easySVG: An Easy SVG Basic Elements Generator

#' easySVG package can generate SVG elements easily
#'
#' @author
#' Yuting Dai \url{forlynna@sjtu.edu.cn}
#' @seealso
#' Useful links:
#'
#' \url{https://github.com/ytdai/easySVG}
#'
#' Report bugs at \url{https://github.com/ytdai/easySVG/issues}
#'
#' Scalable Vector Graphics (SVG) is an XML-based vector image format for
#' two-dimensional graphics with support for interactivity and animation.
#' The SVG specification is an open standard developed by the World Wide
#' Web Consortium (W3C) since 1999.
#'
#' @examples
#'
#' line <- line.svg(x1 = 50, y1 = 20, x2 = 150, y2 = 20)
#' rect <- rect.svg(x = 50, y = 60, width = 100, height = 10, fill = "blue")
#' circle <- circle.svg(cx = 80, cy = 100, r = 10, fill = "blue")
#' ellipse <- ellipse.svg(cx = 100, cy = 120, rx = 20, ry = 5, fill = "blue")
#'
#' points <- matrix(c( 50, 100, 120, 140, 135, 145), nrow = 3, ncol = 2)
#' polygon <- polygon.svg(points = points, fill = "green", stroke = "none")
#' polyline <- polyline.svg(points = points)
#' text <- get.text.svg(x = 10, y = 20, text.content = "This is a text element", font.size = 6)
#'
#' group.content <- list(line, rect,
#'                       circle, ellipse,
#'                       polygon, polyline,
#'                       text)
#' group <- group.svg(id = "group_1", group.content = group.content)
#'
#' \dontrun{
#' svg.name <- paste0(tempfile(),".svg")
#' pack.svg(pack.content = group, output.svg.name = svg.name)
#' }
#'
#' @docType package
#' @name easySVG
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