# Draw curve through 3 points (not the control point)

**URL:** <https://forum.kirupa.com/t/draw-curve-through-3-points-not-the-control-point/136263>\
**Category:** Uncategorized\
**Created:** [February 3, 2005, 11:56am UTC](https://forum.kirupa.com/t/draw-curve-through-3-points-not-the-control-point/136263 "2005-02-03T11:56:55Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![Jerryscript](https://yyz1.discourse-cdn.com/flex011/user_avatar/forum.kirupa.com/jerryscript/32/451_2.png) [@Jerryscript](https://forum.kirupa.com/u/Jerryscript)\
**Post date:** [February 3, 2005, 11:56am UTC](https://forum.kirupa.com/t/draw-curve-through-3-points-not-the-control-point/136263/1 "2005-02-03T11:56:55Z")

</div>

I’m attempting to make a curve drawing tool a bit easier to use. Rather than drawing a basic curve and then clicking on the control point to change it, I would like the user to be able to click on the curve itself to change it, much as you do in the FlashIDE.

So, given start and end points, and a point on the curve, how do you determine the control point for use with the MX API?  
(I googled this, but found mostly info on cubic rather than quadratic curves)