Re: [Denemo-devel] Good News

[Richard Shann]

Even nicer, we can display the .png that LilyPond creates (PrintExcerpt)
from within Denemo, the user can select the feature that the LilyPond
directive has caused LilyPond to draw, and this can then become the
graphic that is displayed in Denemo, when that LilyPond directive is
attached.
Magic.
There are some things to do with alpha channels/transparency to sort
out. But this offers a really smooth path for growing Denemo in the
music score generation:
      * You want a new feature, you look up the LilyPond text that does
        it
      * You create a LilyPond directive that inserts that text
      * Give it a command name, menu item etc, but no graphic yet.
      * You run it and check the .png looks right, the feature has
        appeared.
      * You lassoo the feature in the .png view and copy to clipboard
      * You go to the menu item and give it the graphic on the clipboard
Now when you invoke the command it places the graphic in the Denemo
display, at a position that you choose to correspond with where
(typically) LilyPond places it.

About tagging the LilyPond directives with the denemo command that
creates it: I am thinking that it will then be possible to edit the
position graphically, dragging the item thereby modifying the LilyPond
output to accomplish the drag in the final printed version. The drag
could be done in the .png view, it could actually drag a bit of the
image, and the callback for the drag modifies the LilyPond directive to
reposition the item. So when the .png is re-created the item is indeed
moved.
Quite how the dragging invokes the original denemo command in a "move"
rather than "create" mode I will see more clearly as I get closer. (Lots
of possibilities, elegance, simplicity, clarity, ease of use ... will
decide).
Richard


On Thu, 2009-01-29 at 08:54 +0000, Richard Shann wrote:
> I had a bit of time to look at the display code. I can now control the
> space around chords, so for example it will be possible to place guitar
> fingerings adjacent to the note that they refer to. And repeat barlines,
> and more.
> As I mentioned to Nils on #denemo I am thinking of giving what are
> currently LilyPond inserts/attaches a wider remit: many of them have
> implications for the MIDI rendering, and so I think it would be good to
> keep these together. This means that one of these more generalized
> structures can control the display, the print-out and the MIDI
> rendering.
> At the moment, they hold some LilyPond to output and a display string
> which gets printed below the chord. With 0.8.4 they will be able to
> display a graphic (positioned relative to the chord/note, and claiming
> space for it) and - MIDI output permitting - initiate MIDI change (such
> as tempo, volume, others?).
> 
> Richard
> 
> 
> 
> 
> _______________________________________________
> Denemo-devel mailing list
> address@hidden
> http://lists.gnu.org/mailman/listinfo/denemo-devel