On Sun, Jul 27, 2008 at 3:57 PM, Ryan May <[EMAIL PROTECTED]> wrote:
> Hi,
>
> Can anyone explain how the clipping code works? Or maybe how the backends
> decide whether to draw a line? In working on drawing skewT's, I need
> slanted gridlines. Through proper setting of transforms, I can get them to
> draw slanted fine, but because they are slanted, the data x range at the top
> of the plot is not equal to the data x range at the bottom.
The clipping code works as you would expect -- you pass it a path and
the artist is clipped to that path. I think you are being bitten by
something else (see below)
> One issue that crops up as a result (which I've mentioned before) is that
> the tickmarks at the top get drawn off past the right end of the plot
> (enabling clipping of ticklines fixes this).
Yes, you probably want to clip them
> The second issue, which is the focus here, is that it seems impossible to
> get matplotlib to draw any gridlines that start before the left side of the
> chart. I can tweak Axis.draw() and get it to draw *all* the currently set
> tick marks and I can disable clipping so that the gridlines draw past the
> *right* side of the plot, but I can't seem to figure out how to draw a grid
> lines that starts from off the left side.
Look in the axis at the method:
def draw(self, renderer):
if not self.get_visible(): return
renderer.open_group(self.__name__)
midPoint =
mtransforms.interval_contains(self.get_view_interval(),
self.get_loc())
if midPoint:
if self.gridOn:
self.gridline.draw(renderer)
if self.tick1On:
self.tick1line.draw(renderer)
if self.tick2On:
self.tick2line.draw(renderer)
The is midPoint is causing your troubles. Replace that with 'if 1 or
midPoint' and your grids magically appear. You may want to insert
some logic here so that custom classes can override this behavior.
You mentioned you were using GTK -- clipping is not properly supported
using the gdk renderer, so make sure you are using GTKAgg (or some
other Agg variant) for your UI while testing clipping.
JDH
-------------------------------------------------------------------------
This SF.Net email is sponsored by the Moblin Your Move Developer's challenge
Build the coolest Linux based applications with Moblin SDK & win great prizes
Grand prize is a trip for two to an Open Source event anywhere in the world
http://moblin-contest.org/redirect.php?banner_id=100&url=/
_______________________________________________
Matplotlib-devel mailing list
Matplotlib-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/matplotlib-devel
