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Formatter for plot axis labels (#1130)

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* Fix Orientation not exposed, although there are public fields with its type

* Implement formatters for X/Y axis labels

* Use array instead of separate X/Y formatters

* Swap axis formatters if charts are horizontal

* Review suggestions
This commit is contained in:
Jan Haller
2022-01-24 22:34:00 +01:00
committed by GitHub
parent 3418eb5d35
commit 366f544655
5 changed files with 97 additions and 17 deletions
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37
egui_demo_lib/src/apps/demo/plot_demo.rs
View File

@@ -71,8 +71,8 @@ impl LineDemo {
ui.vertical(|ui| {
ui.style_mut().wrap = Some(false);
ui.checkbox(animate, "animate");
ui.checkbox(square, "square view")
ui.checkbox(animate, "Animate");
ui.checkbox(square, "Square view")
.on_hover_text("Always keep the viewport square.");
ui.checkbox(proportional, "Proportional data axes")
.on_hover_text("Tick are the same size on both axes.");
@@ -523,15 +523,40 @@ impl ChartsDemo {
.name("Set 4")
.stack_on(&[&chart1, &chart2, &chart3]);
let mut x_fmt: fn(f64) -> String = |val| {
if val >= 0.0 && val <= 4.0 && is_approx_integer(val) {
// Only label full days from 0 to 4
format!("Day {}", val)
} else {
// Otherwise return empty string (i.e. no label)
String::new()
}
};
let mut y_fmt: fn(f64) -> String = |val| {
let percent = 100.0 * val;
if is_approx_integer(percent) && !is_approx_zero(percent) {
// Only show integer percentages,
// and don't show at Y=0 (label overlaps with X axis label)
format!("{}%", percent)
} else {
String::new()
}
};
if !self.vertical {
chart1 = chart1.horizontal();
chart2 = chart2.horizontal();
chart3 = chart3.horizontal();
chart4 = chart4.horizontal();
std::mem::swap(&mut x_fmt, &mut y_fmt);
}
Plot::new("Stacked Bar Chart Demo")
.legend(Legend::default())
.x_axis_formatter(x_fmt)
.y_axis_formatter(y_fmt)
.data_aspect(1.0)
.show(ui, |plot_ui| {
plot_ui.bar_chart(chart1);
@@ -698,3 +723,11 @@ impl super::View for PlotDemo {
}
}
}
fn is_approx_zero(val: f64) -> bool {
val.abs() < 1e-6
}
fn is_approx_integer(val: f64) -> bool {
val.fract().abs() < 1e-6
}