47 lines
1.5 KiB
Python
47 lines
1.5 KiB
Python
"""
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CSV export test
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"""
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from __future__ import division, print_function, absolute_import
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import pyqtgraph as pg
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import csv
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import tempfile
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app = pg.mkQApp()
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def approxeq(a, b):
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return (a-b) <= ((a + b) * 1e-6)
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def test_CSVExporter():
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plt = pg.plot()
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y1 = [1,3,2,3,1,6,9,8,4,2]
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plt.plot(y=y1, name='myPlot')
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y2 = [3,4,6,1,2,4,2,3,5,3,5,1,3]
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x2 = pg.np.linspace(0, 1.0, len(y2))
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plt.plot(x=x2, y=y2)
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y3 = [1,5,2,3,4,6,1,2,4,2,3,5,3]
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x3 = pg.np.linspace(0, 1.0, len(y3)+1)
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plt.plot(x=x3, y=y3, stepMode="center")
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ex = pg.exporters.CSVExporter(plt.plotItem)
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with tempfile.NamedTemporaryFile(mode="w+t", suffix='.csv', encoding="utf-8", delete=False) as tf:
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print("using %s as a temporary file" % tf.name)
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ex.export(fileName=tf.name)
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lines = [line for line in csv.reader(tf)]
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header = lines.pop(0)
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assert header == ['myPlot_x', 'myPlot_y', 'x0001', 'y0001', 'x0002', 'y0002']
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for i, vals in enumerate(lines):
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vals = list(map(str.strip, vals))
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assert (i >= len(y1) and vals[0] == '') or approxeq(float(vals[0]), i)
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assert (i >= len(y1) and vals[1] == '') or approxeq(float(vals[1]), y1[i])
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assert (i >= len(x2) and vals[2] == '') or approxeq(float(vals[2]), x2[i])
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assert (i >= len(y2) and vals[3] == '') or approxeq(float(vals[3]), y2[i])
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assert (i >= len(x3) and vals[4] == '') or approxeq(float(vals[4]), x3[i])
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assert (i >= len(y3) and vals[5] == '') or approxeq(float(vals[5]), y3[i])
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