svgviewr.text <- function(x, file = NULL, y = NULL, labels = NULL, layer="",
font.size = 12, col = "black", text.anchor = "middle", font.family = "Arial",
opacity = 1, font.style = "", font.weight = "", letter.spacing = 0, writing.mode = "",
glyph.orientation.vertical = "", z.index=0, append=TRUE){
# IF Y IS NON-NULL, ADD AS SECOND COLUMN TO X
if(!is.null(y)) x <- cbind(x, y)
# IF POINT COORDINATES ARE VECTOR SET AS MATRIX
if(is.vector(x)) x <- matrix(x, nrow=1, ncol=length(x))
# SUPRESS EXPONENTIAL FORMAT FOR NEARLY ZERO VALUES (CANNOT BE READ BY SVG READER)
options(scipen=10)
x <- round(x, 8)
# EMPTY NEW LINES
new_lines <- rep(NA, dim(x)[1])
# IF POINTS ARE MATRIX, MAKE INTO AN ARRAY
if(length(dim(x)) == 2) x <- array(x, dim=c(dim(x), 1))
# IF SECOND DIMENSION IS OF LENGTH TWO, ADD THIRD DIMENSION OF ZEROS
if(dim(x)[2] == 2){
xn <- array(NA, dim=c(dim(x)[1], 3, dim(x)[3]))
for(i in 1:dim(x)[3]){
if(is.matrix(x[, , i])){
xn[, , i] <- cbind(x[, , i], rep(0, nrow(x[, , i])))
}else{
xn[, , i] <- c(x[, , i], 0)
}
}
x <- xn
}
# SET GRAPHICAL PARAMETERS
svg_gp <- c("labels", "layer", "font.size", "col", "text.anchor", "font.family",
"opacity", "font.style", "font.weight", "letter.spacing", "writing.mode",
"glyph.orientation.vertical", "z.index")
# CONVERT GRAPHICAL PARAMETERS TO VECTORS WITH SAME NUMBER OF ELEMENTS OF FIRST X DIMENSION
for(gpar in svg_gp){
if(length(get(gpar)) < dim(x)[1]){
assign(gpar, rep(get(gpar), dim(x)[1]))
}else if(length(get(gpar)) > dim(x)[1]){
assign(gpar, paste(get(gpar), collapse=","))
}
}
# WRITE TEXT ELEMENTS TO SVG STRUCTURE
for(i in 1:dim(x)[1]){
# COLLAPSE VALUES INTO COMMA-SEPARATED STRING
xc <- paste(x[i, 1, ], collapse=",")
yc <- paste(x[i, 2, ], collapse=",")
zc <- paste(x[i, 3, ], collapse=",")
# CHECK THAT POINTS CHANGE POSITION BEFORE PRINTING ANIMATION STRING
sum_sd <- sum(apply(matrix(x[i, , ], ncol=3, byrow=T), 2, sd))
if(!is.na(sum_sd) && sum_sd == 0){
xc <- x[i, 1, 1]
yc <- x[i, 2, 1]
zc <- x[i, 3, 1]
}
new_lines[i] <- paste("\t<text z-index=\"", z.index[i], "\" layer=\"", layer[i],
"\" x=\"", xc, "\" y=\"", yc, "\" z=\"", zc,
"\" font-size=\"", font.size[i], "\" text-anchor=\"", text.anchor[i],
"\" font-family=\"", font.family[i], "\" opacity=\"", opacity[i],
"\" font-weight=\"", font.weight[i], "\" letter-spacing=\"", letter.spacing[i],
"\" fill=\"", col[i], "\" writing-mode=\"", writing.mode[i],
"\" glyph-orientation-vertical=\"", glyph.orientation.vertical[i],
"\" >", labels[i], "</text>", sep="")
}
# REMOVE SCIENTIFIC NOTATION
options(scipen=0)
# REMOVE NA LINES
new_lines <- new_lines[!is.na(new_lines)]
# IF FILE IS NULL, RETURN LINES OF SVG OBJECTS
if(is.null(file)) return(new_lines)
# SAVE NEW LINES TO FILE
svgviewr.write(new_lines, file, append=append)
}
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