Pango/cairo and symbol fonts
on 06/30/2008 05:26 PM Roger Bivand wrote:
On Mon, 30 Jun 2008, Peter Dalgaard wrote:
Marc Schwartz wrote:
on 06/30/2008 04:26 AM Roger Bivand wrote:
Excuse my asking here than on R-help, but it may be a Fedora question. On Fedora 7, I'm running a fresh R 2.7.1 built from source, usually in en_GB, but also tried in en_GB.UTF8. Running example(plotmath) generates lots of: Pango-WARNING **: shape engine failure, expect ugly output. the offending font is 'Symbol Not-Rotated ...' Setting: x11(type="Xlib") relieves the problem, but I'd like to use cairo if possible. I have both urw-fonts and liberation-fonts installed. I'm pretty sure it is my F7, not R, and would be grateful for any advice. It's the same story with the png device. Roger
Roger, Check capabilities() to be sure that 'cairo' shows as TRUE. If it shows FALSE, be sure to install the cairo and cairo-devel RPMs and re-build R so that cairo support is available. You may just need the 'cairo-devel' RPM if the 'cairo' RPM is already present. Also, as an aside, F7 went EOL on June 13. If that is not helpful, post back.
I suspect that is isn't helpful. If cairo is not there, you'd just get Xlib and no warnings (and no features either). So my suspicion is that something needs to be upgraded beyond the F7 level, which could get a little sticky.
Right, cairo is TRUE, so it is most likely a fonts issue. I'm mostly RHEL 4/5, but also F7, and looked at F9 to upgrade, but have a production project on F7. This means that upgrading is not an option in the short term, while working cairo with a symbols font would be desirable. For the time being I can hold on old PDF/PNG if there is no known alternative.
Roger, based upon ?x11, try setting the following environment variable: Sys.setenv(FC_DEBUG=1) which may provide some tracing/insight into the font selection process when running code and perhaps offer some indications as to what font is being looked for and not found. HTH, Marc