Nothing
svgviewr.lines <- function(x, file=NULL, y=NULL, col="black", z.index=0, layer="",
label="", lwd=1, opacity=1, arrow.len = NULL, arrow.angle = NULL, append=TRUE,
tag.name="line"){
# IF X OR Y ARE VECTOR, MAKE SINGLE COLUMN MATRIX
if(is.vector(x)) x <- matrix(x, ncol=1)
if(!is.null(y) && is.vector(y)) y <- matrix(y, ncol=1)
# IF Y IS NON-NULL, ADD AS SECOND COLUMN TO X
if(!is.null(y)) x <- cbind(x, y)
# 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, 0)
# 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("col", "label", "layer", "arrow.len", "arrow.angle", "opacity", "lwd", "z.index")
# CONVERT GRAPHICAL PARAMETERS TO VECTORS WITH SAME NUMBER OF ELEMENTS OF FIRST X DIMENSION
for(gpar in svg_gp){
if(dim(x)[1] > 2 && length(get(gpar)) < dim(x)[1]-1){
assign(gpar, rep(get(gpar), dim(x)[1]))
}else if(dim(x)[1] == 2 && length(get(gpar)) > dim(x)[1]-1){
assign(gpar, paste(get(gpar), collapse=","))
}
}
# WRITE LINES TO SVG STRUCTURE
for(i in 1:(dim(x)[1]-1)){
# COLLAPSE VALUES INTO COMMA-SEPARATED STRING
x1c <- paste(x[i, 1, ], collapse=",")
y1c <- paste(x[i, 2, ], collapse=",")
z1c <- paste(x[i, 3, ], collapse=",")
x2c <- paste(x[i+1, 1, ], collapse=",")
y2c <- paste(x[i+1, 2, ], collapse=",")
z2c <- paste(x[i+1, 3, ], collapse=",")
# CHECK THAT POINTS CHANGE POSITION BEFORE PRINTING ANIMATION STRING
#sum_sd0 <- sum(apply(matrix(x[i, , ], ncol=3, byrow=T), 2, sd))
#sum_sd1 <- sum(apply(matrix(x[i+1, , ], ncol=3, byrow=T), 2, sd))
#if(is.na(sum_sd0) || is.na(sum_sd1) || sum_sd0 > 0 || sum_sd1 > 0){
# ADD ARROW HEAD PARAMETERS, IF SPECIFIED
arrow_len_param <- ''
arrow_angle_param <- ''
tag_name <- 'line'
if(i == (dim(x)[1]-1) && tag.name == 'arrow') tag_name <- 'arrow'
if(i == (dim(x)[1]-1) && !is.null(arrow.len)) arrow_len_param <- paste0(" l=\"", arrow.len[i], "\" ")
if(i == (dim(x)[1]-1) && !is.null(arrow.len)) arrow_angle_param <- paste0(" a=\"", arrow.angle[i], "\" ")
new_lines <- c(new_lines, paste("\t<", tag_name," z-index=\"", z.index[i], "\" layer=\"", layer[i],
"\" x1=\"", x1c, "\" y1=\"", y1c, "\" z1=\"", z1c,
"\" x2=\"", x2c, "\" y2=\"", y2c, "\" z2=\"", z2c, "\"",
arrow_len_param, arrow_angle_param,
" label=\"", label[i], "\" stroke=\"", webColor(col[i]), "\" stroke-width=\"", lwd[i],
"\" stroke-opacity=\"", opacity[i], "\" ></", tag_name, ">", sep=""))
}
# 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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