2 files changed, 11 insertions, 2 deletions
diff --git a/app/assets/javascripts/wittle/trace2.js b/app/assets/javascripts/wittle/trace2.js
index e36e4bd..81439e7 100644
--- a/app/assets/javascripts/wittle/trace2.js
+++ b/app/assets/javascripts/wittle/trace2.js

@@ -696,7 +696,11 @@ window.onMove = function(dx, dy) {
      data.path.pop().destroy()
      data.puzzle.updateCell2(data.pos.x, data.pos.y, 'line', window.LINE_NONE)
      if (data.puzzle.symType != SYM_TYPE_NONE) {
-        data.puzzle.updateCell2(data.sym.x, data.sym.y, 'line', window.LINE_NONE)
+        if (data.puzzle.getLine(data.sym.x, data.sym.y) == window.LINE_OVERLAP) {
+          data.puzzle.updateCell2(data.sym.x, data.sym.y, 'line', window.LINE_BLUE)
+        } else {
+          data.puzzle.updateCell2(data.sym.x, data.sym.y, 'line', window.LINE_NONE)
+        }
      }
    }
@@ -713,7 +717,11 @@ window.onMove = function(dx, dy) {
        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)
-        data.puzzle.updateCell2(data.sym.x, data.sym.y, 'line', window.LINE_YELLOW)
+        if (data.puzzle.getLine(data.sym.x, data.sym.y) == window.LINE_BLUE) {
+          data.puzzle.updateCell2(data.sym.x, data.sym.y, 'line', window.LINE_OVERLAP)
+        } else {
+          data.puzzle.updateCell2(data.sym.x, data.sym.y, 'line', window.LINE_YELLOW)
+        }
      }
    }
  }
diff --git a/app/assets/javascripts/wittle/utilities.js.erb b/app/assets/javascripts/wittle/utilities.js.erb
index 6bf3a17..b621003 100644
--- a/app/assets/javascripts/wittle/utilities.js.erb
+++ b/app/assets/javascripts/wittle/utilities.js.erb

@@ -129,6 +129,7 @@ window.LINE_NONE     = 0
 window.LINE_BLACK    = 1
 window.LINE_BLUE     = 2
 window.LINE_YELLOW   = 3
+window.LINE_OVERLAP  = 4
 window.DOT_NONE      = 0
 window.DOT_BLACK     = 1
 window.DOT_BLUE      = 2