Merge pull request #1871 from pijyoi/opengl_init

Allow adding items to GLViewWidget before show

examples/GLViewWidget.py

@@ -6,10 +6,10 @@ Very basic 3D graphics example; create a view widget and add a few items.
 ## Add path to library (just for examples; you do not need this)
 import initExample
 
-from pyqtgraph.Qt import QtCore, QtGui, mkQApp
+import pyqtgraph as pg
 import pyqtgraph.opengl as gl
 
-app = mkQApp("GLViewWidget Example")
+pg.mkQApp("GLViewWidget Example")
 w = gl.GLViewWidget()
 w.opts['distance'] = 20
 w.show()

pyqtgraph/opengl/GLGraphicsItem.py

@@ -1,8 +1,7 @@
 from OpenGL.GL import *
 from OpenGL import GL
-from ..Qt import QtGui, QtCore
+from ..Qt import QtCore
 from .. import Transform3D
-from ..python2_3 import basestring
 
 
 GLOptions = {
@@ -42,6 +41,7 @@ class GLGraphicsItem(QtCore.QObject):
         self.__children = set()
         self.__transform = Transform3D()
         self.__visible = True
+        self.__initialized = False
         self.setParentItem(parentItem)
         self.setDepthValue(0)
         self.__glOpts = {}
@@ -91,7 +91,7 @@ class GLGraphicsItem(QtCore.QObject):
             
         
         """
-        if isinstance(opts, basestring):
+        if isinstance(opts, str):
             opts = GLOptions[opts]
         self.__glOpts = opts.copy()
         self.update()
@@ -228,6 +228,12 @@ class GLGraphicsItem(QtCore.QObject):
         view, as it may be obscured or outside of the current view area."""
         return self.__visible
     
+    def initialize(self):
+        self.initializeGL()
+        self.__initialized = True
+
+    def isInitialized(self):
+        return self.__initialized
     
     def initializeGL(self):
         """
@@ -245,7 +251,7 @@ class GLGraphicsItem(QtCore.QObject):
         for k,v in self.__glOpts.items():
             if v is None:
                 continue
-            if isinstance(k, basestring):
+            if isinstance(k, str):
                 func = getattr(GL, k)
                 func(*v)
             else:

pyqtgraph/opengl/GLViewWidget.py

@@ -1,4 +1,4 @@
-from ..Qt import QtCore, QtGui, QtWidgets, QT_LIB
+from ..Qt import QtCore, QtGui, QtWidgets
 from OpenGL.GL import *
 import OpenGL.GL.framebufferobjects as glfbo
 import numpy as np
@@ -8,7 +8,6 @@ import warnings
 from math import cos, sin, tan, radians
 ##Vector = QtGui.QVector3D
 
-ShareWidget = None
 
 class GLViewWidget(QtWidgets.QOpenGLWidget):
     
@@ -99,10 +98,11 @@ class GLViewWidget(QtWidgets.QOpenGLWidget):
 
     def addItem(self, item):
         self.items.append(item)
-        if hasattr(item, 'initializeGL'):
+
+        if self.isValid():
             self.makeCurrent()
             try:
-                item.initializeGL()
+                item.initialize()
             except:
                 self.checkOpenGLVersion('Error while adding item %s to GLViewWidget.' % str(item))
                 
@@ -128,7 +128,12 @@ class GLViewWidget(QtWidgets.QOpenGLWidget):
         self.update()        
         
     def initializeGL(self):
-        self.resizeGL(self.width(), self.height())
+        """
+        Initialize items that were not initialized during addItem().
+        """
+        for item in self.items:
+            if not item.isInitialized():
+                item.initialize()
         
     def setBackgroundColor(self, *args, **kwds):
         """
@@ -463,13 +468,9 @@ class GLViewWidget(QtWidgets.QOpenGLWidget):
         #self.swapBuffers()
         
     def wheelEvent(self, ev):
-        delta = 0
-        if QT_LIB in ['PyQt4', 'PySide']:
-            delta = ev.delta()
-        else:
-            delta = ev.angleDelta().x()
-            if delta == 0:
-                delta = ev.angleDelta().y()
+        delta = ev.angleDelta().x()
+        if delta == 0:
+            delta = ev.angleDelta().y()
         if (ev.modifiers() & QtCore.Qt.KeyboardModifier.ControlModifier):
             self.opts['fov'] *= 0.999**delta
         else:

pyqtgraph/opengl/items/GLLinePlotItem.py

@@ -54,9 +54,6 @@ class GLLinePlotItem(GLGraphicsItem):
                 #self.vbo.pop(arg, None)
         self.update()
 
-    def initializeGL(self):
-        pass
-        
     def paint(self):
         if self.pos is None:
             return

pyqtgraph/widgets/GraphicsView.py

@@ -317,13 +317,9 @@ class GraphicsView(QtGui.QGraphicsView):
         super().wheelEvent(ev)
         if not self.mouseEnabled:
             return
-        delta = 0
-        if QT_LIB in ['PyQt4', 'PySide']:
-            delta = ev.delta()
-        else:
-            delta = ev.angleDelta().x()
-            if delta == 0:
-                delta = ev.angleDelta().y()
+        delta = ev.angleDelta().x()
+        if delta == 0:
+            delta = ev.angleDelta().y()
                 
         sc = 1.001 ** delta
         #self.scale *= sc