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#
# Copyright 2008, 2009, 2010 Free Software Foundation, Inc.
#
# This file is part of GNU Radio
#
# GNU Radio is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3, or (at your option)
# any later version.
#
# GNU Radio 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with GNU Radio; see the file COPYING. If not, write to
# the Free Software Foundation, Inc., 51 Franklin Street,
# Boston, MA 02110-1301, USA.
#
import wx
import wx.glcanvas
from OpenGL import GL
import common
BACKGROUND_COLOR_SPEC = (1, 0.976, 1, 1) #creamy white
##################################################
# GL caching interface
##################################################
class gl_cache(object):
"""
Cache a set of gl drawing routines in a compiled list.
"""
def __init__(self, draw):
"""
Create a new cache.
@param draw a function to draw gl stuff
"""
self.changed(True)
self._draw = draw
def init(self):
"""
To be called when gl initializes.
Create a new compiled list.
"""
self._grid_compiled_list_id = GL.glGenLists(1)
def draw(self):
"""
Draw the gl stuff using a compiled list.
If changed, reload the compiled list.
"""
if self.changed():
GL.glNewList(self._grid_compiled_list_id, GL.GL_COMPILE)
self._draw()
GL.glEndList()
self.changed(False)
#draw the grid
GL.glCallList(self._grid_compiled_list_id)
def changed(self, state=None):
"""
Set the changed flag if state is not None.
Otherwise return the changed flag.
"""
if state is None: return self._changed
self._changed = state
##################################################
# OpenGL WX Plotter Canvas
##################################################
class plotter_base(wx.glcanvas.GLCanvas, common.mutex):
"""
Plotter base class for all plot types.
"""
def __init__(self, parent):
"""
Create a new plotter base.
Initialize the GLCanvas with double buffering.
Initialize various plotter flags.
Bind the paint and size events.
@param parent the parent widgit
"""
attribList = (wx.glcanvas.WX_GL_DOUBLEBUFFER, wx.glcanvas.WX_GL_RGBA)
wx.glcanvas.GLCanvas.__init__(self, parent, attribList=attribList);
self.use_persistence=False
self.persist_alpha=2.0/15
self.clear_accum=True
self._gl_init_flag = False
self._resized_flag = True
self._init_fcns = list()
self._draw_fcns = list()
self._gl_caches = list()
self.Bind(wx.EVT_PAINT, self._on_paint)
self.Bind(wx.EVT_SIZE, self._on_size)
self.Bind(wx.EVT_ERASE_BACKGROUND, lambda e: None)
def set_use_persistence(self,enable):
self.use_persistence=enable
self.clear_accum=True
def set_persist_alpha(self,analog_alpha):
self.persist_alpha=analog_alpha
def new_gl_cache(self, draw_fcn, draw_pri=50):
"""
Create a new gl cache.
Register its draw and init function.
@return the new cache object
"""
cache = gl_cache(draw_fcn)
self.register_init(cache.init)
self.register_draw(cache.draw, draw_pri)
self._gl_caches.append(cache)
return cache
def register_init(self, init_fcn):
self._init_fcns.append(init_fcn)
def register_draw(self, draw_fcn, draw_pri=50):
"""
Register a draw function with a layer priority.
Large pri values are drawn last.
Small pri values are drawn first.
"""
for i in range(len(self._draw_fcns)):
if draw_pri < self._draw_fcns[i][0]:
self._draw_fcns.insert(i, (draw_pri, draw_fcn))
return
self._draw_fcns.append((draw_pri, draw_fcn))
def _on_size(self, event):
"""
Flag the resize event.
The paint event will handle the actual resizing.
"""
self.lock()
self._resized_flag = True
self.clear_accum=True
self.unlock()
def _on_paint(self, event):
"""
Respond to paint events.
Initialize GL if this is the first paint event.
Resize the view port if the width or height changed.
Redraw the screen, calling the draw functions.
"""
self.lock()
self.SetCurrent()
# check if gl was initialized
if not self._gl_init_flag:
GL.glClearColor(*BACKGROUND_COLOR_SPEC)
for fcn in self._init_fcns: fcn()
self._gl_init_flag = True
# check for a change in window size
if self._resized_flag:
self.width, self.height = self.GetSize()
GL.glMatrixMode(GL.GL_PROJECTION)
GL.glLoadIdentity()
GL.glOrtho(0, self.width, self.height, 0, 1, 0)
GL.glMatrixMode(GL.GL_MODELVIEW)
GL.glLoadIdentity()
GL.glViewport(0, 0, self.width, self.height)
for cache in self._gl_caches: cache.changed(True)
self._resized_flag = False
# clear buffer if needed
if self.clear_accum or not self.use_persistence:
GL.glClear(GL.GL_COLOR_BUFFER_BIT)
self.clear_accum=False
# apply fading
if self.use_persistence:
GL.glEnable(GL.GL_BLEND)
GL.glBlendFunc(GL.GL_SRC_ALPHA, GL.GL_ONE_MINUS_SRC_ALPHA)
GL.glBegin(GL.GL_QUADS)
GL.glColor4f(1,1,1,self.persist_alpha)
GL.glVertex2f(0, self.height)
GL.glVertex2f(self.width, self.height)
GL.glVertex2f(self.width, 0)
GL.glVertex2f(0, 0)
GL.glEnd()
GL.glDisable(GL.GL_BLEND)
# draw functions
for fcn in self._draw_fcns: fcn[1]()
# show result
self.SwapBuffers()
self.unlock()
def update(self):
"""
Force a paint event.
"""
if not self._gl_init_flag: return
wx.PostEvent(self, wx.PaintEvent())
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