source: src/textures/Print.pxi @ 1154:a9b8a893a3f0

# PySoy's textures.Print class
#
# Copyright (C) 2006,2007,2008 PySoy Group
#
#  This program is free software; you can redistribute it and/or modify
#  it under the terms of the GNU Affero General Public License as published
#  by the Free Software Foundation, either version 3 of the License, or
#  (at your option) any later version.
#
#  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 Affero General Public License for more details.
#
#  You should have received a copy of the GNU Affero General Public License
#  along with this program; if not, see http://www.gnu.org/licenses
#
# $Id: Print.pxi 1200 2008-03-22 09:12:44Z ArcRiley $

cdef class Print (Texture) :
  '''PySoy textures.Print Class

    This renders text using cairo.
  '''

  ############################################################################
  #
  # Python functions
  #

  def __cinit__(self, text='', font='serif', 
                background=None, foreground=None,
                *args, **keywords) :
    self._formats[3] = gl.GL_BGR
    self._formats[4] = gl.GL_BGRA
    self._resize(1, 4, 512, 256, 1)
    #
    # Get a surface and context
    self._surface = cairo.cairo_image_surface_create_for_data (
      self._texels + (self._chans * self._width * (self._height-1)),
      cairo.CAIRO_FORMAT_ARGB32,
      self._width,
      self._height,
      self._width*self._chans*-1 )
    self._context = cairo.cairo_create(self._surface) 
    #
    # Set initial data (via properties)
    if background :
      self._background = background
    else :
      self._background = soy.colors.clear
    if foreground :
      self._foreground = foreground
    else :
      self._foreground = soy.colors.white
    self.text = text
    self.font = font


  ############################################################################
  #
  # Properties
  #

  property background :
    def __get__(self) :
      return self._background
    def __set__(self, soy.colors.Color value) :
      self._background = value
      self._draw()


  property foreground :
    def __get__(self) :
      return self._foreground
    def __set__(self, soy.colors.Color value) :
      self._foreground = value
      self._draw()
    
    
  property text :
    def __get__(self) :
      return self._text
    def __set__(self, value) :
      if type(value) == str :
        self._text = value
      else :
        raise TypeError('Text must be a string')
      self._draw()


  property font :
    def __get__(self) :
      return self._font
    def __set__(self, value) :
      if type(value) != str :
        raise TypeError('Text must be a string')
      self._font = value      
      self._draw()


  ############################################################################
  #
  # C functions
  #

  cdef void _draw(self) :
    #
    # _draw is called whenever the colors, font, or text is modified.
    # It uses Cairo to (re)draw the texture based on these parameters
    # to self._texels which the WindowLoop will then update the texture from.
    #
    cdef gl.GLfloat* _bg
    cdef gl.GLfloat* _fg
    #
    # Don't bother rendering if either the font or text don't exist
    if not (self._font and self._text) :
      return
    #
    # Lock against rendering
    py.PyThread_acquire_lock(self._mutex,1)
    #
    # Clear the background
    cairo.cairo_save(self._context)
    _bg = (<soy.colors.Color> self._background)._rgba
    cairo.cairo_set_source_rgba(self._context, _bg[0], _bg[1], _bg[2], _bg[3])
    cairo.cairo_set_operator(self._context, cairo.CAIRO_OPERATOR_SOURCE)
    cairo.cairo_paint(self._context)
    cairo.cairo_restore(self._context)
    #
    # Now draw
    cairo.cairo_select_font_face(self._context,
                                 self._font,
                                 cairo.CAIRO_FONT_SLANT_NORMAL, 
                                 cairo.CAIRO_FONT_WEIGHT_BOLD)
    cairo.cairo_set_font_size(self._context, 32.0)
    _fg = (<soy.colors.Color> self._foreground)._rgba
    cairo.cairo_set_source_rgba(self._context, _fg[0], _fg[1], _fg[2], _fg[3])
    cairo.cairo_move_to(self._context, 10.0, 50.0)
    cairo.cairo_show_text(self._context, self._text)
    #
    # By setting the _update flag we cause self._texels to be re-sent to GPU
    self._update = 1
    #
    # Release the lock
    py.PyThread_release_lock(self._mutex)