Struct Theme 

pub struct Theme {

    pub figure_background: Color,
    pub axes_background: Color,
    pub grid_color: Color,
    pub grid_width: f64,
    pub show_grid: bool,
    pub spine_color: Color,
    pub spine_width: f64,
    pub show_top_spine: bool,
    pub show_right_spine: bool,
    pub show_bottom_spine: bool,
    pub show_left_spine: bool,
    pub tick_color: Color,
    pub tick_length: f64,
    pub tick_direction: TickDirection,
    pub tick_label_size: f64,
    pub axis_label_size: f64,
    pub title_size: f64,
    pub title_weight: FontWeight,
    pub text_color: Color,
    pub line_width: f64,
    pub marker_size: f64,
    pub marker_alpha: f64,
    pub color_cycle: Vec<Color>,
    pub font_family: Option<String>,
}

Visual theme controlling all rendering defaults.

Every visual parameter that a renderer or layout engine might need lives here. Chart builders read from the active theme to fill in any value the user did not override explicitly.

Fields

figure_background: Color

Background color for the entire figure (outside the axes area).

axes_background: Color

Background color for the axes face (the data-drawing region).

grid_color: Color

Color of major grid lines.

grid_width: f64

Width (in px) of major grid lines.

show_grid: bool

Whether the grid is shown by default (line/scatter: true; bar/hist: false).

spine_color: Color

Color of visible axis spines.

spine_width: f64

Width (in px) of axis spines.

show_top_spine: bool

Whether the top spine is drawn.

show_right_spine: bool

Whether the right spine is drawn.

show_bottom_spine: bool

Whether the bottom spine is drawn.

show_left_spine: bool

Whether the left spine is drawn.

tick_color: Color

Color of tick marks and tick labels.

tick_length: f64

Length (in px) of major tick marks.

tick_direction: TickDirection

Direction ticks extend from the spine.

tick_label_size: f64

Font size (in pt) for tick labels.

axis_label_size: f64

Font size (in pt) for axis labels.

title_size: f64

Font size (in pt) for the plot title.

title_weight: FontWeight

Font weight for the plot title.

text_color: Color

Color used for all text (titles, labels, tick labels).

line_width: f64

Default line width (in px) for line plots.

marker_size: f64

Default marker diameter (in px) for scatter plots.

marker_alpha: f64

Default marker opacity (0.0 = fully transparent, 1.0 = fully opaque).

color_cycle: Vec<Color>

Categorical color cycle used when the user does not specify colors.

font_family: Option<String>

Optional font family override. None means the renderer picks its built-in default (typically a clean sans-serif such as Helvetica).

Implementations

impl Theme

pub fn dark() -> Self

Dark theme with a near-black background and bright, neon-ish data colors.

Suited for dashboards and presentations on dark backgrounds.

pub fn seaborn() -> Self

Seaborn-inspired theme with a tinted axes background and white grid.

Mimics the popular seaborn "whitegrid" aesthetic: a pale blue-grey axes face (#EAEAF2) with white grid lines over it.

pub fn ggplot() -> Self

ggplot2-inspired theme with a grey panel and white grid.

Reproduces the characteristic look of R’s ggplot2: a medium-grey panel (#E5E5E5), white major grid lines, all four spines hidden, and the ggplot2 default qualitative palette.

pub fn publication() -> Self

Publication-ready theme: crisp, minimal, and suitable for print.

• Pure white background, no grid.
• All four spines visible but thin (0.5 px) in near-black.
• Inward ticks for a compact footprint.
• Serif font family for journal aesthetics.

Trait Implementations

impl Clone for Theme

fn clone(&self) -> Theme

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Theme

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for Theme

fn default() -> Self

Returns the canonical default theme matching the Visual Design Brief.

• Background: #FFFFFF, axes face: #FFFFFF
• Grid: #E6E6E6, 1 px, shown by default
• Spines: #333333, 1 px, top + right hidden (despine look)
• Ticks: outward, 4 px, #333333
• Font sizes: title 14 pt bold, axis labels 11 pt, tick labels 9 pt
• Text color: #333333
• Line width 1.5 px, marker 6 px diameter, marker alpha 0.8
• Tableau-10 color cycle