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# Draws a scatter plot with a point for each row of slice
# Author : Sylvain Mareschal <maressyl@gmail.com>
# License : GPL3 http://www.gnu.org/licenses/gpl.html
draw.points = function(
slice,
start,
end,
column = "value",
pointColor = "#666666",
cex.lab = 1,
cex = 0.6,
pch = "+",
bty = "o",
fg = "#000000",
...
) {
# Coercions
if(is.numeric(start)) start <- as.integer(start)
if(is.numeric(end)) end <- as.integer(end)
# Checks
if(!is.integer(start)) stop("'start' must be integer or numeric")
if(!is.integer(end)) stop("'end' must be integer or numeric")
if(!is.data.frame(slice)) stop("'slice' must be a data.frame")
if(!"start" %in% names(slice)) stop("'slice' needs a 'start' column")
if(!"end" %in% names(slice)) stop("'slice' needs a 'end' column")
if(!column %in% names(slice)) stop("'column' can not be found in 'slice'")
# Background
draw.bg(
start = start,
end = end,
cex.lab = cex.lab,
bty = bty,
fg = fg,
...
)
if(nrow(slice) > 0) {
# Point color
if(is.function(pointColor)) {
environment(pointColor) <- environment()
pointColor <- pointColor()
}
# Points
graphics::points(
x = (slice$start + slice$end)/2,
y = slice[[column]],
pch = pch,
col = pointColor,
cex = cex
)
} else {
# No box (not enough)
graphics::text(
x = mean(graphics::par("usr")[1:2]),
y = mean(graphics::par("usr")[3:4]),
label = paste(nrow(slice), "element(s) in this range"),
col = fg,
adj = c(0.5, 0.5),
cex = cex.lab
)
}
# Surrounding box
graphics::box(
which = "plot",
col = fg,
bty = bty
)
}
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