pyqtgraph/examples/pColorMeshItem.py

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# -*- coding: utf-8 -*-
"""
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Demonstrates very basic use of PColorMeshItem
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"""
## Add path to library (just for examples; you do not need this)
import initExample
from pyqtgraph.Qt import QtCore, QtGui
import numpy as np
import pyqtgraph as pg
import pyqtgraph.ptime as ptime
app = QtGui.QApplication([])
## Create window with GraphicsView widget
win = pg.GraphicsLayoutWidget()
win.show() ## show widget alone in its own window
win.setWindowTitle('pyqtgraph example: pColorMeshItem')
view = win.addViewBox()
## Create data
# To enhance the non-grid meshing, we randomize the polygon vertices per and
# certain amount
randomness = 5
# x and y being the vertices of the polygons, they share the same shape
# However the shape can be different in both dimension
xn = 50 # nb points along x
yn = 40 # nb points along y
x = np.repeat(np.arange(1, xn+1), yn).reshape(xn, yn)\
+ np.random.random((xn, yn))*randomness
y = np.tile(np.arange(1, yn+1), xn).reshape(xn, yn)\
+ np.random.random((xn, yn))*randomness
x.sort(axis=0)
y.sort(axis=0)
# z being the color of the polygons its shape must be decreased by one in each dimension
z = np.exp(-(x*xn)**2/1000)[:-1,:-1]
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## Create image item
edgecolors = None
# edgecolors = {'color':'w', 'width':2} # May be uncommened to see edgecolor effect
pcmi = pg.PColorMeshItem(edgecolors=edgecolors)
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view.addItem(pcmi)
## Set the animation
fps = 25 # Frame per second of the animation
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# Wave parameters
wave_amplitude = 3
wave_speed = 0.3
wave_length = 10
color_speed = 0.3
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i=0
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def updateData():
global i
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## Display the new data set
new_x = x
new_y = y+wave_amplitude*np.cos(x/wave_length+i)
new_z = np.exp(-(x-np.cos(i*color_speed)*xn)**2/1000)[:-1,:-1]
pcmi.setData(new_x,
new_y,
new_z)
i += wave_speed
QtCore.QTimer.singleShot(1000/fps, updateData)
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updateData()
## Start Qt event loop unless running in interactive mode.
if __name__ == '__main__':
import sys
if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
QtGui.QApplication.instance().exec_()