linesSymbols {svgtools}

Adjust line and/or symbol charts

Description

Adjusts the horizontal (XML attributes 'x', 'x1', 'x2', 'cx' etc.) or vertical (XML attributes 'y', 'y1', 'y2', 'cy' etc.) position of lines (XML elements of type 'line') and/or symbols (see details). Positions are calculated relative to a given frame (XML element of type 'rect') and the position of a data value within the minimum and maximum of a given scale. This process is called scaling.
In preparation, it is necessary to name a group (set attribute 'id' of XML element of type 'g') of lines and/or symbols.

Usage

linesSymbols(
  svg,
  frame_name,
  group_name,
  scale_real,
  values,
  alignment = "vertical",
  has_lines = TRUE,
  symbol_type = NULL,
  ...
)

Arguments

svg

XML document with SVG content

frame_name

Name (attribute 'id') of frame (XML element 'rect') for positioning of elements.

group_name

Name (attribute 'id') of group (XML element 'g') with lines and/or symbols.

scale_real

Numeric vector (e.g. c(0,100)) of arbitrary length. Only minimum and maximum are used for scaling of values.

values

Numeric vector. If a dataframe or matrix is provided, only the first row will be used.

alignment

Character value. Accepts 'horizontal' or 'vertical' (default). See details.

has_lines

Are there lines? (default TRUE)

symbol_type

Character value. Accepts 'circle', 'rect', 'polygon', 'linegroup', 'path', or 'guess' for guessing of type; see details. (default NULL = no symbols)

...

Further arguments used internally by scatterSymbols.

Details

Note: 'Horizontal' alignment refers to adjustment of the x-coordinates of elements, 'vertical' alignment to adjustment of the y-coordinates. This is not to be confused with the orientation of the resulting polyline (and/or the sequence of symbols) that goes from left to right (with alignment='vertical') or from top to bottom (with alignment='horizontal').
Line elements and/or symbols may be grouped together in any order in the SVG file. The function will automatically use XML elements from left to right (with alignment='vertical') or top to bottom (with alignment='horizontal') according to their x/y-coordinates.
Line elements and/or symbols must be prepared in the SVG file in one of the following amounts: a) same amount as data values (or one element less in case of lines), b) one line and/or or two symbols or c) one line and one symbol. In case of b) and c) the function will automatically duplicate line elements and/or symbols with the assumption of fixed shapes (that is, all lines and/or all symbols will look the same as the 'template' that is provided) and constant distance between the elements on the coordinate that will not be adjusted by values ('x' with alignment='vertical' or 'y' with alignment='horizontal').
The function currently supports the following symbol_types:

• circle: XML elements of type 'circle'. Attributes 'cx' or 'cy' are adjusted.

• rect: XML elements of type 'rect'. Attributes 'x' or 'y' are adjusted.

• polygon: XML elements of type 'polygon'. Attribute 'points' is adjusted so that the centroid of the shape matches the scaled value position on the chart.

• linegroup: XML elements of type 'g' that contain elements of type 'line'. Attributes 'x1' and 'x2' or 'y1' and 'y2' of those lines are adjusted so that the mean x- or y-coordinate of all lines in the group matches the scaled value position on the chart.

• path: XML elements of type 'path'. The first command of attribute 'd' is adjusted. The center of path is defined as the midpoint between minimum and maximum x- and y-coordinates of the shape.

Value

XML document with SVG content

Examples

#read SVG file
fpath <- system.file("extdata", "fig11.svg", package="svgtools")
svg <- read_svg(file = fpath)

#adjust lines and/or symbols
set.seed(12345)
values <- matrix(c(rnorm(10,0.95,0.03), rnorm(10,0.75,0.05), 
                   rnorm(10,0.55,0.07), rnorm(10,0.35,0.05), 
                   rnorm(10,0.15,0.03)), nrow = 5, byrow = TRUE)
values[2,8] <- as.numeric(NA)
svg <- linesSymbols(svg = svg, frame_name = "frame", group_name = "gA", 
                    scale_real = c(0,1), values = values[1,], 
                    symbol_type = "rect")
svg <- linesSymbols(svg = svg, frame_name = "frame", group_name = "gB", 
                    scale_real = c(0,1), values = values[2,], 
                    symbol_type = "circle")
svg <- linesSymbols(svg = svg, frame_name = "frame", group_name = "gC", 
                    scale_real = c(0,1), values = values[3,], 
                    has_lines = FALSE, symbol_type = "polygon")
svg <- linesSymbols(svg = svg, frame_name = "frame", group_name = "gD", 
                    scale_real = c(0,1), values = values[4,], 
                    symbol_type = "linegroup")
svg <- linesSymbols(svg = svg, frame_name = "frame", group_name = "gE", 
                    scale_real = c(0,1), values = values[5,], 
                    symbol_type = NULL)