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"""
Streamplot
----------
Generating a vector-based streamplot.
"""
__tags__ = ['Vector data']
import matplotlib.pyplot as plt
import cartopy.crs as ccrs
from cartopy.examples.arrows import sample_data
def main():
fig = plt.figure(figsize=(10, 5))
ax = fig.add_subplot(1, 1, 1, projection=ccrs.PlateCarree())
ax.set_extent([-90, 75, 10, 85], crs=ccrs.PlateCarree())
ax.coastlines()
x, y, u, v, vector_crs = sample_data(shape=(80, 100))
magnitude = (u ** 2 + v ** 2) ** 0.5
ax.streamplot(x, y, u, v, transform=vector_crs,
linewidth=2, density=2, color=magnitude)
plt.show()
if __name__ == '__main__':
main()
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