add_geom_point <- function(p, fields, size, color) {
# validate size inputs
req_size_inputs <- c("size_mapping_enabled", "size_map", "size_set")
if (!all(req_size_inputs %in% names(size)))
stop("some required size input fields are missing")
if (!is.logical(size$size_mapping_enabled))
stop("size_mapping_enabled must be a logical value")
# validate color inputs
req_color_inputs <- c("alpha", "color_mapping_enabled",
"color_map", "color_set", "color_discrete")
if (!all(req_color_inputs %in% names(color)))
stop("some required color input fields are missing")
if (!is.logical(color$color_mapping_enabled))
stop("color_mapping_enabled must be a logical value")
if (!is.logical(color$color_discrete))
stop("color_discrete must be a logical value")
# build up list of "mapping" and "setting" expressions
# which will go into a ggplot2 layer at the end
mapping <- rlang::exprs()
setting <- rlang::exprs()
# COLOR
if (color$color_mapping_enabled) {
if (color$color_map != CONST_NONE) {
color_expr <- if_else_expr(color$color_discrete == TRUE,
rlang::expr(as.factor(!!sym(color$color_map))),
rlang::expr(!!sym(color$color_map)))
mapping <- append_exprs(mapping, color = !!(color_expr))
}
} else {
if (color$color_set != CONST_NONE)
setting <- append_exprs(setting, color = !!color$color_set)
}
# ALPHA
if (color$alpha != 1)
setting <- append_exprs(setting, alpha = !!as.numeric(color$alpha))
# SIZE
if (size$size_mapping_enabled) {
if (size$size_map != CONST_NONE)
mapping <- append_exprs(mapping, size = !!sym(size$size_map))
} else {
if (size$size_set != CONST_DEFAULT_POINT_SIZE)
setting <- append_exprs(setting, size = !!as.numeric(size$size_set))
}
# compile expressions into layer
if (length(mapping) > 0) {
p <- p %++% geom_point(aes(!!!mapping), !!!setting)
} else {
p <- p %++% geom_point(!!!setting)
}
p
}
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