-
-The original code draws every grid point on screen, even the ones that are
-off the board. When the user zooms out with a dense grid, it can become too
-dense - the original code turns the grid off in this case.
-
-If the grid is very dense, on a large screen the software render may slow down.
-This is noticeable in pan and zoom mostly. The bottleneck is the gtk call
-that draws the grid points: if there are too many of them, it's slow.
-
-
-
New grid
-
-To overcome this problem, pcb-rnd offers configuration settings to limit
-the number of dots to be drawn. There are mainly two parallel approaches:
-using a local grid or draw less dots in a global grid. The
-old code defined only a global grid and did not have runtime settings for
-the properties of the grid.
-
-There's a new "Grid properties" submenu in the view menu in the default
-gtk hid menu file. Screenshots were taken with this menu teared-down to
-demonstrate the settings.
-
-
Global grid improvements
-
-The most trivial optimization is that grid points off the board are simply
-not drawn:
-
-
-
-Next, the compile-time configurable "minimum distance between grid points
-before it is too dense" setting is user configurable now. The default value
-can be changed in any of the usual
-configuration sources. However,
-when the configured density is reached while zooming out, there are two options.
-
-The first, default option is to do the same that the original code did: just
-hide the grid:
-
-
-
-An alternative is to use sparse global grid which means only
-every 2nd, 3rd, 4th, ... Nth grid point is drawn. The cursor still snaps
-to every real grid point, so the grid got sparse only on the display. Note
-how the line is drawn on invisible grid points:
-
-
-
-
Introduction of the local grid
-Another approach is to use a local grid. The grid helps finding whether
-existing objects are aligned or where the next move/click would end up.
-These are usually interesting only in a small range around the crosshair and
-less interesting on the other end of the board. Local grid draws the grid
-points only near the crosshair. Such local grid follows the crosshair
-everywhere:
-
-
-
-The user can configure or interactively set the radius in which the grid
-points are drawn:
-
-
-
-The radius is given in "number of grid points", thus the local grid yields
-a constant number of points that is independent of the actual grid size. When
-a local grid gets too dense, it is hidden - there's no sparse option, since
-local grids usually have too few points to make reasonable skips.
-
-
save/load and compatibility
-Not affected.
-
-
plans
-This feature is gtk-specific and is complete. There are no plans to
-implement this in the lesstif HID at the moment.
-
-
-
Index: trunk/doc/features/grid_edge.png
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--- trunk/doc/features/index.html (revision 13640)
+++ trunk/doc/features/index.html (revision 13641)
@@ -45,7 +45,6 @@
![[pcb-rnd logo]](../resources/logo32.png){kind=logo}
-![[screenshot showing of grid]](grid_edge.png)
-![[screenshot with grid option menu]](grid_global_nosparse.png)
-![[screenshot with grid option menu]](grid_global_sparse.png)
-
-![[screenshot with grid option menu]](grid_local_4.png)
-![[screenshot with grid option menu]](grid_local_16.png)
-