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egui_plot: customizable spacing of grid and axis label spacing (#3896)

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This lets users specify the spacing of the grid lines and the axis
labels, as well as when these start to fade out.

New:
* `AxisHints::new_x/new_y` (replaces `::default()`)
* `AxisHints::label_spacing`
* `Plot::grid_spacing`
This commit is contained in:
Emil Ernerfeldt
2024-01-26 13:36:49 +01:00
committed by GitHub
parent 6b0782c96b
commit 5d0bc2bf7d
3 changed files with 239 additions and 190 deletions
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32
crates/egui_demo_lib/src/demo/plot_demo.rs
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@@ -530,23 +530,27 @@ impl CustomAxesDemo {
100.0 * y
}
let x_fmt = |x, _digits, _range: &RangeInclusive<f64>| {
if x < 0.0 * MINS_PER_DAY || x >= 5.0 * MINS_PER_DAY {
let time_formatter = |mark: GridMark, _digits, _range: &RangeInclusive<f64>| {
let minutes = mark.value;
if minutes < 0.0 || 5.0 * MINS_PER_DAY <= minutes {
// No labels outside value bounds
String::new()
} else if is_approx_integer(x / MINS_PER_DAY) {
} else if is_approx_integer(minutes / MINS_PER_DAY) {
// Days
format!("Day {}", day(x))
format!("Day {}", day(minutes))
} else {
// Hours and minutes
format!("{h}:{m:02}", h = hour(x), m = minute(x))
format!("{h}:{m:02}", h = hour(minutes), m = minute(minutes))
}
};
let y_fmt = |y, _digits, _range: &RangeInclusive<f64>| {
// Display only integer percentages
if !is_approx_zero(y) && is_approx_integer(100.0 * y) {
format!("{:.0}%", percent(y))
let percentage_formatter = |mark: GridMark, _digits, _range: &RangeInclusive<f64>| {
let percent = 100.0 * mark.value;
if is_approx_zero(percent) {
String::new() // skip zero
} else if is_approx_integer(percent) {
// Display only integer percentages
format!("{percent:.0}%")
} else {
String::new()
}
@@ -565,15 +569,15 @@ impl CustomAxesDemo {
ui.label("Zoom in on the X-axis to see hours and minutes");
let x_axes = vec![
AxisHints::default().label("Time").formatter(x_fmt),
AxisHints::default().label("Value"),
AxisHints::new_x().label("Time").formatter(time_formatter),
AxisHints::new_x().label("Value"),
];
let y_axes = vec![
AxisHints::default()
AxisHints::new_y()
.label("Percent")
.formatter(y_fmt)
.formatter(percentage_formatter)
.max_digits(4),
AxisHints::default()
AxisHints::new_y()
.label("Absolute")
.placement(egui_plot::HPlacement::Right),
];