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/// Tooltip overlay for radar (spider) charts with euclidean distance hit-testing
use leptos::prelude::*;
use lodviz_core::core::theme::Margin;
/// Tooltip data for a single radar series
#[derive(Clone, Debug, PartialEq)]
pub struct RadarTooltipSeries {
/// Series name shown in header
pub name: String,
/// Series color (hex string)
pub color: String,
/// Pixel-space coordinates of each vertex (one per axis)
pub vertices: Vec<(f64, f64)>,
/// Raw data values (one per axis)
pub values: Vec<f64>,
}
/// Tooltip overlay for radar charts
///
/// Hit-tests by finding the series vertex nearest to the mouse cursor
/// within 25% of the radar radius.
#[component]
pub fn RadarTooltip(
/// All radar series with pre-computed pixel vertices
series: Memo<Vec<RadarTooltipSeries>>,
/// Axis labels (static, one per spoke)
axes: Vec<String>,
/// Pixel radius of the outermost ring
radius: Memo<f64>,
/// Inner width of the chart area
inner_width: Memo<f64>,
/// Inner height of the chart area
inner_height: Memo<f64>,
/// Chart margins (to correct SVG offset coordinates)
margin: Memo<Margin>,
/// Tooltip background color
#[prop(into, optional)]
tooltip_bg: Option<Signal<String>>,
/// Tooltip text color
#[prop(into, optional)]
tooltip_text: Option<Signal<String>>,
) -> impl IntoView {
let tooltip_bg = move || {
tooltip_bg
.map(|s| s.get())
.unwrap_or_else(|| "rgba(0,0,0,0.85)".to_string())
};
let tooltip_text = move || {
tooltip_text
.map(|s| s.get())
.unwrap_or_else(|| "#ffffff".to_string())
};
let (mouse_pos, set_mouse_pos) = signal(None::<(f64, f64)>);
// Find the series whose nearest vertex is within 25% of radius
let hovered_series = Memo::new(move |_| {
let (mx, my) = mouse_pos.get()?;
let all = series.get();
let max_dist_sq = (radius.get() * 0.25).powi(2);
all.iter()
.enumerate()
.flat_map(|(i, s)| {
s.vertices
.iter()
.map(move |&(vx, vy)| (i, (vx - mx).powi(2) + (vy - my).powi(2)))
})
.filter(|&(_, d)| d < max_dist_sq)
.min_by(|a, b| a.1.partial_cmp(&b.1).unwrap_or(std::cmp::Ordering::Equal))
.map(|(i, _)| i)
});
let n_axes = axes.len();
view! {
// Transparent overlay to capture mouse events
<rect
width=move || inner_width.get()
height=move || inner_height.get()
fill="transparent"
style="pointer-events: all;"
on:mousemove=move |ev| {
let m = margin.get();
let x = ev.offset_x() as f64 - m.left;
let y = ev.offset_y() as f64 - m.top;
set_mouse_pos.set(Some((x, y)));
}
on:mouseleave=move |_| {
set_mouse_pos.set(None);
}
/>
// Tooltip rendering (pointer-events disabled)
{move || {
let si = hovered_series.get()?;
let (mx, my) = mouse_pos.get()?;
let all = series.get();
let s = all.get(si)?;
let w = inner_width.get();
let h = inner_height.get();
let pts_str: String = s
.vertices
.iter()
.map(|(x, y)| format!("{x:.2},{y:.2}"))
.collect::<Vec<_>>()
.join(" ");
let box_w = 160.0_f64;
let padding = 8.0_f64;
let header_h = 18.0_f64;
let row_h = 16.0_f64;
let box_h = padding * 2.0 + header_h + n_axes as f64 * row_h;
let box_x = if mx + box_w + 10.0 > w { mx - box_w - 10.0 } else { mx + 10.0 };
let box_y = if my + box_h + 10.0 > h { my - box_h - 10.0 } else { my + 10.0 };
let name = s.name.clone();
let color = s.color.clone();
let values = s.values.clone();
Some(
// Build polygon points string for the hovered series highlight
// Tooltip box sizing
// Auto-flip near edges
view! {
<g class="radar-tooltip-overlay" style="pointer-events: none;">
// Hovered polygon highlight (thicker stroke, semi-transparent)
<polygon
points=pts_str
fill=format!("{}22", color)
stroke=color.clone()
stroke-width="3"
stroke-linejoin="round"
opacity="0.8"
/>
// Tooltip box background
<rect
x=format!("{box_x:.2}")
y=format!("{box_y:.2}")
width=box_w
height=box_h
rx="4"
fill=tooltip_bg()
/>
// Left color stripe
<rect
x=format!("{box_x:.2}")
y=format!("{box_y:.2}")
width="3"
height=box_h
rx="4"
fill=color.clone()
/>
// Header: series name
<text
x=format!("{:.2}", box_x + padding)
y=format!("{:.2}", box_y + padding + 12.0)
font-size="11"
fill=tooltip_text()
font-family="'JetBrains Mono', monospace"
font-weight="bold"
>
{name}
</text>
// Axis value rows
{axes
.iter()
.enumerate()
.map(|(i, axis_label)| {
let val = values.get(i).copied().unwrap_or(0.0);
let ty = box_y + padding + header_h + row_h * (i as f64 + 1.0);
view! {
<text
x=format!("{:.2}", box_x + padding)
y=format!("{ty:.2}")
font-size="10"
fill="#ddd"
font-family="'JetBrains Mono', monospace"
>
{format!("{}: {val:.2}", axis_label)}
</text>
}
})
.collect_view()}
</g>
},
)
}}
}
}