6 files changed, 181 insertions, 84 deletions

@@ -1,3 +1,20 @@
+var SYM_TYPE_NONE               = 0
+var SYM_TYPE_HORIZONTAL         = 1
+var SYM_TYPE_VERTICAL           = 2
+var SYM_TYPE_ROTATIONAL         = 3
+var SYM_TYPE_ROTATE_LEFT        = 4
+var SYM_TYPE_ROTATE_RIGHT       = 5
+var SYM_TYPE_FLIP_XY            = 6
+var SYM_TYPE_FLIP_NEG_XY        = 7
+var SYM_TYPE_PARALLEL_H         = 8
+var SYM_TYPE_PARALLEL_V         = 9
+var SYM_TYPE_PARALLEL_H_FLIP    = 10
+var SYM_TYPE_PARALLEL_V_FLIP    = 11
+var SYM_TYPE_PILLAR_PARALLEL    = 12
+var SYM_TYPE_PILLAR_HORIZONTAL  = 13
+var SYM_TYPE_PILLAR_VERTICAL    = 14
+var SYM_TYPE_PILLAR_ROTATIONAL  = 15
+
 namespace(function() {
 
 window.draw = function(puzzle, target='puzzle') {
@@ -260,7 +277,7 @@ function drawStartAndEnd(puzzle, svg) {
 
       if (cell.start === true) {
         var symStart = null
-        if (puzzle.symmetry != null) {
+        if (puzzle.symType != SYM_TYPE_NONE) {
           var sym = puzzle.getSymmetricalPos(x, y)
           window.drawSymbolWithSvg(svg, {
             'type': 'start',
@@ -123,6 +123,7 @@ window.Puzzle = class {
     }
     puzzle.pillar = parsed.pillar
     puzzle.symmetry = parsed.symmetry
+    puzzle.symType = parsed.symType
     puzzle.largezero = puzzle.width * puzzle.height
     return puzzle
   }
@@ -185,36 +186,63 @@ window.Puzzle = class {
   }
 
   getSymmetricalDir(dir) {
-    if (this.symmetry != null) {
-      if (this.symmetry.x === true) {
-        if (dir === 'left') return 'right'
-        if (dir === 'right') return 'left'
-      }
-      if (this.symmetry.y === true) {
-        if (dir === 'top') return 'bottom'
-        if (dir === 'bottom') return 'top'
-      }
+    if (this.symType == SYM_TYPE_VERTICAL || this.symType == SYM_TYPE_ROTATIONAL || this.symType == SYM_TYPE_PARALLEL_H_FLIP) {
+      if (dir === 'left') return 'right'
+      if (dir === 'right') return 'left'
+    }
+    if (this.symType == SYM_TYPE_HORIZONTAL || this.symType == SYM_TYPE_ROTATIONAL || this.symType == SYM_TYPE_PARALLEL_V_FLIP) {
+      if (dir === 'top') return 'bottom'
+      if (dir === 'bottom') return 'top'
+    }
+    if (this.symType == SYM_TYPE_ROTATE_LEFT || this.symType == SYM_TYPE_FLIP_NEG_XY) {
+      if (dir === 'left') return 'bottom'
+      if (dir === 'right') return 'top'
+    }
+    if (this.symType == SYM_TYPE_ROTATE_RIGHT || this.symType == SYM_TYPE_FLIP_NEG_XY) {
+      if (dir === 'top') return 'right'
+      if (dir === 'bottom') return 'left'
+    }
+    if (this.symType == SYM_TYPE_ROTATE_LEFT || this.symType == SYM_TYPE_FLIP_XY) {
+      if (dir === 'top') return 'left'
+      if (dir === 'bottom') return 'right'
+    }
+    if (this.symType == SYM_TYPE_ROTATE_RIGHT || this.symType == SYM_TYPE_FLIP_XY) {
+      if (dir === 'right') return 'bottom'
+      if (dir === 'left') return 'top'
     }
     return dir
   }
 
   // The resulting position is guaranteed to be gridsafe.
   getSymmetricalPos(x, y) {
-    if (this.symmetry != null) {
-      if (this.pillar === true) {
-        x += this.width/2
-        if (this.symmetry.x === true) {
-          x = this.width - x
-        }
-      } else {
-        if (this.symmetry.x === true) {
-          x = (this.width - 1) - x
-        }
-      }
-      if (this.symmetry.y === true) {
-        y = (this.height - 1) - y
-      }
+    var origx = x
+    var origy = y
+
+    if (this.symType == SYM_TYPE_VERTICAL || this.symType == SYM_TYPE_ROTATIONAL || this.symType == SYM_TYPE_PARALLEL_H_FLIP) {
+      x = (this.width - 1) - origx
+    }
+    if (this.symType == SYM_TYPE_HORIZONTAL || this.symType == SYM_TYPE_ROTATIONAL || this.symType == SYM_TYPE_PARALLEL_V_FLIP) {
+      y = (this.height - 1) - origy
+    }
+    if (this.symType == SYM_TYPE_ROTATE_LEFT || this.symType == SYM_TYPE_FLIP_XY) {
+      x = origy
+    }
+    if (this.symType == SYM_TYPE_ROTATE_RIGHT || this.symType == SYM_TYPE_FLIP_XY) {
+      y = origx
     }
+    if (this.symType == SYM_TYPE_ROTATE_LEFT || this.symType == SYM_TYPE_FLIP_NEG_XY) {
+      y = (this.width - 1) - origx
+    }
+    if (this.symType == SYM_TYPE_ROTATE_RIGHT || this.symType == SYM_TYPE_FLIP_NEG_XY) {
+      x = (this.height - 1) - origy
+    }
+    if (this.symType == SYM_TYPE_PARALLEL_H || this.symType == SYM_TYPE_PARALLEL_H_FLIP) {
+      y = (origy == this.height / 2) ? (this.height / 2) : ((origy + (this.height + 1) / 2) % (this.height + 1))
+    }
+    if (this.symType == SYM_TYPE_PARALLEL_V || this.symType == SYM_TYPE_PARALLEL_V_FLIP) {
+      x = (origx == this.width / 2) ? (this.width / 2) : ((origx + (this.width + 1) / 2) % (this.width + 1))
+    }
+
     return {'x':this._mod(x), 'y':y}
   }
 
@@ -46,6 +46,8 @@ window.serializePuzzle = function(puzzle) {
   if (puzzle.settings.INVISIBLE_SYMMETRY)         settingsFlags |= SETTINGS_FLAG_IS
   s.writeByte(settingsFlags)
 
+  s.writeByte(puzzle.symType)
+
   return s.str()
 }
 
@@ -64,10 +66,16 @@ window.deserializePuzzle = function(data) {
 
   var genericFlags = s.readByte()
   puzzle.autoSolved = genericFlags & GENERIC_FLAG_AUTOSOLVED
+  puzzle.symType = SYM_TYPE_NONE
   if ((genericFlags & GENERIC_FLAG_SYMMETRICAL) != 0) {
-    puzzle.symmetry = {
-      'x': ((genericFlags & GENERIC_FLAG_SYMMETRY_X) != 0),
-      'y': ((genericFlags & GENERIC_FLAG_SYMMETRY_Y) != 0),
+    if ((genericFlags & GENERIC_FLAG_SYMMETRY_X) != 0) {
+      if ((genericFlags & GENERIC_FLAG_SYMMETRY_Y) != 0) {
+        puzzle.symType = SYM_TYPE_ROTATIONAL
+      } else {
+        puzzle.symType = SYM_TYPE_VERTICAL
+      }
+    } else if ((genericFlags & GENERIC_FLAG_SYMMETRY_Y) != 0) {
+      puzzle.symType = SYM_TYPE_HORIZONTAL
     }
   }
   puzzle.pillar = (genericFlags & GENERIC_FLAG_PILLAR) != 0
@@ -97,6 +105,10 @@ window.deserializePuzzle = function(data) {
     INVISIBLE_SYMMETRY:         (settingsFlags & SETTINGS_FLAG_IS) != 0,
   }
 
+  if (s.hasLeft(1)) {
+    puzzle.symType = s.readByte()
+  }
+
   s.destroy()
   return puzzle
 }
@@ -138,6 +150,10 @@ class Serializer {
     if (this.data.length < numBytes) throw Error('Cannot read ' + numBytes + ' bytes from a stream with only '+ this.data.length + ' bytes')
   }
 
+  hasLeft(numBytes = 1) {
+    return ((this.data.length - this.index) >= numBytes)
+  }
+
   readByte() {
     this._checkRead()
     return this.data.charCodeAt(this.index++)
@@ -28,7 +28,7 @@ function countNodes(x, y, depth) {
   if (cell.gap > window.GAP_NONE) return
   if (cell.line !== window.LINE_NONE) return
 
-  if (puzzle.symmetry == null) {
+  if (puzzle.symType == SYM_TYPE_NONE) {
     puzzle.updateCell2(x, y, 'line', window.LINE_BLACK)
   } else {
     var sym = puzzle.getSymmetricalPos(x, y)
@@ -84,7 +84,7 @@ window.solve = function(p, partialCallback, finalCallback) {
   // Puzzles which are small enough should be solved synchronously, since the cost of asynchronizing
   // is greater than the cost of the puzzle.
   SOLVE_SYNC = false
-  if (puzzle.symmetry != null) { // 5x5 is the max for symmetry puzzles
+  if (puzzle.symType != SYM_TYPE_NONE) { // 5x5 is the max for symmetry puzzles
     if (puzzle.width * puzzle.height <= 121) SOLVE_SYNC = true
   } else if (puzzle.pillar === true) { // 4x5 is the max for non-symmetry, pillar puzzles
     if (puzzle.width * puzzle.height <= 108) SOLVE_SYNC = true
@@ -207,7 +207,7 @@ function taskLoop(partialCallback, finalCallback) {
 function tailRecurse(x, y) {
   // Tail recursion: Back out of this cell
   puzzle.updateCell2(x, y, 'line', window.LINE_NONE)
-  if (puzzle.symmetry != null) {
+  if (puzzle.symType != SYM_TYPE_NONE) {
     var sym = puzzle.getSymmetricalPos(x, y)
     puzzle.updateCell2(sym.x, sym.y, 'line', window.LINE_NONE)
   }
@@ -227,7 +227,7 @@ function solveLoop(x, y, numEndpoints, earlyExitData) {
   if (cell.gap > window.GAP_NONE) return
   if (cell.line !== window.LINE_NONE) return
 
-  if (puzzle.symmetry == null) {
+  if (puzzle.symType == SYM_TYPE_NONE) {
     puzzle.updateCell2(x, y, 'line', window.LINE_BLACK)
   } else {
     var sym = puzzle.getSymmetricalPos(x, y)
@@ -379,7 +379,7 @@ window.drawPathNoUI = function(puzzle, path) {
     x += dx
     y += dy
     // Set the cell color
-    if (puzzle.symmetry == null) {
+    if (puzzle.symType == SYM_TYPE_NONE) {
       cell.line = window.LINE_BLACK
     } else {
       cell.line = window.LINE_BLUE
@@ -457,7 +457,7 @@ window.drawPath = function(puzzle, path, target='puzzle') {
     // Unflag the cell, move into it, and reflag it
     cell.line = window.LINE_NONE
     window.onMove(41 * dx, 41 * dy)
-    if (puzzle.symmetry == null) {
+    if (puzzle.symType == SYM_TYPE_NONE) {
       cell.line = window.LINE_BLACK
     } else {
       cell.line = window.LINE_BLUE
@@ -15,7 +15,7 @@ class BoundingBox {
       data.svg.appendChild(this.debug)
       this.debug.setAttribute('opacity', 0.5)
       this.debug.setAttribute('style', 'pointer-events: none;')
-      if (data.puzzle.symmetry == null) {
+      if (data.puzzle.symType == SYM_TYPE_NONE) {
         this.debug.setAttribute('fill', 'white')
       } else {
         if (this.sym !== true) {
@@ -120,7 +120,7 @@ class PathSegment {
       }
     }
 
-    if (data.puzzle.symmetry == null) {
+    if (data.puzzle.symType == SYM_TYPE_NONE) {
       this.poly1.setAttribute('class', 'line-1 ' + data.svg.id)
       this.circ.setAttribute('class', 'line-1 ' + data.svg.id)
       this.poly2.setAttribute('class', 'line-1 ' + data.svg.id)
@@ -174,7 +174,7 @@ class PathSegment {
     if (this.dir === MOVE_NONE) { // Start point
       this.circ.setAttribute('r', 24)
       this.circ.setAttribute('class', this.circ.getAttribute('class') + ' start')
-      if (data.puzzle.symmetry != null) {
+      if (data.puzzle.symType != SYM_TYPE_NONE) {
         this.symCirc.setAttribute('r', 24)
         this.symCirc.setAttribute('class', this.symCirc.getAttribute('class') + ' start')
       }
@@ -182,7 +182,7 @@ class PathSegment {
       // Only insert poly1 in non-startpoints
       data.svg.insertBefore(this.poly1, data.cursor)
       this.circ.setAttribute('r', 12)
-      if (data.puzzle.symmetry != null) {
+      if (data.puzzle.symType != SYM_TYPE_NONE) {
         data.svg.insertBefore(this.symPoly1, data.cursor)
         this.symCirc.setAttribute('r', 12)
       }
@@ -194,7 +194,7 @@ class PathSegment {
     data.svg.removeChild(this.circ)
     data.svg.removeChild(this.poly2)
     data.svg.removeChild(this.pillarCirc)
-    if (data.puzzle.symmetry != null) {
+    if (data.puzzle.symType != SYM_TYPE_NONE) {
       data.svg.removeChild(this.symPoly1)
       data.svg.removeChild(this.symCirc)
       data.svg.removeChild(this.symPoly2)
@@ -208,19 +208,19 @@ class PathSegment {
     var y = clamp(data.y, data.bbox.y1, data.bbox.y2)
     data.cursor.setAttribute('cx', x)
     data.cursor.setAttribute('cy', y)
-    if (data.puzzle.symmetry != null) {
-      data.symcursor.setAttribute('cx', this._reflX(x))
-      data.symcursor.setAttribute('cy', this._reflY(y))
+    if (data.puzzle.symType != SYM_TYPE_NONE) {
+      data.symcursor.setAttribute('cx', this._reflX(x,y))
+      data.symcursor.setAttribute('cy', this._reflY(x,y))
     }
     if (data.puzzle.pillar === true) {
       if (this.pillarCirc.getAttribute('static') == null) {
         this.pillarCirc.setAttribute('cx', x)
         this.pillarCirc.setAttribute('cy', y)
       }
-      if (data.puzzle.symmetry != null) {
+      if (data.puzzle.symType != SYM_TYPE_NONE) {
         if (this.symPillarCirc.getAttribute('static') == null) {
-          this.symPillarCirc.setAttribute('cx', this._reflX(x))
-          this.symPillarCirc.setAttribute('cy', this._reflY(y))
+          this.symPillarCirc.setAttribute('cx', this._reflX(x,y))
+          this.symPillarCirc.setAttribute('cy', this._reflY(x,y))
         }
       }
     }
@@ -296,19 +296,19 @@ class PathSegment {
     }
 
     // Draw the symmetrical path based on the original one
-    if (data.puzzle.symmetry != null) {
+    if (data.puzzle.symType != SYM_TYPE_NONE) {
       this.symPoly1.setAttribute('points',
-        this._reflX(points1.x2) + ' ' + this._reflY(points1.y2) + ',' +
-        this._reflX(points1.x2) + ' ' + this._reflY(points1.y1) + ',' +
-        this._reflX(points1.x1) + ' ' + this._reflY(points1.y1) + ',' +
-        this._reflX(points1.x1) + ' ' + this._reflY(points1.y2)
+        this._reflX(points1.x2, points1.y2) + ' ' + this._reflY(points1.x2, points1.y2) + ',' +
+        this._reflX(points1.x2, points1.y2) + ' ' + this._reflY(points1.x1, points1.y1) + ',' +
+        this._reflX(points1.x1, points1.y1) + ' ' + this._reflY(points1.x1, points1.y1) + ',' +
+        this._reflX(points1.x1, points1.y1) + ' ' + this._reflY(points1.x2, points1.y2)
       )
 
       this.symPoly2.setAttribute('points',
-        this._reflX(points2.x2) + ' ' + this._reflY(points2.y2) + ',' +
-        this._reflX(points2.x2) + ' ' + this._reflY(points2.y1) + ',' +
-        this._reflX(points2.x1) + ' ' + this._reflY(points2.y1) + ',' +
-        this._reflX(points2.x1) + ' ' + this._reflY(points2.y2)
+        this._reflX(points2.x2, points2.y2) + ' ' + this._reflY(points2.x2, points2.y2) + ',' +
+        this._reflX(points2.x2, points2.y2) + ' ' + this._reflY(points2.x1, points2.y1) + ',' +
+        this._reflX(points2.x1, points2.y1) + ' ' + this._reflY(points2.x1, points2.y1) + ',' +
+        this._reflX(points2.x1, points2.y1) + ' ' + this._reflY(points2.x2, points2.y2)
       )
 
       this.symCirc.setAttribute('opacity', this.circ.getAttribute('opacity'))
@@ -316,24 +316,46 @@ class PathSegment {
     }
   }
 
-  _reflX(x) {
-    if (data.puzzle.symmetry == null) return x
-    if (data.puzzle.symmetry.x === true) {
+  _reflX(x,y) {
+    if (data.puzzle.symType == SYM_TYPE_NONE) return x
+
+    if (data.puzzle.symType == SYM_TYPE_VERTICAL || data.puzzle.symType == SYM_TYPE_ROTATIONAL || data.puzzle.symType == SYM_TYPE_PARALLEL_H_FLIP) {
       // Mirror position inside the bounding box
       return (data.bbox.middle.x - x) + data.symbbox.middle.x
     }
-    // Copy position inside the bounding box
-    return (x - data.bbox.middle.x) + data.symbbox.middle.x
+    if (data.puzzle.symType == SYM_TYPE_HORIZONTAL || data.puzzle.symType == SYM_TYPE_PARALLEL_H || data.puzzle.symType == SYM_TYPE_PARALLEL_V || data.puzzle.symType == SYM_TYPE_PARALLEL_V_FLIP) {
+      // Copy position inside the bounding box
+      return (x - data.bbox.middle.x) + data.symbbox.middle.x
+    }
+    if (data.puzzle.symType == SYM_TYPE_ROTATE_LEFT || data.puzzle.symType == SYM_TYPE_FLIP_XY) {
+      // Rotate position left inside the bounding box
+      return (y - data.bbox.middle.y) + data.symbbox.middle.x
+    }
+    if (data.puzzle.symType == SYM_TYPE_ROTATE_RIGHT || data.puzzle.symType == SYM_TYPE_FLIP_NEG_XY) {
+      // Rotate position right inside the bounding box
+      return (data.bbox.middle.y - y) + data.symbbox.middle.x
+    }
   }
 
-  _reflY(y) {
-    if (data.puzzle.symmetry == null) return y
-    if (data.puzzle.symmetry.y === true) {
+  _reflY(x,y) {
+    if (data.puzzle.symType == SYM_TYPE_NONE) return y
+
+    if (data.puzzle.symType == SYM_TYPE_HORIZONTAL || data.puzzle.symType == SYM_TYPE_ROTATIONAL || data.puzzle.symType == SYM_TYPE_PARALLEL_V_FLIP) {
       // Mirror position inside the bounding box
       return (data.bbox.middle.y - y) + data.symbbox.middle.y
     }
-    // Copy position inside the bounding box
-    return (y - data.bbox.middle.y) + data.symbbox.middle.y
+    if (data.puzzle.symType == SYM_TYPE_VERTICAL || data.puzzle.symType == SYM_TYPE_PARALLEL_V || data.puzzle.symType == SYM_TYPE_PARALLEL_H || data.puzzle.symType == SYM_TYPE_PARALLEL_H_FLIP) {
+      // Copy position inside the bounding box
+      return (y - data.bbox.middle.y) + data.symbbox.middle.y
+    }
+    if (data.puzzle.symType == SYM_TYPE_ROTATE_RIGHT || data.puzzle.symType == SYM_TYPE_FLIP_XY) {
+      // Rotate position left inside the bounding box
+      return (x - data.bbox.middle.x) + data.symbbox.middle.y
+    }
+    if (data.puzzle.symType == SYM_TYPE_ROTATE_LEFT || data.puzzle.symType == SYM_TYPE_FLIP_NEG_XY) {
+      // Rotate position right inside the bounding box
+      return (data.bbox.middle.x - x) + data.symbbox.middle.y
+    }
   }
 }
 
@@ -359,15 +381,29 @@ function clearGrid(svg, puzzle) {
 
 // This copy is an exact copy of puzzle.getSymmetricalDir, except that it uses MOVE_* values instead of strings
 function getSymmetricalDir(puzzle, dir) {
-  if (puzzle.symmetry != null) {
-    if (puzzle.symmetry.x === true) {
-      if (dir === MOVE_LEFT) return MOVE_RIGHT
-      if (dir === MOVE_RIGHT) return MOVE_LEFT
-    }
-    if (puzzle.symmetry.y === true) {
-      if (dir === MOVE_TOP) return MOVE_BOTTOM
-      if (dir === MOVE_BOTTOM) return MOVE_TOP
-    }
+  if (puzzle.symType == SYM_TYPE_VERTICAL || puzzle.symType == SYM_TYPE_ROTATIONAL || puzzle.symType == SYM_TYPE_PARALLEL_H_FLIP) {
+    if (dir === MOVE_LEFT) return MOVE_RIGHT
+    if (dir === MOVE_RIGHT) return MOVE_LEFT
+  }
+  if (puzzle.symType == SYM_TYPE_HORIZONTAL || puzzle.symType == SYM_TYPE_ROTATIONAL || puzzle.symType == SYM_TYPE_PARALLEL_V_FLIP) {
+    if (dir === MOVE_TOP) return MOVE_BOTTOM
+    if (dir === MOVE_BOTTOM) return MOVE_TOP
+  }
+  if (puzzle.symType == SYM_TYPE_ROTATE_LEFT || puzzle.symType == SYM_TYPE_FLIP_NEG_XY) {
+    if (dir === MOVE_LEFT) return MOVE_BOTTOM
+    if (dir === MOVE_RIGHT) return MOVE_TOP
+  }
+  if (puzzle.symType == SYM_TYPE_ROTATE_RIGHT || puzzle.symType == SYM_TYPE_FLIP_NEG_XY) {
+    if (dir === MOVE_TOP) return MOVE_RIGHT
+    if (dir === MOVE_BOTTOM) return MOVE_LEFT
+  }
+  if (puzzle.symType == SYM_TYPE_ROTATE_LEFT || puzzle.symType == SYM_TYPE_FLIP_XY) {
+    if (dir === MOVE_TOP) return MOVE_LEFT
+    if (dir === MOVE_BOTTOM) return MOVE_RIGHT
+  }
+  if (puzzle.symType == SYM_TYPE_ROTATE_RIGHT || puzzle.symType == SYM_TYPE_FLIP_XY) {
+    if (dir === MOVE_RIGHT) return MOVE_BOTTOM
+    if (dir === MOVE_LEFT) return MOVE_TOP
   }
   return dir
 }
@@ -495,7 +531,7 @@ window.onTraceStart = function(puzzle, pos, svg, start, symStart=null) {
   clearAnimations()
 
   // Add initial line segments + secondary symmetry cursor, if needed
-  if (puzzle.symmetry == null) {
+  if (puzzle.symType == SYM_TYPE_NONE) {
     data.puzzle.updateCell2(data.pos.x, data.pos.y, 'type', 'line')
     data.puzzle.updateCell2(data.pos.x, data.pos.y, 'line', window.LINE_BLACK)
   } else {
@@ -641,7 +677,7 @@ window.onMove = function(dx, dy) {
                  || (moveDir === MOVE_TOP && lastDir === MOVE_BOTTOM)
                  || (moveDir === MOVE_BOTTOM && lastDir === MOVE_TOP))
 
-    if (data.puzzle.symmetry != null) {
+    if (data.puzzle.symType != SYM_TYPE_NONE) {
       var symMoveDir = getSymmetricalDir(data.puzzle, moveDir)
     }
 
@@ -649,21 +685,21 @@ window.onMove = function(dx, dy) {
     if (backedUp) {
       data.path.pop().destroy()
       data.puzzle.updateCell2(data.pos.x, data.pos.y, 'line', window.LINE_NONE)
-      if (data.puzzle.symmetry != null) {
+      if (data.puzzle.symType != SYM_TYPE_NONE) {
         data.puzzle.updateCell2(data.sym.x, data.sym.y, 'line', window.LINE_NONE)
       }
     }
 
     // Move to the next cell
     changePos(data.bbox, data.pos, moveDir)
-    if (data.puzzle.symmetry != null) {
+    if (data.puzzle.symType != SYM_TYPE_NONE) {
       changePos(data.symbbox, data.sym, symMoveDir)
     }
 
     // If we didn't back up, add a path segment and mark the new cell as visited
     if (!backedUp) {
       data.path.push(new PathSegment(moveDir))
-      if (data.puzzle.symmetry == null) {
+      if (data.puzzle.symType == SYM_TYPE_NONE) {
         data.puzzle.updateCell2(data.pos.x, data.pos.y, 'line', window.LINE_BLACK)
       } else {
         data.puzzle.updateCell2(data.pos.x, data.pos.y, 'line', window.LINE_BLUE)
@@ -849,7 +885,7 @@ function hardCollision() {
     }
   }
 
-  if (data.puzzle.symmetry != null) {
+  if (data.puzzle.symType != SYM_TYPE_NONE) {
     if (data.sym.x === data.pos.x && data.sym.y === data.pos.y) {
       console.spam('Collided with our symmetrical line')
       gapSize = 13
@@ -885,7 +921,7 @@ function move() {
     } else if (cell.line > window.LINE_NONE && lastDir !== MOVE_RIGHT) {
       console.spam('Collided with other line', cell.line)
       data.x = data.bbox.x1 + 12
-    } else if (data.puzzle.symmetry != null) {
+    } else if (data.puzzle.symType != SYM_TYPE_NONE) {
       var symCell = data.puzzle.getSymmetricalCell(data.pos.x - 1, data.pos.y)
       if (symCell == null || symCell.type !== 'line' || symCell.gap === window.GAP_FULL) {
         console.spam('Collided with symmetrical outside / gap-2', cell)
@@ -903,7 +939,7 @@ function move() {
     } else if (cell.line > window.LINE_NONE && lastDir !== MOVE_LEFT) {
       console.spam('Collided with other line', cell.line)
       data.x = data.bbox.x2 - 12
-    } else if (data.puzzle.symmetry != null) {
+    } else if (data.puzzle.symType != SYM_TYPE_NONE) {
       var symCell = data.puzzle.getSymmetricalCell(data.pos.x + 1, data.pos.y)
       if (symCell == null || symCell.type !== 'line' || symCell.gap === window.GAP_FULL) {
         console.spam('Collided with symmetrical outside / gap-2', cell)
@@ -921,7 +957,7 @@ function move() {
     } else if (cell.line > window.LINE_NONE && lastDir !== MOVE_BOTTOM) {
       console.spam('Collided with other line', cell.line)
       data.y = data.bbox.y1 + 12
-    } else if (data.puzzle.symmetry != null) {
+    } else if (data.puzzle.symType != SYM_TYPE_NONE) {
       var symCell = data.puzzle.getSymmetricalCell(data.pos.x, data.pos.y - 1)
       if (symCell == null || symCell.type !== 'line' || symCell.gap === window.GAP_FULL) {
         console.spam('Collided with symmetrical outside / gap-2', cell)
@@ -939,7 +975,7 @@ function move() {
     } else if (cell.line > window.LINE_NONE && lastDir !== MOVE_TOP) {
       console.spam('Collided with other line', cell.line)
       data.y = data.bbox.y2 - 12
-    } else if (data.puzzle.symmetry != null) {
+    } else if (data.puzzle.symType != SYM_TYPE_NONE) {
       var symCell = data.puzzle.getSymmetricalCell(data.pos.x, data.pos.y + 1)
       if (symCell == null || symCell.type !== 'line' || symCell.gap === window.GAP_FULL) {
         console.spam('Collided with symmetrical outside / gap-2', cell)
@@ -41,7 +41,7 @@ window.validateUserData = function(puzzle, path) {
 
       if (cell.start === true) {
         puzzleHasStart = true
-        if (puzzle.symmetry != null) {
+        if (puzzle.symType != SYM_TYPE_NONE) {
           var symCell = puzzle.getSymmetricalCell(x, y)
           if (symCell == null || symCell.start !== true) {
             throw Error('Startpoint at ' + x + ' ' + y + ' does not have a symmetrical startpoint')
@@ -50,7 +50,7 @@ window.validateUserData = function(puzzle, path) {
       }
       if (cell.end != null) {
         puzzleHasEnd = true
-        if (puzzle.symmetry != null) {
+        if (puzzle.symType != SYM_TYPE_NONE) {
           var symCell = puzzle.getSymmetricalCell(x, y)
           if (symCell == null || symCell.end == null || symCell.end != puzzle.getSymmetricalDir(cell.end)) {
             throw Error('Endpoint at ' + x + ' ' + y + ' does not have a symmetrical endpoint')