# Build the elevation chart using the Google Charts API
log.info("Creating elevation profile chart")
chart = SimpleLineChart(600, 300, y_range=[min(elvs), max(elvs)])

# API quirk -  you need 3 lines of data to color
# in the plot so we add a line at the minimum value
# twice.
chart.add_data([min(elvs)]*2)
chart.add_data(elvs)
chart.add_data([min(elvs)]*2)

# Black lines
chart.set_colours(['000000'])

# fill in the elevation area with a hex color
chart.add_fill_range('80C65A', 1, 2)

# Set up labels for the minimum elevation, halfway value, and max value
elv_labels = int(round(min(elvs))), int(min(elvs)+((max(elvs)-min(elvs))/2)), 
                 int(round(max(elvs)))

# Assign the labels to an axis
elv_label = chart.set_axis_labels(Axis.LEFT, elv_labels)

# Label the axis
elv_text = chart.set_axis_labels(Axis.LEFT, ["FEET"])
# Place the label at 30% the distance of the line
chart.set_axis_positions(elv_text, [30])

# Calculate distances between track segments
distances = []
measurements = []
coords = list(zip(lons, lats))
for i in range(len(coords)-1):
    x1, y1 = coords[i]
    x2, y2 = coords[i+1]
    d = haversine(x1, y1, x2, y2)
    distances.append(d)
total = sum(distances)
distances.append(0)
j = -1