50 lines
1.3 KiB
Python
50 lines
1.3 KiB
Python
import numpy as np
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from .base import Plugin
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from ..widgets import Text
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from ..canvastools import LineTool
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__all__ = ['Measure']
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rad2deg = 180 / np.pi
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class Measure(Plugin):
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name = 'Measure'
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def __init__(self, maxdist=10, **kwargs):
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super(Measure, self).__init__(**kwargs)
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self.maxdist = maxdist
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self._length = Text('Length:')
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self._angle = Text('Angle:')
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self.add_widget(self._length)
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self.add_widget(self._angle)
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print(self.help())
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def attach(self, image_viewer):
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super(Measure, self).attach(image_viewer)
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image = image_viewer.original_image
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h, w = image.shape
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self.line_tool = LineTool(self.image_viewer,
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maxdist=self.maxdist,
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on_move=self.line_changed)
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self.artists.append(self.line_tool)
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def help(self):
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helpstr = ("Measure tool",
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"Select line to measure distance and angle.")
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return '\n'.join(helpstr)
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def line_changed(self, end_points):
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x, y = np.transpose(end_points)
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dx = np.diff(x)[0]
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dy = np.diff(y)[0]
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self._length.text = '%.1f' % np.hypot(dx, dy)
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self._angle.text = '%.1f°' % (180 - np.arctan2(dy, dx) * rad2deg)
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