2 * board.c -- platform-independent drawing code for XBoard
4 * Copyright 1991 by Digital Equipment Corporation, Maynard,
7 * Enhancements Copyright 1992-2001, 2002, 2003, 2004, 2005, 2006,
8 * 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016 Free
9 * Software Foundation, Inc.
11 * The following terms apply to Digital Equipment Corporation's copyright
13 * ------------------------------------------------------------------------
16 * Permission to use, copy, modify, and distribute this software and its
17 * documentation for any purpose and without fee is hereby granted,
18 * provided that the above copyright notice appear in all copies and that
19 * both that copyright notice and this permission notice appear in
20 * supporting documentation, and that the name of Digital not be
21 * used in advertising or publicity pertaining to distribution of the
22 * software without specific, written prior permission.
24 * DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
25 * ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
26 * DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
27 * ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
28 * WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
29 * ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
31 * ------------------------------------------------------------------------
33 * The following terms apply to the enhanced version of XBoard
34 * distributed by the Free Software Foundation:
35 * ------------------------------------------------------------------------
37 * GNU XBoard is free software: you can redistribute it and/or modify
38 * it under the terms of the GNU General Public License as published by
39 * the Free Software Foundation, either version 3 of the License, or (at
40 * your option) any later version.
42 * GNU XBoard is distributed in the hope that it will be useful, but
43 * WITHOUT ANY WARRANTY; without even the implied warranty of
44 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
45 * General Public License for more details.
47 * You should have received a copy of the GNU General Public License
48 * along with this program. If not, see http://www.gnu.org/licenses/. *
50 *------------------------------------------------------------------------
51 ** See the file ChangeLog for a revision history. */
61 #include <sys/types.h>
69 #else /* not STDC_HEADERS */
70 extern char *getenv();
73 # else /* not HAVE_STRING_H */
75 # endif /* not HAVE_STRING_H */
76 #endif /* not STDC_HEADERS */
78 #if TIME_WITH_SYS_TIME
79 # include <sys/time.h>
83 # include <sys/time.h>
94 # include <sys/wait.h>
110 #define usleep(t) _sleep2(((t)+500)/1000)
114 int squareSize, lineGap;
116 int damage[2][BOARD_RANKS][BOARD_FILES];
118 /* There can be two pieces being animated at once: a player
119 can begin dragging a piece before the remote opponent has moved. */
121 AnimState anims[NrOfAnims];
123 static void DrawSquare P((int row, int column, ChessSquare piece, int do_flash));
124 static Boolean IsDrawArrowEnabled P((void));
125 static void DrawArrowHighlight P((int fromX, int fromY, int toX,int toY));
126 static void ArrowDamage P((int s_col, int s_row, int d_col, int d_row));
129 drawHighlight (int file, int rank, int type)
133 if (lineGap == 0) return;
136 x = lineGap/2 + ((BOARD_WIDTH-1)-file) *
137 (squareSize + lineGap);
138 y = lineGap/2 + rank * (squareSize + lineGap);
140 x = lineGap/2 + file * (squareSize + lineGap);
141 y = lineGap/2 + ((BOARD_HEIGHT-1)-rank) *
142 (squareSize + lineGap);
145 DrawBorder(x,y, type, lineGap & 1); // pass whether lineGap is odd
148 int hi1X = -1, hi1Y = -1, hi2X = -1, hi2Y = -1;
149 int pm1X = -1, pm1Y = -1, pm2X = -1, pm2Y = -1;
152 SetHighlights (int fromX, int fromY, int toX, int toY)
154 int arrow = hi2X >= 0 && hi1Y >= 0 && IsDrawArrowEnabled();
156 if (hi1X != fromX || hi1Y != fromY) {
157 if (hi1X >= 0 && hi1Y >= 0) {
158 drawHighlight(hi1X, hi1Y, 0);
160 } // [HGM] first erase both, then draw new!
162 if (hi2X != toX || hi2Y != toY) {
163 if (hi2X >= 0 && hi2Y >= 0) {
164 drawHighlight(hi2X, hi2Y, 0);
168 if(arrow) // there currently is an arrow displayed
169 ArrowDamage(hi1X, hi1Y, hi2X, hi2Y); // mark which squares it damaged
171 if (hi1X != fromX || hi1Y != fromY) {
172 if (fromX >= 0 && fromY >= 0) {
173 drawHighlight(fromX, fromY, 1);
176 if (hi2X != toX || hi2Y != toY) {
177 if (toX >= 0 && toY >= 0) {
178 drawHighlight(toX, toY, 1);
187 if(arrow || toX >= 0 && fromY >= 0 && IsDrawArrowEnabled())
188 DrawPosition(FALSE, NULL); // repair any arrow damage, or draw a new one
194 SetHighlights(-1, -1, -1, -1);
199 SetPremoveHighlights (int fromX, int fromY, int toX, int toY)
201 if (pm1X != fromX || pm1Y != fromY) {
202 if (pm1X >= 0 && pm1Y >= 0) {
203 drawHighlight(pm1X, pm1Y, 0);
205 if (fromX >= 0 && fromY >= 0) {
206 drawHighlight(fromX, fromY, 2);
209 if (pm2X != toX || pm2Y != toY) {
210 if (pm2X >= 0 && pm2Y >= 0) {
211 drawHighlight(pm2X, pm2Y, 0);
213 if (toX >= 0 && toY >= 0) {
214 drawHighlight(toX, toY, 2);
224 ClearPremoveHighlights ()
226 SetPremoveHighlights(-1, -1, -1, -1);
230 * If the user selects on a border boundary, return -1; if off the board,
231 * return -2. Otherwise map the event coordinate to the square.
234 EventToSquare (int x, int limit)
241 if ((x % (squareSize + lineGap)) >= squareSize)
243 x /= (squareSize + lineGap);
249 /* [HR] determine square color depending on chess variant. */
251 SquareColor (int row, int column)
255 if (gameInfo.variant == VariantXiangqi) {
256 if (column >= 3 && column <= 5 && row >= 0 && row <= 2) {
258 } else if (column >= 3 && column <= 5 && row >= 7 && row <= 9) {
260 } else if (row <= 4) {
266 square_color = ((column + row) % 2) == 1;
269 /* [hgm] holdings: next line makes all holdings squares light */
270 if(column < BOARD_LEFT || column >= BOARD_RGHT) square_color = 1;
272 if ( // [HGM] holdings: blank out area between board and holdings
273 column == BOARD_LEFT-1
274 || column == BOARD_RGHT
275 || (column == BOARD_LEFT-2 && row < BOARD_HEIGHT-gameInfo.holdingsSize)
276 || (column == BOARD_RGHT+1 && row >= gameInfo.holdingsSize) )
277 square_color = 2; // black
282 /* Convert board position to corner of screen rect and color */
285 ScreenSquare (int column, int row, Pnt *pt, int *color)
288 pt->x = lineGap + ((BOARD_WIDTH-1)-column) * (squareSize + lineGap);
289 pt->y = lineGap + row * (squareSize + lineGap);
291 pt->x = lineGap + column * (squareSize + lineGap);
292 pt->y = lineGap + ((BOARD_HEIGHT-1)-row) * (squareSize + lineGap);
294 *color = SquareColor(row, column);
297 /* Convert window coords to square */
300 BoardSquare (int x, int y, int *column, int *row)
302 *column = EventToSquare(x, BOARD_WIDTH);
303 if (flipView && *column >= 0)
304 *column = BOARD_WIDTH - 1 - *column;
305 *row = EventToSquare(y, BOARD_HEIGHT);
306 if (!flipView && *row >= 0)
307 *row = BOARD_HEIGHT - 1 - *row;
310 /* Generate a series of frame coords from start->mid->finish.
311 The movement rate doubles until the half way point is
312 reached, then halves back down to the final destination,
313 which gives a nice slow in/out effect. The algorithmn
314 may seem to generate too many intermediates for short
315 moves, but remember that the purpose is to attract the
316 viewers attention to the piece about to be moved and
317 then to where it ends up. Too few frames would be less
321 Tween (Pnt *start, Pnt *mid, Pnt *finish, int factor, Pnt frames[], int *nFrames)
323 int fraction, n, count;
327 /* Slow in, stepping 1/16th, then 1/8th, ... */
329 for (n = 0; n < factor; n++)
331 for (n = 0; n < factor; n++) {
332 frames[count].x = start->x + (mid->x - start->x) / fraction;
333 frames[count].y = start->y + (mid->y - start->y) / fraction;
335 fraction = fraction / 2;
339 frames[count] = *mid;
342 /* Slow out, stepping 1/2, then 1/4, ... */
344 for (n = 0; n < factor; n++) {
345 frames[count].x = finish->x - (finish->x - mid->x) / fraction;
346 frames[count].y = finish->y - (finish->y - mid->y) / fraction;
348 fraction = fraction * 2;
353 /**** Animation code by Hugh Fisher, DCS, ANU.
355 Known problem: if a window overlapping the board is
356 moved away while a piece is being animated underneath,
357 the newly exposed area won't be updated properly.
358 I can live with this.
360 Known problem: if you look carefully at the animation
361 of pieces in mono mode, they are being drawn as solid
362 shapes without interior detail while moving. Fixing
363 this would be a major complication for minimal return.
368 #undef Max /* just in case */
370 #define Max(a, b) ((a) > (b) ? (a) : (b))
371 #define Min(a, b) ((a) < (b) ? (a) : (b))
374 short int x, y, width, height;
384 SetRect (MyRectangle *rect, int x, int y, int width, int height)
389 rect->height = height;
392 /* Test if two frames overlap. If they do, return
393 intersection rect within old and location of
394 that rect within new. */
397 Intersect ( Pnt *old, Pnt *new, int size, MyRectangle *area, Pnt *pt)
399 if (old->x > new->x + size || new->x > old->x + size ||
400 old->y > new->y + size || new->y > old->y + size) {
403 SetRect(area, Max(new->x - old->x, 0), Max(new->y - old->y, 0),
404 size - abs(old->x - new->x), size - abs(old->y - new->y));
405 pt->x = Max(old->x - new->x, 0);
406 pt->y = Max(old->y - new->y, 0);
411 /* For two overlapping frames, return the rect(s)
412 in the old that do not intersect with the new. */
415 CalcUpdateRects (Pnt *old, Pnt *new, int size, MyRectangle update[], int *nUpdates)
419 /* If old = new (shouldn't happen) then nothing to draw */
420 if (old->x == new->x && old->y == new->y) {
424 /* Work out what bits overlap. Since we know the rects
425 are the same size we don't need a full intersect calc. */
427 /* Top or bottom edge? */
428 if (new->y > old->y) {
429 SetRect(&(update[count]), old->x, old->y, size, new->y - old->y);
431 } else if (old->y > new->y) {
432 SetRect(&(update[count]), old->x, old->y + size - (old->y - new->y),
433 size, old->y - new->y);
436 /* Left or right edge - don't overlap any update calculated above. */
437 if (new->x > old->x) {
438 SetRect(&(update[count]), old->x, Max(new->y, old->y),
439 new->x - old->x, size - abs(new->y - old->y));
441 } else if (old->x > new->x) {
442 SetRect(&(update[count]), new->x + size, Max(new->y, old->y),
443 old->x - new->x, size - abs(new->y - old->y));
450 /* Animate the movement of a single piece */
453 BeginAnimation (AnimNr anr, ChessSquare piece, ChessSquare bgPiece, int startColor, Pnt *start)
455 AnimState *anim = &anims[anr];
457 if(appData.upsideDown && flipView) piece += piece < BlackPawn ? BlackPawn : -BlackPawn;
458 /* The old buffer is initialised with the start square (empty) */
459 if(bgPiece == EmptySquare) {
460 DrawBlank(anr, start->x, start->y, startColor);
462 /* Kludge alert: When gating we want the introduced
463 piece to appear on the from square. To generate an
464 image of it, we draw it on the board, copy the image,
465 and draw the original piece again. */
466 if(piece != bgPiece) DrawSquare(anim->startBoardY, anim->startBoardX, bgPiece, 0);
467 CopyRectangle(anr, DISP, 2,
468 start->x, start->y, squareSize, squareSize,
469 0, 0); // [HGM] zh: unstack in stead of grab
470 if(piece != bgPiece) DrawSquare(anim->startBoardY, anim->startBoardX, piece, 0);
472 anim->prevFrame = *start;
474 SetDragPiece(anr, piece);
478 AnimationFrame (AnimNr anr, Pnt *frame, ChessSquare piece)
480 MyRectangle updates[4];
483 AnimState *anim = &anims[anr];
484 int count, i, x, y, w, h;
486 /* Save what we are about to draw into the new buffer */
487 CopyRectangle(anr, DISP, 0,
488 x = frame->x, y = frame->y, w = squareSize, h = squareSize,
491 /* Erase bits of the previous frame */
492 if (Intersect(&anim->prevFrame, frame, squareSize, &overlap, &pt)) {
493 /* Where the new frame overlapped the previous,
494 the contents in newBuf are wrong. */
495 CopyRectangle(anr, 2, 0,
496 overlap.x, overlap.y,
497 overlap.width, overlap.height,
499 /* Repaint the areas in the old that don't overlap new */
500 CalcUpdateRects(&anim->prevFrame, frame, squareSize, updates, &count);
501 for (i = 0; i < count; i++)
502 CopyRectangle(anr, 2, DISP,
503 updates[i].x - anim->prevFrame.x,
504 updates[i].y - anim->prevFrame.y,
505 updates[i].width, updates[i].height,
506 updates[i].x, updates[i].y);
507 /* [HGM] correct expose rectangle to encompass both overlapping squares */
508 if(x > anim->prevFrame.x) w += x - anim->prevFrame.x, x = anim->prevFrame.x;
509 else w += anim->prevFrame.x - x;
510 if(y > anim->prevFrame.y) h += y - anim->prevFrame.y, y = anim->prevFrame.y;
511 else h += anim->prevFrame.y - y;
513 /* Easy when no overlap */
514 CopyRectangle(anr, 2, DISP,
515 0, 0, squareSize, squareSize,
516 anim->prevFrame.x, anim->prevFrame.y);
517 GraphExpose(currBoard, anim->prevFrame.x, anim->prevFrame.y, squareSize, squareSize);
520 /* Save this frame for next time round */
521 CopyRectangle(anr, 0, 2,
522 0, 0, squareSize, squareSize,
524 anim->prevFrame = *frame;
526 /* Draw piece over original screen contents, not current,
527 and copy entire rect. Wipes out overlapping piece images. */
528 InsertPiece(anr, piece);
529 CopyRectangle(anr, 0, DISP,
530 0, 0, squareSize, squareSize,
532 GraphExpose(currBoard, x, y, w, h);
536 EndAnimation (AnimNr anr, Pnt *finish)
538 MyRectangle updates[4];
542 AnimState *anim = &anims[anr];
544 /* The main code will redraw the final square, so we
545 only need to erase the bits that don't overlap. */
546 if (Intersect(&anim->prevFrame, finish, squareSize, &overlap, &pt)) {
547 CalcUpdateRects(&anim->prevFrame, finish, squareSize, updates, &count);
548 for (i = 0; i < count; i++)
549 CopyRectangle(anr, 2, DISP,
550 updates[i].x - anim->prevFrame.x,
551 updates[i].y - anim->prevFrame.y,
552 updates[i].width, updates[i].height,
553 updates[i].x, updates[i].y);
555 CopyRectangle(anr, 2, DISP,
556 0, 0, squareSize, squareSize,
557 anim->prevFrame.x, anim->prevFrame.y);
562 FrameSequence (AnimNr anr, ChessSquare piece, int startColor, Pnt *start, Pnt *finish, Pnt frames[], int nFrames)
566 BeginAnimation(anr, piece, EmptySquare, startColor, start);
567 for (n = 0; n < nFrames; n++) {
568 AnimationFrame(anr, &(frames[n]), piece);
569 FrameDelay(appData.animSpeed);
571 EndAnimation(anr, finish);
575 AnimateAtomicCapture (Board board, int fromX, int fromY, int toX, int toY)
578 ChessSquare piece = board[fromY][toY];
579 board[fromY][toY] = EmptySquare;
580 DrawPosition(FALSE, board);
582 x = lineGap + ((BOARD_WIDTH-1)-toX) * (squareSize + lineGap);
583 y = lineGap + toY * (squareSize + lineGap);
585 x = lineGap + toX * (squareSize + lineGap);
586 y = lineGap + ((BOARD_HEIGHT-1)-toY) * (squareSize + lineGap);
588 for(i=1; i<4*kFactor; i++) {
589 int r = squareSize * 9 * i/(20*kFactor - 5);
590 DrawDot(1, x + squareSize/2 - r, y+squareSize/2 - r, 2*r);
591 FrameDelay(appData.animSpeed);
593 board[fromY][toY] = piece;
597 /* Main control logic for deciding what to animate and how */
600 AnimateMove (Board board, int fromX, int fromY, int toX, int toY)
603 int hop, x = toX, y = toY;
604 Pnt start, finish, mid;
605 Pnt frames[kFactor * 2 + 1];
606 int nFrames, startColor, endColor;
608 if(killX >= 0 && IS_LION(board[fromY][fromX])) Roar();
610 /* Are we animating? */
611 if (!appData.animate || appData.blindfold)
614 if(board[toY][toX] == WhiteRook && board[fromY][fromX] == WhiteKing ||
615 board[toY][toX] == BlackRook && board[fromY][fromX] == BlackKing ||
616 board[toY][toX] == WhiteKing && board[fromY][fromX] == WhiteRook || // [HGM] seirawan
617 board[toY][toX] == BlackKing && board[fromY][fromX] == BlackRook)
618 return; // [HGM] FRC: no animtion of FRC castlings, as to-square is not true to-square
620 if (fromY < 0 || fromX < 0 || toX < 0 || toY < 0) return;
621 piece = board[fromY][fromX];
622 if (piece >= EmptySquare) return;
624 if(killX >= 0) toX = killX, toY = killY; // [HGM] lion: first to kill square
631 hop = abs(fromX-toX) == 1 && abs(fromY-toY) == 2 || abs(fromX-toX) == 2 && abs(fromY-toY) == 1;
634 ScreenSquare(fromX, fromY, &start, &startColor);
635 ScreenSquare(toX, toY, &finish, &endColor);
638 /* Knight: make straight movement then diagonal */
639 if (abs(toY - fromY) < abs(toX - fromX)) {
640 mid.x = start.x + (finish.x - start.x) / 2;
644 mid.y = start.y + (finish.y - start.y) / 2;
647 mid.x = start.x + (finish.x - start.x) / 2;
648 mid.y = start.y + (finish.y - start.y) / 2;
651 /* Don't use as many frames for very short moves */
652 if (abs(toY - fromY) + abs(toX - fromX) <= 2)
653 Tween(&start, &mid, &finish, kFactor - 1, frames, &nFrames);
655 Tween(&start, &mid, &finish, kFactor, frames, &nFrames);
656 FrameSequence(Game, piece, startColor, &start, &finish, frames, nFrames);
657 if(Explode(board, fromX, fromY, toX, toY)) { // mark as damaged
659 for(i=0; i<BOARD_WIDTH; i++) for(j=0; j<BOARD_HEIGHT; j++)
660 if((i-toX)*(i-toX) + (j-toY)*(j-toY) < 6) damage[0][j][i] |= 1 + ((i-toX ^ j-toY) & 1);
663 /* Be sure end square is redrawn */
664 damage[0][toY][toX] |= True;
666 if(toX != x || toY != y) { fromX = toX; fromY = toY; toX = x; toY = y; goto again; } // second leg
670 ChangeDragPiece (ChessSquare piece)
672 anims[Player].dragPiece = piece;
673 SetDragPiece(Player, piece);
677 DragPieceMove (int x, int y)
681 /* Are we animating? */
682 if (!appData.animateDragging || appData.blindfold)
686 if (! anims[Player].dragActive)
688 /* Move piece, maintaining same relative position
689 of mouse within square */
690 corner.x = x - anims[Player].mouseDelta.x;
691 corner.y = y - anims[Player].mouseDelta.y;
692 AnimationFrame(Player, &corner, anims[Player].dragPiece);
694 if (appData.highlightDragging) {
696 BoardSquare(x, y, &boardX, &boardY);
697 SetHighlights(fromX, fromY, boardX, boardY);
703 DragPieceEnd (int x, int y)
705 int boardX, boardY, color;
708 /* Are we animating? */
709 if (!appData.animateDragging || appData.blindfold)
713 if (! anims[Player].dragActive)
715 /* Last frame in sequence is square piece is
716 placed on, which may not match mouse exactly. */
717 BoardSquare(x, y, &boardX, &boardY);
718 ScreenSquare(boardX, boardY, &corner, &color);
719 EndAnimation(Player, &corner);
721 /* Be sure end square is redrawn */
722 damage[0][boardY][boardX] = True;
724 /* This prevents weird things happening with fast successive
725 clicks which on my Sun at least can cause motion events
726 without corresponding press/release. */
727 anims[Player].dragActive = False;
731 DragPieceBegin (int x, int y, Boolean instantly)
733 int boardX, boardY, color;
736 /* Are we animating? */
737 if (!appData.animateDragging || appData.blindfold)
740 /* Figure out which square we start in and the
741 mouse position relative to top left corner. */
742 BoardSquare(x, y, &boardX, &boardY);
743 anims[Player].startBoardX = boardX;
744 anims[Player].startBoardY = boardY;
745 ScreenSquare(boardX, boardY, &corner, &color);
746 anims[Player].startSquare = corner;
747 anims[Player].startColor = color;
748 /* As soon as we start dragging, the piece will jump slightly to
749 be centered over the mouse pointer. */
750 anims[Player].mouseDelta.x = squareSize/2;
751 anims[Player].mouseDelta.y = squareSize/2;
752 /* Initialise animation */
753 anims[Player].dragPiece = PieceForSquare(boardX, boardY);
755 if (anims[Player].dragPiece >= 0 && anims[Player].dragPiece < EmptySquare) {
756 ChessSquare bgPiece = EmptySquare;
757 anims[Player].dragActive = True;
758 if(boardX == BOARD_RGHT+1 && PieceForSquare(boardX-1, boardY) > 1 ||
759 boardX == BOARD_LEFT-2 && PieceForSquare(boardX+1, boardY) > 1)
760 bgPiece = anims[Player].dragPiece;
761 if(gatingPiece != EmptySquare) bgPiece = gatingPiece;
762 BeginAnimation(Player, anims[Player].dragPiece, bgPiece, color, &corner);
763 /* Mark this square as needing to be redrawn. Note that
764 we don't remove the piece though, since logically (ie
765 as seen by opponent) the move hasn't been made yet. */
766 damage[0][boardY][boardX] = True;
768 anims[Player].dragActive = False;
772 /* Handle expose event while piece being dragged */
777 if (!anims[Player].dragActive || appData.blindfold)
780 /* What we're doing: logically, the move hasn't been made yet,
781 so the piece is still in it's original square. But visually
782 it's being dragged around the board. So we erase the square
783 that the piece is on and draw it at the last known drag point. */
784 DrawOneSquare(anims[Player].startSquare.x, anims[Player].startSquare.y,
785 EmptySquare, anims[Player].startColor, 0, NULL, NULL, 0);
786 AnimationFrame(Player, &anims[Player].prevFrame, anims[Player].dragPiece);
787 damage[0][anims[Player].startBoardY][anims[Player].startBoardX] = TRUE;
791 DrawSquare (int row, int column, ChessSquare piece, int do_flash)
793 int square_color, x, y, align=0;
795 char tString[3], bString[2];
798 /* Calculate delay in milliseconds (2-delays per complete flash) */
799 flash_delay = 500 / appData.flashRate;
802 x = lineGap + ((BOARD_WIDTH-1)-column) *
803 (squareSize + lineGap);
804 y = lineGap + row * (squareSize + lineGap);
806 x = lineGap + column * (squareSize + lineGap);
807 y = lineGap + ((BOARD_HEIGHT-1)-row) *
808 (squareSize + lineGap);
811 square_color = SquareColor(row, column);
813 bString[1] = bString[0] = NULLCHAR;
814 if (appData.showCoords && row == (flipView ? BOARD_HEIGHT-1 : 0)
815 && column >= BOARD_LEFT && column < BOARD_RGHT) {
816 bString[0] = 'a' + column - BOARD_LEFT;
817 align = 1; // coord in lower-right corner
819 if (appData.showCoords && column == (flipView ? BOARD_RGHT-1 : BOARD_LEFT)) {
820 snprintf(tString, 3, "%d", ONE - '0' + row);
821 align = 2; // coord in upper-left corner
823 if (column == (flipView ? BOARD_LEFT-1 : BOARD_RGHT) && piece > 1 ) {
824 snprintf(tString, 3, "%d", piece);
825 align = 3; // holdings count in upper-right corner
827 if (column == (flipView ? BOARD_RGHT : BOARD_LEFT-1) && piece > 1) {
828 snprintf(tString, 3, "%d", piece);
829 align = 4; // holdings count in upper-left corner
831 if(piece == DarkSquare) square_color = 2;
832 if(square_color == 2 || appData.blindfold) piece = EmptySquare;
834 if (do_flash && piece != EmptySquare && appData.flashCount > 0) {
835 for (i=0; i<appData.flashCount; ++i) {
836 DrawOneSquare(x, y, piece, square_color, 0, tString, bString, 0);
837 GraphExpose(currBoard, x, y, squareSize, squareSize);
838 FlashDelay(flash_delay);
839 DrawOneSquare(x, y, EmptySquare, square_color, 0, tString, bString, 0);
840 GraphExpose(currBoard, x, y, squareSize, squareSize);
841 FlashDelay(flash_delay);
844 DrawOneSquare(x, y, piece, square_color, partnerUp ? 0 : marker[row][column], tString, bString, align);
847 /* Returns 1 if there are "too many" differences between b1 and b2
848 (i.e. more than 1 move was made) */
850 too_many_diffs (Board b1, Board b2)
855 for (i=0; i<BOARD_HEIGHT; ++i) {
856 for (j=0; j<BOARD_WIDTH; ++j) {
857 if (b1[i][j] != b2[i][j]) {
858 if (++c > 4) /* Castling causes 4 diffs */
866 /* Matrix describing castling maneuvers */
867 /* Row, ColRookFrom, ColKingFrom, ColRookTo, ColKingTo */
868 static int castling_matrix[4][5] = {
869 { 0, 0, 4, 3, 2 }, /* 0-0-0, white */
870 { 0, 7, 4, 5, 6 }, /* 0-0, white */
871 { 7, 0, 4, 3, 2 }, /* 0-0-0, black */
872 { 7, 7, 4, 5, 6 } /* 0-0, black */
875 /* Checks whether castling occurred. If it did, *rrow and *rcol
876 are set to the destination (row,col) of the rook that moved.
878 Returns 1 if castling occurred, 0 if not.
880 Note: Only handles a max of 1 castling move, so be sure
881 to call too_many_diffs() first.
884 check_castle_draw (Board newb, Board oldb, int *rrow, int *rcol)
889 /* For each type of castling... */
890 for (i=0; i<4; ++i) {
891 r = castling_matrix[i];
893 /* Check the 4 squares involved in the castling move */
895 for (j=1; j<=4; ++j) {
896 if (newb[r[0]][r[j]] == oldb[r[0]][r[j]]) {
903 /* All 4 changed, so it must be a castling move */
913 DrawPosition (int repaint, Board board)
915 int i, j, do_flash, exposeAll = False;
916 static int lastFlipView = 0;
917 static int lastBoardValid[2] = {0, 0};
918 static Board lastBoard[2];
919 static char lastMarker[BOARD_RANKS][BOARD_FILES];
921 int nr = twoBoards*partnerUp;
923 if(DrawSeekGraph()) return; // [HGM] seekgraph: suppress any drawing if seek graph up
926 if (!lastBoardValid[nr]) return;
927 board = lastBoard[nr];
929 if (!lastBoardValid[nr] || (nr == 0 && lastFlipView != flipView)) {
930 MarkMenuItem("View.Flip View", flipView);
933 if(nr) { SlavePopUp(); SwitchWindow(0); } // [HGM] popup board if not yet popped up, and switch drawing to it.
936 * It would be simpler to clear the window with XClearWindow()
937 * but this causes a very distracting flicker.
940 if (!repaint && lastBoardValid[nr] && (nr == 1 || lastFlipView == flipView)) {
942 // if ( lineGap && IsDrawArrowEnabled())
945 /* If too much changes (begin observing new game, etc.), don't
947 do_flash = too_many_diffs(board, lastBoard[nr]) ? 0 : 1;
949 /* Special check for castling so we don't flash both the king
950 and the rook (just flash the king). */
952 if (check_castle_draw(board, lastBoard[nr], &rrow, &rcol)) {
953 /* Mark rook for drawing with NO flashing. */
954 damage[nr][rrow][rcol] |= 1;
958 /* First pass -- Draw (newly) empty squares and repair damage.
959 This prevents you from having a piece show up twice while it
960 is flashing on its new square */
961 for (i = 0; i < BOARD_HEIGHT; i++)
962 for (j = 0; j < BOARD_WIDTH; j++)
963 if (((board[i][j] != lastBoard[nr][i][j] || !nr && marker[i][j] != lastMarker[i][j]) && board[i][j] == EmptySquare)
964 || damage[nr][i][j]) {
965 DrawSquare(i, j, board[i][j], 0);
966 if(damage[nr][i][j] & 2) {
967 drawHighlight(j, i, 0); // repair arrow damage
968 if(lineGap) damage[nr][i][j] = False; // this flushed the square as well
969 } else damage[nr][i][j] = 1; // mark for expose
972 /* Second pass -- Draw piece(s) in new position and flash them */
973 for (i = 0; i < BOARD_HEIGHT; i++)
974 for (j = 0; j < BOARD_WIDTH; j++)
975 if (board[i][j] != lastBoard[nr][i][j] || !nr && marker[i][j] != lastMarker[i][j]) {
976 DrawSquare(i, j, board[i][j], do_flash);
977 damage[nr][i][j] = 1; // mark for expose
983 for (i = 0; i < BOARD_HEIGHT; i++)
984 for (j = 0; j < BOARD_WIDTH; j++) {
985 DrawSquare(i, j, board[i][j], 0);
986 damage[nr][i][j] = False;
992 CopyBoard(lastBoard[nr], board);
993 lastBoardValid[nr] = 1;
994 if(nr == 0) { // [HGM] dual: no highlights on second board yet
995 lastFlipView = flipView;
996 for (i = 0; i < BOARD_HEIGHT; i++)
997 for (j = 0; j < BOARD_WIDTH; j++)
998 lastMarker[i][j] = marker[i][j];
1000 /* Draw highlights */
1001 if (pm1X >= 0 && pm1Y >= 0) {
1002 drawHighlight(pm1X, pm1Y, 2);
1003 if(lineGap) damage[nr][pm1Y][pm1X] = False;
1005 if (pm2X >= 0 && pm2Y >= 0) {
1006 drawHighlight(pm2X, pm2Y, 2);
1007 if(lineGap) damage[nr][pm2Y][pm2X] = False;
1009 if (hi1X >= 0 && hi1Y >= 0) {
1010 drawHighlight(hi1X, hi1Y, 1);
1011 if(lineGap) damage[nr][hi1Y][hi1X] = False;
1013 if (hi2X >= 0 && hi2Y >= 0) {
1014 drawHighlight(hi2X, hi2Y, 1);
1015 if(lineGap) damage[nr][hi2Y][hi2X] = False;
1017 DrawArrowHighlight(hi1X, hi1Y, hi2X, hi2Y);
1019 else DrawArrowHighlight (board[EP_STATUS-3], board[EP_STATUS-4], board[EP_STATUS-1], board[EP_STATUS-2]);
1021 /* If piece being dragged around board, must redraw that too */
1025 GraphExpose(currBoard, 0, 0, BOARD_WIDTH*(squareSize + lineGap) + lineGap, BOARD_HEIGHT*(squareSize + lineGap) + lineGap);
1027 for (i = 0; i < BOARD_HEIGHT; i++)
1028 for (j = 0; j < BOARD_WIDTH; j++)
1029 if(damage[nr][i][j]) {
1032 x = lineGap + ((BOARD_WIDTH-1)-j) *
1033 (squareSize + lineGap);
1034 y = lineGap + i * (squareSize + lineGap);
1036 x = lineGap + j * (squareSize + lineGap);
1037 y = lineGap + ((BOARD_HEIGHT-1)-i) *
1038 (squareSize + lineGap);
1040 if(damage[nr][i][j] & 2) // damage by old or new arrow
1041 GraphExpose(currBoard, x - lineGap, y - lineGap, squareSize + 2*lineGap, squareSize + 2*lineGap);
1043 GraphExpose(currBoard, x, y, squareSize, squareSize);
1044 damage[nr][i][j] &= 2; // remember damage by newly drawn error in '2' bit, to schedule it for erasure next draw
1048 FlashDelay(0); // this flushes drawing queue;
1049 if(nr) SwitchWindow(1);
1052 /* [AS] Arrow highlighting support */
1054 static double A_WIDTH = 5; /* Width of arrow body */
1056 #define A_HEIGHT_FACTOR 6 /* Length of arrow "point", relative to body width */
1057 #define A_WIDTH_FACTOR 3 /* Width of arrow "point", relative to body width */
1068 return (int) (x + 0.5);
1072 SquareToPos (int rank, int file, int *x, int *y)
1075 *x = lineGap + ((BOARD_WIDTH-1)-file) * (squareSize + lineGap);
1076 *y = lineGap + rank * (squareSize + lineGap);
1078 *x = lineGap + file * (squareSize + lineGap);
1079 *y = lineGap + ((BOARD_HEIGHT-1)-rank) * (squareSize + lineGap);
1083 /* Draw an arrow between two points using current settings */
1085 DrawArrowBetweenPoints (int s_x, int s_y, int d_x, int d_y)
1088 double dx, dy, j, k, x, y;
1091 int h = (d_y > s_y) ? +A_WIDTH*A_HEIGHT_FACTOR : -A_WIDTH*A_HEIGHT_FACTOR;
1093 arrow[0].x = s_x + A_WIDTH + 0.5;
1096 arrow[1].x = s_x + A_WIDTH + 0.5;
1097 arrow[1].y = d_y - h;
1099 arrow[2].x = arrow[1].x + A_WIDTH*(A_WIDTH_FACTOR-1) + 0.5;
1100 arrow[2].y = d_y - h;
1105 arrow[5].x = arrow[1].x - 2*A_WIDTH + 0.5;
1106 arrow[5].y = d_y - h;
1108 arrow[4].x = arrow[5].x - A_WIDTH*(A_WIDTH_FACTOR-1) + 0.5;
1109 arrow[4].y = d_y - h;
1111 arrow[6].x = arrow[1].x - 2*A_WIDTH + 0.5;
1114 else if( d_y == s_y ) {
1115 int w = (d_x > s_x) ? +A_WIDTH*A_HEIGHT_FACTOR : -A_WIDTH*A_HEIGHT_FACTOR;
1118 arrow[0].y = s_y + A_WIDTH + 0.5;
1120 arrow[1].x = d_x - w;
1121 arrow[1].y = s_y + A_WIDTH + 0.5;
1123 arrow[2].x = d_x - w;
1124 arrow[2].y = arrow[1].y + A_WIDTH*(A_WIDTH_FACTOR-1) + 0.5;
1129 arrow[5].x = d_x - w;
1130 arrow[5].y = arrow[1].y - 2*A_WIDTH + 0.5;
1132 arrow[4].x = d_x - w;
1133 arrow[4].y = arrow[5].y - A_WIDTH*(A_WIDTH_FACTOR-1) + 0.5;
1136 arrow[6].y = arrow[1].y - 2*A_WIDTH + 0.5;
1139 /* [AS] Needed a lot of paper for this! :-) */
1140 dy = (double) (d_y - s_y) / (double) (d_x - s_x);
1141 dx = (double) (s_x - d_x) / (double) (s_y - d_y);
1143 j = sqrt( Sqr(A_WIDTH) / (1.0 + Sqr(dx)) );
1145 k = sqrt( Sqr(A_WIDTH*A_HEIGHT_FACTOR) / (1.0 + Sqr(dy)) );
1150 arrow[0].x = Round(x - j);
1151 arrow[0].y = Round(y + j*dx);
1153 arrow[1].x = Round(arrow[0].x + 2*j); // [HGM] prevent width to be affected by rounding twice
1154 arrow[1].y = Round(arrow[0].y - 2*j*dx);
1157 x = (double) d_x - k;
1158 y = (double) d_y - k*dy;
1161 x = (double) d_x + k;
1162 y = (double) d_y + k*dy;
1165 x = Round(x); y = Round(y); // [HGM] make sure width of shaft is rounded the same way on both ends
1167 arrow[6].x = Round(x - j);
1168 arrow[6].y = Round(y + j*dx);
1170 arrow[2].x = Round(arrow[6].x + 2*j);
1171 arrow[2].y = Round(arrow[6].y - 2*j*dx);
1173 arrow[3].x = Round(arrow[2].x + j*(A_WIDTH_FACTOR-1));
1174 arrow[3].y = Round(arrow[2].y - j*(A_WIDTH_FACTOR-1)*dx);
1179 arrow[5].x = Round(arrow[6].x - j*(A_WIDTH_FACTOR-1));
1180 arrow[5].y = Round(arrow[6].y + j*(A_WIDTH_FACTOR-1)*dx);
1183 DrawPolygon(arrow, 7);
1184 // Polygon( hdc, arrow, 7 );
1188 ArrowDamage (int s_col, int s_row, int d_col, int d_row)
1190 int hor, vert, i, n = partnerUp * twoBoards;
1191 hor = 64*s_col + 32; vert = 64*s_row + 32;
1192 for(i=0; i<= 64; i++) {
1193 damage[n][vert+6>>6][hor+6>>6] |= 2;
1194 damage[n][vert-6>>6][hor+6>>6] |= 2;
1195 damage[n][vert+6>>6][hor-6>>6] |= 2;
1196 damage[n][vert-6>>6][hor-6>>6] |= 2;
1197 hor += d_col - s_col; vert += d_row - s_row;
1201 /* [AS] Draw an arrow between two squares */
1203 DrawArrowBetweenSquares (int s_col, int s_row, int d_col, int d_row)
1205 int s_x, s_y, d_x, d_y;
1207 if( s_col == d_col && s_row == d_row ) {
1211 /* Get source and destination points */
1212 SquareToPos( s_row, s_col, &s_x, &s_y);
1213 SquareToPos( d_row, d_col, &d_x, &d_y);
1216 d_y += squareSize / 2 - squareSize / 4; // [HGM] round towards same centers on all sides!
1218 else if( d_y < s_y ) {
1219 d_y += squareSize / 2 + squareSize / 4;
1222 d_y += squareSize / 2;
1226 d_x += squareSize / 2 - squareSize / 4;
1228 else if( d_x < s_x ) {
1229 d_x += squareSize / 2 + squareSize / 4;
1232 d_x += squareSize / 2;
1235 s_x += squareSize / 2;
1236 s_y += squareSize / 2;
1239 A_WIDTH = squareSize / 14.; //[HGM] make float
1241 DrawArrowBetweenPoints( s_x, s_y, d_x, d_y );
1242 ArrowDamage(s_col, s_row, d_col, d_row);
1246 IsDrawArrowEnabled ()
1248 return (appData.highlightMoveWithArrow || twoBoards && partnerUp) && squareSize >= 32;
1252 DrawArrowHighlight (int fromX, int fromY, int toX,int toY)
1254 if( IsDrawArrowEnabled() && fromX >= 0 && fromY >= 0 && toX >= 0 && toY >= 0)
1255 DrawArrowBetweenSquares(fromX, fromY, toX, toY);