set plot aspect ratio

importFrom(ggplot2,aes_)

importFrom(ggplot2,aes_string)

importFrom(ggplot2,binned_scale)

importFrom(ggplot2,coord_fixed)

importFrom(ggplot2,discrete_scale)

importFrom(ggplot2,draw_key_path)

importFrom(ggplot2,draw_key_polygon)

#' @param drop logical.

#' @param grid_col colour of panel grid.

#' @param grid_size size of panel grid.

#' @param fixed if TRUE (default), the coordinates will have a fixed aspect ratio.

#' @param fixed if TRUE (default), will add \code{coord_fixed()} to plot.

#' @param use_md logical. if TRUE, will use \code{ggtext::element_markdown()} to

#' draw the axis labels.

#' @param facets NULL or a parameters list of \code{facet_wrap}.

#' @param ... other parameters.

#' @return a gg object.

#' @importFrom ggplot2 coord_fixed

#' @rdname qcorrplot

#' @author Hou Yun

#' @export

  ## coord fixed?

  if(isTRUE(fixed)) {

    p <- p + coord_fixed()

    p <- p + ggplot2::coord_fixed()

  }

  ## remove the panel background

\item{grid_size}{size of panel grid.}

\item{fixed}{if TRUE (default), the coordinates will have a fixed aspect ratio.}

\item{fixed}{if TRUE (default), will add \code{coord_fixed()} to plot.}

\item{use_md}{logical. if TRUE, will use \code{ggtext::element_markdown()} to

draw the axis labels.}