[RQt-devel] par(xpd=NA) and the layout approach in qtpaint

[Yihui Xie]

Thanks! That was my guess, but it does not seem to work, e.g.:

# all layers with clip=FALSE but still get clipped
library(qtpaint)
scene = qscene()
figLayer = qlayer(scene, clip = FALSE)
titlePainter = function(item, painter) {
    qdrawText(painter, paste(rep("The Useless Title", 5), collapse = " - "),
        300, 10, "center", "center")
}
yAxisPainter = function(item, painter) {
    qdrawText(painter, as.character(pretty(1:400)), 37.5, pretty(1:400))
}
plotPainter = function(item, painter) {
    qdrawPoint(painter, runif(1000, 0, 600), runif(1000, 0, 400))
    qdrawRect(painter, 1, 1, 600 - 1, 400 - 1)
}
xAxisPainter = function(item, painter) {
    qdrawText(painter, as.character(pretty(1:600)), pretty(1:600),
        37.5)
}
mouseLocator = function(item, event) {
    print(as.numeric(event$pos()))
}
titleLayer = qlayer(figLayer, titlePainter, mousePressFun = mouseLocator,
    limits = qrect(0, 0, 600, 20), clip = FALSE, row = 0, col = 1)
yaxis = qlayer(figLayer, yAxisPainter, mousePressFun = mouseLocator,
    limits = qrect(0, 0, 75, 400), clip = FALSE, row = 1, col = 0)
plotLayer = qlayer(figLayer, plotPainter, mousePressFun = mouseLocator,
    limits = qrect(0, 0, 600, 400), clip = FALSE, row = 1, col = 1)
xaxis = qlayer(figLayer, xAxisPainter, mousePressFun = mouseLocator,
    limits = qrect(0, 0, 600, 75), clip = FALSE, row = 2, col = 1)

layout = figLayer$gridLayout()

layout$setRowStretchFactor(0, 1)
layout$setRowStretchFactor(1, 5)
layout$setRowStretchFactor(2, 1)
layout$setColumnStretchFactor(0, 1)
layout$setColumnStretchFactor(1, 5)

print(view <- qplotView(scene = scene))


Regards,
Yihui
--
Yihui Xie <xieyihui at gmail.com>
Phone: 515-294-6609 Web: http://yihui.name
Department of Statistics, Iowa State University
2215 Snedecor Hall, Ames, IA



On Wed, Sep 1, 2010 at 7:26 AM, Hadley Wickham <hadley at rice.edu> wrote:
> For the answer to your first question, turning clipping off for that layer.
>
> Hadley
>
> On Wednesday, September 1, 2010, Yihui Xie <xie at yihui.name> wrote:
>> Hi all,
>>
>> I'm wondering if there are any approaches to completely show the
>> graphical elements on the boundaries under a layout containing several
>> layers. This is like the functionality par(xpd=NA) in base R graphics.
>> See the example below that the texts for the origin (0,0) on the axes
>> are partially hidden.
>>
>> My another problem is, I don't really understand the layout approach,
>> although I've been reading the qtpaint vignette and digging the Nokia
>> Qt documentations. Specifically, how should we define the coordinate
>> system in each layer in a layout? (I experimented with mouse clicking
>> to get locations but got even more confused) With a single layer, I
>> can plot the data using its range to define the limits and everything
>> is fine. Besides, does anyone have a working demo to draw a simplest
>> plot with the layout approach? I struggled with
>> set(Column|Row)(Maximum|Minimum|Preferred)(Width|Height) and
>> set(Column|Row)StretchFactor, but they do not behave as we expect them
>> to, e.g. the stretch factor being 0 will not restrict the height/width
>> of a layer to be a fixed value -- they change as we resize the window.
>>
>> Below is the R code:
>>
>> # I need hints on how to split the root layer into several regions
>> # and what are their coordinate systems
>> library(qtpaint)
>> scene = qscene()
>> figLayer = qlayer(scene,limits=qrect(0,0,675,550))
>> titlePainter = function(item, painter) {
>>     qdrawText(painter, 'The Useless Title', 300, 0,'center','bottom')
>>     tmp=as.matrix(titleLayer$boundingRect())
>>     qdrawRect(painter, tmp[1,1],tmp[1,2],tmp[2,1],tmp[2,2])
>> }
>> yAxisPainter = function(item, painter) {
>>     qdrawText(painter, as.character(pretty(1:400)), 37.5, pretty(1:400))
>> }
>> plotPainter = function(item, painter) {
>>     qdrawPoint(painter, runif(1000, 0, 600), runif(1000, 0, 400))
>>     qdrawRect(painter, 1, 1, 600-1, 400-1)
>> }
>> xAxisPainter = function(item, painter) {
>>     qdrawText(painter, as.character(pretty(1:600)), pretty(1:600), 37.5)
>> }
>> mouseLocator = function(item, event){
>>     print(as.numeric(event$pos()))
>> }
>> titleLayer = qlayer(figLayer, titlePainter,
>> mousePressFun=mouseLocator, row=2,col=1)
>> yaxis = qlayer(figLayer, yAxisPainter,mousePressFun=mouseLocator,row = 1,col=0)
>> plotLayer = qlayer(figLayer, plotPainter,
>> mousePressFun=mouseLocator,row = 1, col = 1)
>> xaxis = qlayer(figLayer, xAxisPainter, mousePressFun=mouseLocator,row
>> = 0, col = 1)
>>
>> layout = figLayer$gridLayout()
>>
>> layout$setRowMaximumHeight(0, 75)
>> layout$setRowMinimumHeight(0, 60)
>> # main plot region: 400x600
>> layout$setRowPreferredHeight(1, 400)
>> layout$setRowMaximumHeight(2, 75)
>> layout$setRowMinimumHeight(2, 60)
>>
>> layout$setColumnMaximumWidth(0, 75)
>> layout$setColumnMinimumWidth(0, 60)
>> layout$setColumnPreferredWidth(1, 600)
>> layout$setRowStretchFactor(0, 0)
>> layout$setRowStretchFactor(1, 1)
>> layout$setRowStretchFactor(2, 0)
>> layout$setColumnStretchFactor(0, 0)
>> layout$setColumnStretchFactor(1, 1)
>>
>> print(view<-qplotView(scene = scene))
>>
>>
>> #################################################
>>
>>> sessionInfo()
>> R version 2.11.1 (2010-05-31)
>> x86_64-pc-linux-gnu
>>
>> locale:
>> [1] en_US.utf8
>>
>> attached base packages:
>> [1] stats     graphics  grDevices utils     datasets  methods   base
>>
>> other attached packages:
>> [1] qtpaint_0.7.9
>>
>> loaded via a namespace (and not attached):
>> [1] qtbase_0.8-4 tools_2.11.1
>>
>>
>> Thanks a lot!
>>
>> Regards,
>> Yihui
>> --
>> Yihui Xie <xieyihui at gmail.com>
>> Phone: 515-294-6609 Web: http://yihui.name
>> Department of Statistics, Iowa State University
>> 3211 Snedecor Hall, Ames, IA
>> _______________________________________________
>> Qtinterfaces-devel mailing list
>> Qtinterfaces-devel at lists.r-forge.r-project.org
>> https://lists.r-forge.r-project.org/cgi-bin/mailman/listinfo/qtinterfaces-devel
>>
>
> --
> Assistant Professor / Dobelman Family Junior Chair
> Department of Statistics / Rice University
> http://had.co.nz/
>