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minor cleanup

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This commit is contained in:
Luke Campagnola 2014-04-12 18:01:50 -04:00
parent ac90bf4c3b
commit 98dec9e954
2 changed files with 6 additions and 11 deletions
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14
examples/histogram.py
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@ -2,8 +2,6 @@
""" """
In this example we draw two different kinds of histogram. In this example we draw two different kinds of histogram.
""" """
import initExample ## Add path to library (just for examples; you do not need this) import initExample ## Add path to library (just for examples; you do not need this)
import pyqtgraph as pg import pyqtgraph as pg
@ -15,7 +13,6 @@ win.resize(800,350)
win.setWindowTitle('pyqtgraph example: Histogram') win.setWindowTitle('pyqtgraph example: Histogram')
plt1 = win.addPlot() plt1 = win.addPlot()
plt2 = win.addPlot() plt2 = win.addPlot()
plt3 = win.addPlot()
## make interesting distribution of values ## make interesting distribution of values
vals = np.hstack([np.random.normal(size=500), np.random.normal(size=260, loc=4)]) vals = np.hstack([np.random.normal(size=500), np.random.normal(size=260, loc=4)])
@ -23,17 +20,14 @@ vals = np.hstack([np.random.normal(size=500), np.random.normal(size=260, loc=4)]
## compute standard histogram ## compute standard histogram
y,x = np.histogram(vals, bins=np.linspace(-3, 8, 40)) y,x = np.histogram(vals, bins=np.linspace(-3, 8, 40))
## Using stepMode=True causes the plot to draw two lines for each sample.
## notice that len(x) == len(y)+1 ## notice that len(x) == len(y)+1
## We are required to use stepMode=True so that PlotCurveItem will interpret this data correctly. plt1.plot(x, y, stepMode=True, fillLevel=0, brush=(0,0,255,150))
curve = pg.PlotCurveItem(x, y, stepMode=True, fillLevel=0, brush=(0, 0, 255, 80))
plt1.addItem(curve)
plt2.plot(x, y, stepMode=True, fillLevel=0, brush=(0,0,255,150))
## Now draw all points as a nicely-spaced scatter plot ## Now draw all points as a nicely-spaced scatter plot
y = pg.pseudoScatter(vals, spacing=0.15) y = pg.pseudoScatter(vals, spacing=0.15)
#plt3.plot(vals, y, pen=None, symbol='o', symbolSize=5) #plt2.plot(vals, y, pen=None, symbol='o', symbolSize=5)
plt3.plot(vals, y, pen=None, symbol='o', symbolSize=5, symbolPen=(255,255,255,200), symbolBrush=(0,0,255,150)) plt2.plot(vals, y, pen=None, symbol='o', symbolSize=5, symbolPen=(255,255,255,200), symbolBrush=(0,0,255,150))
## Start Qt event loop unless running in interactive mode or using pyside. ## Start Qt event loop unless running in interactive mode or using pyside.
if __name__ == '__main__': if __name__ == '__main__':

3
pyqtgraph/graphicsItems/PlotDataItem.py
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@ -70,7 +70,8 @@ class PlotDataItem(GraphicsObject):
May be any single argument accepted by :func:`mkBrush() <pyqtgraph.mkBrush>` May be any single argument accepted by :func:`mkBrush() <pyqtgraph.mkBrush>`
stepMode If True, two orthogonal lines are drawn for each sample stepMode If True, two orthogonal lines are drawn for each sample
as steps. This is commonly used when drawing histograms. as steps. This is commonly used when drawing histograms.
Note that in this case, len(x) == len(y) + 1 Note that in this case, `len(x) == len(y) + 1`
(added in version 0.9.9)
========== ============================================================================== ========== ==============================================================================
**Point style keyword arguments:** (see :func:`ScatterPlotItem.setData() <pyqtgraph.ScatterPlotItem.setData>` for more information) **Point style keyword arguments:** (see :func:`ScatterPlotItem.setData() <pyqtgraph.ScatterPlotItem.setData>` for more information)