Re: Keyboard chord figure in scheme
On Jan 18, 2012, at 9:16 AM, Morten Jagd Christensen wrote: > Now the code works, although there still are som FIXME's. For example the > black keys > are generated by thick lines, but unfortunately they have rounded caps. > > Check out make-connected-path-stencil : the swiss army knife of stencils. A brief API : (make-connected-path-stencil pointlist thickness x-scale y-scale connect fill) Where pointlist is a list of lists. Each list in the list has either 2-points (line) or 6 points (Bezier curve). Since you are just working with lines, you'd use lists of 2. So, if you use (make-connected-path-stencil '((3 0) (3 10) (0 10) (0 0)) 0.1 1 1 #f #t) you'll get a black rectangle of dimensions 3 x 10. With (make-connected-path-stencil '((3 0) (3 10) (0 10) (0 0)) 0.1 1 1 #f #f) you'll get a white rectangle of dimensions 3 x 10. This avoids the rounded caps to which you refer. Cheers, MS ___ lilypond-user mailing list lilypond-user@gnu.org https://lists.gnu.org/mailman/listinfo/lilypond-user
Re: Keyboard chord figure in scheme
Hi Carl Thanks for the hint - I guess it wasn't clear to me when and where ly:stencil-add was needed. Now the code works, although there still are som FIXME's. For example the black keys are generated by thick lines, but unfortunately they have rounded caps. But I have submitted my code to the snippet repository any way, so hopefully others can benefit from your help too. Cheers /Morten On 18/1/12 2:55 AM, Carl Sorensen wrote: On 1/17/12 2:30 PM, "Morten Jagd Christensen" wrote: Hello all I'm trying to make a scheme function that generates a keyboard with black and white dots for showing specific chord layouts The code below compiles and produces the keyboard figure I then call a function (make-dot key) which works fine. What I really want is (make-dot-list '(1 5 8)) which should produce a black dot on c, a white dot on ees and a black dot on g (for a C major chord). I suspect that somehow only the last empty-stencil is returned but have been unable to solve my problem. Does anyone have a suggestion how to solve this? First of all, congratulations on this attempt. It's very good. You are correct. You are only returning the empty stencil. You need the following: #(define (make-dot-list l1) (if (null? l1) empty-stencil (ly:stencil-add (make-dot (car l1) (make-dot-list (cdr l1 This way, you are adding all the stencils. Previously, you were not doing anything with the make-dot stencil. It was getting created, then thrown away. Good luck! Carl ___ lilypond-user mailing list lilypond-user@gnu.org https://lists.gnu.org/mailman/listinfo/lilypond-user
Re: Keyboard chord figure in scheme
On 1/17/12 2:30 PM, "Morten Jagd Christensen" wrote: >Hello all > >I'm trying to make a scheme function that generates a keyboard with >black and white dots for showing specific chord layouts > >The code below compiles and produces the keyboard figure > >I then call a function (make-dot key) which works fine. What I really >want is >(make-dot-list '(1 5 8)) which should produce a black dot on c, a white >dot on ees and a >black dot on g (for a C major chord). > >I suspect that somehow only the last empty-stencil is returned but have >been unable >to solve my problem. > >Does anyone have a suggestion how to solve this? First of all, congratulations on this attempt. It's very good. You are correct. You are only returning the empty stencil. You need the following: #(define (make-dot-list l1) (if (null? l1) empty-stencil (ly:stencil-add (make-dot (car l1) (make-dot-list (cdr l1 This way, you are adding all the stencils. Previously, you were not doing anything with the make-dot stencil. It was getting created, then thrown away. Good luck! Carl ___ lilypond-user mailing list lilypond-user@gnu.org https://lists.gnu.org/mailman/listinfo/lilypond-user
