heatmap_layout: Create a heatmap

In ggalign: A 'ggplot2' Extension for Consistent Axis Alignment

Create a heatmap

Description

heatmap_layout is a specialized version of quad_discrete(), which simplifies the creation of heatmap plots by integrating essential elements for a standard heatmap layout, ensuring that the appropriate data mapping and visualization layers are automatically applied. ggheatmap is an alias for heatmap_layout.

Usage

heatmap_layout(
  data = NULL,
  mapping = aes(),
  ...,
  width = NA,
  height = NA,
  filling = waiver(),
  theme = NULL,
  active = NULL
)

Arguments

data	Default dataset to use for the layout. If not specified, it must be supplied in each plot added to the layout. By default, it will try to inherit from parent layout. fortify_matrix() will be used to convert data to a matrix.
mapping	Default list of aesthetic mappings to use for main plot in the layout. If not specified, must be supplied in each layer added to the main plot.
...	Additional arguments passed to fortify_matrix().
width, height	The relative width/height of the main plot, can be a unit object.
filling	A single string of "raster" or "tile" to indicate the filling style. By default, waiver() is used, which means that if the input matrix has more than 20,000 cells (nrow * ncol > 20000), geom_raster() will be used for performance efficiency; for smaller matrices, geom_tile() will be used. To customize the filling style, set this to NULL. For backward compatibility, a single boolean value is acceptable: TRUE means waiver(), and FALSE means NULL. By default, the classic heatmap color scheme scale_fill_gradient2(low = "blue", high = "red") is utilized for continuous values. You can use the options "ggalign.heatmap_continuous_fill" or "ggalign.heatmap_discrete_fill" to modify the default heatmap body filling color scale. See scale_fill_continuous() or scale_fill_discrete() for details on option settings.
theme	A theme() object used to customize various elements of the layout, including guides, title, subtitle, caption, margins, panel.border, and background. By default, the theme will inherit from the parent layout. It also controls the panel spacing for all plots in the layout.
active	A active() object that defines the context settings when added to a layout.

Value

A HeatmapLayout object.

ggplot2 specification

The data input will be converted to a matrix using fortify_matrix(), and the data in the underlying main plot will contain the following columns:

• .panel_x and .panel_y: the column and row panel groups.

• .x and .y: an integer index of x and y coordinates

• .discrete_x and .discrete_y: a factor of the data labels (only applicable when .row_names and .column_names exists).

• .row_names and .column_names: A character of the row and column names of the original matrix (only applicable when names exist).

• .row_index and .column_index: the row and column index of the original matrix.

• value: the actual matrix value.

Examples

ggheatmap(1:10)
ggheatmap(letters)
ggheatmap(matrix(rnorm(81), nrow = 9L))

ggalign documentation built on June 8, 2025, 11:25 a.m.