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Measure width and decide on chunk height

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The chunk height was tested by printing a widget with height 1200 and
continuous vertical lines. It printed perfectly and in one go.
This commit is contained in:
Joscha 2024-03-09 01:26:17 +01:00
parent 2c8f9685b9
commit aff5b4974e
2 changed files with 17 additions and 11 deletions
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13
showbits-thermal-printer/src/drawer.rs
View file

@ -1,8 +1,9 @@
use cosmic_text::{Attrs, Metrics}; use cosmic_text::{Attrs, Metrics};
use palette::Srgba; use palette::Srgba;
use showbits_common::{ use showbits_common::{
color,
widgets::{Block, FontStuff, HasFontStuff, Text}, widgets::{Block, FontStuff, HasFontStuff, Text},
Node, Tree, WidgetExt, Tree, WidgetExt,
}; };
use taffy::style_helpers::{length, percent}; use taffy::style_helpers::{length, percent};
use tokio::sync::mpsc; use tokio::sync::mpsc;
@ -80,19 +81,17 @@ impl Drawer {
.register(&mut tree)?; .register(&mut tree)?;
let wrap = Block::new() let wrap = Block::new()
.background(Srgba::new(0.0, 1.0, 0.0, 0.3)) .border(color::BLACK)
.node() .node()
.border_all(length(2.0))
.child(text) .child(text)
.register(&mut tree)?; .register(&mut tree)?;
let root = Block::new() let root = Block::new()
.border(Srgba::new(1.0, 0.0, 0.0, 0.5)) .border(color::BLACK)
.node() .node()
.size_width(percent(1.0)) .size_width(percent(1.0))
.border_top(length(5.0)) .border_all(length(2.0))
.border_right(length(10.0))
.border_bottom(length(15.0))
.border_left(length(20.0))
.padding_all(length(10.0)) .padding_all(length(10.0))
.child(wrap) .child(wrap)
.register(&mut tree)?; .register(&mut tree)?;

15
showbits-thermal-printer/src/printer.rs
View file

@ -23,13 +23,20 @@ impl Printer {
const PAGE_CODE: PageCode = PageCode::PC437; const PAGE_CODE: PageCode = PageCode::PC437;
/// Width of the printable area in pixels. /// Width of the printable area in pixels.
// TODO Figure out actual width ///
const WIDTH: u32 = 8 * 32; /// Assumed to be a multiple of 8, then measured to that precision.
const WIDTH: u32 = 8 * 48;
/// Images are printed in chunks because a single print command can only /// Images are printed in chunks because a single print command can only
/// print so much data. /// print so much data.
// TODO Figure out sensible chunk height ///
const CHUNK_HEIGHT: u32 = 42; /// Looking at the [epson docs][0], most printers seem to support a max
/// height of 2303, though some go up to 4095. Because I don't want to waste
/// a bunch of paper trying various different heights, I'll go with 1023
/// because it's nice and round and slightly conservative.
///
/// [0]: https://download4.epson.biz/sec_pubs/pos/reference_en/escpos/gs_lv_0.html
const CHUNK_HEIGHT: u32 = 0b0000_0011_1111_1111;
pub fn new( pub fn new(
printer_path: Option<PathBuf>, printer_path: Option<PathBuf>,