refactor: make _computeBestMoveShapes() public

lichess-org · Oct 22, 2024 · 762b743 · 762b743
1 parent f02368c
commit 762b743
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Showing 2 changed files with 73 additions and 70 deletions.
diff --git a/lib/src/model/common/eval.dart b/lib/src/model/common/eval.dart
@@ -1,8 +1,11 @@
 import 'dart:math' as math;
 
+import 'package:chessground/chessground.dart';
 import 'package:collection/collection.dart';
 import 'package:dartchess/dartchess.dart';
 import 'package:fast_immutable_collections/fast_immutable_collections.dart';
+import 'package:flutter/foundation.dart';
+import 'package:flutter/material.dart';
 import 'package:freezed_annotation/freezed_annotation.dart';
 import 'package:lichess_mobile/src/model/common/chess.dart';
 
@@ -158,6 +161,75 @@ class PvData with _$PvData {
 
 typedef MoveWithWinningChances = ({Move move, double winningChances});
 
+ISet<Shape> computeBestMoveShapes(
+  IList<MoveWithWinningChances> moves,
+  Side sideToMove,
+  PieceAssets pieceAssets,
+) {
+  // Scale down all moves with index > 0 based on how much worse their winning chances are compared to the best move
+  // (assume moves are ordered by their winning chances, so index==0 is the best move)
+  double scaleArrowAgainstBestMove(int index) {
+    const minScale = 0.15;
+    const maxScale = 1.0;
+    const winningDiffScaleFactor = 2.5;
+
+    final bestMove = moves[0];
+    final winningDiffComparedToBestMove =
+        bestMove.winningChances - moves[index].winningChances;
+    // Force minimum scale if the best move is significantly better than this move
+    if (winningDiffComparedToBestMove > 0.3) {
+      return minScale;
+    }
+    return clampDouble(
+      math.max(
+        minScale,
+        maxScale - winningDiffScaleFactor * winningDiffComparedToBestMove,
+      ),
+      0,
+      1,
+    );
+  }
+
+  return ISet(
+    moves.mapIndexed(
+      (i, m) {
+        final move = m.move;
+        // Same colors as in the Web UI with a slightly different opacity
+        // The best move has a different color than the other moves
+        final color = Color((i == 0) ? 0x66003088 : 0x664A4A4A);
+        switch (move) {
+          case NormalMove(from: _, to: _, promotion: final promRole):
+            return [
+              Arrow(
+                color: color,
+                orig: move.from,
+                dest: move.to,
+                scale: scaleArrowAgainstBestMove(i),
+              ),
+              if (promRole != null)
+                PieceShape(
+                  color: color,
+                  orig: move.to,
+                  pieceAssets: pieceAssets,
+                  piece: Piece(color: sideToMove, role: promRole),
+                ),
+            ];
+          case DropMove(role: final role, to: _):
+            return [
+              PieceShape(
+                color: color,
+                orig: move.to,
+                pieceAssets: pieceAssets,
+                opacity: 0.5,
+                piece: Piece(color: sideToMove, role: role),
+              ),
+            ];
+        }
+      },
+    ).expand((e) => e),
+  );
+}
+
 double cpToPawns(int cp) => cp / 100;
 
 int cpFromPawns(double pawns) => (pawns * 100).round();

diff --git a/lib/src/view/analysis/analysis_board.dart b/lib/src/view/analysis/analysis_board.dart
@@ -68,7 +68,7 @@ class AnalysisBoardState extends ConsumerState<AnalysisBoard> {
     final ISet<Shape> bestMoveShapes = showBestMoveArrow &&
             analysisState.isEngineAvailable &&
             bestMoves != null
-        ? _computeBestMoveShapes(
+        ? computeBestMoveShapes(
             bestMoves,
             currentNode.position.turn,
             boardPrefs.pieceSet.assets,
@@ -119,75 +119,6 @@ class AnalysisBoardState extends ConsumerState<AnalysisBoard> {
     );
   }
 
-  ISet<Shape> _computeBestMoveShapes(
-    IList<MoveWithWinningChances> moves,
-    Side sideToMove,
-    PieceAssets pieceAssets,
-  ) {
-    // Scale down all moves with index > 0 based on how much worse their winning chances are compared to the best move
-    // (assume moves are ordered by their winning chances, so index==0 is the best move)
-    double scaleArrowAgainstBestMove(int index) {
-      const minScale = 0.15;
-      const maxScale = 1.0;
-      const winningDiffScaleFactor = 2.5;
-
-      final bestMove = moves[0];
-      final winningDiffComparedToBestMove =
-          bestMove.winningChances - moves[index].winningChances;
-      // Force minimum scale if the best move is significantly better than this move
-      if (winningDiffComparedToBestMove > 0.3) {
-        return minScale;
-      }
-      return clampDouble(
-        math.max(
-          minScale,
-          maxScale - winningDiffScaleFactor * winningDiffComparedToBestMove,
-        ),
-        0,
-        1,
-      );
-    }
-
-    return ISet(
-      moves.mapIndexed(
-        (i, m) {
-          final move = m.move;
-          // Same colors as in the Web UI with a slightly different opacity
-          // The best move has a different color than the other moves
-          final color = Color((i == 0) ? 0x66003088 : 0x664A4A4A);
-          switch (move) {
-            case NormalMove(from: _, to: _, promotion: final promRole):
-              return [
-                Arrow(
-                  color: color,
-                  orig: move.from,
-                  dest: move.to,
-                  scale: scaleArrowAgainstBestMove(i),
-                ),
-                if (promRole != null)
-                  PieceShape(
-                    color: color,
-                    orig: move.to,
-                    pieceAssets: pieceAssets,
-                    piece: Piece(color: sideToMove, role: promRole),
-                  ),
-              ];
-            case DropMove(role: final role, to: _):
-              return [
-                PieceShape(
-                  color: color,
-                  orig: move.to,
-                  pieceAssets: pieceAssets,
-                  opacity: 0.5,
-                  piece: Piece(color: sideToMove, role: role),
-                ),
-              ];
-          }
-        },
-      ).expand((e) => e),
-    );
-  }
-
   void _onCompleteShape(Shape shape) {
     if (userShapes.any((element) => element == shape)) {
       setState(() {