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# -*- coding: utf-8 -*-
# vispy: testskip
# -----------------------------------------------------------------------------
# Copyright (c) Vispy Development Team. All Rights Reserved.
# Distributed under the (new) BSD License. See LICENSE.txt for more info.
# -----------------------------------------------------------------------------
"""
This is a very simple example that demonstrates using a shared context
between two Qt widgets.
"""
# XXX THIS IS CURRENTLY BROKEN
from PyQt5 import QtWidgets, QtCore # can also use pyside
from functools import partial
from vispy.app import Timer
from vispy.scene.visuals import Text
from vispy.scene.widgets import ViewBox
from vispy.scene import SceneCanvas
def on_resize(canvas, vb, event):
vb.pos = 1, 1
vb.size = (canvas.size[0] - 2, canvas.size[1] - 2)
class Window(QtWidgets.QWidget):
def __init__(self):
super(Window, self).__init__()
box = QtWidgets.QBoxLayout(QtWidgets.QBoxLayout.LeftToRight, self)
self.resize(500, 200)
self.setLayout(box)
self.canvas_0 = SceneCanvas(bgcolor='w')
self.vb_0 = ViewBox(parent=self.canvas_0.scene, bgcolor='r')
self.vb_0.camera.rect = -1, -1, 2, 2
self.canvas_0.events.initialize.connect(self.on_init)
self.canvas_0.events.resize.connect(partial(on_resize,
self.canvas_0,
self.vb_0))
box.addWidget(self.canvas_0.native)
# pass the context from the first canvas to the second
self.canvas_1 = SceneCanvas(bgcolor='w', shared=self.canvas_0.context)
self.vb_1 = ViewBox(parent=self.canvas_1.scene, bgcolor='b')
self.vb_1.camera.rect = -1, -1, 2, 2
self.canvas_1.events.resize.connect(partial(on_resize,
self.canvas_1,
self.vb_1))
box.addWidget(self.canvas_1.native)
self.tick_count = 0
self.timer = Timer(interval=1., connect=self.on_timer, start=True)
self.setWindowTitle('Shared contexts')
self.show()
def on_init(self, event):
self.text = Text('Initialized', font_size=40.,
anchor_x='left', anchor_y='top',
parent=[self.vb_0.scene, self.vb_1.scene])
def on_timer(self, event):
self.tick_count += 1
self.text.text = 'Tick #%s' % self.tick_count
self.canvas_0.update()
self.canvas_1.update()
def keyPressEvent(self, event):
if event.key() == QtCore.Qt.Key_Escape:
self.close()
elif event.key() == QtCore.Qt.Key_F11:
self.showNormal() if self.isFullScreen() else self.showFullScreen()
if __name__ == '__main__':
qt_app = QtWidgets.QApplication([])
ex = Window()
qt_app.exec_()
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