Serious Problem with GridLines

*To*: mathgroup at smc.vnet.net*Subject*: [mg79704] Serious Problem with GridLines*From*: "David Park" <djmpark at comcast.net>*Date*: Thu, 2 Aug 2007 03:50:48 -0400 (EDT)

Pre-Version 6 Mathematica had an obscure option AxesFront that was buried in the Graphics`FilledPlot` package. This option, when set to True, would ensure that both the axes and any GRID LINES were always in front of any other graphics. I always thought that they should make AxesFront a general Graphics option. What WRI did instead, in Version 6, is automatically ensure that axes (along with their ticks and labels) are always in front and they let GridLines take the hindmost. There is no longer any (simple) way to force grid lines to be in front. In the documentation they state: "In some plots, grid lines can be completely occluded by the image. Mesh can be used instead, to place the lines above the graphic." But this will only work for plots like DensityPlot. Generally, Mesh is no substitute at all for GridLines. Consider the following plot: ListLogPlot[Table[PartitionsQ[n], {n, 50}], Filling -> Bottom, FillingStyle -> Lighter@Orange, Joined -> True, Frame -> True, Mesh -> True, GridLines -> Automatic, GridLinesStyle -> LightGray] Using Mesh only puts dots along the curve. We could obtain a partial solution by using Opacity on the filling along with darker grid lines: ListLogPlot[Table[PartitionsQ[n], {n, 50}], Filling -> Bottom, FillingStyle -> Opacity[0.6, Lighter@Orange], Joined -> True, Frame -> True, GridLines -> Automatic, GridLinesStyle -> Gray] but I prefer to keep the grid lines quite faint. If we are to lose the choice then it would be much better if GridLines were treated the same as Axes and were always automatically in front. -- David Park djmpark at comcast.net http://home.comcast.net/~djmpark/