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//! Sparkline plot layer — minimal line or bar marks.
use leptos::prelude::*;
use crate::context::{
set_hovered_item, use_chart_context, use_highlighted_item, use_x_scale, use_y_scale,
ChartInteractionContext, ChartTooltipContext,
};
use crate::engine::{
build_area_path, build_line_path, resolve_series_color, BarGeometry, PlotPoint,
};
use crate::{
ChartItemId, ChartScale, CurveType, FadeMode, HighlightMode, HighlightScope, SparklinePlotType,
TooltipTrigger,
};
fn scale_y(scale: &ChartScale, value: f64) -> f64 {
match scale {
ChartScale::Linear(l) => l.scale(value),
_ => value,
}
}
/// Renders sparkline line or bar marks without axis chrome.
#[component]
pub fn SparklinePlot(
/// Line or bar plot type.
#[prop(default = SparklinePlotType::Line)]
plot_type: SparklinePlotType,
/// Fill area under line (line mode only).
#[prop(default = false)]
area: bool,
/// Line curve interpolation.
#[prop(default = CurveType::Linear)]
curve: CurveType,
/// Optional series color override.
#[prop(default = None)]
color: Option<String>,
) -> impl IntoView {
let ctx = use_chart_context();
let interaction = expect_context::<ChartInteractionContext>();
let projected = ctx.projected.clone();
let series_defs = ctx.series.clone();
let palette = ctx.palette.clone();
let x_scale = use_x_scale("x");
let y_scale = use_y_scale("y");
let plot_height = ctx.drawing_area.plot_height;
let baseline_y = scale_y(&y_scale, 0.0);
let stroke_width = (plot_height / 28.0 * 1.5).clamp(1.5, 3.0);
let highlight_scope = ctx.highlight_scope.unwrap_or(HighlightScope {
highlight: HighlightMode::None,
fade: FadeMode::Global,
});
let show_markers = move || {
ctx.highlight_scope.is_some()
|| use_context::<ChartTooltipContext>()
.map(|tooltip| tooltip.trigger.get())
.is_some_and(|trigger| !matches!(trigger, TooltipTrigger::None))
};
let highlighted = use_highlighted_item();
view! {
{move || {
let Some(data) = projected.as_ref() else {
return ().into_any();
};
let markers_enabled = show_markers();
let Some(series) = data.series.first() else {
return ().into_any();
};
let series_id = series_defs
.first()
.map(|s| s.id.clone())
.unwrap_or_else(|| "sparkline".into());
let def = series_defs.first().cloned().unwrap_or_default();
let stroke_color = color.clone().unwrap_or_else(|| resolve_series_color(0, &def, &palette));
match plot_type {
SparklinePlotType::Bar => {
let bar_width = x_scale.bandwidth().unwrap_or(4.0) * 0.85;
let mut bars = Vec::new();
let marks = data
.categories
.iter()
.enumerate()
.map(|(i, cat)| {
let x_center = category_x(&x_scale, cat, i, data.categories.len());
let value = series.data.get(i).copied().unwrap_or(0.0);
let y_top = scale_y(&y_scale, value);
let bar_h = (baseline_y - y_top).max(0.0);
let bar_x = x_center - bar_width / 2.0;
bars.push(BarGeometry {
x: bar_x,
y: y_top,
width: bar_width,
height: bar_h,
series_id: series_id.clone(),
data_index: i,
value,
});
let item_id = ChartItemId {
series_id: series_id.clone(),
data_index: i,
};
let item_id_for_class = item_id.clone();
let mark_class = move || {
let mut classes = vec!["orb-sparkline-bar".to_string()];
let active = highlighted.get();
let is_active = active.as_ref() == Some(&item_id_for_class);
if highlight_scope.highlight != HighlightMode::None && active.is_some() {
if is_active {
classes.push("orb-sparkline-bar-highlighted".into());
} else if highlight_scope.fade == FadeMode::Global {
classes.push("orb-sparkline-bar-faded".into());
}
}
classes.join(" ")
};
view! {
<rect
class=mark_class
x=bar_x
y=y_top
width=bar_width
height=bar_h
fill=stroke_color.clone()
style="pointer-events: all;"
on:mouseenter=move |_| {
interaction.pointer_plot.set(Some((
ctx.drawing_area.left + x_center,
ctx.drawing_area.top + y_top + bar_h / 2.0,
)));
set_hovered_item(Some(item_id.clone()));
}
on:mouseleave=move |_| {
interaction.pointer_plot.set(None);
set_hovered_item(None);
}
/>
}
})
.collect_view();
interaction.plot_bars.set(bars);
marks.into_any()
}
SparklinePlotType::Line => {
let points: Vec<PlotPoint> = data
.categories
.iter()
.enumerate()
.map(|(i, cat)| {
let x = category_x(&x_scale, cat, i, data.categories.len());
let y_val = series.data.get(i).copied();
PlotPoint {
x,
y: y_val.map(|v| scale_y(&y_scale, v)),
}
})
.collect();
let line = build_line_path(&points, curve, false);
let path_d = line.d.clone();
let area_path = if area {
Some(build_area_path(&line, baseline_y))
} else {
None
};
let mut markers = Vec::new();
for (i, pt) in points.iter().enumerate() {
if let Some(y) = pt.y {
markers.push((pt.x, y, series_id.clone(), i));
}
}
interaction.plot_line_markers.set(markers);
let marker_views = markers_enabled.then(|| {
points
.iter()
.enumerate()
.filter_map(|(i, pt)| {
let y = pt.y?;
let item_id = ChartItemId {
series_id: series_id.clone(),
data_index: i,
};
let item_id_for_class = item_id.clone();
let cx = pt.x;
let cy = y;
let point_class = move || {
let mut classes = vec!["orb-sparkline-point".to_string()];
let active = highlighted.get();
let is_active = active.as_ref() == Some(&item_id_for_class);
if highlight_scope.highlight != HighlightMode::None && active.is_some() {
if is_active {
classes.push("orb-sparkline-point-highlighted".into());
} else if highlight_scope.fade == FadeMode::Global {
classes.push("orb-sparkline-point-faded".into());
}
}
classes.join(" ")
};
Some(view! {
<circle
class=point_class
cx=cx
cy=cy
r=stroke_width * 1.5
fill=stroke_color.clone()
style="pointer-events: all;"
on:mouseenter=move |_| {
interaction.pointer_plot.set(Some((
ctx.drawing_area.left + cx,
ctx.drawing_area.top + cy,
)));
set_hovered_item(Some(item_id.clone()));
}
on:mouseleave=move |_| {
interaction.pointer_plot.set(None);
set_hovered_item(None);
}
/>
})
})
.collect_view()
});
let line_item_id = ChartItemId {
series_id: series_id.clone(),
data_index: 0,
};
let line_class = move || {
let mut classes = vec!["orb-sparkline-line".to_string()];
let active = highlighted.get();
if highlight_scope.highlight != HighlightMode::None
&& active.is_some()
&& active.as_ref() != Some(&line_item_id)
&& highlight_scope.fade == FadeMode::Global
{
classes.push("orb-sparkline-line-faded".into());
}
classes.join(" ")
};
let first_hover = points.iter().find_map(|pt| {
pt.y.map(|y| (pt.x, y))
});
let series_for_line_hover = series_id.clone();
view! {
{area_path.map(|area_d| {
view! {
<path
class="orb-sparkline-area"
d=area_d
fill=stroke_color.clone()
fill-opacity="0.2"
/>
}
})}
{markers_enabled.then(|| {
first_hover.map(|(hx, hy)| {
view! {
<path
class="orb-sparkline-line-hit"
d=path_d.clone()
stroke="transparent"
stroke-width=(stroke_width * 10.0).max(12.0)
fill="none"
style="pointer-events: all;"
on:mouseenter=move |_| {
interaction.pointer_plot.set(Some((
ctx.drawing_area.left + hx,
ctx.drawing_area.top + hy,
)));
set_hovered_item(Some(ChartItemId {
series_id: series_for_line_hover.clone(),
data_index: 0,
}));
}
on:mouseleave=move |_| {
interaction.pointer_plot.set(None);
set_hovered_item(None);
}
/>
}
})
})}
<path
class=line_class
d=path_d
stroke=stroke_color.clone()
stroke-width=stroke_width
fill="none"
/>
{marker_views}
}
.into_any()
}
}
}}
}
}
fn category_x(scale: &ChartScale, category: &str, index: usize, count: usize) -> f64 {
match scale {
ChartScale::Band(b) => b.scale(category).unwrap_or_else(|| {
if count > 1 {
b.step() * index as f64 + b.bandwidth() / 2.0
} else {
b.bandwidth() / 2.0
}
}),
ChartScale::Linear(l) => l.scale(index as f64),
}
}