rggobi: How to associate a GTK signal with the point that triggered it

[Jeff Marcus]

I'd like to be able to click on a point in a ggobi plot and perform a custom action. My first attempt (based on the results from this search) where my custom action is to print the row for the data frame I've identified: 

gg <- ggobi(my.data.frame)

 gSignalConnect(gg, "identify-point",
    function(ggobi.plot, plot, id, dataset) {
      print(dataset[,id+1])
   }

}

Now when I identify a point by mousing over it,  the custom action occurs. The problem is that identification is that while I'm dragging the mouse many points are selected. I'd like the selection to occur only when I click on the point. I then tried connecting to the "sticky-point-added" signal, which seems to only be triggered by a mouse click. However, I had to rewrite the function above to make things work:

gg <- ggobi(my.data.frame)

gSignalConnect(gg, "sticky-point-added", 
    function(ggobi.plot, id, ignore, dataset) {
      print(dataset[,id+1])
   }

}

Note that the callback function has a different set of arguments. I figured this out by trial and error, using the gSignalGetInfo() function. 

My question:

(*) How can one definitively find out what arguments should be provided with the callback function and what they mean. 

 Thx. 

 Jeff

[Jeff Marcus]

Michael:

  Thanks for the quick response (and moreover for RGtk2)  I actually did that for the sticky-point-added signal and got the following:

> gSignalGetInfo(sigs$'sticky-point-added')

$returnType

GType identifier for 'void'

$signal

sticky-point-added 

               156 

attr(,"class")

[1] "GSignalId"

$parameters

$parameters[[1]]

GType identifier for 'gint'

$parameters[[2]]

GType identifier for 'gint'

$parameters[[3]]

GType identifier for 'GGobiData'

$objectType

GType identifier for 'GGobi'

$runFlags

[1] 34

My problem is that I see two parameters of type gint but didn't know what they represented. After some  trial and error I figured out that the id was the first integer. I still don't know what the second integer is. Is there some convention or some documentation to find out what the parameters actually represent? Thanks. 

 Jeff

On Tue, Jun 17, 2014 at 5:34 PM, Michael Lawrence <lawrence...@gene.com> wrote:

You could do this using RGtk2:

> signals <- gObjectGetSignals(gg)
> names(signals)
 [1] "datad-added"           "brush-motion" "move-point"          
 [4] "identify-point"        "select-variable"                  "splot-new"           
 [7] "variable-added"
     "variable-list-changed" "sticky-point-added"  
[10] "sticky-point-removed"  "clusters-changed"      "display-new"         
[13] "display-selected"    
> gSignalGetInfo(signals$"identify-point")
$returnType
GType identifier for 'void'

$signal
identify-point
            89
attr(,"class")
[1] "GSignalId"

$parameters
$parameters[[1]]
GType identifier for 'GGobiSPlot'

$parameters[[2]]
GType identifier for 'gint'

$parameters[[3]]
GType identifier for 'GGobiData'


$objectType
GType identifier for 'GGobi'

$runFlags
[1] 34

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