Struct DensityCanvas 

pub struct DensityCanvas { /* private fields */ }

A 1x2 pixel-per-character canvas that counts hits per cell and renders density using shade block characters (░▒▓█).

Implementations

impl DensityCanvas

pub fn new( char_width: usize, char_height: usize, origin_x: f64, origin_y: f64, plot_width: f64, plot_height: f64, ) -> Self

Creates a density canvas with identity axis scales.

Panics

Panics when either axis transform cannot be constructed. This occurs if plot spans are non-positive, pixel dimensions are zero, or origins are non-finite.

Trait Implementations

impl Canvas for DensityCanvas

fn pixel(&mut self, x: usize, y: usize, color: CanvasColor)

Sets a single pixel at the given pixel coordinates.

fn glyph_at(&self, col: usize, row: usize) -> char

Returns the Unicode glyph for the character cell at (col, row).

fn color_at(&self, col: usize, row: usize) -> CanvasColor

Returns the composited color for the character cell at (col, row).

fn char_width(&self) -> usize

The number of character columns in this canvas.

fn char_height(&self) -> usize

The number of character rows in this canvas.

fn pixel_width(&self) -> usize

The total pixel width (character columns times pixels per character).

fn pixel_height(&self) -> usize

The total pixel height (character rows times pixels per character).

fn transform(&self) -> &Transform2D

Returns a reference to this canvas’s coordinate transform.

fn transform_mut(&mut self) -> &mut Transform2D

Returns a mutable reference to this canvas’s coordinate transform.

fn point(&mut self, x: f64, y: f64, color: CanvasColor)

Plots a single data-space point, transforming it to pixel coordinates.

fn points(&mut self, xs: &[f64], ys: &[f64], color: CanvasColor)

Plots multiple data-space points. Silently ignores mismatched lengths.

fn line(&mut self, x1: f64, y1: f64, x2: f64, y2: f64, color: CanvasColor)

Draws a line between two data-space points using DDA rasterization.

fn lines(&mut self, xs: &[f64], ys: &[f64], color: CanvasColor)

Draws connected line segments through consecutive point pairs.

fn row_cells( &self, row: usize, ) -> impl Iterator<Item = (char, CanvasColor)> + '_

Iterates over (glyph, color) pairs for all cells in a character row.

impl Clone for DensityCanvas

fn clone(&self) -> DensityCanvas

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for DensityCanvas

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

Formats the value using the given formatter.

impl PartialEq for DensityCanvas

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for DensityCanvas