diff --git a/server/src/html/mod.rs b/server/src/html/mod.rs index a58cbbee3490a08a625cb06df06848c59a615d65..4eff2e19ed4d303ff8e80c1eabd8a15b4990e643 100644 --- a/server/src/html/mod.rs +++ b/server/src/html/mod.rs @@ -264,12 +264,19 @@ pub fn scope_theme_style(parent: &ItemId) -> String { ) } -fn rank_row_style(parent: &ItemId, ordinal: usize, total: usize) -> String { - let t = if total <= 1 { - 0.0 - } else { - ordinal as f64 / (total - 1) as f64 - }; +/// Map vote mass to gradient position using the group's score range, not raw mass or +/// list position. Vote mass sums to 1 across the component, so absolute values dilute +/// as N grows; min–max within the visible list preserves similar scores → similar colors. +fn score_gradient_t(score: f64, min_score: f64, max_score: f64) -> f64 { + let spread = max_score - min_score; + if spread < 1e-9 { + return 0.5; + } + ((max_score - score) / spread).clamp(0.0, 1.0) +} + +fn rank_row_style(parent: &ItemId, score: f64, min_score: f64, max_score: f64) -> String { + let t = score_gradient_t(score, min_score, max_score); let base_hue = scope_base_hue(parent); let hue = (base_hue + 118.0 * t) % 360.0; let lightness = 0.74 - 0.34 * t; @@ -295,14 +302,15 @@ fn rank_list( highlighted: &HashSet, tree: &GlobalTree, ) -> Markup { - let group_len = items.len(); + let min_score = items.iter().map(|r| r.score).fold(f64::INFINITY, f64::min); + let max_score = items.iter().map(|r| r.score).fold(f64::NEG_INFINITY, f64::max); html! { @if !items.is_empty() { h3 class="rank-heading muted small" { (label) } ol class="rank-list" { @for (i, r) in items.iter().enumerate() { @let href = item_href(&r.item); - @let style = rank_row_style(parent, i, group_len); + @let style = rank_row_style(parent, r.score, min_score, max_score); @let class = rank_row_class(&r.item, highlighted); li class=(class) data-rank-item=(r.item.as_str()) @@ -517,19 +525,37 @@ pub async fn browse(State(state): State, uri: Uri) -> impl IntoRespons #[cfg(test)] mod tests { - use super::{rank_row_style, SORTER_UI_JS}; + use super::{rank_row_style, score_gradient_t, SORTER_UI_JS}; use crate::path_types::ItemId; #[test] - fn rank_row_style_gradients_per_group_not_globally() { + fn score_gradient_t_uses_group_range_not_absolute_mass() { + assert!((score_gradient_t(0.12, 0.08, 0.12) - 0.0).abs() < 1e-9); + assert!((score_gradient_t(0.08, 0.08, 0.12) - 1.0).abs() < 1e-9); + // Raw 12% mass would map near the dark end globally; within this group it's the top. + assert!(score_gradient_t(0.12, 0.08, 0.12) < score_gradient_t(0.12, 0.0, 1.0)); + } + + #[test] + fn score_gradient_t_similar_scores_similar_t() { + let a = score_gradient_t(0.41, 0.20, 0.60); + let b = score_gradient_t(0.40, 0.20, 0.60); + assert!((a - b).abs() < 0.05); + assert!((a - score_gradient_t(0.60, 0.20, 0.60)).abs() > 0.3); + } + + #[test] + fn score_gradient_t_tied_scores_neutral() { + assert!((score_gradient_t(0.25, 0.25, 0.25) - 0.5).abs() < 1e-9); + } + + #[test] + fn rank_row_style_same_inputs_same_color() { let parent = ItemId::opaque("test-scope"); - let first_in_four = rank_row_style(&parent, 0, 4); - let last_in_four = rank_row_style(&parent, 3, 4); - let first_in_two = rank_row_style(&parent, 0, 2); - let last_in_two = rank_row_style(&parent, 1, 2); - assert_eq!(first_in_four, first_in_two); - assert_eq!(last_in_four, last_in_two); - assert_ne!(first_in_four, last_in_four); + assert_eq!( + rank_row_style(&parent, 0.33, 0.20, 0.60), + rank_row_style(&parent, 0.33, 0.20, 0.60), + ); } #[test]