth/2.)
  
  circleWidth = int(theCircleWidth+2 * required_width/2048.)
  pen.setWidth(circleWidth)
  painter.setPen(pen);
  i = 0
  j = 7
  x = i * required_width/8. + 3 + circleWidth/2
  y = j * required_height/8. + 3 + circleWidth/2
  painter.drawEllipse(x, y, required_width/8.-(6+ circleWidth), required_height/8.-(6+ circleWidth))
  
  painter.end()
  
  mat = QtGui.QMatrix(-1,0,0,-1,0,0)
  image = image.transformed(mat,QtCore.Qt.SmoothTransformation)
  
  return image

if __name__ == "__main__":
  if "-quit" in sys.argv:
    sys.exit()

  app = QtGui.QApplication(sys.argv)
  fontFamily="Helvetica"
  if len(sys.argv)>1:
   fontFamily = sys.argv[1]

  image = getTextureImage(circle_width=32,fontSize=0.4,fontFamily=fontFamily)
  image.save("atexture.png")