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2011-11-12T18:20:04.093
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<p>I finally decided to ask directy to <a href="http://www.stat.auckland.ac.nz/~paul/" rel="nofollow">Paul Murrell</a>, the creator of grid and <a href="http://cran.r-project.org/web/packages/gridSVG/index.html" rel="nofollow">gridSVG</a>. He kindly provided some good advices and code which completely solved the problem with an approach similar to the advice from @mbq. I modified his code to write this function:</p> <pre><code>library(gridSVG) library(XML) animateTrellis <- function(object, file='animatedSVG.svg', duration=.1, step=2, show=TRUE){ nLayers <- dim(object) stopifnot(nLayers>1) for (i in seq_len(nLayers)){ p <- object[i] label <- p$condlevels[[1]][i] ##Create intermediate SVG files g <- grid.grabExpr(print(p, prefix=label), name=label) if (i==1){ ## First frame ga <- animateGrob(g, group=TRUE, visibility="hidden", duration=duration, begin=step) } else if (i==nLayers){ ##Last Frame gg <- garnishGrob(g, visibility='hidden') ga <- animateGrob(gg, group=TRUE, visibility="visible", duration=duration, begin=step*(i-1)) } else { ##any frame gg <- garnishGrob(g, visibility='hidden') gaV <- animateGrob(gg, group=TRUE, visibility="visible", duration=duration, begin=step*(i-1)) ga <- animateGrob(gaV, group=TRUE, visibility="hidden", duration=duration, begin=step*i) } grid.newpage() grid.draw(ga) fich <- tempfile(fileext='.svg') gridToSVG(fich) ## Combine all if (i==1) { svgTop <- xmlParse(fich) nodeTop <- getNodeSet(svgTop, "//svg:g[@id='gridSVG']", c(svg="http://www.w3.org/2000/svg"))[[1]] } else { svgChildren <- xmlParse(fich) node <- getNodeSet(svgChildren, "//svg:g[@id='gridSVG']/*", c(svg="http://www.w3.org/2000/svg")) addChildren(nodeTop, node) } unlink(fich) } saveXML(svgTop, file=file) dev.off() if (show) browseURL(file) invisible(svgTop) } </code></pre> <p>Then I can produce the SVG file with animation:</p> <pre><code>p <- xyplot(Sepal.Length~Petal.Length|Species, data=iris, layout=c(1, 1)) animateTrellis(p, file='iris.svg') </code></pre>
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1. USOscar Perpiñán
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