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# -*- coding: utf-8 -*-
# -----------------------------------------------------------------------------
# Copyright (c) Vispy Development Team. All Rights Reserved.
# Distributed under the (new) BSD License. See LICENSE.txt for more info.
# -----------------------------------------------------------------------------
"""Tests for AxisVisual"""
from numpy.testing import assert_allclose, assert_array_equal
from vispy import scene
from vispy.scene import visuals
from vispy.testing import (requires_application, TestingCanvas,
run_tests_if_main)
@requires_application()
def test_axis():
with TestingCanvas() as c:
axis = visuals.Axis(pos=[[-1.0, 0], [1.0, 0]], parent=c.scene)
c.draw_visual(axis)
@requires_application()
def test_axis_zero_domain():
# Regression test for a bug that caused an overflow error when the domain
# min was same as max
with TestingCanvas() as c:
axis = visuals.Axis(pos=[[-1.0, 0], [1.0, 0]], domain=(0.5, 0.5), parent=c.scene)
c.draw_visual(axis)
@requires_application()
def test_rotation_angle():
# Make sure the rotation angle calculation is correct
canvas = scene.SceneCanvas(keys=None, size=(800, 600), show=True)
view = canvas.central_widget.add_view()
view.camera = scene.cameras.TurntableCamera(parent=view.scene,
fov=0., distance=4.0,
elevation=0, azimuth=0, roll=0.)
axis1 = visuals.Axis(pos=[[-1.0, 0], [1.0, 0]], parent=view.scene)
assert_allclose(axis1._rotation_angle, 0)
axis2 = visuals.Axis(pos=[[-3**0.5/2., -0.5], [3**0.5/2., 0.5]], parent=view.scene)
assert_allclose(axis2._rotation_angle, 0.)
view.camera.elevation = 90.
assert_allclose(axis1._rotation_angle, 0)
assert_allclose(axis2._rotation_angle, -30, rtol=1e-3)
view.camera.elevation = 45.
assert_allclose(axis1._rotation_angle, 0)
assert_allclose(axis2._rotation_angle, -22.207653, rtol=1e-3)
view.camera.fov = 20.
assert_allclose(axis1._rotation_angle, 0)
# OSX Travis has some small differences...sometimes
assert_allclose(axis2._rotation_angle, -17.056795, rtol=0.05)
@requires_application()
def test_text_position():
# Test the labels text and position of the axis depending on its domain
canvas = scene.SceneCanvas(keys=None, size=(800, 600), show=True)
view = canvas.central_widget.add_view()
view.camera = scene.cameras.PanZoomCamera(parent=view.scene)
# tick length and label margin to 0 for nice values
axis1 = visuals.Axis(pos=[[-1.0, 0], [1.0, 0]], domain=(0., 1.25),
major_tick_length=0, tick_label_margin=0,
parent=view.scene)
canvas.draw_visual(axis1)
assert_allclose(axis1._text.pos[:, 0], (-1, -0.2, 0.6))
assert_array_equal(axis1._text.text, ('0', '0.5', '1'))
# Flip the axis domain
axis1.domain = (1.25, 0.)
canvas.draw_visual(axis1)
# Text should be unchanged and positions mirrored
assert_allclose(axis1._text.pos[:, 0], (1, 0.2, -0.6))
assert_array_equal(axis1._text.text, ('0', '0.5', '1'))
@requires_application()
def test_tick_position():
# Test the position of the ticks depending on the axis domain
canvas = scene.SceneCanvas(keys=None, size=(800, 600), show=True)
view = canvas.central_widget.add_view()
view.camera = scene.cameras.PanZoomCamera(parent=view.scene)
axis1 = visuals.Axis(pos=[[-1.0, 0], [1.0, 0]], domain=(0., 1.25), parent=view.scene)
canvas.draw_visual(axis1)
# Get a nice array of x ticks positions
x_ticks_positions = axis1._ticks.pos[::2, ::2].flatten()
# Compare major ticks first
assert_allclose(x_ticks_positions[:3], (-1, -0.2, 0.6))
# Then minor ticks
assert_allclose(x_ticks_positions[3:], (-0.84, -0.68, -0.52, -0.36, -0.04, 0.12, 0.28, 0.44, 0.76, 0.92))
# Flip the axis domain
axis1.domain = (1.25, 0.)
canvas.draw_visual(axis1)
x_ticks_positions = axis1._ticks.pos[::2, ::2].flatten()
# Positions should be mirrored
assert_allclose(x_ticks_positions[:3], (1, 0.2, -0.6))
assert_allclose(x_ticks_positions[3:], (0.84, 0.68, 0.52, 0.36, 0.04, -0.12, -0.28, -0.44, -0.76, -0.92))
run_tests_if_main()
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