support ggplot2 about playwith

[GoogleCodeExporter]

ok, re-organised things so it detects ggplot based on the class of the result 
of the
plot call.

current problem is that I need to print(object, pretty=FALSE) because of a bug 
in
`grid` package.

Original comment by foolish.android on 4 Feb 2008 at 8:12

• Changed state: Started

[GoogleCodeExporter]

should work ok with qplot()-based constructions,
not with ggplot().

Original comment by foolish.android on 17 Jun 2008 at 2:21

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• Removed labels: Priority-High

[GoogleCodeExporter]

Original comment by foolish.android on 3 Sep 2008 at 8:28

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• Removed labels: Priority-Medium