mapPlot function will produce error caused by gpclibPermitStatus() if lacking certain packages

[liuyanguu]

https://github.com/bryandmartin/SUMMER/blob/cd53e5d8d549434ea2b29cba9b0fbfa957fc8a98/R/mapPlot.R#L100

Error message: Error in maptools::unionSpatialPolygons: isTRUE(gpclibPermitStatus()) is not TRUE

Solved by installing gpclib from source according to this discussion

if (!require(gpclib)) install.packages("gpclib", type="source")

or maybe by just installing rgeos according to the same discussion.
Somehow it seems mapproj is also required somewhere in the mapPlot.

(Discoverd these when playing with packrat to pack the SUMMER app)
Great package,
Thank you. :)

[richardli]

Thank you! I'll experiment if I can add rgeos in dependencies in the future update.

[liuyanguu]

I might be wrong, but it seems I need to load both mapproj and gpclib. Just FYI.
On maptool's cran it says it "enhanced" gpclib. Not sure what that means.