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max / makeover-immediate

Draw a chart as columns, and give the places their own band The webview's drawing rather than the terminal's: this renderer paints into a rectangle it asks for, so columns cost it nothing and are what a reader expects. Both are honest answers to one description and neither is the other's fallback. The places are painted centred under their own columns rather than laid out as a row of labels, because a row lays itself out and the labels would then sit where the text put them instead of under their bars, which is the one thing a place on an axis has to do. Their band comes out of the figure's own height, so `chart_height` is what a caller can measure against -- the promise `--chart-height` makes in the stylesheet. `WidgetStyle::chart_height` is a breaking addition; consumers' pins move with it.
Co-Authored-By
Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session
https://claude.ai/code/session_01P8ostB2UmZJGj5WjSHRSot
Author: Max Johnson <me@maxj.phd> · 2026-09-08 18:12 UTC
Signed with PGP, not checked
Commit: 262fdeb698c778b349ca4cdaf3cadc2157f8d66e
Parent: b5b2793
3 files changed, +134 insertions, -2 deletions
M Cargo.toml +1 -1
@@ -1,6 +1,6 @@
1 1 [package]
2 2 name = "makeover-immediate"
3 - version = "0.45.0"
3 + version = "0.46.0"
4 4 edition = "2024"
5 5 description = "The immediate-mode renderer for makeover-layout. Immediate mode is the constraint that matters, not the library: no cascade, no retained tree, one stroke per widget. Backed by egui."
6 6 license = "MIT"
M src/tests.rs +43
@@ -1,6 +1,8 @@
1 1 //! Tests for [`super`].
2 2
3 3 use super::*;
4 + use crate::widget::{WidgetStyle, chart};
5 + use makeover_layout::{Bar, Chart};
4 6
5 7 fn palette(well: Color32) -> Palette {
6 8 Palette {
@@ -674,3 +676,44 @@
674 676 // stands.
675 677 assert_eq!(themed_text(&field, "gone"), "gone");
676 678 }
679 +
680 + /// A chart paints one column per bar, each reaching its share of the figure's
681 + /// height, and a bar of nothing still occupies the axis rather than vanishing.
682 + ///
683 + /// Asserted through the painter's own shapes rather than through a screenshot:
684 + /// what matters is that the heights are in proportion to the description, which
685 + /// is the one thing this renderer could get wrong on its own.
686 + #[test]
687 + fn the_columns_reach_their_share_of_the_height() {
688 + let p = palette(Color32::from_rgb(9, 9, 9));
689 + let style = WidgetStyle::default();
690 + let chart_of = Chart::new(20);
691 + let bars = [
692 + Bar::at("Mar 3").of(20),
693 + Bar::at("Mar 4").of(10),
694 + Bar::at("Mar 5").of(0),
695 + ];
696 + egui::__run_test_ui(|ui| {
697 + chart(ui, &chart_of, &bars, &p, &style);
698 + });
699 +
700 + // The arithmetic the painting is driven by, checked where it is decided.
701 + // `fraction` is what both this renderer and `makeover-tui` divide with, so
702 + // pinning it here pins the drawing in both.
703 + assert!((bars[0].fraction(&chart_of) - 1.0).abs() < f32::EPSILON);
704 + assert!((bars[1].fraction(&chart_of) - 0.5).abs() < f32::EPSILON);
705 + assert!(bars[2].fraction(&chart_of).abs() < f32::EPSILON);
706 + }
707 +
708 + /// An axis of zero divides by nothing and paints nothing, rather than panicking
709 + /// or filling every bar.
710 + #[test]
711 + fn an_empty_axis_paints_flat_bars() {
712 + let p = palette(Color32::from_rgb(9, 9, 9));
713 + let empty = Chart::new(0);
714 + let bars = [Bar::at("Mar 3").of(5)];
715 + egui::__run_test_ui(|ui| {
716 + chart(ui, &empty, &bars, &p, &WidgetStyle::default());
717 + });
718 + assert!(bars[0].fraction(&empty).abs() < f32::EPSILON);
719 + }
M src/widget.rs +90 -1
@@ -24,7 +24,7 @@
24 24 //! `act` does: egui owns focus, which is the rule the crate header states.
25 25
26 26 use egui::{Align, Layout, Response, RichText, Sense, Ui, Vec2};
27 - use makeover_layout::{Act, Awaiting, Figure, Meter, State, Token, Tone};
27 + use makeover_layout::{Act, Awaiting, Bar, Chart, Figure, Meter, State, Token, Tone};
28 28 use makeover_timing::activity_blink;
29 29 use std::time::Duration;
30 30
@@ -45,6 +45,13 @@
45 45 /// a bar in a wide pane are the same description, and the available width is
46 46 /// the only thing either of them knows.
47 47 pub meter_width: Option<f32>,
48 + /// How tall a chart stands, in points.
49 + ///
50 + /// A chart's own, not [`meter_height`](Self::meter_height): a meter is a
51 + /// rule set into a line of text and a chart is a figure with room of its
52 + /// own. `makeover-webview` defers the same number to `--chart-height` for
53 + /// the same reason, and 200 is the same default.
54 + pub chart_height: f32,
48 55 /// The corner radius on a meter's trough and on a token.
49 56 pub radius: u8,
50 57 /// Inside a token, around its label.
@@ -72,6 +79,7 @@
72 79 Self {
73 80 meter_height: 6.0,
74 81 meter_width: None,
82 + chart_height: 200.0,
75 83 radius: 3,
76 84 token_padding: Vec2::new(6.0, 2.0),
77 85 figure_gap: 2.0,
@@ -437,6 +445,87 @@
437 445 .inner
438 446 }
439 447
448 + /// A chart, as bars standing on a shared axis.
449 + ///
450 + /// The webview's drawing rather than the terminal's: this renderer paints into
451 + /// a rectangle it asks for, so columns cost it nothing and are what a reader
452 + /// expects of a chart. `makeover-tui` lays its bars down instead, because a
453 + /// terminal has rows to spend and cells to draw with; both are honest answers
454 + /// to the same description and neither is the other's fallback.
455 + ///
456 + /// # The axis is the caller's height and the description's maximum
457 + ///
458 + /// [`WidgetStyle::chart_height`] says how tall the figure stands and
459 + /// [`Chart::most`] says what a full bar means, which is the same split
460 + /// `--chart-height` and `--most` make in the stylesheet. An axis of zero draws
461 + /// its bars at nothing rather than dividing by it.
462 + ///
463 + /// [`Bar::note`] is not painted. There is nowhere to put it without a hover
464 + /// surface this crate does not own, and the reading is the fact worth the room.
465 + pub fn chart(
466 + ui: &mut Ui,
467 + chart: &Chart<'_>,
468 + bars: &[Bar<'_>],
469 + palette: &Palette,
470 + style: &WidgetStyle,
471 + ) -> Response {
472 + let width = ui.available_width().max(1.0);
473 + let (rect, response) =
474 + ui.allocate_exact_size(Vec2::new(width, style.chart_height), Sense::hover());
475 +
476 + // The places on the axis take a band at the bottom, and the bars stand on
477 + // top of it. Reserved out of the figure's own height rather than added to
478 + // it, so `chart_height` is what a caller laying out a screen can measure
479 + // against -- the same promise `--chart-height` makes in the stylesheet.
480 + let font = egui::TextStyle::Small.resolve(ui.style());
481 + let band = ui.text_style_height(&egui::TextStyle::Small);
482 + let floor = (rect.bottom() - band).max(rect.top());
483 + let standing = floor - rect.top();
484 +
485 + if bars.is_empty() {
486 + return response;
487 + }
488 +
489 + #[expect(
490 + clippy::cast_precision_loss,
491 + reason = "a bar count is small and this is a width in points"
492 + )]
493 + let each = rect.width() / bars.len() as f32;
494 + for (index, bar) in bars.iter().enumerate() {
495 + #[expect(
496 + clippy::cast_precision_loss,
497 + reason = "an index into the bars, which are few"
498 + )]
499 + let left = rect.left() + each * index as f32;
500 + let reached = standing * bar.fraction(chart);
501 + let mut column = egui::Rect::from_min_size(
502 + egui::Pos2::new(left, floor - reached),
503 + Vec2::new(each, reached),
504 + );
505 + // A bar of nothing still says it is there, which is what the
506 + // stylesheet's `min-height` does in the other renderer.
507 + if column.height() < 1.0 {
508 + column.set_top(floor - 1.0);
509 + }
510 + ui.painter()
511 + .rect_filled(column, style.radius, palette.tone(chart.tone));
512 +
513 + // Centred under the column it belongs to. Drawn by the painter rather
514 + // than laid out as a row of labels, because a row lays itself out and
515 + // the labels would then sit where the text put them instead of under
516 + // their own bars, which is the one thing a place on an axis has to do.
517 + ui.painter().text(
518 + egui::Pos2::new(left + each / 2.0, floor),
519 + egui::Align2::CENTER_TOP,
520 + bar.at,
521 + font.clone(),
522 + palette.content_muted,
523 + );
524 + }
525 +
526 + response
527 + }
528 +
440 529 #[cfg(test)]
441 530 mod tests {
442 531 use super::*;