diffBar: Adjust bar chart where bars lie to the left/right or...

In svgtools: Manipulate SVG (Template) Files of Charts

Description

Adjusts the horizontal (XML attribute 'x') or vertical (XML attribute 'y') position as well as width/height of bar segments (XML elements of type 'rect') and optionally value labels (XML elements of type 'text'). Positions are calculated relative to a given frame (XML element of type 'rect'), a nullvalue and the position of a data value within the minimum and maximum of a given scale. Bar segments and, optionally, value labels with values lower than the nullvalue are positioned to the left (in horizontal alignment) or to the bottom (in vertical alignment) of the scaled nullvalue, higher values on the opposite side.
For further description see stackedBar.

Usage

diffBar(
  svg,
  frame_name,
  group_name,
  scale_real,
  values,
  nullvalue = 0,
  alignment = "horizontal",
  has_labels = TRUE,
  label_position = "center",
  decimals = 0,
  display_limits = c(0, 0)
)

Arguments

svg	XML document with SVG content
frame_name	Name (attribute 'id') of frame (XML element 'rect') for positioning bar segments (and value labels).
group_name	Name (attribute 'id') of group (XML element 'g') containing either bar segments (and value labels) or further groups, containing bar segments (and value labels) themselves.
scale_real	Numeric vector (e.g. c(0,100)) of arbitrary length. Only minimum and maximum are used for scaling of values.
values	Either a numeric vector, a numeric matrix or a dataframe with only numeric columns. If a vector is given, it corresponds to one bar (group of bar segments and, optionally, value labels). If a matrix or dataframe is given, rows define the value set for several (stacked) bars grouped together.
nullvalue	Value that defines the "center" of the bar segments (for left/right or bottom/top positioning)
alignment	Character value. Accepts 'horizontal' (default) or 'vertical'. See details.
has_labels	Are there value labels (of XML type 'text') to adjust? (default TRUE)
label_position	Character value. Accepts 'start', 'center' (default) and 'end'. This refers to the underlying bar segments.
decimals	Integer value defining the number of decimal digits of value labels (default 0).
display_limits	Interval for (small) values, that lead to suppression of the corresponding value labels. If only one value x is given, it is turned into the interval c(-x,x). (default 0 = no suppression)

Details

See stackedBar.

Value

XML document with SVG content

Examples

#read SVG file
fpath <- system.file("extdata", "fig7.svg", package="svgtools")
svg <- read_svg(file = fpath)

#adjust bars
df <- data.frame(diff_negative = c(NA,NA,-0.7,NA,-0.33), 
                 diff_positive = c(0.4,0.55,NA,0.02,NA))
svg <- diffBar(svg = svg, frame_name = "frame", group_name = "group", 
               scale_real = c(-1,1), values = df, nullvalue = 0, 
               label_position = "end", decimals = 1, display_limits = 0.1)

svgtools documentation built on Dec. 14, 2021, 5:10 p.m.