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#'Count objects (Contar objetos).
#'
#' @description Count objects by clicking on the image (Contar objetos clicando na imagem)
#' @usage pick_count(im,cex=1,col="red")
#' @param im :Image in ExpImage format (Imagem no formato do ExpImage).
#' @param cex :Font size (Tamanho da fonte)
#' @param col : Font color (Cor da fonte).
#' @author Alcinei Mistico Azevedo (Instituto de ciencias agrarias da UFMG)
#' @return Returns the number of objects in an image (Retorna o numero de objetos em uma imagem).
#' @seealso \code{\link{pick_length}} , \code{\link{pick_resolution}}
#' @examples
#'\dontrun{
#' # Not run: Depende da interacao com uma interface grafica
#' #(It depends on interaction with a graphical interface).
#'
#'
#'im=read_image(example_image(3),plot=TRUE)
#'pick_count(im)
#'}
#'
#'@export
#'
pick_count=function(im,cex=1,col="red"){
plot_image(im)
stop=F
a=0
coordinates=NULL
print("click on objects (Clique sobre os objetos)")
while(isFALSE(stop)){
a=a+1
if(a>1){
text(c$x,c$y,a-1,cex=cex,col=col)
coordinates=rbind(coordinates,unlist(c))
}
c=locator(1)
if(is.null(c)){ stop = TRUE}
}
rownames(coordinates)=1:nrow(coordinates)
list(Number=nrow(coordinates),coordinates=coordinates)
}
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