fix bug when plotting boolean arrays (#1748)

* test and fix for plotting boolean arrays

* smaller is faster

* oh, that bool went away

* tests should keep up with optimizations

pyqtgraph/graphicsItems/PlotDataItem.py

@@ -639,6 +639,11 @@ class PlotDataItem(GraphicsObject):
             x = self.xData
             y = self.yData
 
+            if y.dtype == bool:
+                y = y.astype(np.uint8)
+            if x.dtype == bool:
+                x = x.astype(np.uint8)
+
             if self.opts['fftMode']:
                 x,y = self._fourierTransform(x, y)
                 # Ignore the first bin for fft data if we have a logx scale

pyqtgraph/graphicsItems/tests/test_PlotDataItem.py

@@ -1,3 +1,4 @@
+# -*- coding: utf-8 -*-
 import numpy as np
 import pyqtgraph as pg
 from pyqtgraph.Qt import QtGui
@@ -5,6 +6,16 @@ from pyqtgraph.Qt import QtGui
 pg.mkQApp()
 
 
+def test_bool():
+    truths = np.random.randint(0, 2, size=(100,)).astype(bool)
+    pdi = pg.PlotDataItem(truths)
+    bounds = pdi.dataBounds(1)
+    assert isinstance(bounds[0], np.uint8)
+    assert isinstance(bounds[1], np.uint8)
+    xdata, ydata = pdi.getData()
+    assert ydata.dtype == np.uint8
+
+
 def test_fft():
     f = 20.
     x = np.linspace(0, 1, 1000)