Connect different points with curved line

ThinkGeo UI for Desktop WinForms
1

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

Untitled.png840×381 20 KB

But, I need like this.. .

IMG_20170405_105158642.jpg2204×972 196 KB

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

2

Hi Ashok,

I think this topic as below should be helpful.

Regards,

Don

3

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

4

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 . 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

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
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

5

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

6

Hi Ashok,

I am glad to hear that works.

Any question please let us know.

Thanks
Emil