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