pyqtgraph/pyqtgraph/graphicsItems/NonUniformImage.py
Ogi Moore 314121192a Use math module for isfinite or isnan for scalars
Various places in the library attempt to check if scalars are finite
via numpy methods, which are intended to be used on numpy arrays.  Using
the math module equivalent functions on scalars is significantly faster.

In a few places, I also use numpy methods explicitly (np.all vs. all)
2021-04-23 22:43:57 -07:00

132 lines
3.9 KiB
Python

from ..Qt import QtGui, QtCore
import math
import numpy as np
from ..colormap import ColorMap
from .GraphicsObject import GraphicsObject
from .. import mkBrush, mkPen
from .. import functions as fn
class NonUniformImage(GraphicsObject):
"""
**Bases:** :class:`GraphicsObject <pyqtgraph.GraphicsObject>`
GraphicsObject displaying an image with non-uniform sample points. It's
commonly used to display 2-d or slices of higher dimensional data that
have a regular but non-uniform grid e.g. measurements or simulation results.
"""
def __init__(self, x, y, z, border=None):
GraphicsObject.__init__(self)
# convert to numpy arrays
x = np.asarray(x, dtype=np.float64)
y = np.asarray(y, dtype=np.float64)
z = np.asarray(z, dtype=np.float64)
if x.ndim != 1 or y.ndim != 1:
raise Exception("x and y must be 1-d arrays.")
if np.any(np.diff(x) < 0) or np.any(np.diff(y) < 0):
raise Exception("The values in x and y must be monotonically increasing.")
if len(z.shape) != 2 or z.shape != (x.size, y.size):
raise Exception("The length of x and y must match the shape of z.")
# default colormap (black - white)
self.cmap = ColorMap(pos=[0.0, 1.0], color=[(0.0, 0.0, 0.0, 1.0), (1.0, 1.0, 1.0, 1.0)])
self.data = (x, y, z)
self.lut = None
self.border = border
self.generatePicture()
def setLookupTable(self, lut, autoLevel=False):
lut.sigLevelsChanged.connect(self.generatePicture)
lut.gradient.sigGradientChanged.connect(self.generatePicture)
self.lut = lut
if autoLevel:
_, _, z = self.data
f = z[np.isfinite(z)]
lut.setLevels(f.min(), f.max())
self.generatePicture()
def setColorMap(self, cmap):
self.cmap = cmap
self.generatePicture()
def getHistogram(self, **kwds):
"""Returns x and y arrays containing the histogram values for the current image.
For an explanation of the return format, see numpy.histogram().
"""
z = self.data[2]
z = z[np.isfinite(z)]
hist = np.histogram(z, **kwds)
return hist[1][:-1], hist[0]
def generatePicture(self):
x, y, z = self.data
self.picture = QtGui.QPicture()
p = QtGui.QPainter(self.picture)
p.setPen(mkPen(None))
# normalize
if self.lut is not None:
mn, mx = self.lut.getLevels()
else:
f = z[np.isfinite(z)]
mn = f.min()
mx = f.max()
# draw the tiles
for i in range(x.size):
for j in range(y.size):
value = z[i, j]
if np.isneginf(value):
value = 0.0
elif np.isposinf(value):
value = 1.0
elif math.isnan(value):
continue # ignore NaN
else:
value = (value - mn) / (mx - mn) # normalize
if self.lut:
color = self.lut.gradient.getColor(value)
else:
color = self.cmap.mapToQColor(value)
p.setBrush(mkBrush(color))
# left, right, bottom, top
l = x[0] if i == 0 else (x[i - 1] + x[i]) / 2
r = (x[i] + x[i + 1]) / 2 if i < x.size - 1 else x[-1]
b = y[0] if j == 0 else (y[j - 1] + y[j]) / 2
t = (y[j] + y[j + 1]) / 2 if j < y.size - 1 else y[-1]
p.drawRect(QtCore.QRectF(l, t, r - l, b - t))
if self.border is not None:
p.setPen(self.border)
p.setBrush(fn.mkBrush(None))
p.drawRect(self.boundingRect())
p.end()
self.update()
def paint(self, p, *args):
p.drawPicture(0, 0, self.picture)
def boundingRect(self):
return QtCore.QRectF(self.picture.boundingRect())