Add tailed lower lambda (#2036).

changes/27.2.1.md

@@ -1,2 +1,3 @@
 * Refine shape of flat `5` (#2030).
 * Fix `ss02`, `ss04`, `ss06`, `ss13`, `ss17`'s application on `i` and `j` (#2033).
+* Add tailed lower lambda (#2036).

font-src/glyphs/letter/latin/lower-y.ptl

@@ -81,10 +81,13 @@ glyph-block Letter-Latin-Lower-Y : begin
 			set-base-anchor 'trailing' anchorX 0
 			OgonekTrY.set currentGlyph
 
+		define [px1HooktopAdj hooktop] : begin
+			return : px1 - [if hooktop ([StrokeWidthBlend (0.5 * TailX) (0.375 * TailX)] / (RightSB - SB)) 0]
+
 		define [yBaseKnots top bottom shrink hooktop] : begin
 			define {ds ds2} : CalcDS top bottom
 
-			define coJoinX : mix yrstrokel yrstroker px1
+			define coJoinX : mix yrstrokel yrstroker [px1HooktopAdj hooktop]
 			define coJoinY : mix (bottom + ds2) (top - ds) py1
 			define joinX : mix yrstrokel yrstroker (1 - px2)
 			define joinY : mix (bottom + ds2) (top - ds) (1 - py2)
@@ -92,7 +95,7 @@ glyph-block Letter-Latin-Lower-Y : begin
 
 
 			return : list
-				if (straightBar && (! hooktop))
+				if (straightBar && !hooktop)
 					then : list
 					else : list [flat coJoinX coJoinY]
 
@@ -141,7 +144,7 @@ glyph-block Letter-Latin-Lower-Y : begin
 		define [yJoinProportion hooktop x] : linreg
 			1 - px2
 			1 - py2
-			if (straightBar && !hooktop) 1 px1
+			if (straightBar && !hooktop) 1 [px1HooktopAdj hooktop]
 			if (straightBar && !hooktop) 1 py1
 			(x - yrstrokel) / (yrstroker - yrstrokel)
 
@@ -207,18 +210,20 @@ glyph-block Letter-Latin-Lower-Y : begin
 
 			include : yOgonekAttach top bottom yshrink true
 
+			local startX : [mix yrstrokel yrstroker px1] - HalfStroke + [StrokeWidthBlend 0.5 0.75] * TailX
+			local startY : top - Stroke - O
+
+			local [rightStroke shrink] : dispiro
+				straight.left.start startX startY [widths.rhs]
+				alsoThruThem {{[StrokeWidthBlend 0.58 0.65] 0.2} {[StrokeWidthBlend 0.78 0.85] 0.5}} important
+				yBaseKnots top bottom shrink true
+
 			include : intersection
+				rightStroke 1
 				SmallYStrokeSplitMask top bottom true 1
-				dispiro
-					widths.rhs
-					straight.left.start ([mix yrstrokel yrstroker px1] - HalfStroke + TailX) (XH - Stroke - O)
-					yBaseKnots top bottom 1 true
 
 			include : difference
-				dispiro
-					widths.rhs
-					straight.left.start ([mix yrstrokel yrstroker px1] - HalfStroke + TailX) (XH - Stroke - O)
-					yBaseKnots top bottom yshrink true
+				rightStroke yshrink
 				SmallYStrokeSplitMask top bottom true 1 1
 
 			include : difference
@@ -241,6 +246,14 @@ glyph-block Letter-Latin-Lower-Y : begin
 			include : Scale 1 (-1)
 			include : Translate 0 (+[mix bottom top 0.5])
 
+		export : define [SmallLambdaShapeFromHookTop top bottom] : union : glyph-proc
+			set currentGlyph.gizmo : Italify (-para.slopeAngle)
+			include : SmallYHookTopShape top bottom
+			set currentGlyph.gizmo : Italify (+para.slopeAngle)
+			include : Translate 0 (-[mix bottom top 0.5])
+			include : Scale 1 (-1)
+			include : Translate 0 (+[mix bottom top 0.5])
+
 	define NonCursiveConfig : SuffixCfg.weave
 		object # body
 			straight      true
@@ -266,12 +279,22 @@ glyph-block Letter-Latin-Lower-Y : begin
 			include : MarkSet.b
 			include : Shapes.SmallLambdaShape Ascender 0
 
+		create-glyph "grek/lambdaFHT.\(suffix)" : glyph-proc
+			include : MarkSet.b
+			include : Shapes.SmallLambdaShapeFromHookTop Ascender 0
+
 		create-glyph "lambdaSlash.\(suffix)" : glyph-proc
 			include : MarkSet.b
 			include : union
 				FlatSlashShape [mix SB RightSB 0.45] [mix 0 CAP 0.8] (OverlayStroke / 2)
 				Shapes.SmallLambdaShape Ascender 0
 
+		create-glyph "lambdaSlashFHT.\(suffix)" : glyph-proc
+			include : MarkSet.b
+			include : union
+				FlatSlashShape [mix SB RightSB 0.45] [mix 0 CAP 0.8] (OverlayStroke / 2)
+				Shapes.SmallLambdaShapeFromHookTop Ascender 0
+
 		create-glyph "yHookTop.\(suffix)" : glyph-proc
 			include : MarkSet.p
 			set-base-anchor 'strike' Middle (XH / 2)
@@ -283,6 +306,11 @@ glyph-block Letter-Latin-Lower-Y : begin
 			set-base-anchor 'strike' Middle (XH / 2 - Descender)
 			include : Shapes.SmallYShape CAP 0
 
+	alias 'grek/lambda.tailedTurnSerifless' null 'grek/lambdaFHT.straightTurnSerifless'
+	alias 'lambdaSlash.tailedTurnSerifless' null 'lambdaSlashFHT.straightTurnSerifless'
+	alias 'grek/lambda.curlyTailedTurnSerifless' null 'grek/lambdaFHT.curlyTurnSerifless'
+	alias 'lambdaSlash.curlyTailedTurnSerifless' null 'lambdaSlashFHT.curlyTurnSerifless'
+
 	define Cursive : namespace
 		export : define [Arc top bottom] : new-glyph : glyph-proc
 			include : nShoulder
@@ -350,7 +378,6 @@ glyph-block Letter-Latin-Lower-Y : begin
 			include : hookShape CAP 0
 			include : Cursive.Serifs CAP slabKind
 
-
 	select-variant 'y' 'y'
 	select-variant 'y/nonCursive' (shapeFrom -- 'y')
 	link-reduced-variant 'y/sansSerif' 'y' MathSansSerif

params/variants.toml

@@ -4619,6 +4619,16 @@ rank = 4
 description = "More curly Greek small Lambda (`λ`), like Iosevka 2.x, with a tail turns leftward"
 selector."grek/lambda" = "curlyTurnSerifless"
 
+[prime.lower-lambda.variants.tailed-turn]
+rank = 5
+description = "More curly Greek small Lambda (`λ`), with a tail turns leftward at top and a tail turns right at bottom-right"
+selector."grek/lambda" = "tailedTurnSerifless"
+
+[prime.lower-lambda.variants.curly-tailed-turn]
+rank = 6
+description = "More curly Greek small Lambda (`λ`), with a tail turns leftward at top, a tail turns right at bottom-right, and curly bottom-left leg"
+selector."grek/lambda" = "curlyTailedTurnSerifless"
+
 
 
 [prime.lower-mu]
@@ -7342,7 +7352,7 @@ long-s = "flat-hook-middle-serifed"
 eszet = "longs-s-lig-serifless"
 lower-eth = "straight-bar"
 lower-iota = "tailed"
-lower-lambda = "straight-turn"
+lower-lambda = "tailed-turn"
 lower-mu = "toothed-serifless"
 lower-pi = "tailless"
 lower-tau = "tailless"
@@ -7518,7 +7528,7 @@ long-s = "flat-hook-serifless"
 eszet = "longs-s-lig-serifless"
 lower-eth = "straight-bar"
 lower-iota = "tailed-serifed"
-lower-lambda = "straight-turn"
+lower-lambda = "tailed-turn"
 lower-tau = "tailed"
 cyrl-capital-zhe = "symmetric-touching"
 cyrl-zhe = "symmetric-touching"
@@ -7963,7 +7973,7 @@ capital-delta = "curly"
 lower-delta = "flat-top"
 lower-iota = "tailed-serifed"
 capital-lambda = "curly-serifless"
-lower-lambda = "curly-turn"
+lower-lambda = "curly-tailed-turn"
 lower-mu = "toothed-serifless"
 lower-tau = "tailed"
 lower-chi = "curly-serifless"