# Crosshair plug in - one or two vertices?

**URL:** <https://forum.commonvisionblox.com/t/crosshair-plug-in-one-or-two-vertices/39>\
**Category:** C-style API\
**Tags:** display, activex, overlayplugin, crosshair\
**Created:** [May 9, 2017, 9:38am UTC](https://forum.commonvisionblox.com/t/crosshair-plug-in-one-or-two-vertices/39 "2017-05-09T09:38:58Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![taserface](https://avatars.discourse-cdn.com/v4/letter/t/22d042/32.png) [@taserface](https://forum.commonvisionblox.com/u/taserface)\
**Post date:** [May 9, 2017, 9:38am UTC](https://forum.commonvisionblox.com/t/crosshair-plug-in-one-or-two-vertices/39/1 "2017-05-09T09:38:58Z")

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When creating a crosshair plug in I need two vertices. But `axCVDisplay1.GetOverlayObjectPosition` always returns coordinate (0, 0) for the second vertex 😕

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**Author:** ![illusive](https://yyz1.discourse-cdn.com/flex027/user_avatar/forum.commonvisionblox.com/illusive/32/61_2.png) [@illusive](https://forum.commonvisionblox.com/u/illusive)\
**Post date:** [May 9, 2017, 9:47am UTC](https://forum.commonvisionblox.com/t/crosshair-plug-in-one-or-two-vertices/39/2 "2017-05-09T09:47:47Z")

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This is correct. Although the Crosshair plugin requires two vertices for its definition (one for position and one defining the size of the two bars of the cross) it uses only one vertex for interaction with the user. Changing or querying the bar size _after_ the plugin has been created is not supported.