# Connect different points with curved line **URL:** \ **Category:** WinForms\ **Created:** [April 5, 2017, 7:04am UTC](https://community.thinkgeo.com/t/connect-different-points-with-curved-line/8493 "2017-04-05T07:04:49Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![ashok\_pydi](https://community.thinkgeo.com/letter_avatar_proxy/v4/letter/a/2acd7d/32.png) [@ashok\_pydi](https://community.thinkgeo.com/u/ashok_pydi)\ **Post date:** [April 5, 2017, 7:04am UTC](https://community.thinkgeo.com/t/connect-different-points-with-curved-line/8493/1 "2017-04-05T07:04:49Z")
Hi I am working on an application which displays Weather Jetstream. In that I am connecting a group of points together and displaying winds on top it. Here my requirement is I wanted to show connected points as a Curved line. But I am able to draw only straight lines. Please look at following image for ref. Right now i am getting like this ![](https://community.thinkgeo.com/uploads/default/original/3X/3/5/3527255fc22ced3481f3bafb4532f0778bf286f1.png) But, I need like this.. . ![](https://community.thinkgeo.com/uploads/default/original/3X/3/f/3fa9be5bcd8b5fef2ed3e392a0e09b719278a190.jpg) I think it is called as **cubic spline**. Please provide me is there any code available. Or guide me how to do it. Thanks Ashok ---
**Author:** ![Ethan](https://community.thinkgeo.com/user_avatar/community.thinkgeo.com/ethan/32/19964_2.png) [@Ethan](https://community.thinkgeo.com/u/Ethan)\ **Post date:** [April 6, 2017, 3:38am UTC](https://community.thinkgeo.com/t/connect-different-points-with-curved-line/8493/2 "2017-04-06T03:38:33Z")
Hi Ashok, I think this topic as below should be helpful. > [@Draw curve line issue](http://community.thinkgeo.com/t/draw-curve-line-issue/2488): > > Hi,     I want to draw curve line. I have from -to point, radius in Nautical mile, center point. I have tried with draw arc sample but it did not work for me. Please suggest how to draw curve line using all these parameters. Thanks, Goral      Regards, Don ---
**Author:** ![ashok\_pydi](https://community.thinkgeo.com/letter_avatar_proxy/v4/letter/a/2acd7d/32.png) [@ashok\_pydi](https://community.thinkgeo.com/u/ashok_pydi)\ **Post date:** [April 6, 2017, 4:09am UTC](https://community.thinkgeo.com/t/connect-different-points-with-curved-line/8493/3 "2017-04-06T04:09:26Z")
Hi Don, Thanks for your reply… It looks like the above given post is just for drawing an arc or curve based on some angle/radius. But I want to connect the points just like how they are directing to… I didn’t mean exactly curved. I mean to say i wanted to join the points but it should not be straight lines. it should have some smoothning as I shown in above pencil diagram. Thank you… Ashok ---
**Author:** ![Emil](https://community.thinkgeo.com/user_avatar/community.thinkgeo.com/emil/32/19043_2.png) [@Emil](https://community.thinkgeo.com/u/Emil)\ **Post date:** [April 6, 2017, 10:09am UTC](https://community.thinkgeo.com/t/connect-different-points-with-curved-line/8493/4 "2017-04-06T10:09:32Z")
Hi Ashok, Currently, we have no sample for that. I find a sample for Cubic Spline Interpolation, please refer to [https://www.codeproject.com/articles/560163/csharp-cubic-spline-interpolation](https://www.codeproject.com/articles/560163/csharp-cubic-spline-interpolation) . it seems to be what we want. 1. we learn this sample to create a interpolation logic to make the line more smooth. 2. Then we will create a customstyle inherit from LineStyle, and use the logic from 1 to get smooth line then draw it. here is a sample shows create a customstyle: [http://wiki.thinkgeo.com/wiki/source\_code\_wpfdesktopeditionsample\_multilinelabeling\_cs\_110316.zip](http://wiki.thinkgeo.com/wiki/source_code_wpfdesktopeditionsample_multilinelabeling_cs_110316.zip) I guess a point we need to pay attention to here: the projection. here is a sample shows that [http://wiki.thinkgeo.com/wiki/map\_suite\_wpf\_desktop\_edition\_all\_samples#great\_circle\_with\_google\_map](http://wiki.thinkgeo.com/wiki/map_suite_wpf_desktop_edition_all_samples#great_circle_with_google_map) I think we need draw the line as above sample. because the position of any point on the line is match the position on the earth, at the same time i think the line is the shortest path between two point on the earth.I don’t know what projection you use, above is for reference only. Thanks, Emil ---
**Author:** ![ashok\_pydi](https://community.thinkgeo.com/letter_avatar_proxy/v4/letter/a/2acd7d/32.png) [@ashok\_pydi](https://community.thinkgeo.com/u/ashok_pydi)\ **Post date:** [April 13, 2017, 5:08am UTC](https://community.thinkgeo.com/t/connect-different-points-with-curved-line/8493/5 "2017-04-13T05:08:04Z")
Hi Emil, Thanks for your great post. I have tried Cubic Spline Interpolation example which you posted above… Its working out well… Thank you once again – Ashok ---
**Author:** ![Emil](https://community.thinkgeo.com/user_avatar/community.thinkgeo.com/emil/32/19043_2.png) [@Emil](https://community.thinkgeo.com/u/Emil)\ **Post date:** [April 13, 2017, 7:14am UTC](https://community.thinkgeo.com/t/connect-different-points-with-curved-line/8493/6 "2017-04-13T07:14:58Z")
Hi Ashok, I am glad to hear that works. Any question please let us know. Thanks Emil