fix(bella,docs): Add front waist dart curve option and allow longer w…

…aist dart
freesewing · Sep 20, 2024 · 4f712b5 · 4f712b5
1 parent 6478df0
commit 4f712b5
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Showing 3 changed files with 25 additions and 1 deletion.
diff --git a/designs/bella/src/back.mjs b/designs/bella/src/back.mjs
@@ -33,7 +33,8 @@ export const back = {
     backDartHeight: { pct: 46, min: 38, max: 54, menu: 'darts' },
     bustDartCurve: { pct: 100, min: 0, max: 100, menu: 'darts' },
     bustDartLength: { pct: 90, min: 75, max: 100, menu: 'darts' },
-    waistDartLength: { pct: 90, min: 75, max: 95, menu: 'darts' },
+    waistDartCurve: { pct: 100, min: -100, max: 100, menu: 'darts' },
+    waistDartLength: { pct: 90, min: 75, max: 100, menu: 'darts' },
     // Armhole
     armholeDepth: { pct: 44, min: 38, max: 46, menu: 'armhole' },
     backArmholeCurvature: { pct: 63, min: 50, max: 85, menu: 'armhole' },

diff --git a/designs/bella/src/front-side-dart.mjs b/designs/bella/src/front-side-dart.mjs
@@ -167,6 +167,19 @@ export const frontSideDart = {
       90,
       points.waistDartHem.dist(points.bust) / 2
     )
+    // Apply option-controlled curvature to waist dart
+    points.waistDartLeftMid = new Path()
+      .move(points.bust)
+      .line(points.waistDartLeft)
+      .shiftFractionAlong(0.5)
+    points.waistDartRightMid = new Path()
+      .move(points.bust)
+      .line(points.waistDartRight)
+      .shiftFractionAlong(0.5)
+    const waistDartCpWidth =
+      points.waistDartLeftMid.dist(points.waistDartLeftCp) * options.waistDartCurve
+    points.waistDartLeftCp.x = points.waistDartLeftMid.x - waistDartCpWidth
+    points.waistDartRightCp.x = points.waistDartRightMid.x + waistDartCpWidth
 
     paths.seam = new Path()
       .move(points.cfHem)

diff --git a/markdown/org/docs/designs/bella/options/waistdartcurve/en.md b/markdown/org/docs/designs/bella/options/waistdartcurve/en.md
@@ -0,0 +1,10 @@
+---
+title: "Waist dart curve"
+---
+
+***
+
+<!-- ![The effect of the bust dart curve option on the pattern](sample.png) -->
+
+The **waist dart curve** option controls the curvature of the waist dart.
+From slightly concave, to straight, to slightly convex.