Enum Marker 

pub enum Marker {
    Braille,
    HalfBlock,
    Block,
    Bar,
    Quadrant,
    Sextant,
    Octant,
    Dot,
    Ascii(char),
}

How a Canvas layer, or a Dataset, marks what it draws.

On an ASCII-only console (see Charset) every marker but Ascii draws one glyph a cell: # for the blocks, * for the others.

Quadrant, Bar and HalfBlock draw with Block Elements, which every terminal font has. The sextants are in Symbols for Legacy Computing (Unicode 13) and the octants in its supplement (Unicode 16): a font without them shows a box or a blank in each cell, so check the fonts your users have before choosing them.

Variants

Braille

Braille dots, 2×4 a cell.

HalfBlock

Half blocks (▀, ▄, █), 1×2 a cell. A cell whose halves differ in colour shows the upper colour on the lower one.

Block

A full block, █, a cell.

Bar

A lower half block, ▄, a cell.

Quadrant

Quarters of a cell (▘, ▚, ▙, ..), 2×2 a cell.

Sextant

Sixths of a cell (🬀 to 🬻), 2×3 a cell.

Octant

Eighths of a cell (U+1CD00 to U+1CDE5), 2×4 a cell: as fine as Braille, and solid.

Dot

A dot, •, a cell.

Ascii(char)

The given character, a cell. One that is not one cell wide, or not printable ASCII on an ASCII console, becomes *.

Trait Implementations

impl Clone for Marker

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Marker

impl Debug for Marker

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

Formats the value using the given formatter.

impl Default for Marker

fn default() -> Self

Returns the “default value” for a type.

impl Eq for Marker

impl Hash for Marker

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for Marker

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for Marker