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"""
Tests use of IsoCurve item displayed with image
"""
import numpy as np
import pyqtgraph as pg
from pyqtgraph.Qt import QtCore
app = pg.mkQApp("Isocurve Example")
## make pretty looping data
frames = 200
data = np.random.normal(size=(frames,30,30), loc=0, scale=100)
data = np.concatenate([data, data], axis=0)
data = pg.gaussianFilter(data, (10, 10, 10))[frames//2:frames + frames//2]
data[:, 15:16, 15:17] += 1
win = pg.GraphicsLayoutWidget(show=True)
win.setWindowTitle('pyqtgraph example: Isocurve')
vb = win.addViewBox()
img = pg.ImageItem(data[0])
vb.addItem(img)
vb.setAspectLocked()
## generate empty curves
curves = []
levels = np.linspace(data.min(), data.max(), 10)
for i in range(len(levels)):
v = levels[i]
## generate isocurve with automatic color selection
c = pg.IsocurveItem(level=v, pen=(i, len(levels)*1.5))
c.setParentItem(img) ## make sure isocurve is always correctly displayed over image
c.setZValue(10)
curves.append(c)
## animate!
ptr = 0
imgLevels = (data.min(), data.max() * 2)
def update():
global data, curves, img, ptr, imgLevels
ptr = (ptr + 1) % data.shape[0]
data[ptr]
img.setImage(data[ptr], levels=imgLevels)
for c in curves:
c.setData(data[ptr])
timer = QtCore.QTimer()
timer.timeout.connect(update)
timer.start(50)
if __name__ == '__main__':
pg.exec()
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