[R-sig-Geo] plot.polylist polygon plot order

[Roger Bivand]

On Tue, 21 Aug 2007, Didier Leibovici wrote:

> Hi there,
>
> With plot.polylist is there a way of not drawing the "border" or controlling 
> the width of the border in order to diminish the vision of horror when using 
> a smaller colour range  than the number of polygons and when you have quite a 
> lot of polygons in your "shape".

"Horror" is in the eye of the beholder, and can be controlled easily by 
setting the device size to something other than the default.

border="transparent"

lwd= is not passed through in this "deprecated" function - it is for the 
SpatialPolygon class, for which unionSpatialPolygons() is also available.

Hope this helps,

Roger

>
> I am thinking as well of possible merging or fusion of neighbour polygons 
> having the same color which would give an half way solution ... but I don't 
> know the "union" polygon merging polygons function. (which should be standard 
> I suppose ...)
>
> thanks
>
> Didier
>
>
>
>
> Sutherland, Robert D (DFG) wrote:
>>  Hi Jeff,
>>
>>  This is what I did.
>>
>>  HistBreaks<-quantile(datafileDf$nhunters,probs=c(0.1,0.2,
>>  0.4,0.6,0.8,0.9,1.0),na.rm=TRUE)
>>  np<-findInterval(datafileDf$nhunters, histBreaks, all.inside=TRUE)
>>  colorsToUse<-colorSchemeV5
>>  plot.polylist(datafilePolys, col=colorsToUse[np],  forcefill=FALSE)
>>  plot.polylist(datafilePolys,  density = c(-1,20,20,-1,-1,-1,-1)[np],
>>  angle=c(0,0,90,0,0,0,0)[np], forcefill=FALSE,add=TRUE)
>>
>>  the first plot.polylist plots the outline of the polygon, the second
>>  call "colors" the polygon.
>>
>>  I hope this helps.
>>
>>  Bob
>>
>>  -----Original Message-----
>>  From: r-sig-geo-bounces at stat.math.ethz.ch
>>  [mailto:r-sig-geo-bounces at stat.math.ethz.ch] On Behalf Of Jeff Jorgensen
>>  Sent: Wednesday, July 18, 2007 9:30 AM
>>  To: r-sig-geo at stat.math.ethz.ch
>>  Subject: [R-sig-Geo] plot.polylist polygon plot order
>>
>>  Hello,
>>
>>  I've imported a shapefile of polygons (R v2.5.1 winxp, maptools v0.6-13)
>>
>>  and I'm trying to assign colors to polygons in plot.polylist().  Is there
>>  a way to force the order in which polygons are plotted get the correct
>>  color associations to the corresponding polygons?
>>
>>  Best regards,
>>
>>  Jeff
>> 
>>
>> 
>
>
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-- 
Roger Bivand
Economic Geography Section, Department of Economics, Norwegian School of
Economics and Business Administration, Helleveien 30, N-5045 Bergen,
Norway. voice: +47 55 95 93 55; fax +47 55 95 95 43
e-mail: Roger.Bivand at nhh.no