1# -*- coding: utf-8 -*-
2"""
3Demonstrate use of GLLinePlotItem to draw cross-sections of a surface.
4
5"""
6## Add path to library (just for examples; you do not need this)
7import initExample
8
9import pyqtgraph.opengl as gl
10import pyqtgraph as pg
11import numpy as np
12
13app = pg.mkQApp("GLLinePlotItem Example")
14w = gl.GLViewWidget()
15w.show()
16w.setWindowTitle('pyqtgraph example: GLLinePlotItem')
17w.setCameraPosition(distance=40)
18
19gx = gl.GLGridItem()
20gx.rotate(90, 0, 1, 0)
21gx.translate(-10, 0, 0)
22w.addItem(gx)
23gy = gl.GLGridItem()
24gy.rotate(90, 1, 0, 0)
25gy.translate(0, -10, 0)
26w.addItem(gy)
27gz = gl.GLGridItem()
28gz.translate(0, 0, -10)
29w.addItem(gz)
30
31n = 51
32y = np.linspace(-10,10,n)
33x = np.linspace(-10,10,100)
34for i in range(n):
35    yi = y[i]
36    d = np.hypot(x, yi)
37    z = 10 * np.cos(d) / (d+1)
38    pts = np.column_stack([x, np.full_like(x, yi), z])
39    plt = gl.GLLinePlotItem(pos=pts, color=pg.mkColor((i,n*1.3)), width=(i+1)/10., antialias=True)
40    w.addItem(plt)
41
42if __name__ == '__main__':
43    pg.exec()
44