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create double parallel line using lineannotation, when the line draged, the other line stay parallel.

Version
wpf 4.2
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Try this

  1. Create one LineAnnotation, Bind to ViewModel X1,X2,Y1,Y2
  2. Create a second LineAnnotation, Bind to ViewModel X11,X22,Y11,Y22
  3. When X11 or X22 or Y11 or Y22 changed, update X1, X2, Y1, Y2
  4. When X1, X2, Y1, Y2 changed, update X11, X22, Y11, Y22

Best regards,
Andrew

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