old_contents: # -*- coding: utf-8 -*-
  import numpy as np
  
  from .base import Plugin
  from ..widgets import Text
  from ..canvastools import LineTool
  
  
  __all__ = ['Measure']
  
  
  rad2deg = 180 / np.pi
  
  
  class Measure(Plugin):
      name = 'Measure'
  
      def __init__(self, maxdist=10, **kwargs):
          super(Measure, self).__init__(**kwargs)
  
          self.maxdist = maxdist
          self._length = Text('Length:')
          self._angle = Text('Angle:')
  
          self.add_widget(self._length)
          self.add_widget(self._angle)
  
          print self.help()
  
      def attach(self, image_viewer):
          super(Measure, self).attach(image_viewer)
  
          image = image_viewer.original_image
          h, w = image.shape
          x = [w / 3, 2 * w / 3]
          y = [h / 2] * 2
          self.line_tool = LineTool(self.image_viewer.ax, x, y,
                                    maxdist=self.maxdist,
                                    on_move=self.line_changed)
          # initialize displayed values
          self.line_changed(np.transpose((x, y)))
  
      def help(self):
          helpstr = ("Line profile tool",
                     "Select line to measure distance and angle.")
          return '\n'.join(helpstr)
  
      def line_changed(self, end_pts):
          x, y = np.transpose(end_pts)
          dx = np.diff(x)[0]
          dy = np.diff(y)[0]
          self._length.text = '%.1f' % np.hypot(dx, dy)
          self._angle.text = u'%.1f°' % (180 - np.arctan2(dy, dx) * rad2deg)
  
new_contents: # -*- coding: utf-8 -*-
  import numpy as np
  
  from .base import Plugin
  from ..widgets import Text
  from ..canvastools import LineTool
  
  
  __all__ = ['Measure']
  
  
  rad2deg = 180 / np.pi
  
  
  class Measure(Plugin):
      name = 'Measure'
  
      def __init__(self, maxdist=10, **kwargs):
          super(Measure, self).__init__(**kwargs)
  
          self.maxdist = maxdist
          self._length = Text('Length:')
          self._angle = Text('Angle:')
  
          self.add_widget(self._length)
          self.add_widget(self._angle)
  
          print self.help()
  
      def attach(self, image_viewer):
          super(Measure, self).attach(image_viewer)
  
          image = image_viewer.original_image
          h, w = image.shape
          x = [w / 3, 2 * w / 3]
          y = [h / 2] * 2
          self.line_tool = LineTool(self.image_viewer.ax, x, y,
                                    maxdist=self.maxdist,
                                    on_move=self.line_changed)
          # initialize displayed values
          self.line_changed(np.transpose((x, y)))
  
      def help(self):
          helpstr = ("Measure tool",
                     "Select line to measure distance and angle.")
          return '\n'.join(helpstr)
  
      def line_changed(self, end_pts):
          x, y = np.transpose(end_pts)
          dx = np.diff(x)[0]
          dy = np.diff(y)[0]
          self._length.text = '%.1f' % np.hypot(dx, dy)
          self._angle.text = u'%.1f°' % (180 - np.arctan2(dy, dx) * rad2deg)
  
subject: Fix typo