Re: [Plplot-devel] Background colour handling for extcairo is currently missing
Alan W. Irwin wrote: On 2009-10-25 14:13-0700 Alan W. Irwin wrote: On 2009-10-25 15:11-0500 Hezekiah M. Carty wrote: It is my understanding that automatically clearing the page to the background color is intentionally left out of the extcairo device intentionally so that the provided context is preserved. This way a user can provide, for example, an image they want to plot over and it will be preserved. I use this feature of the driver quite often, so I would prefer that the extcairo functionality remain as-is, at least in the default case. There are two issues here. (1) Should we allow specifying a possibly transparent background colour for extcairo similar to every other device driver? (2) If the answer to (1) is yes, should that default background be transparent? I would argue pretty strongly for (1) simply because most/all of our devices have background colour setting capability, and I assume some extcairo users will want this as well (e.g., for our ext-cairo-test case). I think the answer to (2) should depend on what the majority of users are doing with extcairo. I don't have a clue about that usage, but if you think the majority will be using background images instead of solid backgrounds, then I would be willing to go along with making the background transparent by default for the extcairo case simply as a matter of convenience for that majority use case. With regards to implementing this, I just realized that it should be easier to implement background colour processing as a driver option for extcairo then something more complicated that I had in mind before with transparent background colours. So (1) and (2) should be changed to (1) Should we implement background colour processing as a driver option for extcairo? (2) if so, should the default driver option be to have that background or not for extcairo? I think (1) is a no-brainer. On (2) I would be happy to go along with your instincts about what default would be the most convenient for typical background (PLplot or image?) usage by all users. Done. The option is set_background=0|1. The default is no background. -Hazen -- Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july ___ Plplot-devel mailing list Plplot-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/plplot-devel
[Plplot-devel] Background colour handling for extcairo is currently missing
Hi Hazen: If you look at the results from ext-cairo-test, the current background is white. I followed up that issue, and our default cmap0 file is being read correctly which includes a black background. However, that black PLplot background is currently being ignored (and I presume we are getting a default white background from the cairo libraries instead) because there is no handling of background colour for the extcairo device in cairo.c. Would you be willing to add background colour handling to extcairo like you do for all other cairo devices? Alan __ Alan W. Irwin Astronomical research affiliation with Department of Physics and Astronomy, University of Victoria (astrowww.phys.uvic.ca). Programming affiliations with the FreeEOS equation-of-state implementation for stellar interiors (freeeos.sf.net); PLplot scientific plotting software package (plplot.org); the libLASi project (unifont.org/lasi); the Loads of Linux Links project (loll.sf.net); and the Linux Brochure Project (lbproject.sf.net). __ Linux-powered Science __ -- Come build with us! The BlackBerry(R) Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9 - 12, 2009. Register now! http://p.sf.net/sfu/devconference ___ Plplot-devel mailing list Plplot-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/plplot-devel
Re: [Plplot-devel] Background colour handling for extcairo is currently missing
On 2009-10-25 15:11-0500 Hezekiah M. Carty wrote: On Sun, Oct 25, 2009 at 12:34 PM, Alan W. Irwin ir...@beluga.phys.uvic.ca wrote: Hi Hazen: If you look at the results from ext-cairo-test, the current background is white. I followed up that issue, and our default cmap0 file is being read correctly which includes a black background. However, that black PLplot background is currently being ignored (and I presume we are getting a default white background from the cairo libraries instead) because there is no handling of background colour for the extcairo device in cairo.c. Would you be willing to add background colour handling to extcairo like you do for all other cairo devices? It is my understanding that automatically clearing the page to the background color is intentionally left out of the extcairo device intentionally so that the provided context is preserved. This way a user can provide, for example, an image they want to plot over and it will be preserved. I use this feature of the driver quite often, so I would prefer that the extcairo functionality remain as-is, at least in the default case. There are two issues here. (1) Should we allow specifying a possibly transparent background colour for extcairo similar to every other device driver? (2) If the answer to (1) is yes, should that default background be transparent? I would argue pretty strongly for (1) simply because most/all of our devices have background colour setting capability, and I assume some extcairo users will want this as well (e.g., for our ext-cairo-test case). I think the answer to (2) should depend on what the majority of users are doing with extcairo. I don't have a clue about that usage, but if you think the majority will be using background images instead of solid backgrounds, then I would be willing to go along with making the background transparent by default for the extcairo case simply as a matter of convenience for that majority use case. Alan __ Alan W. Irwin Astronomical research affiliation with Department of Physics and Astronomy, University of Victoria (astrowww.phys.uvic.ca). Programming affiliations with the FreeEOS equation-of-state implementation for stellar interiors (freeeos.sf.net); PLplot scientific plotting software package (plplot.org); the libLASi project (unifont.org/lasi); the Loads of Linux Links project (loll.sf.net); and the Linux Brochure Project (lbproject.sf.net). __ Linux-powered Science __ -- Come build with us! The BlackBerry(R) Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9 - 12, 2009. Register now! http://p.sf.net/sfu/devconference ___ Plplot-devel mailing list Plplot-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/plplot-devel
Re: [Plplot-devel] Background colour handling for extcairo is currently missing
On Sun, Oct 25, 2009 at 12:34 PM, Alan W. Irwin ir...@beluga.phys.uvic.ca wrote: Hi Hazen: If you look at the results from ext-cairo-test, the current background is white. I followed up that issue, and our default cmap0 file is being read correctly which includes a black background. However, that black PLplot background is currently being ignored (and I presume we are getting a default white background from the cairo libraries instead) because there is no handling of background colour for the extcairo device in cairo.c. Would you be willing to add background colour handling to extcairo like you do for all other cairo devices? It is my understanding that automatically clearing the page to the background color is intentionally left out of the extcairo device intentionally so that the provided context is preserved. This way a user can provide, for example, an image they want to plot over and it will be preserved. I use this feature of the driver quite often, so I would prefer that the extcairo functionality remain as-is, at least in the default case. Hez -- Hezekiah M. Carty Graduate Research Assistant University of Maryland Department of Atmospheric and Oceanic Science -- Come build with us! The BlackBerry(R) Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9 - 12, 2009. Register now! http://p.sf.net/sfu/devconference ___ Plplot-devel mailing list Plplot-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/plplot-devel
Re: [Plplot-devel] Background colour handling for extcairo is currently missing
On 2009-10-25 14:13-0700 Alan W. Irwin wrote: On 2009-10-25 15:11-0500 Hezekiah M. Carty wrote: It is my understanding that automatically clearing the page to the background color is intentionally left out of the extcairo device intentionally so that the provided context is preserved. This way a user can provide, for example, an image they want to plot over and it will be preserved. I use this feature of the driver quite often, so I would prefer that the extcairo functionality remain as-is, at least in the default case. There are two issues here. (1) Should we allow specifying a possibly transparent background colour for extcairo similar to every other device driver? (2) If the answer to (1) is yes, should that default background be transparent? I would argue pretty strongly for (1) simply because most/all of our devices have background colour setting capability, and I assume some extcairo users will want this as well (e.g., for our ext-cairo-test case). I think the answer to (2) should depend on what the majority of users are doing with extcairo. I don't have a clue about that usage, but if you think the majority will be using background images instead of solid backgrounds, then I would be willing to go along with making the background transparent by default for the extcairo case simply as a matter of convenience for that majority use case. With regards to implementing this, I just realized that it should be easier to implement background colour processing as a driver option for extcairo then something more complicated that I had in mind before with transparent background colours. So (1) and (2) should be changed to (1) Should we implement background colour processing as a driver option for extcairo? (2) if so, should the default driver option be to have that background or not for extcairo? I think (1) is a no-brainer. On (2) I would be happy to go along with your instincts about what default would be the most convenient for typical background (PLplot or image?) usage by all users. Alan __ Alan W. Irwin Astronomical research affiliation with Department of Physics and Astronomy, University of Victoria (astrowww.phys.uvic.ca). Programming affiliations with the FreeEOS equation-of-state implementation for stellar interiors (freeeos.sf.net); PLplot scientific plotting software package (plplot.org); the libLASi project (unifont.org/lasi); the Loads of Linux Links project (loll.sf.net); and the Linux Brochure Project (lbproject.sf.net). __ Linux-powered Science __ -- Come build with us! The BlackBerry(R) Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9 - 12, 2009. Register now! http://p.sf.net/sfu/devconference ___ Plplot-devel mailing list Plplot-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/plplot-devel
