/usr/lib/python2.7/dist-packages/pyqtgraph/examples/GLSurfacePlot.py is in python-pyqtgraph 0.9.10-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 | # -*- coding: utf-8 -*-
"""
This example demonstrates the use of GLSurfacePlotItem.
"""
## Add path to library (just for examples; you do not need this)
import initExample
from pyqtgraph.Qt import QtCore, QtGui
import pyqtgraph as pg
import pyqtgraph.opengl as gl
import numpy as np
## Create a GL View widget to display data
app = QtGui.QApplication([])
w = gl.GLViewWidget()
w.show()
w.setWindowTitle('pyqtgraph example: GLSurfacePlot')
w.setCameraPosition(distance=50)
## Add a grid to the view
g = gl.GLGridItem()
g.scale(2,2,1)
g.setDepthValue(10) # draw grid after surfaces since they may be translucent
w.addItem(g)
## Simple surface plot example
## x, y values are not specified, so assumed to be 0:50
z = pg.gaussianFilter(np.random.normal(size=(50,50)), (1,1))
p1 = gl.GLSurfacePlotItem(z=z, shader='shaded', color=(0.5, 0.5, 1, 1))
p1.scale(16./49., 16./49., 1.0)
p1.translate(-18, 2, 0)
w.addItem(p1)
## Saddle example with x and y specified
x = np.linspace(-8, 8, 50)
y = np.linspace(-8, 8, 50)
z = 0.1 * ((x.reshape(50,1) ** 2) - (y.reshape(1,50) ** 2))
p2 = gl.GLSurfacePlotItem(x=x, y=y, z=z, shader='normalColor')
p2.translate(-10,-10,0)
w.addItem(p2)
## Manually specified colors
z = pg.gaussianFilter(np.random.normal(size=(50,50)), (1,1))
x = np.linspace(-12, 12, 50)
y = np.linspace(-12, 12, 50)
colors = np.ones((50,50,4), dtype=float)
colors[...,0] = np.clip(np.cos(((x.reshape(50,1) ** 2) + (y.reshape(1,50) ** 2)) ** 0.5), 0, 1)
colors[...,1] = colors[...,0]
p3 = gl.GLSurfacePlotItem(z=z, colors=colors.reshape(50*50,4), shader='shaded', smooth=False)
p3.scale(16./49., 16./49., 1.0)
p3.translate(2, -18, 0)
w.addItem(p3)
## Animated example
## compute surface vertex data
cols = 90
rows = 100
x = np.linspace(-8, 8, cols+1).reshape(cols+1,1)
y = np.linspace(-8, 8, rows+1).reshape(1,rows+1)
d = (x**2 + y**2) * 0.1
d2 = d ** 0.5 + 0.1
## precompute height values for all frames
phi = np.arange(0, np.pi*2, np.pi/20.)
z = np.sin(d[np.newaxis,...] + phi.reshape(phi.shape[0], 1, 1)) / d2[np.newaxis,...]
## create a surface plot, tell it to use the 'heightColor' shader
## since this does not require normal vectors to render (thus we
## can set computeNormals=False to save time when the mesh updates)
p4 = gl.GLSurfacePlotItem(x=x[:,0], y = y[0,:], shader='heightColor', computeNormals=False, smooth=False)
p4.shader()['colorMap'] = np.array([0.2, 2, 0.5, 0.2, 1, 1, 0.2, 0, 2])
p4.translate(10, 10, 0)
w.addItem(p4)
index = 0
def update():
global p4, z, index
index -= 1
p4.setData(z=z[index%z.shape[0]])
timer = QtCore.QTimer()
timer.timeout.connect(update)
timer.start(30)
## 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_()
|