From 3df80ed59a0807f0676190c3bc33d6aad0ac5ad9 Mon Sep 17 00:00:00 2001
From: Jesse McDonald <nybble41@gmail.com>
Date: Mon, 23 Mar 2020 01:53:53 -0500
Subject: [PATCH] add basic animations

---
 js/pacosako_ui.js | 85 ++++++++++++++++++++++++++++++++++++-----------
 1 file changed, 65 insertions(+), 20 deletions(-)

diff --git a/js/pacosako_ui.js b/js/pacosako_ui.js
index 21c2e2b..6268a6c 100644
--- a/js/pacosako_ui.js
+++ b/js/pacosako_ui.js
@@ -127,6 +127,7 @@ $(function (){
       const code = pieceCode(side, type);
       const piece_id = 'cb_piece_' + code + '_' + suffix;
       const piece = $($('#' + piece_id)[0] || $('#cb_piece_' + code + ' img').clone());
+      piece.stop(true);
       piece.attr('id', piece_id);
       piece.removeClass('cb-selected');
       piece.removeAttr('style');
@@ -145,7 +146,8 @@ $(function (){
       return piece;
    }
 
-   function renderBoard() {
+   function renderBoard(animate) {
+      $('#cb_board .cb-piece').stop(true);
       $('#cb_board .cb-piece').off('click.select');
       $('#cb_board .cb-piece').off('click.unselect');
       $('#cb_board .cb-square').off('click.destination');
@@ -184,30 +186,66 @@ $(function (){
          if (lastMove.to) {
             cbSquare(lastMove.to).addClass('cb-end');
          }
+
+         if (lastMove.from && lastMove.to && animate) {
+            let pieces = cbSquare(lastMove.to).find('.cb-piece');
+            if (!lastMove.alongside) {
+               pieces = pieces.filter(lastMove.side === PS.LIGHT ? '.cb-lt-piece' : '.cb-dk-piece');
+            }
+            if (pieces.length > 0) {
+               const fromRect = cbSquare(lastMove.from)[0].getBoundingClientRect();
+               const toRect = cbSquare(lastMove.to)[0].getBoundingClientRect();
+               const movedDown = toRect.top - fromRect.top;
+               const movedRight = toRect.left - fromRect.left;
+               for (const domPiece of pieces) {
+                  const piece = $(domPiece);
+                  const originalTop = parseFloat(piece.css('top'));
+                  const originalLeft = parseFloat(piece.css('left'));
+                  const originalStyle = piece.attr('style') || null;
+                  piece.css({
+                     'z-index': 100,
+                     'top': originalTop - movedDown,
+                     'left': originalLeft - movedRight,
+                  }).animate({
+                     'top': originalTop,
+                     'left': originalLeft,
+                  }, {
+                     always: function() {
+                        piece.attr('style', originalStyle);
+                     },
+                  });
+               }
+            }
+         }
       }
 
       const liveView = !game.canRedo;
       const playing = game.status === PS.PLAYING;
 
-      /* only enable selection / drag-and-drop in the live view */
-      if (liveView && playing) {
-         const phantom = board.phantom;
-         if (phantom) {
-            const piece = placePiece(PS.PHANTOM, phantom.side, phantom.type, 'ph');
-            cbSquare(PS.PHANTOM).appendTo(cbSquare(phantom.from));
+      const phantom = board.phantom;
+      if (phantom) {
+         const piece = placePiece(PS.PHANTOM, phantom.side, phantom.type, 'ph');
+         cbSquare(PS.PHANTOM).appendTo(cbSquare(phantom.from));
+
+         if (liveView && playing) {
             piece.draggable('enable');
             piece.addClass('cb-selected');
             pieceStartMove(piece, 'click');
-         } else if (game.status === PS.PLAYING) {
-            const clss = game.player === PS.LIGHT ? '.cb-lt-piece' : '.cb-dk-piece';
-            const pieces = $('#cb_board ' + clss)
-            pieces.on('click.select', pieceClickSelect);
-            pieces.draggable('enable');
          }
+      } else if (liveView && playing) {
+         const clss = game.player === PS.LIGHT ? '.cb-lt-piece' : '.cb-dk-piece';
+         const pieces = $('#cb_board ' + clss)
+         pieces.on('click.select', pieceClickSelect);
+         pieces.draggable('enable');
       }
 
       let msg = '';
       let winner = game.winner;
+
+      if (!liveView) {
+         msg += '(Move ' + String(game.moves.length) + ' of ' + String(currentGame.moves.length) + ') ';
+      }
+
       if (winner) {
          if (lastMove && lastMove.resign) {
             msg += (lastMove.side === PS.LIGHT ? 'Light' : 'Dark') + ' player resigned. ';
@@ -240,13 +278,13 @@ $(function (){
       }
    }
 
-   function setCurrentBoard(game) {
+   function setCurrentBoard(game, animate) {
       currentGame = game;
 
       /* navigation should not include the redo stack */
       visibleGame = new PS.Game(game);
       visibleGame.clearRedo();
-      renderBoard();
+      renderBoard(animate);
 
       const moves = game.moves;
 
@@ -361,6 +399,13 @@ $(function (){
             if (d && d.board) {
                try {
                   const moves = JSON.parse(d.board);
+                  const oldState = { past: currentGame.moves, future: currentGame.redoMoves };
+
+                  if (deepEqual(moves, oldState)) {
+                     /* we already have this */
+                     return;
+                  }
+
                   debug('got board', moves);
 
                   const newGame = new PS.Game();
@@ -379,7 +424,7 @@ $(function (){
                      newGame.undo();
                   }
 
-                  setCurrentBoard(newGame);
+                  setCurrentBoard(newGame, moves.past.length > currentGame.moves.length);
                } catch (err) {
                   debug('Error replaying board state', err);
                }
@@ -579,7 +624,7 @@ $(function (){
       if (currentGame.canRedo) {
          currentGame.redo();
          $('#cb_board').data('last_state', currentGame.moves);
-         setCurrentBoard(currentGame);
+         setCurrentBoard(currentGame, true);
          putState();
       }
    });
@@ -627,7 +672,7 @@ $(function (){
       if (visibleGame.canRedo) {
          visibleGame.redo();
       }
-      renderBoard();
+      renderBoard(true);
    });
 
    $('#cb_nav_next_turn').on('click', function(){
@@ -638,14 +683,14 @@ $(function (){
             break;
          }
       }
-      renderBoard();
+      renderBoard(true);
    });
 
    $('#cb_nav_last').on('click', function(){
       while (visibleGame.canRedo) {
          visibleGame.redo();
       }
-      renderBoard();
+      renderBoard(true);
    });
 
    $('#cb_select_game').on('change', function(){
@@ -692,7 +737,7 @@ $(function (){
             const lightName = shortenName(String(d.lightName || 'Light'));
             const darkName = shortenName(String(d.darkName || 'Dark'));
             const moves = !d.moves ? '' :
-               (', ' + d.moves + (d.moves === 1 ? ' move' : ' moves'));
+               (', ' + d.moves + (d.moves === 1 ? ' turn' : ' turns'));
 
             let opt = $('#cb_game_' + key);