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@Ryex
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wxPython + Pyglet
"""
LICENSE
Copyright (c) 2014, Rachel Powers All rights reserved.
This program is free software; you can redistribute it and/or modify it under
the terms of the BSD license: http://opensource.org/licenses/BSD-3-Clause
"""
import wx
from wx import glcanvas
import pyglet
# this line is very important, we're tricking pyglet into thinking there is a context avalible
# but we can't make it work with the shadow window that alows sharing of
# object between contexts
pyglet.options['shadow_window'] = False
# now that that is set we can import gl and get on our way
from pyglet import gl
class PygletGLPanel(wx.Panel):
'''A simple class for using pyglet OpenGL with wxPython.'''
def __init__(self, parent, id, pos=wx.DefaultPosition,
size=wx.DefaultSize, style=0):
# Forcing a no full repaint to stop flickering
style = style | wx.NO_FULL_REPAINT_ON_RESIZE
self.FIRST_PAINT = False
# call super function
super(PygletGLPanel, self).__init__(parent, id, pos, size, style)
# init gl canvas data
self.GLinitialized = False
attribList = (glcanvas.WX_GL_RGBA, # RGBA
glcanvas.WX_GL_DOUBLEBUFFER, # Double Buffered
glcanvas.WX_GL_DEPTH_SIZE, 24) # 24 bit
# Create the canvas
self.sizer = wx.BoxSizer(wx.HORIZONTAL)
self.canvas = glcanvas.GLCanvas(self, attribList=attribList)
if wx.VERSION >= (2, 9):
self.context = glcanvas.GLContext(self.canvas)
self.sizer.Add(self.canvas, 1, wx.EXPAND)
self.SetSizer(self.sizer)
self.Layout()
# bind events
self.canvas.Bind(
wx.EVT_ERASE_BACKGROUND, self.processEraseBackgroundEvent)
self.canvas.Bind(wx.EVT_SIZE, self.processSizeEvent)
self.canvas.Bind(wx.EVT_PAINT, self.processPaintEvent)
#==========================================================================
# Canvas Proxy Methods
#==========================================================================
def GetGLExtents(self):
'''Get the extents of the OpenGL canvas.'''
return self.canvas.GetClientSize()
def SwapBuffers(self):
'''Swap the OpenGL buffers.'''
self.canvas.SwapBuffers()
#==========================================================================
# wxPython Window Handlers
#==========================================================================
def processEraseBackgroundEvent(self, event):
'''Process the erase background event.'''
pass # Do nothing, to avoid flashing on MSWin
def processSizeEvent(self, event):
'''Process the resize event.'''
if wx.VERSION >= (2, 9):
wx.CallAfter(self.doSetViewport)
else:
self.doSetViewport()
event.Skip()
def doSetViewport(self):
if wx.VERSION >= (2, 9):
self.Show()
self.PrepareGL()
# Make sure the frame is shown before calling SetCurrent.
self.canvas.SetCurrent(self.context)
size = self.GetGLExtents()
self.winsize = (size.width, size.height)
self.width, self.height = size.width, size.height
if self.width < 0:
self.width = 1
if self.height < 0:
self.height = 1
self.OnReshape(size.width, size.height)
self.canvas.Refresh(False)
else:
if self.canvas.GetContext():
# Make sure the frame is shown before calling SetCurrent.
self.Show()
self.PrepareGL()
self.canvas.SetCurrent()
size = self.GetGLExtents()
self.winsize = (size.width, size.height)
self.width, self.height = size.width, size.height
if self.width < 0:
self.width = 1
if self.height < 0:
self.height = 1
self.OnReshape(size.width, size.height)
self.canvas.Refresh(False)
def PrepareGL(self):
if wx.VERSION >= (2, 9):
self.canvas.SetCurrent(self.context)
else:
self.canvas.SetCurrent()
# initialize OpenGL only if we need to
if not self.GLinitialized:
self.OnInitGL()
self.GLinitialized = True
size = self.GetGLExtents()
self.OnReshape(size.width, size.height)
self.pygletcontext.set_current()
def processPaintEvent(self, event):
'''Process the drawing event.'''
if not self.FIRST_PAINT:
self.FIRST_PAINT = True
self.PrepareGL()
self.OnDraw()
event.Skip()
def Destroy(self):
# clean up the pyglet OpenGL context
self.pygletcontext.destroy()
# call the super metho
super(wx.Panel, self).Destroy()
#==========================================================================f
# GLFrame OpenGL Event Handlers
#==========================================================================
def OnInitGL(self):
'''Initialize OpenGL for use in the window.'''
# create a pyglet context for this panel
#self.pygletcontext = gl.Context(gl.current_context)
if pyglet.version > "1.1.4":
self.pygletcontext = PygletWXContext()
else:
self.pygletcontext = gl.Context()
self.pygletcontext.set_current()
# normal gl init
gl.glEnable(gl.GL_BLEND)
gl.glBlendFunc(gl.GL_SRC_ALPHA, gl.GL_ONE_MINUS_SRC_ALPHA)
gl.glEnable(gl.GL_TEXTURE_2D)
gl.glClearColor(1, 1, 1, 1)
# create objects to draw
self.create_objects()
def OnReshape(self, width, height):
'''Reshape the OpenGL viewport based on the dimensions of the window.'''
# CORRECT WIDTH AND HEIGHT
if width <= 0:
width = 1
if height <= 0:
height = 1
if self.GLinitialized:
self.pygletcontext.set_current()
gl.glViewport(0, 0, width, height)
gl.glMatrixMode(gl.GL_PROJECTION)
gl.glLoadIdentity()
gl.glOrtho(0, width, 0, height, 1, -1)
gl.glMatrixMode(gl.GL_MODELVIEW)
if self.GLinitialized:
self.update_object_resize(width, height)
def OnDraw(self, *args, **kwargs):
"Draw the window."
# clear the context
gl.glClear(gl.GL_COLOR_BUFFER_BIT | gl.GL_DEPTH_BUFFER_BIT)
# draw objects
self.draw_objects()
# update screen
self.SwapBuffers()
#==========================================================================
# To be implemented by a sub class
#==========================================================================
def create_objects(self):
'''create opengl objects when opengl is initialized'''
pass
def update_object_resize(self, width, height):
'''called when the window receives only if opengl is initialized'''
pass
def draw_objects(self):
'''called in the middle of ondraw after the buffer has been cleared'''
pass
class PygletWXContext(gl.Context):
def __init__(self, config=None, context_share=None):
self.config = config
self.context_share = context_share
self.canvas = None
if context_share:
self.object_space = context_share.object_space
else:
self.object_space = gl.ObjectSpace()
def attach(self, canvas=None):
pass
def detach(self):
pass
def set_current(self):
# XXX not per-thread
gl.current_context = self
# XXX
gl.gl_info.set_active_context()
gl.glu_info.set_active_context()
# Implement workarounds
if not self._info:
self._info = gl.gl_info.GLInfo()
self._info.set_active_context()
for attr, check in self._workaround_checks:
setattr(self, attr, check(self._info))
# Release textures and buffers on this context scheduled for deletion.
# Note that the garbage collector may introduce a race condition,
# so operate on a copy of the textures/buffers and remove the deleted
# items using list slicing (which is an atomic operation)
if self.object_space._doomed_textures:
textures = self.object_space._doomed_textures[:]
textures = (gl.GLuint * len(textures))(*textures)
gl.glDeleteTextures(len(textures), textures)
self.object_space._doomed_textures[0:len(textures)] = []
if self.object_space._doomed_buffers:
buffers = self.object_space._doomed_buffers[:]
buffers = (gl.GLuint * len(buffers))(*buffers)
gl.glDeleteBuffers(len(buffers), buffers)
self.object_space._doomed_buffers[0:len(buffers)] = []
#-------------------------------------------------------------------------
# EditorGLPanel
#-------------------------------------------------------------------------
class EditorGLPanel(PygletGLPanel):
def __init__(self, parent, id=wx.ID_ANY, rows=1, columns=1, coord=(0, 0), drawmode=1):
"""Basic constructor for the wxGLCanvas
Arguments:
parent -- The wxWindow instance to set as this panel's parent
id -- The ID of the panel
rows -- The number of horizontal rows used for tiles
columns -- The number of vertical columns used for tiles
coord -- The coordinate of the tile that the image will draw from the source
drawmode -- An integer to decide what drawing mode will be used.
0: CropAndShrink -- Images will be both scaled down and cropped to fit
1: Shrink -- Scales image down if too large, else the image is simply centered
2: StretchAspect -- The image will be stretched to fill panel while maintaining aspect ratio
3: Cropped -- Oversized images too large for the panel will simply be cropped
4: Stretch -- The entire image is stretched, and aspect ratio is ignored
5: TopLeft -- Image is anchored to top left corner and cropped
Returns:
None
"""
super(EditorGLPanel, self).__init__(parent, id)
self._rows = rows
self._columns = columns
self._coord = coord
self._drawmode = drawmode
self._image = None
self.draw_objects()
self._contextMenu = None
self.canvas.Bind(wx.EVT_RIGHT_DOWN, self.canvas_RightClicked)
def SetRows(self, rows):
if rows < 1:
rows = 1
self._rows = rows
def SetColumns(self, columns):
if columns < 1:
columns = 1
self._columns = columns
def canvas_RightClicked(self, event):
"""Creates the context menu if necessary, then displays it"""
if self._contextMenu is None:
self._createContextMenu()
self._contextMenu.Check(self._drawmode, True)
self.canvas.PopupMenu(self._contextMenu, event.GetPosition())
def menuItem_SelectionChanged(self, event):
"""updates the draw mode"""
self.SetDrawMode(event.GetId())
def _createContextMenu(self):
"""Creates the context menu on demand"""
self._contextMenu = wx.Menu()
self.menuItemCropAndShrink = wx.MenuItem(
self._contextMenu, 0, "Crop and Shrink", "Oversized images will be scaled and cropped evenly", wx.ITEM_RADIO)
self._contextMenu.AppendItem(self.menuItemCropAndShrink)
self.menuItemCropAndShrink.Check(True)
self.menuItemShrink = wx.MenuItem(
self._contextMenu, 1, "Shrink", "Oversized images will scale to the windows size while maintaining aspect ratio", wx.ITEM_RADIO)
self._contextMenu.AppendItem(self.menuItemShrink)
self.menuItemStretchAspect = wx.MenuItem(
self._contextMenu, 2, "Stretch Aspect", "Images will expand to fill the window while maintaining aspect ratio", wx.ITEM_RADIO)
self._contextMenu.AppendItem(self.menuItemStretchAspect)
self.menuItemCrop = wx.MenuItem(
self._contextMenu, 3, "Crop", "Image will be cropped to the window's size", wx.ITEM_RADIO)
self._contextMenu.AppendItem(self.menuItemCrop)
self.menuItemStretch = wx.MenuItem(
self._contextMenu, 4, "Stretch", "Image will be stretched to fill the window and ignore the aspect ratio", wx.ITEM_RADIO)
self._contextMenu.AppendItem(self.menuItemStretch)
self.menuItemNone = wx.MenuItem(
self._contextMenu, 5, "None", "No resizing, cropping, or centering will be performed", wx.ITEM_RADIO)
self._contextMenu.AppendItem(self.menuItemNone)
self.Bind(wx.EVT_MENU, self.menuItem_SelectionChanged,
id=self.menuItemCropAndShrink.GetId())
self.Bind(wx.EVT_MENU, self.menuItem_SelectionChanged,
id=self.menuItemShrink.GetId())
self.Bind(wx.EVT_MENU, self.menuItem_SelectionChanged,
id=self.menuItemStretchAspect.GetId())
self.Bind(wx.EVT_MENU, self.menuItem_SelectionChanged,
id=self.menuItemCrop.GetId())
self.Bind(wx.EVT_MENU, self.menuItem_SelectionChanged,
id=self.menuItemStretch.GetId())
self.Bind(wx.EVT_MENU, self.menuItem_SelectionChanged,
id=self.menuItemNone.GetId())
def ChangeImage(self, pilImage):
"""Changes the displayed image"""
self._image = pilImage
del (pilImage)
if self.FIRST_PAINT:
self.PrepareGL()
self.OnDraw()
def GetDrawMode(self):
"""Returns the integer value that represents the current drawing mode"""
return self._drawmode
def SetDrawMode(self, drawmode):
"""Sets the drawing mode and refreshes the display"""
self._drawmode = drawmode
if self.FIRST_PAINT:
self.PrepareGL()
self.OnDraw()
def draw_objects(self):
"""Draws the objects on the canvas"""
if not self.GLinitialized:
return
# clear the screen
gl.glClearColor(0.93, 0.93, 0.93, 1)
gl.glClear(gl.GL_COLOR_BUFFER_BIT | gl.GL_DEPTH_BUFFER_BIT)
if self._image is None:
return
# Convert PIL image to pyglet image
srcImage = pyglet.image.create(*self._image.size).get_image_data()
pitch = -len('RGBA') * srcImage.width
data = self._image.tostring()
srcImage.set_data('RGBA', pitch, data)
# Clear the canvas and calculate the region to draw
tile_width = srcImage.width // self._rows
tile_height = srcImage.height // self._columns
x = self._coord[0] * tile_width
y = self._coord[1] * tile_height
y = srcImage.height - y - tile_height
subimage = srcImage.get_region(x, y, tile_width, tile_height)
subimage.align_x = subimage.align_y = 0
# Branch by what mode is selected to draw
if self._drawmode == 0:
self.CropAndShrink(subimage)
elif self._drawmode == 1:
self.Shrink(subimage)
elif self._drawmode == 2:
self.StretchAspect(subimage)
elif self._drawmode == 3:
self.Cropped(subimage)
elif self._drawmode == 4:
self.Stretch(subimage)
else:
self.TopLeft(subimage)
del (srcImage)
#---------------------------------------------------------------
# Draw Modes
#---------------------------------------------------------------
def CropAndShrink(self, pygletimage):
"""Images will be both scaled down and cropped to fit"""
width, height = self.GetClientSize()
w, h = pygletimage.width, pygletimage.height
x, y, = (width - w) // 2, (height - h) // 2
if width < w or height < h:
diff_w = (w - width) // 2
diff_h = (h - height) // 2
pygletimage.blit(x // 2, y // 2, 0, w - diff_w, h - diff_h)
else:
pygletimage.blit(x, y, 0, w, h)
del (pygletimage)
def Shrink(self, pygletimage):
"""Scales image down if too large, else the image is simply centered"""
width, height = self.GetClientSize()
w, h = pygletimage.width, pygletimage.height
x, y, = (width - w) // 2, (height - h) // 2
if width < w or height < h:
self.StretchAspect(pygletimage)
else:
pygletimage.blit(x, y, 0, w, h)
del (pygletimage)
def StretchAspect(self, pygletimage):
"""The image will be stretched to fill panel while maintaining aspect ratio"""
width, height = self.GetClientSize()
w, h = pygletimage.width, pygletimage.height
x_ratio = float(width) / w
y_ratio = float(height) / h
if y_ratio > x_ratio:
ch = h * x_ratio
pygletimage.blit(0, (height - ch) // 2, 0, width, ch)
else:
cw = w * y_ratio
pygletimage.blit((width - cw) // 2, 0, 0, cw, height)
del (pygletimage)
def Cropped(self, pygletimage):
"""Oversized images too large for the panel will simply be cropped"""
width, height = self.GetClientSize()
w, h = pygletimage.width, pygletimage.height
x, y = (width - w) // 2, (height - h) // 2
if w > width:
x = (width - w) // 2
if h > height:
y = (height - h) // 2
pygletimage.blit(x, y, 0, w, h)
del (pygletimage)
def Stretch(self, pygletimage):
"""The entire image is stretched, and aspect ratio is ignored"""
width, height = self.GetClientSize()
pygletimage.blit(0, 0, 0, width, height)
def TopLeft(self, pygletimage):
"""Image is anchored to top left corner and cropped"""
y = self.GetClientSize()[1] - pygletimage.height
pygletimage.blit(0, y, 0, pygletimage.width, pygletimage.height)
del (pygletimage)
@Ryex
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Ryex commented Aug 2, 2022

@alexdewar This code was developed as part of my work on ARC many years ago. ARC is BSD licensed so as far as I'm concerned this code is too. I'll add it to the top of the file.

@alexdewar
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Thank you! 😄

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