87 lines
2.1 KiB
Python
87 lines
2.1 KiB
Python
# -*- coding: utf-8 -*-
|
|
"""
|
|
Demonstrates very basic use of PColorMeshItem
|
|
"""
|
|
|
|
## Add path to library (just for examples; you do not need this)
|
|
import initExample
|
|
|
|
from pyqtgraph.Qt import QtCore
|
|
import numpy as np
|
|
import pyqtgraph as pg
|
|
|
|
app = pg.mkQApp("PColorMesh Example")
|
|
|
|
## 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]
|
|
|
|
## Create image item
|
|
edgecolors = None
|
|
antialiasing = False
|
|
# edgecolors = {'color':'w', 'width':2} # May be uncommened to see edgecolor effect
|
|
# antialiasing = True # May be uncommened to see antialiasing effect
|
|
pcmi = pg.PColorMeshItem(edgecolors=edgecolors, antialiasing=antialiasing)
|
|
view.addItem(pcmi)
|
|
|
|
|
|
## Set the animation
|
|
fps = 25 # Frame per second of the animation
|
|
|
|
# Wave parameters
|
|
wave_amplitude = 3
|
|
wave_speed = 0.3
|
|
wave_length = 10
|
|
color_speed = 0.3
|
|
|
|
timer = QtCore.QTimer()
|
|
timer.setSingleShot(True)
|
|
# not using QTimer.singleShot() because of persistence on PyQt. see PR #1605
|
|
|
|
i=0
|
|
def updateData():
|
|
global i
|
|
|
|
## 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
|
|
timer.start(1000//fps)
|
|
|
|
timer.timeout.connect(updateData)
|
|
updateData()
|
|
|
|
if __name__ == '__main__':
|
|
pg.exec()
|