Fix #828: Offset Path's Joins and Zig Zag's Points are dropdowns

The effect versions of Offset Path, Zig Zag and Roughen showed Joins and
Points as free text fields. They now pick Miter, Round or Bevel and
Smooth or Corner, as Object > Path > Offset Path does. A size's
Relative / Absolute (Roughen, Zig Zag, Tweak) is a pair of radio
buttons, and the effect dialogs' other on/off options are checkboxes
that show when they are off too (they were invisible unchecked).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

crates/ui-egui/src/dialogs/effect.rs

@@ -158,6 +158,8 @@ fn choices(effect: &str, key: &str) -> Option<form::Choices> {
         ("blur.radial", "method") => Some(&[("Spin", "spin"), ("Zoom", "zoom")]),
         ("blur.radial", "quality") => Some(&[("Draft", "draft"), ("Good", "good"), ("Best", "best")]),
         ("blur.smart", "quality") => Some(&[("Low", "low"), ("Medium", "medium"), ("High", "high")]),
+        ("path.offsetPath", "joins") => Some(&[("Miter", "miter"), ("Round", "round"), ("Bevel", "bevel")]),
+        ("distort.roughen" | "distort.zigZag", "points") => Some(&[("Smooth", "smooth"), ("Corner", "corner")]),
         _ => None,
     }
 }
@@ -371,3 +373,19 @@ fn confirm(app: &mut VectorcraftApp, d: &Dialog) -> Result<Value, String> {
     app.ui.dialog = None;
     r
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn fields_that_pick_a_value_are_dropdowns_of_its_values() {
+        // The values come from the effect's parameter documentation (`joins: "miter"|"round"|…`).
+        for (effect, key) in [("path.offsetPath", "joins"), ("distort.zigZag", "points"), ("distort.roughen", "points")] {
+            let doc = vectorcraft_effects::effect_info(effect).unwrap().params;
+            let listed = doc.split(&format!("{key}: ")).nth(1).unwrap().split([',', '}', ' ']).next().unwrap().to_string();
+            let values: Vec<String> = choices(effect, key).unwrap().iter().map(|(_, v)| format!("\"{v}\"")).collect();
+            assert_eq!(values.join("|"), listed, "{effect} {key}");
+        }
+    }
+}

crates/ui-egui/src/dialogs/form.rs

@@ -215,7 +215,9 @@ pub(super) fn param_fields(
             d.fields.iter().filter(|(k, _)| !k.starts_with("__") && k.as_str() != "preview").map(|(k, v)| (k.clone(), v.clone())).collect();
         keys.sort_by_key(|(k, _)| rank(k));
         for (k, v) in keys {
-            ui.label(egui::RichText::new(humanized(&k)).color(t.text));
+            // A size's Relative / Absolute pair (Roughen, Zig Zag, Tweak) is its own label.
+            let relative = k == "relative" && v.is_boolean();
+            ui.label(egui::RichText::new(if relative { String::new() } else { humanized(&k) }).color(t.text));
             if let Some(cur) = crate::widgets::blend_param(&k, &v) {
                 if let Some(m) = crate::widgets::blend_param_dropdown(ui, ("fx-blend", &k), cur) {
                     d.fields.insert(k, m);
@@ -247,9 +249,19 @@ pub(super) fn param_fields(
                         changed = true;
                     }
                 }
-                Value::Bool(mut b) => {
-                    if ui.checkbox(&mut b, "").changed() {
-                        d.fields.insert(k, json!(b));
+                Value::Bool(b) if relative => {
+                    ui.horizontal(|ui| {
+                        for (label, on) in [(tl!("Relative"), true), (tl!("Absolute"), false)] {
+                            if crate::widgets::radio(ui, label, b == on, true) && b != on {
+                                d.fields.insert(k.clone(), json!(on));
+                                changed = true;
+                            }
+                        }
+                    });
+                }
+                Value::Bool(b) => {
+                    if crate::widgets::check(ui, "", b, true) {
+                        d.fields.insert(k, json!(!b));
                         changed = true;
                     }
                 }

crates/ui-egui/src/i18n/es.tsv

@@ -2564,6 +2564,9 @@
 	Smart Guides (⌘U)	Guías inteligentes (⌘U)
 	Smart Punctuation…	Puntuación inteligente…
 	Smooth	Suavizar
+	Corner	Vértice
+	Relative	Relativo
+	Absolute	Absoluto
 	Smooth Color	Color suavizado
 	Smooth Tool	Herramienta Suavizar
 	Snap Curves To Lines	Ajustar curvas a líneas

crates/ui-egui/src/i18n/fr.tsv

@@ -2561,6 +2561,9 @@
 	Smart Guides (⌘U)	Repères commandés (⌘U)
 	Smart Punctuation…	Ponctuation typographique…
 	Smooth	Lisser
+	Corner	Angle
+	Relative	Relatif
+	Absolute	Absolu
 	Smooth Color	Couleur lissée
 	Smooth Tool	Outil Arrondi
 	Snap Curves To Lines	Aimanter les courbes aux lignes

crates/ui-egui/src/i18n/it.tsv

@@ -2564,6 +2564,9 @@
 	Smart Guides (⌘U)	Guide sensibili (⌘U)
 	Smart Punctuation…	Punteggiatura intelligente…
 	Smooth	Smussa
+	Corner	Angolo
+	Relative	Relativo
+	Absolute	Assoluto
 	Smooth Color	Colore graduale
 	Smooth Tool	Strumento Smussa
 	Snap Curves To Lines	Aggancia curve a linee

crates/ui-egui/src/i18n/ja.tsv

@@ -2379,6 +2379,9 @@
 	Smart Guides (View → Smart Guides)	スマートガイド (表示 → スマートガイド)
 	Smart Guides (⌘U)	スマートガイド (⌘U)
 	Smooth	スムーズ
+	Corner	コーナー
+	Relative	相対
+	Absolute	絶対
 	Smooth Tool	スムーズツール
 	Snap Curves To Lines	曲線を直線にスナップ
 	View:	表示:

crates/ui-egui/src/i18n/ru.tsv

@@ -2560,6 +2560,9 @@
 	Smart Guides (⌘U)	Умные направляющие (⌘U)
 	Smart Punctuation…	Умная пунктуация…
 	Smooth	Сгладить
+	Corner	Угол
+	Relative	Относительно
+	Absolute	Абсолютно
 	Smooth Color	Сглаженный цвет
 	Smooth Tool	Инструмент «Сглаживание»
 	Snap Curves To Lines	Привязывать кривые к линиям

crates/ui-egui/src/i18n/uk.tsv

@@ -2556,6 +2556,9 @@
 	Smart Guides (⌘U)	Розумні напрямні (⌘U)
 	Smart Punctuation…	Розумна пунктуація…
 	Smooth	Згладити
+	Corner	Кут
+	Relative	Відносно
+	Absolute	Абсолютно
 	Smooth Color	Згладжений колір
 	Smooth Tool	Інструмент «Згладжування»
 	Snap Curves To Lines	Прив’язувати криві до ліній

crates/ui-egui/src/i18n/zh-hans.tsv

@@ -2481,6 +2481,9 @@
 	Smart Guides (⌘U)	智能参考线 (⌘U)
 	Smart Punctuation…	智能标点…
 	Smooth	平滑
+	Corner	尖角
+	Relative	相对
+	Absolute	绝对
 	Smooth Color	平滑颜色
 	Smooth Tool	平滑工具
 	Snap Curves To Lines	将曲线对齐到直线

crates/ui-egui/src/i18n/zh-hant.tsv

@@ -2567,6 +2567,9 @@
 	Smart Guides (⌘U)	智慧型參考線 (⌘U)
 	Smart Punctuation…	智慧型標點…
 	Smooth	平滑
+	Corner	角點
+	Relative	相對
+	Absolute	絕對
 	Smooth Color	平滑顏色
 	Smooth Tool	平滑工具
 	Snap Curves To Lines	將曲線靠齊線條