def labelLine()

in reproduce/label_lines.py [0:0]

• 43 lines of code
• 16 McCabe index (conditional complexity)

def labelLine(line,x,label=None,align=True,**kwargs):

    ax = line.axes
    xdata = line.get_xdata()
    ydata = line.get_ydata()

    if (x < xdata[0]) or (x > xdata[-1]):
        print('x label location is outside data range!')
        return

    #Find corresponding y co-ordinate and angle of the line
    ip = 1
    for i in range(len(xdata)):
        if x < xdata[i]:
            ip = i
            break

    y = ydata[ip-1] + (ydata[ip]-ydata[ip-1])*(x-xdata[ip-1])/(xdata[ip]-xdata[ip-1])

    if not label:
        label = line.get_label()

    if align:
        #Compute the slope
        dx = xdata[ip] - xdata[ip-1]
        dy = ydata[ip] - ydata[ip-1]
        ang = degrees(atan2(dy,dx))

        #Transform to screen co-ordinates
        pt = np.array([x,y]).reshape((1,2))
        trans_angle = ax.transData.transform_angles(np.array((ang,)),pt)[0]

    else:
        trans_angle = 0

    #Set a bunch of keyword arguments
    if 'color' not in kwargs:
        kwargs['color'] = line.get_color()

    if ('horizontalalignment' not in kwargs) and ('ha' not in kwargs):
        kwargs['ha'] = 'center'

    if ('verticalalignment' not in kwargs) and ('va' not in kwargs):
        kwargs['va'] = 'center'

    if 'backgroundcolor' not in kwargs:
        kwargs['backgroundcolor'] = ax.get_facecolor()

    if 'clip_on' not in kwargs:
        kwargs['clip_on'] = True

    if 'zorder' not in kwargs:
        kwargs['zorder'] = 2.5

    # Add box with rounded corners around the label
    kwargs["bbox"] = dict(
        fill=True,
        facecolor=kwargs['backgroundcolor'],
        edgecolor=kwargs["color"],
        #linestyle="solid",
        linewidth=0.3, #None is default
        boxstyle="round,rounding_size=0.5,pad=0.15"
    )

    ax.text(x,y,label,rotation=trans_angle,**kwargs)