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use crate::charts::{
render_axes_and_grid, ChartPoint, ChartSeries, CHART_PALETTE, H, PAD_B, PAD_L, PAD_R, PAD_T, W,
};
use leptos::prelude::*;
#[derive(Clone, Debug, PartialEq, Default)]
pub enum BarVariant {
#[default]
Default,
Horizontal,
Stacked,
Grouped,
}
#[component]
pub fn BarChart(
data: Vec<ChartPoint>,
#[prop(optional, into)] series: Vec<ChartSeries>,
#[prop(default = BarVariant::Default)] variant: BarVariant,
#[prop(default = String::new())] class: String,
) -> impl IntoView {
// Normalise: if series is empty, wrap `data` as one series.
let all_series: Vec<ChartSeries> = if series.is_empty() {
vec![ChartSeries {
points: data.clone(),
}]
} else {
series.clone()
};
let plot_w = W - PAD_L - PAD_R;
let plot_h = H - PAD_T - PAD_B;
let bottom = PAD_T + plot_h;
if all_series.is_empty() || all_series[0].points.is_empty() {
return view! {
<svg viewBox="0 0 320 200" class=format!("w-full h-auto {}", class)></svg>
}
.into_any();
}
let n = all_series[0].points.len();
let num_series = all_series.len();
let content: AnyView =
match variant {
BarVariant::Default => {
let s = &all_series[0];
let max_val = s
.points
.iter()
.map(|p| p.value)
.fold(0.0_f64, f64::max)
.max(1.0);
let slot = plot_w / n as f64;
let bar_w = slot * 0.6;
let gap = slot * 0.2;
let bars: Vec<_> = s
.points
.iter()
.enumerate()
.map(|(i, p)| {
let bar_h = (p.value / max_val) * plot_h;
let x = PAD_L + gap + i as f64 * slot;
let y = bottom - bar_h;
let label = p.label.clone();
view! {
<>
<rect x=format!("{x:.1}") y=format!("{y:.1}")
width=format!("{bar_w:.1}") height=format!("{bar_h:.1}")
fill="hsl(var(--primary))" rx="2" />
<text x=format!("{:.1}", x + bar_w / 2.0)
y=format!("{:.1}", H - 6.0)
text-anchor="middle" font-size="8"
class="fill-muted-foreground">{label}</text>
</>
}
})
.collect();
view! {
<>
{render_axes_and_grid()}
{bars}
</>
}
.into_any()
}
BarVariant::Horizontal => {
let s = &all_series[0];
let max_val = s
.points
.iter()
.map(|p| p.value)
.fold(0.0_f64, f64::max)
.max(1.0);
let slot = plot_h / n as f64;
let bar_h = slot * 0.6;
let gap = slot * 0.2;
// Vertical gridlines on the value (x) axis
let h_gridlines: Vec<_> = (1..=4)
.map(|i| {
let x = PAD_L + plot_w * (i as f64 / 4.0);
view! {
<line
x1=format!("{x:.1}") y1=PAD_T.to_string()
x2=format!("{x:.1}") y2=format!("{bottom:.1}")
stroke="currentColor" stroke-width="0.5"
class="text-border" stroke-dasharray="3,3"
/>
}
})
.collect();
let bars: Vec<_> = s
.points
.iter()
.enumerate()
.map(|(i, p)| {
let bar_len = (p.value / max_val) * plot_w;
let y = PAD_T + gap + i as f64 * slot;
let label = p.label.clone();
view! {
<>
<rect x=format!("{PAD_L:.1}") y=format!("{y:.1}")
width=format!("{bar_len:.1}") height=format!("{bar_h:.1}")
fill="hsl(var(--primary))" rx="2" />
<text x=format!("{:.1}", PAD_L - 3.0)
y=format!("{:.1}", y + bar_h / 2.0 + 3.0)
text-anchor="end" font-size="8"
class="fill-muted-foreground">{label}</text>
</>
}
})
.collect();
view! {
<>
{h_gridlines}
<line x1=PAD_L.to_string() y1=format!("{bottom:.1}")
x2=(W - PAD_R).to_string() y2=format!("{bottom:.1}")
stroke="currentColor" stroke-width="1" class="text-border" />
<line x1=PAD_L.to_string() y1=PAD_T.to_string()
x2=PAD_L.to_string() y2=format!("{bottom:.1}")
stroke="currentColor" stroke-width="1" class="text-border" />
{bars}
</>
}
.into_any()
}
BarVariant::Stacked => {
let max_val = (0..n)
.map(|i| {
all_series
.iter()
.map(|s| s.points.get(i).map(|p| p.value).unwrap_or(0.0))
.sum::<f64>()
})
.fold(0.0_f64, f64::max)
.max(1.0);
let slot = plot_w / n as f64;
let bar_w = slot * 0.6;
let gap = slot * 0.2;
let mut all_rects: Vec<AnyView> = Vec::new();
let x_labels: Vec<_> = all_series[0]
.points
.iter()
.enumerate()
.map(|(i, p)| {
let x = PAD_L + gap + i as f64 * slot;
let label = p.label.clone();
view! {
<text x=format!("{:.1}", x + bar_w / 2.0)
y=format!("{:.1}", H - 6.0)
text-anchor="middle" font-size="8"
class="fill-muted-foreground">{label}</text>
}
})
.collect();
for i in 0..n {
let mut y_cursor = bottom;
for si in 0..num_series {
let v = all_series[si].points.get(i).map(|p| p.value).unwrap_or(0.0);
let bar_h = (v / max_val) * plot_h;
let x = PAD_L + gap + i as f64 * slot;
let y = y_cursor - bar_h;
let color = CHART_PALETTE[si % CHART_PALETTE.len()].to_string();
all_rects.push(
view! {
<rect x=format!("{x:.1}") y=format!("{y:.1}")
width=format!("{bar_w:.1}") height=format!("{bar_h:.1}")
fill=color rx="2" />
}
.into_any(),
);
y_cursor = y;
}
}
view! {
<>
{render_axes_and_grid()}
{all_rects}
{x_labels}
</>
}
.into_any()
}
BarVariant::Grouped => {
let max_val = all_series
.iter()
.flat_map(|s| s.points.iter().map(|p| p.value))
.fold(0.0_f64, f64::max)
.max(1.0);
let slot = plot_w / n as f64;
let group_w = slot * 0.8;
let group_gap = slot * 0.1;
let sub_w = group_w / num_series as f64;
let mut all_rects: Vec<AnyView> = Vec::new();
let x_labels: Vec<_> = all_series[0]
.points
.iter()
.enumerate()
.map(|(i, p)| {
let group_x = PAD_L + group_gap + i as f64 * slot;
let label = p.label.clone();
view! {
<text x=format!("{:.1}", group_x + group_w / 2.0)
y=format!("{:.1}", H - 6.0)
text-anchor="middle" font-size="8"
class="fill-muted-foreground">{label}</text>
}
})
.collect();
for i in 0..n {
let group_x = PAD_L + group_gap + i as f64 * slot;
for si in 0..num_series {
let v = all_series[si].points.get(i).map(|p| p.value).unwrap_or(0.0);
let bar_h = (v / max_val) * plot_h;
let x = group_x + si as f64 * sub_w;
let y = bottom - bar_h;
let color = CHART_PALETTE[si % CHART_PALETTE.len()].to_string();
all_rects.push(view! {
<rect x=format!("{x:.1}") y=format!("{y:.1}")
width=format!("{:.1}", sub_w * 0.85) height=format!("{bar_h:.1}")
fill=color rx="2" />
}.into_any());
}
}
view! {
<>
{render_axes_and_grid()}
{all_rects}
{x_labels}
</>
}
.into_any()
}
};
view! {
<svg viewBox="0 0 320 200" class=format!("w-full h-auto {}", class) aria-hidden="true">
{content}
</svg>
}
.into_any()
}