Implement sweep selection of promotion piece

[xboard.git] / backend.c

diff --git a/backend.c b/backend.c
index ea0d977..e40b1ce 100644 (file)
--- a/backend.c
+++ b/backend.c
@@ -268,6 +268,7 @@ extern int chatCount;
 int chattingPartner;
 char marker[BOARD_RANKS][BOARD_FILES]; /* [HGM] marks for target squares */
 ChessSquare pieceSweep = EmptySquare;
+ChessSquare promoSweep = EmptySquare;
 
 /* States for ics_getting_history */
 #define H_FALSE 0
@@ -4813,6 +4814,44 @@ ProcessICSInitScript(f)
 
 
 void
+Sweep(int step)
+{
+    ChessSquare piece = boards[currentMove][toY][toX];
+    ChessSquare king = WhiteKing, pawn = WhitePawn, last = promoSweep;
+    if(gameInfo.variant == VariantKnightmate) king = WhiteUnicorn;
+    if(gameInfo.variant == VariantSuicide || gameInfo.variant == VariantGiveaway) king = EmptySquare;
+    if(promoSweep >= BlackPawn) king = WHITE_TO_BLACK king, pawn = WHITE_TO_BLACK pawn;
+    if(gameInfo.variant == VariantSpartan && pawn == BlackPawn) pawn = BlackLance, king = EmptySquare;
+    if(gameInfo.variant == VariantShogi) pawn = EmptySquare;
+    do {
+       promoSweep += step;
+       if(promoSweep == EmptySquare) promoSweep = BlackPawn; // wrap
+       else if((int)promoSweep == -1) promoSweep = WhiteKing;
+       else if(promoSweep == BlackPawn && step > 0) promoSweep = WhitePawn;
+       else if(promoSweep == WhiteKing && step < 0) promoSweep = BlackKing;
+       if(!step) step = 1;
+    } while(promoSweep == king || promoSweep == pawn || PieceToChar(promoSweep) == '.'
+               || gameInfo.variant == VariantShogi && promoSweep != PROMOTED last && last != PROMOTED promoSweep && last != promoSweep);
+    boards[currentMove][toY][toX] = promoSweep;
+    DrawPosition(FALSE, boards[currentMove]);
+    boards[currentMove][toY][toX] = piece;
+}
+
+static int lastX, lastY;
+
+void PromoScroll(int x, int y)
+{
+  int step = 0;
+  if(abs(x - lastX) < 7 && abs(y - lastY) < 7) return;
+  if( y > lastY + 2 ) step = -1; else if(y < lastY - 2) step = 1;
+  if(!step) return;
+  lastX = x; lastY = y;
+
+  if(promoSweep == EmptySquare) return;
+  Sweep(step);
+}
+
+void
 NextPiece(int step)
 {
     ChessSquare piece = boards[currentMove][toY][toX];
@@ -5033,8 +5072,6 @@ fprintf(debugFP,"parsePV: %d %c%c%c%c yy='%s'\nPV = '%s'\n", valid, fromX+AAA, f
   DrawPosition(TRUE, boards[currentMove]);
 }
 
-static int lastX, lastY;
-
 Boolean
 LoadMultiPV(int x, int y, char *buf, int index, int *start, int *end)
 {
@@ -5752,6 +5789,10 @@ HasPromotionChoice(int fromX, int fromY, int toX, int toY, char *promoChoice)
     // give caller the default choice even if we will not make it
     if(gameInfo.variant == VariantSuicide || gameInfo.variant == VariantGiveaway)
         *promoChoice = PieceToChar(BlackKing); // in Suicide Q is the last thing we want
+    else if(gameInfo.variant == VariantSpartan)
+        *promoChoice = ToLower(PieceToChar(toY ? WhiteQueen : BlackAngel));
+    else if(gameInfo.variant == VariantShogi)
+        *promoChoice = '+';
     else *promoChoice = PieceToChar(BlackQueen);
     if(autoQueen) return FALSE; // predetermined
 
@@ -6387,6 +6428,18 @@ void LeftClick(ClickType clickType, int xPix, int yPix)
        x = BOARD_WIDTH - 1 - x;
     }
 
+    if(promoSweep != EmptySquare) {
+       char promoChar = ToLower(PieceToChar(promoSweep));
+       if(gameInfo.variant == VariantShogi) promoChar = promoSweep == boards[currentMove][fromY][fromX] ? '=' : '+';
+       saveAnimate = appData.animate; appData.animate = FALSE;
+       UserMoveEvent(fromX, fromY, toX, toY, promoChar);
+       appData.animate = saveAnimate;
+       promoSweep = EmptySquare;
+       DrawPosition(FALSE, boards[currentMove]);
+       fromX = fromY = -1;
+       return;
+    }
+
     if(promotionChoice) { // we are waiting for a click to indicate promotion piece
        if(clickType == Release) return; // ignore upclick of click-click destination
        promotionChoice = FALSE; // only one chance: if click not OK it is interpreted as cancel
@@ -6582,7 +6635,13 @@ void LeftClick(ClickType clickType, int xPix, int yPix)
            DisplayMessage("Click in holdings to choose piece", "");
            return;
        }
-       PromotionPopUp();
+       if(appData.sweepSelect && clickType == Press) {
+            lastX = xPix; lastY = yPix;
+            ChessSquare piece = boards[currentMove][fromY][fromX];
+            promoSweep = CharToPiece((piece >= BlackPawn ? ToLower : ToUpper)(promoChoice));
+            if(promoChoice == '+') promoSweep = PROMOTED piece;
+            Sweep(0);
+       } else PromotionPopUp();
     } else {
        int oldMove = currentMove;
        UserMoveEvent(fromX, fromY, toX, toY, promoChoice);