[R] Gantt chart - more than one colour on a line

[David Winsemius]

On May 11, 2010, at 11:52 AM, D Holl wrote:

> Dear all
>
> I would like to plot a Gantt chart type plot, but with more than one
> colour on a line. The gantt.chart function will allow me to add more
> than one bar on a line, but it is in the same colour as the first bar
> on that line. For example (using the code helpful provided in the R
> graphics gallery)
>
> require(plotrix)
>
> Ymd.format <- "%Y/%m/%d"
>
> Ymd <- function(x){ as.POSIXct(strptime(x, format=Ymd.format))}
> gantt.info <- list(
>  labels     =c("First task","Second task","Third task","Fourth
> task","Fifth task","First task"),
>  starts      
> = 
> Ymd 
> (c("2004/01/01","2004/02/02","2004/03/03","2004/05/05","2004/09/09",
> "2004/09/01")),
>  ends        
> = 
> Ymd 
> (c("2004/03/03","2004/05/05","2004/05/05","2004/08/08","2004/12/12",
> "2004/09/10")),
>  priorities =c(1,2,3,4,5,5))
>
> gantt.chart(gantt.info,main="Calendar date Gantt chart")
>
> Both bars in the first line are red=priority level 1, rather than one
> red (level 1) and one purple (level 5)
>
> Am I missing some simple option in the gantt.chart function, or do I
> have to program the chart another way?

Looking at the code, it is fairly clear that the coloring is at the  
task level (taskcolors is the variable after all) rather than at the  
interval level.

-- 
David.
>
> Many thanks for any assistance,
>
> Kind regards
>
> DD
>
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David Winsemius, MD
West Hartford, CT