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Map layer: text

Source: R/tm_layers_text.R
tm_text.Rd

Map layer that draws symbols Supported visual variables are: text (the text itself) col (color), size (font size), and fontface (font face).

Usage

tm_text(
  text = tm_const(),
  text.scale = tm_scale(),
  text.legend = tm_legend(),
  text.chart = tm_chart_none(),
  text.free = NA,
  size = tm_const(),
  size.scale = tm_scale(),
  size.legend = tm_legend(),
  size.chart = tm_chart_none(),
  size.free = NA,
  col = tm_const(),
  col.scale = tm_scale(),
  col.legend = tm_legend(),
  col.chart = tm_chart_none(),
  col.free = NA,
  col_alpha = tm_const(),
  col_alpha.scale = tm_scale(),
  col_alpha.legend = tm_legend(),
  col_alpha.chart = tm_chart_none(),
  col_alpha.free = NA,
  fontface = tm_const(),
  fontface.scale = tm_scale(),
  fontface.legend = tm_legend(),
  fontface.chart = tm_chart_none(),
  fontface.free = NA,
  fontfamily = "",
  bgcol = tm_const(),
  bgcol.scale = tm_scale(),
  bgcol.legend = tm_legend(),
  bgcol.chart = tm_chart_none(),
  bgcol.free = NA,
  bgcol_alpha = tm_const(),
  bgcol_alpha.scale = tm_scale(),
  bgcol_alpha.legend = tm_legend(),
  bgcol_alpha.chart = tm_chart_none(),
  bgcol_alpha.free = NA,
  xmod = 0,
  xmod.scale = tm_scale(),
  xmod.legend = tm_legend_hide(),
  xmod.chart = tm_chart_none(),
  xmod.free = NA,
  ymod = 0,
  ymod.scale = tm_scale(),
  ymod.legend = tm_legend_hide(),
  ymod.chart = tm_chart_none(),
  ymod.free = NA,
  angle = 0,
  angle.scale = tm_scale(),
  angle.legend = tm_legend_hide(),
  angle.chart = tm_chart_none(),
  angle.free = NA,
  plot.order = tm_plot_order("size", reverse = FALSE),
  zindex = NA,
  group = NA,
  group.control = "check",
  options = opt_tm_text(),
  ...
)

tm_labels(
  text = tm_const(),
  text.scale = tm_scale(),
  text.legend = tm_legend(),
  text.chart = tm_chart_none(),
  text.free = NA,
  size = tm_const(),
  size.scale = tm_scale(),
  size.legend = tm_legend(),
  size.chart = tm_chart_none(),
  size.free = NA,
  col = tm_const(),
  col.scale = tm_scale(),
  col.legend = tm_legend(),
  col.chart = tm_chart_none(),
  col.free = NA,
  col_alpha = tm_const(),
  col_alpha.scale = tm_scale(),
  col_alpha.legend = tm_legend(),
  col_alpha.chart = tm_chart_none(),
  col_alpha.free = NA,
  fontface = tm_const(),
  fontface.scale = tm_scale(),
  fontface.legend = tm_legend(),
  fontface.chart = tm_chart_none(),
  fontface.free = NA,
  fontfamily = "",
  bgcol = tm_const(),
  bgcol.scale = tm_scale(),
  bgcol.legend = tm_legend(),
  bgcol.chart = tm_chart_none(),
  bgcol.free = NA,
  bgcol_alpha = tm_const(),
  bgcol_alpha.scale = tm_scale(),
  bgcol_alpha.legend = tm_legend(),
  bgcol_alpha.chart = tm_chart_none(),
  bgcol_alpha.free = NA,
  xmod = 0,
  xmod.scale = tm_scale(),
  xmod.legend = tm_legend_hide(),
  xmod.chart = tm_chart_none(),
  xmod.free = NA,
  ymod = 0,
  ymod.scale = tm_scale(),
  ymod.legend = tm_legend_hide(),
  ymod.chart = tm_chart_none(),
  ymod.free = NA,
  angle = 0,
  angle.scale = tm_scale(),
  angle.legend = tm_legend_hide(),
  angle.chart = tm_chart_none(),
  angle.free = NA,
  plot.order = tm_plot_order("AREA", reverse = FALSE, na.order = "bottom"),
  zindex = NA,
  group = NA,
  group.control = "check",
  options = opt_tm_labels(),
  ...
)

tm_labels_highlighted(
  text = tm_const(),
  text.scale = tm_scale(),
  text.legend = tm_legend(),
  text.chart = tm_chart_none(),
  text.free = NA,
  size = tm_const(),
  size.scale = tm_scale(),
  size.legend = tm_legend(),
  size.chart = tm_chart_none(),
  size.free = NA,
  col = tm_const(),
  col.scale = tm_scale(),
  col.legend = tm_legend(),
  col.chart = tm_chart_none(),
  col.free = NA,
  col_alpha = tm_const(),
  col_alpha.scale = tm_scale(),
  col_alpha.legend = tm_legend(),
  col_alpha.chart = tm_chart_none(),
  col_alpha.free = NA,
  fontface = tm_const(),
  fontface.scale = tm_scale(),
  fontface.legend = tm_legend(),
  fontface.chart = tm_chart_none(),
  fontface.free = NA,
  fontfamily = "",
  bgcol = tm_const(),
  bgcol.scale = tm_scale(),
  bgcol.legend = tm_legend(),
  bgcol.chart = tm_chart_none(),
  bgcol.free = NA,
  bgcol_alpha = tm_const(),
  bgcol_alpha.scale = tm_scale(),
  bgcol_alpha.legend = tm_legend(),
  bgcol_alpha.chart = tm_chart_none(),
  bgcol_alpha.free = NA,
  xmod = 0,
  xmod.scale = tm_scale(),
  xmod.legend = tm_legend_hide(),
  xmod.chart = tm_chart_none(),
  xmod.free = NA,
  ymod = 0,
  ymod.scale = tm_scale(),
  ymod.legend = tm_legend_hide(),
  ymod.chart = tm_chart_none(),
  ymod.free = NA,
  angle = 0,
  angle.scale = tm_scale(),
  angle.legend = tm_legend_hide(),
  angle.chart = tm_chart_none(),
  angle.free = NA,
  plot.order = tm_plot_order("AREA", reverse = FALSE, na.order = "bottom"),
  zindex = NA,
  group = NA,
  group.control = "check",
  options = opt_tm_labels(),
  ...
)

opt_tm_text(
  points_only = "ifany",
  point_per = "feature",
  on_surface = FALSE,
  shadow = FALSE,
  shadow.offset.x = 0.1,
  shadow.offset.y = 0.1,
  just = "center",
  along_lines = FALSE,
  bg.padding = 0.4,
  clustering = FALSE,
  point.label = FALSE,
  point.label.gap = 0,
  point.label.method = "SANN",
  remove_overlap = FALSE
)

opt_tm_labels(
  points_only = "ifany",
  point_per = "feature",
  on_surface = FALSE,
  shadow = FALSE,
  shadow.offset.x = 0.1,
  shadow.offset.y = 0.1,
  just = "center",
  along_lines = TRUE,
  bg.padding = 0.4,
  clustering = FALSE,
  point.label = NA,
  point.label.gap = 0.4,
  point.label.method = "SANN",
  remove_overlap = FALSE
)

Arguments

text, text.scale, text.legend, text.chart, text.free

Visual variable that determines the text. See details.

size, size.scale, size.legend, size.chart, size.free

Visual variable that determines the size. See details.

col, col.scale, col.legend, col.chart, col.free

Visual variable that determines the color. See details.

col_alpha, col_alpha.scale, col_alpha.legend, col_alpha.chart, col_alpha.free

Visual variable that determines the color transparency. See details.

fontface, fontface.scale, fontface.legend, fontface.chart, fontface.free

Visual variable that determines the font face. See details.

fontfamily

The font family. See gpar() for details.

bgcol, bgcol.scale, bgcol.legend, bgcol.chart, bgcol.free

Visual variable that determines the background color. See Details.

bgcol_alpha, bgcol_alpha.scale, bgcol_alpha.legend, bgcol_alpha.chart, bgcol_alpha.free

Visual variable that determines the background color transparency. See Details.

xmod, xmod.scale, xmod.legend, xmod.chart, xmod.free

Transformation variable that determines the x offset. See details.

ymod, ymod.scale, ymod.legend, ymod.chart, ymod.free

Transformation variable that determines the y offset. See details. the text. See details.

angle, angle.scale, angle.legend, angle.chart, angle.free

Rotation angle

plot.order

Specification in which order the spatial features are drawn. See tm_plot_order() for details.

zindex

Map layers are drawn on top of each other. The zindex numbers (one for each map layer) determines the stacking order. By default the map layers are drawn in the order they are called.

group

Name of the group to which this layer belongs. This is only relevant in view mode, where layer groups can be switched (see group.control)

group.control

In view mode, the group control determines how layer groups can be switched on and off. Options: "radio" for radio buttons (meaning only one group can be shown), "check" for check boxes (so multiple groups can be shown), and "none" for no control (the group cannot be (de)selected).

options

options passed on to the corresponding opt_<layer_function> function

...

to catch deprecated arguments from version < 4.0

points_only

should only point geometries of the shape object (defined in tm_shape()) be plotted? By default "ifany", which means TRUE in case a geometry collection is specified.

point_per

specification of how spatial points are mapped when the geometry is a multi line or a multi polygon. One of "feature", "segment" or "largest". The first generates a spatial point for every feature, the second for every segment (i.e. subfeature), the third only for the largest segment (subfeature). Note that the last two options can be significant slower.

on_surface

In case of polygons, centroids are computed. Should the points be on the surface? If TRUE, which is slower than the default FALSE, centroids outside the surface are replaced with points computed with sf::st_point_on_surface().

shadow

Shadow behind the text. Logical or color.

shadow.offset.x, shadow.offset.y

Shadow offset in line heights

just

justification of the text relative to the point coordinates. Either one of the following values: "left" , "right", "center", "bottom", and "top", or a vector of two values where first value specifies horizontal and the second value vertical justification. Besides the mentioned values, also numeric values between 0 and 1 can be used. 0 means left justification for the first value and bottom justification for the second value. Note that in view mode, only one value is used.

along_lines

logical that determines whether labels are rotated along the spatial lines. Only applicable if a spatial lines shape is used.

bg.padding

The padding of the background in terms of line heights.

clustering

value that determines whether the text labels are clustered in "view" mode. One of: TRUE, FALSE, or the output of markerClusterOptions.

point.label

logical that determines whether the labels are placed automatically. By default FALSE for tm_text, and TRUE for tm_labels if the number of labels is less than 500 (otherwise it will be too slow).

point.label.gap

numeric that determines the gap between the point and label

point.label.method

the optimization method, either "SANN" for simulated annealing (the default) or "GA" for a genetic algorithm.

remove_overlap

logical that determines whether the overlapping labels are removed

Details

The visual variable arguments (e.g. col) can be specified with either a data variable name (of the object specified in tm_shape()), or with a visual value (for col, a color is expected). Multiple values can be specified: in that case facets are created. These facets can be combined with other faceting data variables, specified with tm_facets().

The .scale arguments determine the used scale to map the data values to visual variable values. These can be specified with one of the available tm_scale_() functions. The default scale that is used is specified by the tmap option scales.var.

The .legend arguments determine the used legend, specified with tm_legend(). The default legend and its settings are determined by the tmap options legend..

The .free arguments determine whether scales are applied freely across facets, or shared. A logical value is required. They can also be specified with a vector of three logical values; these determine whether scales are applied freely per facet dimension. This is only useful when facets are applied (see tm_facets()). There are maximally three facet dimensions: rows, columns, and pages. This only applies for a facet grid (tm_facets_grid()). For instance, col.free = c(TRUE, FALSE, FALSE) means that for the visual variable col, each row of facets will has its own scale, and therefore its own legend. For facet wraps and stacks (tm_facets_wrap() and tm_facets_stack()) there is only one facet dimension, so the .free argument requires only one logical value.

Examples

tm_shape(World, bbox = World) +
  tm_text("name", size="pop_est", col="continent",
      col.scale = tm_scale_categorical(values = "seaborn.dark"),
      col.legend = tm_legend_hide(),
      size.scale = tm_scale_continuous(values.scale = 4),
      size.legend = tm_legend_hide())


metro$upside_down = ifelse(sf::st_coordinates(metro)[,2] < 0, 180, 0)
tm_shape(metro) +
  tm_text(text = "name", size = "pop2020",
      angle = "upside_down", size.legend = tm_legend_hide(),
      col = "upside_down",
      col.scale = tm_scale_categorical(values = c("#9900BB", "#228822")),
      col.legend = tm_legend_hide()) +
  tm_title_out("Which Hemisphere?", position = tm_pos_out("center", "top", pos.v = "bottom"))



metroAfrica = sf::st_intersection(metro, World[World$continent == "Africa", ])
#> Warning: attribute variables are assumed to be spatially constant throughout all geometries
Africa = World[World$continent == "Africa", ]

# to do: update land
library(sf)
st_crs(land) = 4326

tm_shape(land) +
  tm_raster("cover_cls",
        col.scale = tm_scale(
            values = cols4all::c4a("brewer.pastel1")[c(3,7,7,2,6,1,2,2)]
        ),
        col.legend = tm_legend_hide()) +
tm_shape(rivers) +
  tm_lines(lwd = "strokelwd", lwd.scale = tm_scale_asis(values.scale = .3),
       col = cols4all::c4a("brewer.pastel1")[2]) +
    tm_shape(Africa, is.main = TRUE) +
  tm_borders() +
    tm_shape(metroAfrica) +
  tm_symbols(fill = "red", shape = "pop2020", size = "pop2020",
         size.scale = tm_scale_intervals(
               breaks = c(1, 2, 5, 10, 15, 20, 25) * 1e6,
               values.range = c(0.2,2)
         ),
         size.legend = tm_legend("Population in 2020"),
         shape.scale = tm_scale_intervals(
              breaks = c(1, 2, 5, 10, 15, 20, 25) * 1e6,
              values = c(21, 23, 22, 21, 23, 22)
         ),
         shape.legend = tm_legend_combine("size")) +
  tm_labels("name")


tm_shape(metroAfrica) +
  tm_markers(text = "name",
         dots_fill = "red",
         dots_size = 0.3)


tm_shape(metroAfrica) +
  tm_markers(text = "name",
         dots_shape = marker_icon(),
         dots_col = NA,
         dots_fill = "red",
         dots_size = 2,
         ymod = -0.25,
         options = opt_tm_markers(point.label = FALSE, remove_overlap = TRUE))