feat: add dottedSpacingFactor to customize dotted polyline spacing

[gnassro]

Now we can customize the space between dots if isDotted=true

[josxha]

Thanks for the pull request @gnassro!
I did a quick test and your changes seem to work well.

There are some small things I would prefer to have changed:

• We have an open feature request for dashed polylines. So it wood be good to have the name a bit more general like "segmentSpacingFactor" or somthing similar. Then we can use the parameter for dashed polyine too once the feature arrives.
• The CI checks show that the code is not formatted, you can do this with dart format ., but if you have difficulties I can do it for you if you want. (edit: a trailing comma at the constructor parameters should work too)

Then there are some general things I discovered while testing that you don't need to care about but are worth writing down:

• changing isDotted doesn't get picked up by hot reload
• It would be in general nice to have the dotted Polyline features represented in the example app, but I think that putting all on the polyline page would look cluttered.

[gnassro]

@josxha the only thing that I didn't understand is, what do you mean by changing isDotted doesn't get picked up by hot reload ?

[JaffaKetchup]

LGTM, thanks :). Will wait for a second review before merging.

[josxha]

Sorry for the delay, changes looking good. Thanks for updating the example app too.

the only thing that I didn't understand is, what do you mean by changing isDotted doesn't get picked up by hot reload ?

This is a bug that is not related to this pull request. If you

• run the app in debug mode
• change isDotted: true, to isDotted: false,
• trigger a hot reload

Then the polyline doesn't change it's appearance from a dotted to a normal line. A quick guess is because the polyline hashCode gets cached it doesn't regocnizes the change - but anyways as said it's not related to this pr.

Thanks a lot for the contribution!