Partial implementation of "symbols"

[Yusuke Uchiyama]

Hello, 

I partially implemented the function "symbols". I would like to know if there have been already other person doing so. If not, would you please check my implementation and, if acceptable, please use it. I would like to implement other arguments if my function is accepted.

P.S. I am very glad to find that R is added to the software page of GNU web site. 

Yusuke Uchiyama
yusuke@kais.kyoto-u.ac.jp

---cut here---

"symbols" <-
function (x, y = NULL, squares = NULL, rectangles = NULL, add = FALSE, 
    inches = TRUE, ...) 
{
    if (is.list(x)) {
        y <- x[[2]]
        x <- x[[1]]
    }
    if (is.array(x)) {
        y <- x[, 2]
        x <- x[, 1]
    }
    if (!is.null(rectangles)) {
        symbols.rectangles(x, y, rectangles = rectangles, ...)
        invisible()
    }
    if (!is.null(squares)) {
        symbols.squares(x, y, squares = squares, ...)
        invisible()
    }
}

"symbols.rectangles" <-
function (x, y, rectangles, add = FALSE, inches = TRUE, ...) 
{
    xleft <- x - rectangles[1, ]/2
    ybottom <- y - rectangles[2, ]/2
    xright <- x + rectangles[1, ]/2
    ytop <- y + rectangles[2, ]/2
    if (add == FALSE) {
        plot.new()
        xlim <- c(min(xleft), max(xright))
        ylim <- c(min(ybottom), max(ytop))
        plot.window(xlim, ylim)
    }
    rect(xleft, ybottom, xright, ytop, ...)
    invisible()
}

"symbols.squares" <-
function (x, y, squares, add = FALSE, inches = TRUE, ...) 
{
    xleft <- x - squares/2
    ybottom <- y - squares/2
    xright <- x + squares/2
    ytop <- y + squares/2
    if (add == FALSE) {
        plot.new()
        xlim <- c(min(xleft), max(xright))
        ylim <- c(min(ybottom), max(ytop))
        plot.window(xlim, ylim)
    }
    rect(xleft, ybottom, xright, ytop, ...)
    invisible()
}



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