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davidgohel / rvg

https://davidgohel.github.io/rvg/
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Combine efforts with RSvgDevice? #1

Closed hadley closed 8 years ago

hadley commented 8 years ago

Not sure if @mdecorde is active on github yet, but it would seem natural to combine efforts.

mdecorde commented 8 years ago

Hi, I'm active. Not working on RSVGDevice right now : I've only fixed some bugs and enable UTF-8 labels. If someone propose a fix, I'll publish it on cran.

davidgohel commented 8 years ago

Hi everybody

@mdecorde, what are your thoughts on rvg package regarding to RSVGDevice?

Here is where are differences:

Also rvg (for R Vector Graphics) is also supposed to provide improved versions of devices for MS Word and MS PPTX graphics (regarding to ReporteRs).

David

hadley commented 8 years ago

I think there needs to be a basic (but complete) svg driver device for R, and that's important regardless of the additional features (like interactivity). I'm not sure if it's possible to separate basic & interactive svg into separate packages, but I personally think adding interactivity via svg is fundamentally a hack (in the sense of a pragmatic solution to a complex problem), and I'm not that interested in working on it. I do want an svg device driver that just works, and produces reasonably compact output so I can switch from png to svg for web graphics. I am willing to put some time into that.

I wonder if it's worth pulling out the font metrics stuff into a separate package so multiple device drivers can use it?

timelyportfolio commented 8 years ago

I'd love to help also and strongly agree with @hadley that a good, solid svg dev is a huge gap in R. One feature that I'd like is g grouping by layer or type. Is that possible? In my mind, the scripting, interactivity, etc. should all be separate from the dev.

One big issue with assigning id is if we combine the output in a single dom we are likely to conflict. class or random id will be a much better identifier.

jordansread commented 8 years ago

:+1: to klr and hadley's comments

davidgohel commented 8 years ago

I don't think neither we can separate the basic and the interactive instructions... This is how GraphicsDevice.h and GraphicsEngine.h works. (I agree, what I did can be considered as an hack but it's useful and fun).

I never did it but I think it should be possible to call some C code from a library located in another package (is it?). If it is possible, having the font metrics stuff into a separate package would be useful. It would help for graphics and for reporting (measure the exact size of a cell given the font size and the margins for example).

A compact version is possible, here is what I already noticed:

hadley commented 8 years ago

@timelyportfolio it's not possible at the graphics device level - all the information has already been lost. You probably want gridSVG.

@davidgohel calling C code from another package is fairly easy, unless you use Rcpp, in which case it's incredibly easy

For rasters, I think the right thing to do is embed a base64 encoded url in an <image>.

davidgohel commented 8 years ago

Thanks for the link (and for all the work...), that's very useful. About rasters, I think Cairo can also be used to create the base64 string.

OK, so what next? I can share/modify my code, I can also fix RSVGDevice and push fixes to @mdecorde. I am also interesting in having a font metrics package. What were your thoughts on who would do the work? (I am also willing to work on that but don't want to spend time on something you are working on).

hadley commented 8 years ago

Could you work on the fontmetrics package? (And maybe a package for making a png for a raster image)?

I'll work on updating RSvgDevice, integrating the changes you've made for rvg. I'll make sure to export the C functions, so you can reuse as much as possible in rvg.

timelyportfolio commented 8 years ago

@hadley, maybe I'm just not understanding your response, but with the old svg, we get this plus some helpful meta information. How does it produce the g grouping?

library(ggplot2)

tf <- tempfile()
svg(tf,height=8,width =12)
ggplot(data.frame(x=1:10),aes(x=x,y=x))+geom_point()
dev.off()

image

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style="fill:none;stroke-width:1.062992;stroke-linecap:butt;stroke-linejoin:round;stroke:rgb(49.803922%,49.803922%,49.803922%);stroke-opacity:1;stroke-miterlimit:10;" d="M 813.199219 543.304688 L 813.199219 539.050781 "></path><g style="fill:rgb(49.803922%,49.803922%,49.803922%);fill-opacity:1;">  <use xlink:href="#glyph0-0" x="199.828125" y="553.011719"></use>  <use xlink:href="#glyph0-1" x="205.167188" y="553.011719"></use>  <use xlink:href="#glyph0-2" x="207.834375" y="553.011719"></use></g><g style="fill:rgb(49.803922%,49.803922%,49.803922%);fill-opacity:1;">  <use xlink:href="#glyph0-2" x="402.0625" y="553.011719"></use>  <use xlink:href="#glyph0-1" x="407.401563" y="553.011719"></use>  <use xlink:href="#glyph0-3" x="410.06875" y="553.011719"></use></g><g style="fill:rgb(49.803922%,49.803922%,49.803922%);fill-opacity:1;">  <use xlink:href="#glyph0-4" x="604.292969" y="553.011719"></use>  <use xlink:href="#glyph0-1" x="609.632031" y="553.011719"></use>  <use xlink:href="#glyph0-2" x="612.299219" y="553.011719"></use></g><g style="fill:rgb(49.803922%,49.803922%,49.803922%);fill-opacity:1;">  <use xlink:href="#glyph0-5" x="803.855469" y="553.011719"></use>  <use xlink:href="#glyph0-3" x="809.194531" y="553.011719"></use>  <use xlink:href="#glyph0-1" x="814.533594" y="553.011719"></use>  <use xlink:href="#glyph0-3" x="817.200781" y="553.011719"></use></g><g style="fill:rgb(0%,0%,0%);fill-opacity:1;">  <use xlink:href="#glyph1-0" x="446.179688" y="565.199219"></use></g><g style="fill:rgb(0%,0%,0%);fill-opacity:1;">  <use xlink:href="#glyph2-0" x="19.390625" y="279.726563"></use></g></g></svg>

I'm very aware of gridSVG. Its output is nice and predictable, but it is slow.

hadley commented 8 years ago

I think that's mostly coincidence. A simpler example doesn't seem terribly well structured:

svg()
plot(1:3, axes = F, xlab = "", ylab = "")
points(3:1, col = "red")
dev.off()
<?xml version="1.0" encoding="UTF-8"?>
<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="504pt" height="504pt" viewBox="0 0 504 504" version="1.1">
<g id="surface16">
<rect x="0" y="0" width="504" height="504" style="fill:rgb(100%,100%,100%);fill-opacity:1;stroke:none;"/>
<path style="fill:none;stroke-width:0.75;stroke-linecap:round;stroke-linejoin:round;stroke:rgb(0%,0%,0%);stroke-opacity:1;stroke-miterlimit:10;" d="M 77.101562 416.800781 C 77.101562 420.398438 71.699219 420.398438 71.699219 416.800781 C 71.699219 413.199219 77.101562 413.199219 77.101562 416.800781 "/>
<path style="fill:none;stroke-width:0.75;stroke-linecap:round;stroke-linejoin:round;stroke:rgb(0%,0%,0%);stroke-opacity:1;stroke-miterlimit:10;" d="M 269.101562 244.800781 C 269.101562 248.398438 263.699219 248.398438 263.699219 244.800781 C 263.699219 241.199219 269.101562 241.199219 269.101562 244.800781 "/>
<path style="fill:none;stroke-width:0.75;stroke-linecap:round;stroke-linejoin:round;stroke:rgb(0%,0%,0%);stroke-opacity:1;stroke-miterlimit:10;" d="M 461.101562 72.800781 C 461.101562 76.398438 455.699219 76.398438 455.699219 72.800781 C 455.699219 69.199219 461.101562 69.199219 461.101562 72.800781 "/>
<path style="fill:none;stroke-width:0.75;stroke-linecap:round;stroke-linejoin:round;stroke:rgb(100%,0%,0%);stroke-opacity:1;stroke-miterlimit:10;" d="M 77.101562 72.800781 C 77.101562 76.398438 71.699219 76.398438 71.699219 72.800781 C 71.699219 69.199219 77.101562 69.199219 77.101562 72.800781 "/>
<path style="fill:none;stroke-width:0.75;stroke-linecap:round;stroke-linejoin:round;stroke:rgb(100%,0%,0%);stroke-opacity:1;stroke-miterlimit:10;" d="M 269.101562 244.800781 C 269.101562 248.398438 263.699219 248.398438 263.699219 244.800781 C 263.699219 241.199219 269.101562 241.199219 269.101562 244.800781 "/>
<path style="fill:none;stroke-width:0.75;stroke-linecap:round;stroke-linejoin:round;stroke:rgb(100%,0%,0%);stroke-opacity:1;stroke-miterlimit:10;" d="M 461.101562 416.800781 C 461.101562 420.398438 455.699219 420.398438 455.699219 416.800781 C 455.699219 413.199219 461.101562 413.199219 461.101562 416.800781 "/>
</g>
</svg>

I can assure you that you want is not possible based on the underlying R graphics device API.

davidgohel commented 8 years ago

@hadley Yes, I am ok with that. About rvg known issues:

@timelyportfolio this is produced by Cairo. I don't know how and why but many of the are gathering text elements as set of single symbol. Others things are annoying, for example, circle symbols are not real circle but path (and take much more room). Why do you want grouping on elements? Maybe there is another way to get what you want.

hadley commented 8 years ago

@davidgohel yeah, I wasn't sure what you were doing there. I think we can just set the global doc encoding to utf-8, and then output characters as is. Also could you describe your general approach to clipping? Why not use the native svg stuff?

davidgohel commented 8 years ago

Hum... The reason is... I have written the DrawingML devices (in ReporteRs) first and I just realized it was much simpler in SVG (DML does not support clipping).

timelyportfolio commented 8 years ago

@hadley in the absence of any other identifying information, at least with old svg we can separate the plotting surface (data) with the axes and other components. Although not important for export to Illustrator/Inkscape/Word, this becomes important if we want to match/bind data to their corresponding marks/geoms/points. Maybe, I should just stick with gridSVG.

hadley commented 8 years ago

@timelyportfolio unfortunately that's just not possible in general. I'd recommend making gridSVG faster.

timelyportfolio commented 8 years ago

Well, you say not possible, but svg provides at least a clue with the second level g with clippath when axes are drawn. How does it accomplish this when infrastructure/parts seem about the same?

hadley commented 8 years ago

It's probably something to do with the precise order in which things are plotted, which is frail. I have read the source code for the R graphics device API - what you want IS NOT POSSIBLE.

timelyportfolio commented 8 years ago

@hadley, thanks so much for the clarification.

mdecorde commented 8 years ago

Hi,

I've just added @hadley as collaborator to the RSVGDevice project and merged his work. As I said, I just fixed some things of the original RSVGDevice developped by @tjake and I didn't know the rvg package until yesterday.

I use this package mainly because :

tjake commented 8 years ago

+1