Make swing after take look less weird.

www/js/animation.ts

@@ -238,7 +238,21 @@ export class TransitionAnimationSegment extends AnimationSegment {
   }
 
   override drawDebug(ctx: CanvasRenderingContext2D, progress: number) {
-    // TODO display transition somehow?
+    // TODO better way to display transition?
+    if (progress < this.startTransitionProgress) {
+      ctx.beginPath();
+      ctx.moveTo(this.startPosition.position.x, this.startPosition.position.y);
+      const transitionStart = this.actualAnimation.interpolateOffset(this.startTransitionProgress);
+      ctx.lineTo(transitionStart.x, transitionStart.y);
+      ctx.stroke();
+    } else if (progress > 1 - this.endTransitionProgress) {
+      ctx.beginPath();
+      const transitionEnd = this.actualAnimation.interpolateOffset(this.endTransitionProgress);
+      ctx.moveTo(transitionEnd.x, transitionEnd.y);
+      ctx.lineTo(this.endPosition.position.x, this.endPosition.position.y);
+      ctx.stroke();
+    }
+
     this.actualAnimation.drawDebug(ctx, progress);
   }
 }

www/js/interpreter.ts

@@ -594,7 +594,7 @@ function moveAsLowLevelMoves({ move, nextMove, startingPos, numProgessions }: {
       });
 
     case "swing":
-      return handlePairedMove(move.parameters.who, ({ id, startPos, around, withId }) => {
+      return handlePairedMove(move.parameters.who, ({ id, startPos, around, withId, withPos }) => {
         // TODO swing can start from non-circle positions.
         // TODO swing end is only in notes / looking at next move.
 
@@ -602,6 +602,7 @@ function moveAsLowLevelMoves({ move, nextMove, startingPos, numProgessions }: {
         // TODO more structured way to do this than enumerating next moves here?
         //      maybe instead of nextMove an optional endPosition for fixing up positions?
         //      ... but then every move would have to handle that...
+        const afterTake = startPos.longLines === LongLines.Near || withPos.longLines === LongLines.Near;
         const toShortLines = nextMove.move === "down the hall" || nextMove.move === "up the hall";
         const endFacingAcross = (around === CircleSide.Left || around === CircleSide.Right) && !toShortLines;
 
@@ -609,7 +610,10 @@ function moveAsLowLevelMoves({ move, nextMove, startingPos, numProgessions }: {
         const startPosition: SemanticPosition = {
           ...startPos,
           facing: around === CircleSide.Left || CircleSide.Right
-            ? (startWhich instanceof CirclePosition ? (startWhich.topBottomSide() === CircleSide.Bottom ? Facing.Up : Facing.Down)
+            ? (startWhich instanceof CirclePosition
+              ? afterTake
+                ? startPos.longLines === LongLines.Near ? startWhich.facingOut() : startWhich.facingAcross()
+                : (startWhich.topBottomSide() === CircleSide.Bottom ? Facing.Up : Facing.Down)
               : startWhich.facingSide())
             : (startWhich.isLeft() ? Facing.Right : Facing.Left),
         };
@@ -691,6 +695,7 @@ function moveAsLowLevelMoves({ move, nextMove, startingPos, numProgessions }: {
             around,
             endFacing: startWhich.leftRightSide() === CircleSide.Left ? Facing.Right : Facing.Left,
             swingRole,
+            afterTake,
           },
         };
 
@@ -766,8 +771,9 @@ function moveAsLowLevelMoves({ move, nextMove, startingPos, numProgessions }: {
 
       return handleCirclePairedMove(move.parameters.who, ({ startPos }) => {
         const handTo = startPos.which.isOnLeftLookingAcross() ? HandTo.DancerRight : HandTo.DancerLeft;
-        const startingPos = {
+        const startingPos: SemanticPosition = {
           ...startPos,
+          facing: startPos.which.facingAcross(),
           dancerDistance: DancerDistance.Compact,
           hands: new Map<Hand, HandConnection>([
             [Hand.Left, { hand: Hand.Left, to: handTo }],
@@ -874,35 +880,52 @@ function moveAsLowLevelMoves({ move, nextMove, startingPos, numProgessions }: {
           endPosition = withPos;
         } else if (intoWave) {
           if (startPos.kind === PositionKind.ShortLines) {
-            // Fix startPos if necessary. Needed because pass through always swaps but sometimes shouldn't.
-            if ((around === CircleSide.Left || around === CircleSide.Right) &&
-              (startPos.facing === Facing.Up || startPos.facing === Facing.Down) &&
-              ((byHandOrShoulder === Hand.Right)
-                !== (startPos.facing === Facing.Up)
-                !== (startPos.which === ShortLinesPosition.FarLeft || startPos.which === ShortLinesPosition.MiddleRight))) {
-              startingPos = {
-                ...startPos,
-                which: startPos.which.swapOnSide()
-              };
-            }
+            if (around === CircleSide.Left || around === CircleSide.Right) {
+              // Fix startPos if necessary. Needed because pass through always swaps but sometimes shouldn't.
+              if ((startPos.facing === Facing.Up || startPos.facing === Facing.Down) &&
+                ((byHandOrShoulder === Hand.Right)
+                  !== (startPos.facing === Facing.Up)
+                  !== (startPos.which === ShortLinesPosition.FarLeft || startPos.which === ShortLinesPosition.MiddleRight))) {
+                startingPos = {
+                  ...startPos,
+                  which: startPos.which.swapOnSide()
+                };
+              }
 
-            const endWhich = CirclePosition.fromSides(startingPos.which.leftRightSide(),
-              (startingPos.which === ShortLinesPosition.FarLeft || startingPos.which === ShortLinesPosition.MiddleRight)
-                !== (byHandOrShoulder === Hand.Right)
-                !== (intoWavePositions === 1)
-                ? CircleSide.Top
-                : CircleSide.Bottom);
-            endPosition = {
-              kind: PositionKind.Circle,
-              which: endWhich,
-              facing: (startingPos.facing === Facing.Up) === (intoWavePositions === 1)
-                ? endWhich.facingAcross()
-                : endWhich.facingOut(),
-              setOffset: startingPos.setOffset,
-              lineOffset: startingPos.lineOffset,
+              const endWhich = CirclePosition.fromSides(startingPos.which.leftRightSide(),
+                (startingPos.which === ShortLinesPosition.FarLeft || startingPos.which === ShortLinesPosition.MiddleRight)
+                  !== (byHandOrShoulder === Hand.Right)
+                  !== (intoWavePositions === 1)
+                  ? CircleSide.Top
+                  : CircleSide.Bottom);
+              endPosition = {
+                kind: PositionKind.Circle,
+                which: endWhich,
+                facing: (startingPos.facing === Facing.Up) === (intoWavePositions === 1)
+                  ? endWhich.facingAcross()
+                  : endWhich.facingOut(),
+                setOffset: startingPos.setOffset,
+                lineOffset: startingPos.lineOffset,
+              }
+            } else {
+              throw new Error("Allemande from short lines to line line in middle unsupported.");
             }
           } else {
-            throw new Error("Allemande from circle to short lines is unsupported.");
+            if (around === "Center") {
+              const startCenter = startPos.longLines === LongLines.Center;
+              const endWhich = startPos.which.circleRight(intoWavePositions);
+              endPosition = {
+                kind: PositionKind.Circle,
+                which: endWhich,
+                facing: startPos.which.facingOut(),
+                longLines: startCenter ? undefined : LongLines.Center,
+                setOffset: startPos.setOffset,
+                lineOffset: startPos.lineOffset,
+              }
+
+            } else {
+              throw new Error("Allemande from circle to short lines is unsupported.");
+            }
           }
         }
 
@@ -1446,7 +1469,7 @@ function moveAsLowLevelMoves({ move, nextMove, startingPos, numProgessions }: {
             {
               beats: backwardBeats,
               endPosition: startPosition,
-              movementPattern: { kind: SemanticAnimationKind.Linear },
+              movementPattern: { kind: SemanticAnimationKind.Linear, minRotation: 0 },
             },
           ], startPosition);
         } else {

www/js/interpreterCommon.ts

@@ -345,6 +345,9 @@ export enum LongLines {
 
   // Only a little offset (has walked almost all the way from the other side after a give and take).
   Near = "Near",
+
+  // Actually in center. May be slightly offset for wavy lines.
+  Center = "Center",
 }
 export type SemanticPosition = {
   kind: PositionKind.Circle,

www/js/lowLevelMove.ts

@@ -88,6 +88,9 @@ export type SemanticAnimation = {
 
   // Swings are asymmetric. This is usually but not always the dancer's role.
   swingRole: common.DanceRole,
+
+  // After a take need to fixup the position.
+  afterTake: boolean,
 } | {
   kind: SemanticAnimationKind.TwirlSwap,
 
@@ -270,6 +273,8 @@ function SemanticToSetPosition(semantic: SemanticPosition): DancerSetPosition {
           throw "Invalid circle position: " + semantic.which;
       }
       switch(semantic.longLines) {
+        case LongLines.Center:
+          position.x *= 0.1;
         case LongLines.Forward:
           position.x *= 0.3;
         case LongLines.Near:
@@ -585,6 +590,7 @@ function animateLowLevelMoveWithoutSlide(move: LowLevelMove): animation.Animatio
               ])
             }),
             flags: {
+              rotation: true,
               hands: true,
               handsDuring: circleHands,
             },
@@ -669,15 +675,26 @@ function animateLowLevelMoveWithoutSlide(move: LowLevelMove): animation.Animatio
 
         const baseSwingStart = {
           ...move.startPosition,
-          dancerDistance,
+          dancerDistance: move.movementPattern.afterTake ? undefined : dancerDistance,
           balance: undefined,
           longLines: undefined,
         }
-        const swingStart = SemanticToSetPosition(move.startPosition.longLines === LongLines.Near ? {
+        const swingStartUnadjusted = SemanticToSetPosition(move.startPosition.longLines === LongLines.Near ? {
           ...baseSwingStart,
           kind: PositionKind.Circle,
           which: move.startPosition.which.swapUpAndDown(),
         } : baseSwingStart);
+        const swingStart = move.movementPattern.afterTake
+          ? {
+            ...swingStartUnadjusted, position: {
+              x: swingStartUnadjusted.position.x
+                + ((move.startPosition.longLines === LongLines.Near) === (move.startPosition.which.isLeft())
+                  ? +0.5
+                  : -0.5),
+              y: rotateSwingCenter.y,
+            }
+          }
+          : swingStartUnadjusted;
         const beforeUnfold = SemanticToSetPosition({
           ...move.endPosition,
           dancerDistance,
@@ -696,15 +713,16 @@ function animateLowLevelMoveWithoutSlide(move: LowLevelMove): animation.Animatio
         const turns = Math.ceil(Math.abs(move.movementPattern.minAmount / 360));
         const swingMinRotation = (minTurns - turns) * (move.movementPattern.minAmount < 0 ? -360 : 360) + move.movementPattern.minAmount;
 
-        return [
-          new animation.TransitionAnimationSegment({
+        const slideAmount = move.movementPattern.afterTake ? { x: 0, y: rotateSwingCenter.y - startSetPosition.position.y  } : undefined;
+
+        const swingAnimation = new animation.TransitionAnimationSegment({
             actualAnimation: new animation.RotationAnimationSegment({
               beats: swingBeats,
-              startPosition: swingStart,
-              endPosition: beforeUnfold,
+              startPosition: slideAmount ? { ...swingStart, position: OffsetPlus(swingStart.position, OffsetTimes(slideAmount, -1)) } : swingStart,
+              endPosition: slideAmount ? { ...beforeUnfold, position: OffsetPlus(beforeUnfold.position, OffsetTimes(slideAmount, -1)) } : beforeUnfold,
               rotation: swingMinRotation,
               around: {
-                center: rotateSwingCenter,
+                center: slideAmount ? OffsetPlus(rotateSwingCenter, OffsetTimes(slideAmount, -1)) : rotateSwingCenter,
                 width: 1,
                 height: 1,
               },
@@ -722,7 +740,14 @@ function animateLowLevelMoveWithoutSlide(move: LowLevelMove): animation.Animatio
             },
             startTransitionBeats: 1,
             endTransitionBeats: 0,
-          }),
+          });
+
+        return [
+          slideAmount ? new animation.SlideAnimationSegment(
+            swingAnimation.beats,
+            [swingAnimation],
+            slideAmount,
+          ) : swingAnimation,
           new animation.LinearAnimationSegment({
             beats: 1,
             startPosition: beforeUnfold,