[R] Gantt chart problem after upgrade to R 2.4.0

[John Kane]

--- Jim Lemon <jim at bitwrit.com.au> wrote:

> John Kane wrote:
> > I am having a problem with a  gantt  chart since
> > moving to R2.4.0. from 2.3.1
> > ...
> 
> Okay, I think I have fixed the problem. I don't yet
> know why it worked 
> on Windows and not Linux, but this should work on
> both. 

Looks pretty good to me.  I am getting a date
1820/01/01 rather than just 1820 as I was before but
that seems like what I actually requested :).  Now I
just have to figure out how to handle the formatting. 

Thank you very much, especially on a weekend.


>I have added 
> another argument to the gantt.chart function and it
> seems to overcome 
> the problem. Haven't tested it extensively, so I
> would appreciate any 
> information about bugs that have sprung from the
> ichor of the one I 
> squashed. There will be another version of plotrix
> shortly and this will 
> be in it.
> 
> Jim
> 
> Watch out for the line breaks that have crept into
> the code.
> 
I did a straight cut and paste with no problem. 


gantt.chart<-function(x=NULL,format="%Y/%m/%d",xlim=NULL,taskcolors=NULL,
>  
>
priority.legend=FALSE,vgridpos=NULL,vgridlab=NULL,vgrid.format="%Y/%m/%d",
>   half.height=0.25,hgrid=FALSE,main="",ylab="") {
> 
>   oldpar<-par(no.readonly=TRUE)
>   if(is.null(x)) x<-get.gantt.info(format=format)
>   ntasks<-length(x$labels)
>   plot.new()
>   charheight<-strheight("M",units="inches")
>  
> maxwidth<-max(strwidth(x$labels,units="inches"))*1.5
>   if(is.null(xlim)) xlim=range(c(x$starts,x$ends))
>   npriorities<-max(x$priorities)
>   if(is.null(taskcolors))
>   
>
taskcolors<-color.gradient(c(255,0),c(0,0),c(0,255),npriorities)
>   else {
>    if(length(taskcolors) < npriorities)
>    
> taskcolors<-rep(taskcolors,length.out=npriorities)
>   }
>   bottom.margin<-ifelse(priority.legend,0.5,0)
>  
> par(mai=c(bottom.margin,maxwidth,charheight*5,0.1))
>   par(omi=c(0.1,0.1,0.1,0.1),xaxs="i",yaxs="i")
>  
>
plot(x$starts,1:ntasks,xlim=xlim,ylim=c(0.5,ntasks+0.5),
>    main="",xlab="",ylab=ylab,axes=FALSE,type="n")
>   box()
>   if(nchar(main)) mtext(main,3,2)
>   if(is.null(vgridpos))
> tickpos<-axis.POSIXct(3,xlim,format=vgrid.format)
>   else tickpos<-vgridpos
>   # if no tick labels, use the grid positions if
> there
>   if(is.null(vgridlab) && !is.null(vgridpos))
>    vgridlab<-format.POSIXct(vgridpos,vgrid.format)
>   # if vgridpos wasn't specified, use default axis
> ticks
>   if(is.null(vgridlab))
> axis.POSIXct(3,xlim,format=vgrid.format)
>   else axis(3,at=tickpos,labels=vgridlab)
>   topdown<-seq(ntasks,1)
>   axis(2,at=topdown,labels=x$labels,las=2)
>   abline(v=tickpos,col="darkgray",lty=3)
>   for(i in 1:ntasks) {
>    rect(x$starts[i],topdown[i]-half.height,
>    x$ends[i],topdown[i]+half.height,
>    col=taskcolors[x$priorities[i]],
>    border=FALSE)
>   }
>   if(hgrid)
>  
>
abline(h=(topdown[1:(ntasks-1)]+topdown[2:ntasks])/2,col="darkgray",lty=3)
>   if(priority.legend) {
>    par(xpd=TRUE)
>    plim<-par("usr")
>   
>
gradient.rect(plim[1],0,plim[1]+(plim[2]-plim[1])/4,0.3,col=taskcolors)
>    text(plim[1],0.2,"Priorities  ",adj=c(1,0.5))
>   
>
text(c(plim[1],plim[1]+(plim[2]-plim[1])/4),c(0.4,0.4),c("High","Low"))
>   }
>   par(oldpar)
>   invisible(x)
> }
>