"""
PyQtGraph Example
=================

Basic PyQtGraph example.
"""

from qtpy import QtWidgets
import numpy as np
import pyqtgraph as pg
import pyqtgraph.opengl as gl

# %%
# Usually the first thing is to create a ``QApplication`` instance.  Some
# high-level functions do this for you, but you'll typically need to get the
# application instance in order to call ``exec_()`` at the end of your script
# anyway.

app = pg.mkQApp()

# %%
# A high-level plot call:

pg.plot([1, 2, 3, 4, 5], [1, 4, 9, 16, 25])

# %%
# OpenGL examples won't generally work with a headless X server unfortunately:

w = gl.GLViewWidget()
g = gl.GLGridItem()
data = np.array([[0, 0, 0], [1, 0, 0], [1, 0, 1], [0, 0, 2]])
sp = gl.GLScatterPlotItem(pos=data, color=(1, 1, 1, 1), size=10)

w.addItem(g)
w.addItem(sp)
w.show()

# %%

app.exec_()