# Calculated pens

**URL:** <https://forum.inductiveautomation.com/t/calculated-pens/9037>\
**Category:** Ignition\
**Created:** [September 10, 2014, 2:21pm UTC](https://forum.inductiveautomation.com/t/calculated-pens/9037 "2014-09-10T14:21:55Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![AJBerera](https://avatars.discourse-cdn.com/v4/letter/a/9fc29f/32.png) [@AJBerera](https://forum.inductiveautomation.com/u/AJBerera)\
**Post date:** [September 10, 2014, 2:21pm UTC](https://forum.inductiveautomation.com/t/calculated-pens/9037/1 "2014-09-10T14:21:55Z")

</div>

I’m using version 7.6.6

I’ve tried several times to create a calculated pen for Ave or Moving Ave of one of my db pens. once I click OK on the Easy Chart setup, the designer closes. Is this a known bug, or am I trying to use this feature incorrectly?  
All I want is to do line smoothing on some of my db pens.

---

<div class="post-metadata">

**Author:** ![JordanCClark](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/jordancclark/32/83362_2.png) [@JordanCClark](https://forum.inductiveautomation.com/u/JordanCClark)\
**Post date:** [September 10, 2014, 7:02pm UTC](https://forum.inductiveautomation.com/t/calculated-pens/9037/2 "2014-09-10T19:02:49Z")

</div>

You can try uninstalling the designer and restarting-- note: this gets rid of whatever other cached sessions and icons you might have as well.

```auto
javaws.exe -uninstall 
```

---

<div class="post-metadata">

**Author:** ![james.hunt](https://avatars.discourse-cdn.com/v4/letter/j/fbc32d/32.png) [@james.hunt](https://forum.inductiveautomation.com/u/james.hunt)\
**Post date:** [September 29, 2014, 2:12pm UTC](https://forum.inductiveautomation.com/t/calculated-pens/9037/3 "2014-09-29T14:12:30Z")

</div>

What version of Java are you currently running? Also when this happens do you see any errors in the Gateway Console in regards to the designer?