Struct CharCanvas 

pub struct CharCanvas { /* private fields */ }

Implementations

impl CharCanvas

pub fn new() -> Self

pub fn put(&mut self, x: i64, y: i64, char: char, style: CanvasStyle)

Place a single character, merging box-drawing connectivity.

pub fn text(&mut self, x: i64, y: i64, value: &str, style: CanvasStyle)

Write a text run left to right (labels, node lines).

pub fn text_if_empty( &mut self, x: i64, y: i64, value: &str, style: CanvasStyle, ) -> bool

Write text only when every target cell is empty. Returns whether the text was written.

pub fn text_over_run( &mut self, x: i64, y: i64, value: &str, style: CanvasStyle, ) -> bool

Write text over a plain horizontal run, replacing ─ cells only. Refuses unless every target cell and both flanking cells are exactly ─. Spaces in value become real blanks on purpose.

pub fn fill_rect( &mut self, x: i64, y: i64, width: i64, height: i64, style: CanvasStyle, )

Fill a rectangle with intentional styled spaces. Unlike put, this preserves spaces so node cards can carry a background color.

pub fn hline(&mut self, y: i64, x1: i64, x2: i64, style: CanvasStyle)

pub fn vline(&mut self, x: i64, y1: i64, y2: i64, style: CanvasStyle)

pub fn render_runs(&self) -> Vec<Vec<StyledRun>>

Render to rows of styled runs, gaps filled with plain spaces. Trailing whitespace is trimmed from every row.

pub fn render_plain(&self) -> Vec<String>

Render to plain text lines (trailing whitespace trimmed), matching the TypeScript renderer with colors disabled.

Trait Implementations

impl Default for CharCanvas

fn default() -> CharCanvas

Returns the “default value” for a type.