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# This currenly only tests that the backend exists and can be imported ...
import numpy as np
from vispy import gloo
from vispy.app import Application, Canvas
from vispy.app.backends import _jupyter_rfb
from vispy.testing import run_tests_if_main, requires_application
import pytest
try:
import jupyter_rfb
except ImportError:
jupyter_rfb = None
def test_rfb_app():
# Raw
app_backend = _jupyter_rfb.ApplicationBackend()
# Test that run and quit don't do anything - Jupyter is an interactive session!
app_backend._vispy_run()
app_backend._vispy_quit()
class MyCanvas(Canvas):
def on_draw(self, event):
gloo.set_clear_color((0, 1, 0))
gloo.clear()
@pytest.mark.skipif(jupyter_rfb is None, reason='jupyter_rfb is not installed')
@requires_application()
def test_rfb_canvas():
app = Application("jupyter_rfb")
canvas = MyCanvas(app=app)
canvas_backend = canvas.native
assert isinstance(canvas_backend, _jupyter_rfb.CanvasBackend)
# Check that resize works
assert "42" not in canvas_backend.css_width
canvas.size = 42, 42
assert canvas_backend.css_width == "42px"
# Manually mimic what a browser would do, but round to 50
canvas_backend.handle_event({"event_type": "resize", "width": 50, "height": 50, "pixel_ratio": 2.0})
assert canvas.size == (50, 50)
assert canvas.physical_size == (100, 100)
# Mimic a draw
frame = canvas_backend.get_frame()
assert frame.shape[:2] == (100, 100)
assert np.all(frame[:, :, 0] == 0)
assert np.all(frame[:, :, 1] == 255)
# Pretend that the user resized in the browser
canvas_backend.handle_event({"event_type": "resize", "width": 60, "height": 60, "pixel_ratio": 1.0})
assert canvas.size == (60, 60)
assert canvas.physical_size == (60, 60)
# Mimic another draw
frame = canvas_backend.get_frame()
assert frame.shape[:2] == (60, 60)
assert np.all(frame[:, :, 0] == 0)
assert np.all(frame[:, :, 1] == 255)
# Test mouse event
events = []
canvas.events.mouse_press.connect(lambda e: events.append(e))
canvas_backend.handle_event({"event_type": "pointer_down", "x": 11, "y": 12, "button": 1, "modifiers": []})
assert len(events) == 1
assert tuple(events[0].pos) == (11, 12)
run_tests_if_main()
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