Essential #ggplot2 theme settings

ggplot2_theme_essentials.R

https://www.datanovia.com/en/blog/ggplot-legend-title-position-and-labels/

theme(
    # Legend title and text labels
    #:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
    # Title font color size and face
    legend.title = element_text(color, size, face),
    # Title alignment. Number from 0 (left) to 1 (right)
    legend.title.align = NULL,             
    # Text label font color size and face
    legend.text = element_text(color, size, face), 
    # Text label alignment. Number from 0 (left) to 1 (right)
    legend.text.align = NULL,
    
    # Legend position, margin and background
    #:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
    # Legend position: right, left, bottom, top, none
    legend.position = "right", 
    # Margin around each legend
    legend.margin = margin(0.2, 0.2, 0.2, 0.2, "cm"),
    # Legend background
    legend.background = element_rect(fill, color, size, linetype),
    
    # Legend direction and justification
    #:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
    # Layout of items in legends ("horizontal" or "vertical")
    legend.direction = NULL, 
    # Positioning legend inside or outside plot 
    # ("center" or two-element numeric vector) 
    legend.justification = "center", 
    
    # Background underneath legend keys
    #:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
    legend.key = element_rect(fill, color),  # Key background
    legend.key.size = unit(1.2, "lines"),    # key size (unit)
    legend.key.height = NULL,                # key height (unit)
    legend.key.width = NULL,                 # key width (unit)
    
    # Spacing between legends. 
    #:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
    legend.spacing = unit(0.4, "cm"), 
    legend.spacing.x = NULL,                 # Horizontal spacing
    legend.spacing.y = NULL,                 # Vertical spacing
    
    # Legend box
    #:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
    # Arrangement of multiple legends ("horizontal" or "vertical")
    legend.box = NULL, 
    # Margins around the full legend area
    legend.box.margin = margin(0, 0, 0, 0, "cm"), 
    # Background of legend area: element_rect()
    legend.box.background = element_blank(), 
    # The spacing between the plotting area and the legend box
    legend.box.spacing = unit(0.4, "cm")
)