From 8a6640c4190b0f40b2794495160f2458d6e3a80c Mon Sep 17 00:00:00 2001
From: KIU Shueng Chuan <nixchuan@gmail.com>
Date: Mon, 19 Jul 2021 04:52:49 +0800
Subject: [PATCH] treat self.opts as private. provide accessors

---
 examples/GLPainterItem.py        |  5 +++--
 pyqtgraph/opengl/GLViewWidget.py | 16 ++++++++++++++++
 2 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/examples/GLPainterItem.py b/examples/GLPainterItem.py
index 3b3678ea..683e4dc5 100644
--- a/examples/GLPainterItem.py
+++ b/examples/GLPainterItem.py
@@ -48,9 +48,10 @@ class GLPainterItem(pg.opengl.GLGraphicsItem.GLGraphicsItem):
         painter.drawText(rect, af.AlignBottom | af.AlignLeft, 'BL')
         painter.drawText(rect, af.AlignBottom | af.AlignRight, 'BR')
 
-        opts = self.view().opts
+        opts = self.view().getCameraPosition()
+        opts['fov'] = self.view().fov()
         lines = []
-        center = opts['center']
+        center = opts['pos']
         lines.append(f"center : ({center.x():.1f}, {center.y():.1f}, {center.z():.1f})")
         for key in ['distance', 'fov', 'elevation', 'azimuth']:
             lines.append(f"{key} : {opts[key]:.1f}")
diff --git a/pyqtgraph/opengl/GLViewWidget.py b/pyqtgraph/opengl/GLViewWidget.py
index 723b288b..97aa1fda 100644
--- a/pyqtgraph/opengl/GLViewWidget.py
+++ b/pyqtgraph/opengl/GLViewWidget.py
@@ -308,6 +308,22 @@ class GLViewWidget(QtWidgets.QOpenGLWidget):
 
         self.update()
         
+    def getCameraPosition(self):
+        opts = { 'pos': self.opts['center'],
+                 'distance' : self.opts['distance'] }
+        if self.opts['rotationMethod'] == "quaternion":
+            opts['rotation'] = self.opts['rotation']
+        else:
+            opts['elevation'] = self.opts['elevation']
+            opts['azimuth'] = self.opts['azimuth']
+        return opts
+
+    def setFov(self, fov):
+        self.opts['fov'] = fov
+
+    def fov(self):
+        return self.opts['fov']
+
     def cameraPosition(self):
         """Return current position of camera based on center, dist, elevation, and azimuth"""
         center = self.opts['center']