[R] R base package grid does not output raster image

[Uwe Ligges]

On 26.05.2012 23:09, Patrick Nicholson wrote:
> Thanks Uwe, I had tried this before but hearing it again made me realize what I was doing incorrectly. I still can't get it to work with grid.draw(), but here is the solution with ggplot():

I don't see why the Remote Desktop Connection  issue is related to the 
tools used to generate the raster, but if you managed to get it done: 
Congratulations.

Best,
Uwe


>
> library(ggplot2)
> library(grid)
> library(maps)
> library(mapproj)
> library(png)
> library(RgoogleMaps)
>
> counties<- map_data("county", region="virginia")
> states<- map_data("state")
>
> tmp<- tempfile(fileext=".png")
> bg<- GetMap.bbox(range(counties$long), range(counties$lat), destfile=tmp, maptype="satellite", format="png32")
> background<- readPNG(tmp)
> background<- rasterGrob(unclass(background))
>
> p<- ggplot(counties, aes(long, lat)) +
>     coord_map(xlim=c(bg$BBOX$ll[2], bg$BBOX$ur[2]), ylim=c(bg$BBOX$ll[1], bg$BBOX$ur[1])) +
>     geom_path(aes(group=group), color="darkgrey") +
>     geom_path(data=states, aes(group=group), color="white", size=1) +
>     opts(axis.line=theme_blank(),
>          axis.text.x=theme_blank(),
>          axis.text.y=theme_blank(),
>          axis.ticks=theme_blank(),
>          axis.title.x=theme_blank(),
>          axis.title.y=theme_blank(),
>          axis.ticks.length=unit(0, "lines"),
>          axis.ticks.margin=unit(0, "lines"),
>          panel.border=theme_blank(),
>          panel.background=function(...)background,
>          panel.grid.major=theme_blank(),
>          panel.grid.minor=theme_blank(),
>          panel.margin=unit(0, "lines"),
>          legend.position="none",
>          legend.title=theme_blank(),
>          legend.background=theme_blank(),
>          plot.margin=unit(0*c(-1.5, -1.5, -1.5, -1.5), "lines"))
>
> pdf("plot.pdf", height=7, width=7)
> p
> dev.off()
> ________________________________________
> From: Uwe Ligges [ligges at statistik.tu-dortmund.de]
> Sent: Saturday, May 26, 2012 11:43 AM
> To: Patrick Nicholson
> Cc: r-help at R-project.org
> Subject: Re: [R] R base package grid does not output raster image
>
> On 24.05.2012 23:04, Patrick Nicholson wrote:
>> I am running 64-bit R 2.15.0 on a Windows Server 2008 R2 Amazon EC2 instance. grid does not produce output. For example, the following code should print the R logo to the window() device:
>>
>>
>> library(grid)
>> library(png)
>>
>> img.path<- system.file("img", "Rlogo.png", package="png")
>> bg<- readPNG(img.path)
>> background<- rasterGrob(unclass(bg))
>>
>> grid.draw(background)
>>
>>
>> I, however, see nothing. Is there a flag or option I should be using on Windows Server 2008 R2 to enable grid output?
>
> This is a known issue with the Remote Desktop Connection. The raster
> images are not shown via that setup. It works if you work locally at the
> server or is you plot into another device (i.e. a pdf file or so).
>
> Best,
> Uwe Ligges
>
>
>>
>> For clarity, the following is how I am actually using images in R plots. This code works on my laptop (R 2.15.0, ggplot2 0.8.9):
>>
>>
>> library(ggplot2)
>> library(grid)
>> library(maps)
>> library(mapproj)
>> library(png)
>> library(RgoogleMaps)
>>
>> counties<- map_data("county", region="virginia")
>> states<- map_data("state")
>>
>> tmp<- tempfile(fileext=".png")
>> bg<- GetMap.bbox(range(counties$long), range(counties$lat), destfile=tmp, maptype="satellite", format="png32")
>> background<- readPNG(tmp)
>> background<- rasterGrob(unclass(background))
>>
>> ggplot(counties, aes(long, lat)) +
>>     coord_map(xlim=c(bg$BBOX$ll[2], bg$BBOX$ur[2]), ylim=c(bg$BBOX$ll[1], bg$BBOX$ur[1])) +
>>     geom_path(aes(group=group), color="darkgrey") +
>>     geom_path(data=states, aes(group=group), color="white", size=1) +
>>     opts(axis.line=theme_blank(),
>>          axis.text.x=theme_blank(),
>>          axis.text.y=theme_blank(),
>>          axis.ticks=theme_blank(),
>>          axis.title.x=theme_blank(),
>>          axis.title.y=theme_blank(),
>>          axis.ticks.length=unit(0, "lines"),
>>          axis.ticks.margin=unit(0, "lines"),
>>          panel.border=theme_blank(),
>>          panel.background=function(...)background,
>>          panel.grid.major=theme_blank(),
>>          panel.grid.minor=theme_blank(),
>>          panel.margin=unit(0, "lines"),
>>          legend.position="none",
>>          legend.title=theme_blank(),
>>          legend.background=theme_blank(),
>>          plot.margin=unit(0*c(-1.5, -1.5, -1.5, -1.5), "lines"))
>>
>>
>> Thank you,
>> Patrick
>>
>> ______________________________________________
>> R-help at r-project.org mailing list
>> https://stat.ethz.ch/mailman/listinfo/r-help
>> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.