def test_arrow_projection_list(wind_projection_list):
"""Test that arrows will be projected when lat/lon lists are provided."""
lat, lon, u, v = wind_projection_list
fig = plt.figure()
ax = fig.add_subplot(1, 1, 1)
stnplot = StationPlot(ax, lon, lat)
stnplot.plot_arrow(u, v)
assert stnplot.arrows
def test_arrow_unit_conversion(barbs_units):
"""Test that arrow units can be converted at plot time (#737)."""
x_pos, y_pos, u_wind, v_wind = barbs_units
fig = plt.figure()
ax = fig.add_subplot(1, 1, 1)
stnplot = StationPlot(ax, x_pos, y_pos)
stnplot.plot_arrow(u_wind, v_wind, plot_units='knots')
ax.set_xlim(-5, 5)
ax.set_ylim(-5, 5)
return fig
def test_arrow_projection(wind_plot, ccrs):
"""Test that arrows are properly projected."""
u, v, x, y = wind_plot
# Plot and check barbs (they should align with grid lines)
fig = plt.figure()
ax = fig.add_subplot(1, 1, 1, projection=ccrs.LambertConformal())
ax.gridlines(xlocs=[-120, -105, -90, -75, -60], ylocs=np.arange(24, 55, 6))
sp = StationPlot(ax, x, y, transform=ccrs.PlateCarree())
sp.plot_arrow(u, v)
sp.plot_arrow(u, v) # plot_arrow used twice to hit removal if statement
return fig