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Allow setting a line's fill area's alpha channel #34

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merged 1 commit into from
Sep 30, 2024
+10 −1
Merged

Allow setting a line's fill area's alpha channel #34

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11 changes: 10 additions & 1 deletion egui_plot/src/items/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -427,6 +427,7 @@ pub struct Line {
pub(super) highlight: bool,
pub(super) allow_hover: bool,
pub(super) fill: Option<f32>,
pub(super) fill_alpha: f32,
pub(super) style: LineStyle,
id: Option<Id>,
}
Expand All @@ -440,6 +441,7 @@ impl Line {
highlight: false,
allow_hover: true,
fill: None,
fill_alpha: DEFAULT_FILL_ALPHA,
style: LineStyle::Solid,
id: None,
}
Expand Down Expand Up @@ -487,6 +489,13 @@ impl Line {
self
}

/// Set the fill area's alpha channel. Default is `0.05`.
#[inline]
pub fn fill_alpha(mut self, alpha: impl Into<f32>) -> Self {
self.fill_alpha = alpha.into();
self
}

/// Set the line's style. Default is `LineStyle::Solid`.
#[inline]
pub fn style(mut self, style: LineStyle) -> Self {
Expand Down Expand Up @@ -545,7 +554,7 @@ impl PlotItem for Line {
fill = None;
}
if let Some(y_reference) = fill {
let mut fill_alpha = DEFAULT_FILL_ALPHA;
let mut fill_alpha = self.fill_alpha;
if *highlight {
fill_alpha = (2.0 * fill_alpha).at_most(1.0);
}
Expand Down