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"""
Demonstrate use of GLLinePlotItem to draw cross-sections of a surface.
"""
import sys
import numpy as np
import pyqtgraph as pg
from pyqtgraph.Qt import QtGui
import pyqtgraph.opengl as gl
if 'darwin' in sys.platform:
fmt = QtGui.QSurfaceFormat()
fmt.setRenderableType(fmt.RenderableType.OpenGL)
fmt.setProfile(fmt.OpenGLContextProfile.CoreProfile)
fmt.setVersion(4, 1)
QtGui.QSurfaceFormat.setDefaultFormat(fmt)
app = pg.mkQApp("GLLinePlotItem Example")
w = gl.GLViewWidget()
w.show()
w.setWindowTitle('pyqtgraph example: GLLinePlotItem')
w.setCameraPosition(distance=40)
gx = gl.GLGridItem()
gx.rotate(90, 0, 1, 0)
gx.translate(-10, 0, 0)
w.addItem(gx)
gy = gl.GLGridItem()
gy.rotate(90, 1, 0, 0)
gy.translate(0, -10, 0)
w.addItem(gy)
gz = gl.GLGridItem()
gz.translate(0, 0, -10)
w.addItem(gz)
n = 51
y = np.linspace(-10,10,n)
x = np.linspace(-10,10,100)
for i in range(n):
yi = y[i]
d = np.hypot(x, yi)
z = 10 * np.cos(d) / (d+1)
pts = np.column_stack([x, np.full_like(x, yi), z])
plt = gl.GLLinePlotItem(pos=pts, color=pg.mkColor((i,n*1.3)), width=(i+1)/10., antialias=True)
w.addItem(plt)
if __name__ == '__main__':
pg.exec()
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