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import math
import numpy as np
from .. import functions as fn
from .. import mkBrush, mkPen
from ..colormap import ColorMap
from ..Qt import QtCore, QtGui
from .GraphicsObject import GraphicsObject
__all__ = ['NonUniformImage']
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())
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