101 lines
2.8 KiB
Python
101 lines
2.8 KiB
Python
# -*- coding: utf-8 -*-
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"""
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This example demonstrates the use of GLSurfacePlotItem.
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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 sys, os
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sys.path.insert(0, os.path.join(os.path.dirname(__file__), '..', '..'))
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from pyqtgraph.Qt import QtCore, QtGui
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import pyqtgraph as pg
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import pyqtgraph.opengl as gl
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import scipy.ndimage as ndi
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import numpy as np
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## Create a GL View widget to display data
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app = QtGui.QApplication([])
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w = gl.GLViewWidget()
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w.show()
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w.setCameraPosition(distance=50)
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## Add a grid to the view
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g = gl.GLGridItem()
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g.scale(2,2,1)
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g.setDepthValue(10) # draw grid after surfaces since they may be translucent
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w.addItem(g)
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## Simple surface plot example
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## x, y values are not specified, so assumed to be 0:50
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z = ndi.gaussian_filter(np.random.normal(size=(50,50)), (1,1))
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p1 = gl.GLSurfacePlotItem(z=z, shader='shaded', color=(0.5, 0.5, 1, 1))
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p1.scale(16./49., 16./49., 1.0)
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p1.translate(-18, 2, 0)
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w.addItem(p1)
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## Saddle example with x and y specified
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x = np.linspace(-8, 8, 50)
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y = np.linspace(-8, 8, 50)
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z = 0.1 * ((x.reshape(50,1) ** 2) - (y.reshape(1,50) ** 2))
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p2 = gl.GLSurfacePlotItem(x=x, y=y, z=z, shader='normalColor')
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p2.translate(-10,-10,0)
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w.addItem(p2)
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## Manually specified colors
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z = ndi.gaussian_filter(np.random.normal(size=(50,50)), (1,1))
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x = np.linspace(-12, 12, 50)
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y = np.linspace(-12, 12, 50)
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colors = np.ones((50,50,4), dtype=float)
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colors[...,0] = np.clip(np.cos(((x.reshape(50,1) ** 2) + (y.reshape(1,50) ** 2)) ** 0.5), 0, 1)
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colors[...,1] = colors[...,0]
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p3 = gl.GLSurfacePlotItem(z=z, colors=colors.reshape(50*50,4), shader='shaded', smooth=False)
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p3.scale(16./49., 16./49., 1.0)
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p3.translate(2, -18, 0)
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w.addItem(p3)
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## Animated example
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## compute surface vertex data
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cols = 100
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rows = 100
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x = np.linspace(-8, 8, cols+1).reshape(cols+1,1)
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y = np.linspace(-8, 8, rows+1).reshape(1,rows+1)
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d = (x**2 + y**2) * 0.1
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d2 = d ** 0.5 + 0.1
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## precompute height values for all frames
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phi = np.arange(0, np.pi*2, np.pi/20.)
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z = np.sin(d[np.newaxis,...] + phi.reshape(phi.shape[0], 1, 1)) / d2[np.newaxis,...]
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## create a surface plot, tell it to use the 'heightColor' shader
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## since this does not require normal vectors to render (thus we
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## can set computeNormals=False to save time when the mesh updates)
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p4 = gl.GLSurfacePlotItem(x=x[:,0], y = y[0,:], shader='heightColor', computeNormals=False, smooth=False)
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p4.shader()['colorMap'] = np.array([0.2, 2, 0.5, 0.2, 1, 1, 0.2, 0, 2])
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p4.translate(10, 10, 0)
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w.addItem(p4)
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index = 0
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def update():
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global p4, z, index
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index -= 1
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p4.setData(z=z[index%z.shape[0]])
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timer = QtCore.QTimer()
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timer.timeout.connect(update)
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timer.start(30)
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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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