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widgets_chart.rs
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use ratatui::{
backend::TestBackend,
buffer::Buffer,
layout::{Alignment, Rect},
style::{Color, Style},
symbols,
text::{self, Span},
widgets::{Axis, Block, Borders, Chart, Dataset, GraphType::Line},
Terminal,
};
use rstest::rstest;
fn create_labels<'a>(labels: &'a [&'a str]) -> Vec<Span<'a>> {
labels.iter().map(|l| Span::from(*l)).collect()
}
fn axis_test_case<'a, S>(width: u16, height: u16, x_axis: Axis, y_axis: Axis, lines: Vec<S>)
where
S: Into<text::Line<'a>>,
{
let backend = TestBackend::new(width, height);
let mut terminal = Terminal::new(backend).unwrap();
terminal
.draw(|f| {
let chart = Chart::new(vec![]).x_axis(x_axis).y_axis(y_axis);
f.render_widget(chart, f.size());
})
.unwrap();
let expected = Buffer::with_lines(lines);
terminal.backend().assert_buffer(&expected);
}
#[rstest]
#[case(0, 0)]
#[case(0, 1)]
#[case(1, 0)]
#[case(1, 1)]
#[case(2, 2)]
fn widgets_chart_can_render_on_small_areas(#[case] width: u16, #[case] height: u16) {
let backend = TestBackend::new(width, height);
let mut terminal = Terminal::new(backend).unwrap();
terminal
.draw(|f| {
let datasets = vec![Dataset::default()
.marker(symbols::Marker::Braille)
.style(Style::default().fg(Color::Magenta))
.data(&[(0.0, 0.0)])];
let chart = Chart::new(datasets)
.block(Block::default().title("Plot").borders(Borders::ALL))
.x_axis(
Axis::default()
.bounds([0.0, 0.0])
.labels(create_labels(&["0.0", "1.0"])),
)
.y_axis(
Axis::default()
.bounds([0.0, 0.0])
.labels(create_labels(&["0.0", "1.0"])),
);
f.render_widget(chart, f.size());
})
.unwrap();
}
#[test]
fn widgets_chart_handles_long_labels() {
let test_case = |x_labels, y_labels, x_alignment, lines| {
let mut x_axis = Axis::default().bounds([0.0, 1.0]);
if let Some((left_label, right_label)) = x_labels {
x_axis = x_axis
.labels(vec![Span::from(left_label), Span::from(right_label)])
.labels_alignment(x_alignment);
}
let mut y_axis = Axis::default().bounds([0.0, 1.0]);
if let Some((left_label, right_label)) = y_labels {
y_axis = y_axis.labels(vec![Span::from(left_label), Span::from(right_label)]);
}
axis_test_case(10, 5, x_axis, y_axis, lines);
};
test_case(
Some(("AAAA", "B")),
None,
Alignment::Left,
vec![
" ",
" ",
" ",
" ───────",
"AAA B",
],
);
test_case(
Some(("A", "BBBB")),
None,
Alignment::Left,
vec![
" ",
" ",
" ",
" ─────────",
"A BBBB",
],
);
test_case(
Some(("AAAAAAAAAAA", "B")),
None,
Alignment::Left,
vec![
" ",
" ",
" ",
" ───────",
"AAA B",
],
);
test_case(
Some(("A", "B")),
Some(("CCCCCCC", "D")),
Alignment::Left,
vec![
"D │ ",
" │ ",
"CCC│ ",
" └──────",
" A B",
],
);
test_case(
Some(("AAAAAAAAAA", "B")),
Some(("C", "D")),
Alignment::Center,
vec![
"D │ ",
" │ ",
"C │ ",
" └──────",
"AAAAAAA B",
],
);
test_case(
Some(("AAAAAAA", "B")),
Some(("C", "D")),
Alignment::Right,
vec![
"D│ ",
" │ ",
"C│ ",
" └────────",
" AAAAA B",
],
);
test_case(
Some(("AAAAAAA", "BBBBBBB")),
Some(("C", "D")),
Alignment::Right,
vec![
"D│ ",
" │ ",
"C│ ",
" └────────",
" AAAAABBBB",
],
);
}
#[test]
fn widgets_chart_handles_x_axis_labels_alignments() {
let test_case = |y_alignment, lines| {
let x_axis = Axis::default()
.labels(vec![Span::from("AAAA"), Span::from("B"), Span::from("C")])
.labels_alignment(y_alignment);
let y_axis = Axis::default();
axis_test_case(10, 5, x_axis, y_axis, lines);
};
test_case(
Alignment::Left,
vec![
" ",
" ",
" ",
" ───────",
"AAA B C",
],
);
test_case(
Alignment::Center,
vec![
" ",
" ",
" ",
" ────────",
"AAAA B C",
],
);
test_case(
Alignment::Right,
vec![
" ",
" ",
" ",
"──────────",
"AAA B C",
],
);
}
#[test]
fn widgets_chart_handles_y_axis_labels_alignments() {
let test_case = |y_alignment, lines| {
let x_axis = Axis::default().labels(create_labels(&["AAAAA", "B"]));
let y_axis = Axis::default()
.labels(create_labels(&["C", "D"]))
.labels_alignment(y_alignment);
axis_test_case(20, 5, x_axis, y_axis, lines);
};
test_case(
Alignment::Left,
vec![
"D │ ",
" │ ",
"C │ ",
" └───────────────",
"AAAAA B",
],
);
test_case(
Alignment::Center,
vec![
" D │ ",
" │ ",
" C │ ",
" └───────────────",
"AAAAA B",
],
);
test_case(
Alignment::Right,
vec![
" D│ ",
" │ ",
" C│ ",
" └───────────────",
"AAAAA B",
],
);
}
#[test]
fn widgets_chart_can_have_axis_with_zero_length_bounds() {
let backend = TestBackend::new(100, 100);
let mut terminal = Terminal::new(backend).unwrap();
terminal
.draw(|f| {
let datasets = vec![Dataset::default()
.marker(symbols::Marker::Braille)
.style(Style::default().fg(Color::Magenta))
.data(&[(0.0, 0.0)])];
let chart = Chart::new(datasets)
.block(Block::default().title("Plot").borders(Borders::ALL))
.x_axis(
Axis::default()
.bounds([0.0, 0.0])
.labels(create_labels(&["0.0", "1.0"])),
)
.y_axis(
Axis::default()
.bounds([0.0, 0.0])
.labels(create_labels(&["0.0", "1.0"])),
);
f.render_widget(
chart,
Rect {
x: 0,
y: 0,
width: 100,
height: 100,
},
);
})
.unwrap();
}
#[test]
fn widgets_chart_handles_overflows() {
let backend = TestBackend::new(80, 30);
let mut terminal = Terminal::new(backend).unwrap();
terminal
.draw(|f| {
let datasets = vec![Dataset::default()
.marker(symbols::Marker::Braille)
.style(Style::default().fg(Color::Magenta))
.data(&[
(1_588_298_471.0, 1.0),
(1_588_298_473.0, 0.0),
(1_588_298_496.0, 1.0),
])];
let chart = Chart::new(datasets)
.block(Block::default().title("Plot").borders(Borders::ALL))
.x_axis(
Axis::default()
.bounds([1_588_298_471.0, 1_588_992_600.0])
.labels(create_labels(&["1588298471.0", "1588992600.0"])),
)
.y_axis(
Axis::default()
.bounds([0.0, 1.0])
.labels(create_labels(&["0.0", "1.0"])),
);
f.render_widget(
chart,
Rect {
x: 0,
y: 0,
width: 80,
height: 30,
},
);
})
.unwrap();
}
#[test]
fn widgets_chart_can_have_empty_datasets() {
let backend = TestBackend::new(100, 100);
let mut terminal = Terminal::new(backend).unwrap();
terminal
.draw(|f| {
let datasets = vec![Dataset::default().data(&[]).graph_type(Line)];
let chart = Chart::new(datasets)
.block(
Block::default()
.title("Empty Dataset With Line")
.borders(Borders::ALL),
)
.x_axis(
Axis::default()
.bounds([0.0, 0.0])
.labels(create_labels(&["0.0", "1.0"])),
)
.y_axis(
Axis::default()
.bounds([0.0, 1.0])
.labels(create_labels(&["0.0", "1.0"])),
);
f.render_widget(
chart,
Rect {
x: 0,
y: 0,
width: 100,
height: 100,
},
);
})
.unwrap();
}
#[allow(clippy::too_many_lines)]
#[test]
fn widgets_chart_can_have_a_legend() {
let backend = TestBackend::new(60, 30);
let mut terminal = Terminal::new(backend).unwrap();
terminal
.draw(|f| {
let datasets = vec![
Dataset::default()
.name("Dataset 1")
.style(Style::default().fg(Color::Blue))
.data(&[
(0.0, 0.0),
(10.0, 1.0),
(20.0, 2.0),
(30.0, 3.0),
(40.0, 4.0),
(50.0, 5.0),
(60.0, 6.0),
(70.0, 7.0),
(80.0, 8.0),
(90.0, 9.0),
(100.0, 10.0),
])
.graph_type(Line),
Dataset::default()
.name("Dataset 2")
.style(Style::default().fg(Color::Green))
.data(&[
(0.0, 10.0),
(10.0, 9.0),
(20.0, 8.0),
(30.0, 7.0),
(40.0, 6.0),
(50.0, 5.0),
(60.0, 4.0),
(70.0, 3.0),
(80.0, 2.0),
(90.0, 1.0),
(100.0, 0.0),
])
.graph_type(Line),
];
let chart = Chart::new(datasets)
.style(Style::default().bg(Color::White))
.block(Block::default().title("Chart Test").borders(Borders::ALL))
.x_axis(
Axis::default()
.bounds([0.0, 100.0])
.title(Span::styled("X Axis", Style::default().fg(Color::Yellow)))
.labels(create_labels(&["0.0", "50.0", "100.0"])),
)
.y_axis(
Axis::default()
.bounds([0.0, 10.0])
.title("Y Axis")
.labels(create_labels(&["0.0", "5.0", "10.0"])),
);
f.render_widget(
chart,
Rect {
x: 0,
y: 0,
width: 60,
height: 30,
},
);
})
.unwrap();
let mut expected = Buffer::with_lines(vec![
"┌Chart Test────────────────────────────────────────────────┐",
"│10.0│Y Axis ┌─────────┐│",
"│ │ •• │Dataset 1││",
"│ │ •• │Dataset 2││",
"│ │ •• └─────────┘│",
"│ │ •• •• │",
"│ │ •• •• │",
"│ │ •• •• │",
"│ │ •• •• │",
"│ │ •• •• │",
"│ │ •• •• │",
"│ │ •• •• │",
"│ │ ••• •• │",
"│ │ ••• │",
"│5.0 │ •• •• │",
"│ │ •• •• │",
"│ │ ••• •• │",
"│ │ •• •• │",
"│ │ •• •• │",
"│ │ •• •• │",
"│ │ •• •• │",
"│ │ •• •• │",
"│ │ •• •• │",
"│ │ •• ••• │",
"│ │ •• •• │",
"│ │ •• •• │",
"│0.0 │• X Axis│",
"│ └─────────────────────────────────────────────────────│",
"│ 0.0 50.0 100.0│",
"└──────────────────────────────────────────────────────────┘",
]);
// Set expected background color
for row in 0..30 {
for col in 0..60 {
expected.get_mut(col, row).set_bg(Color::White);
}
}
// Set expected colors of the first dataset
let line1 = vec![
(48, 5),
(49, 5),
(46, 6),
(47, 6),
(44, 7),
(45, 7),
(42, 8),
(43, 8),
(40, 9),
(41, 9),
(38, 10),
(39, 10),
(36, 11),
(37, 11),
(34, 12),
(35, 12),
(33, 13),
(30, 14),
(31, 14),
(28, 15),
(29, 15),
(25, 16),
(26, 16),
(27, 16),
(23, 17),
(24, 17),
(21, 18),
(22, 18),
(19, 19),
(20, 19),
(17, 20),
(18, 20),
(15, 21),
(16, 21),
(13, 22),
(14, 22),
(11, 23),
(12, 23),
(9, 24),
(10, 24),
(7, 25),
(8, 25),
(6, 26),
];
let legend1 = vec![
(49, 2),
(50, 2),
(51, 2),
(52, 2),
(53, 2),
(54, 2),
(55, 2),
(56, 2),
(57, 2),
];
for (col, row) in line1 {
expected.get_mut(col, row).set_fg(Color::Blue);
}
for (col, row) in legend1 {
expected.get_mut(col, row).set_fg(Color::Blue);
}
// Set expected colors of the second dataset
let line2 = vec![
(8, 2),
(9, 2),
(10, 3),
(11, 3),
(12, 4),
(13, 4),
(14, 5),
(15, 5),
(16, 6),
(17, 6),
(18, 7),
(19, 7),
(20, 8),
(21, 8),
(22, 9),
(23, 9),
(24, 10),
(25, 10),
(26, 11),
(27, 11),
(28, 12),
(29, 12),
(30, 12),
(31, 13),
(32, 13),
(33, 14),
(34, 14),
(35, 15),
(36, 15),
(37, 16),
(38, 16),
(39, 17),
(40, 17),
(41, 18),
(42, 18),
(43, 19),
(44, 19),
(45, 20),
(46, 20),
(47, 21),
(48, 21),
(49, 22),
(50, 22),
(51, 23),
(52, 23),
(53, 23),
(54, 24),
(55, 24),
(56, 25),
(57, 25),
];
let legend2 = vec![
(49, 3),
(50, 3),
(51, 3),
(52, 3),
(53, 3),
(54, 3),
(55, 3),
(56, 3),
(57, 3),
];
for (col, row) in line2 {
expected.get_mut(col, row).set_fg(Color::Green);
}
for (col, row) in legend2 {
expected.get_mut(col, row).set_fg(Color::Green);
}
// Set expected colors of the x axis
let x_axis_title = vec![(53, 26), (54, 26), (55, 26), (56, 26), (57, 26), (58, 26)];
for (col, row) in x_axis_title {
expected.get_mut(col, row).set_fg(Color::Yellow);
}
terminal.backend().assert_buffer(&expected);
}
#[test]
fn widgets_chart_top_line_styling_is_correct() {
let backend = TestBackend::new(9, 5);
let mut terminal = Terminal::new(backend).unwrap();
let title_style = Style::default().fg(Color::Red).bg(Color::LightRed);
let data_style = Style::default().fg(Color::Blue);
terminal
.draw(|f| {
let data: [(f64, f64); 2] = [(0.0, 1.0), (1.0, 1.0)];
let widget = Chart::new(vec![Dataset::default()
.data(&data)
.graph_type(ratatui::widgets::GraphType::Line)
.style(data_style)])
.y_axis(
Axis::default()
.title(Span::styled("abc", title_style))
.bounds([0.0, 1.0])
.labels(create_labels(&["a", "b"])),
)
.x_axis(Axis::default().bounds([0.0, 1.0]));
f.render_widget(widget, f.size());
})
.unwrap();
let mut expected = Buffer::with_lines(vec![
"b│abc••••",
" │ ",
" │ ",
" │ ",
"a│ ",
]);
expected.set_style(Rect::new(2, 0, 3, 1), title_style);
expected.set_style(Rect::new(5, 0, 4, 1), data_style);
terminal.backend().assert_buffer(&expected);
}