117 lines
2.9 KiB
Python
117 lines
2.9 KiB
Python
# -*- coding: utf-8 -*-
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import pytest
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import pyqtgraph as pg
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import numpy as np
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import math
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app = pg.mkQApp()
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def check_region(lr, bounds, exact=False, rtol=0.005):
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"""Optionally tolerant LinearRegionItem region check"""
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reg = lr.getRegion()
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if exact:
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assert reg[0] == bounds[0]
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assert reg[1] == bounds[1]
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else:
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assert math.isclose(reg[0], bounds[0], rel_tol=rtol)
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assert math.isclose(reg[1], bounds[1], rel_tol=rtol)
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@pytest.mark.parametrize("orientation", ["vertical", "horizontal"])
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def test_clip_to_plot_data_item(orientation):
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"""Vertical and horizontal LRIs clipping both bounds to a PlotDataItem"""
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# initial bounds for the LRI
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init_vals = (-1.5, 1.5)
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# data for a PlotDataItem to clip to, both inside the inial bounds
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x = np.linspace(-1, 1, 10)
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y = np.linspace(1, 1.2, 10)
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p = pg.PlotWidget()
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pdi = p.plot(x=x, y=y)
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lr = pg.LinearRegionItem(init_vals, clipItem=pdi, orientation=orientation)
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p.addItem(lr)
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app.processEvents()
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if orientation == "vertical":
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check_region(lr, x[[0, -1]])
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else:
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check_region(lr, y[[0, -1]])
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def test_disable_clip_item():
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"""LRI clipItem (ImageItem) disabled by explicit call to setBounds"""
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init_vals = (5, 40)
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p = pg.PlotWidget()
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img = pg.ImageItem(image=np.eye(20, 20))
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p.addItem(img)
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lr = pg.LinearRegionItem(init_vals, clipItem=img)
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p.addItem(lr)
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app.processEvents()
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# initial bound that was out of range snaps to the imageitem bound
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check_region(lr, (init_vals[0], img.height()), exact=True)
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# disable clipItem, move the right InfiniteLine beyond the new bound
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lr.setBounds(init_vals)
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lr.lines[1].setPos(init_vals[1] + 10)
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app.processEvents()
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check_region(lr, init_vals, exact=True)
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def test_clip_to_item_in_other_vb():
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"""LRI clip to item in a different ViewBox"""
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init_vals = (10, 50)
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img_shape = (20, 20)
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win = pg.GraphicsLayoutWidget()
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# "remote" PlotDataItem to bound to
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p1 = win.addPlot()
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img = pg.ImageItem(image=np.eye(*img_shape))
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p1.addItem(img)
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# plot the LRI lives in
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p2 = win.addPlot()
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x2 = np.linspace(-200, 200, 100)
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p2.plot(x=x2, y=x2)
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lr = pg.LinearRegionItem(init_vals)
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p2.addItem(lr)
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app.processEvents()
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# no clip item set yet, should be initial bounds
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check_region(lr, init_vals, exact=True)
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lr.setClipItem(img)
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app.processEvents()
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# snap to image width
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check_region(lr, (init_vals[0], img_shape[1]), exact=True)
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def test_clip_item_override_init_bounds():
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"""clipItem overrides bounds provided in the constructor"""
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init_vals = (-10, 10)
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init_bounds = (-5, 5)
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img_shape = (5, 5)
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p = pg.PlotWidget()
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img = pg.ImageItem(image=np.eye(*img_shape))
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p.addItem(img)
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lr = pg.LinearRegionItem(init_vals, clipItem=img, bounds=init_bounds)
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p.addItem(lr)
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app.processEvents()
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check_region(lr, (0, img_shape[1]), exact=True)
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