Fixed database typo and removed unnecessary class identifier.

venv/Lib/site-packages/skimage/viewer/plugins/measure.py

@@ -0,0 +1,49 @@
+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
+        self.line_tool = LineTool(self.image_viewer,
+                                  maxdist=self.maxdist,
+                                  on_move=self.line_changed)
+        self.artists.append(self.line_tool)
+
+    def help(self):
+        helpstr = ("Measure tool",
+                   "Select line to measure distance and angle.")
+        return '\n'.join(helpstr)
+
+    def line_changed(self, end_points):
+        x, y = np.transpose(end_points)
+        dx = np.diff(x)[0]
+        dy = np.diff(y)[0]
+        self._length.text = '%.1f' % np.hypot(dx, dy)
+        self._angle.text = '%.1f°' % (180 - np.arctan2(dy, dx) * rad2deg)