Update of /project/gsharp/cvsroot/gsharp/Doc In directory common-lisp.net:/tmp/cvs-serv24224/Doc

Modified Files: model.tex plans.tex release-notes.tex Log Message: Updates since 0.2 release.

Date: Mon Feb 16 11:08:02 2004 Author: rstrandh

Index: gsharp/Doc/model.tex diff -u gsharp/Doc/model.tex:1.1.1.1 gsharp/Doc/model.tex:1.2 --- gsharp/Doc/model.tex:1.1.1.1 Mon Feb 16 10:46:28 2004 +++ gsharp/Doc/model.tex Mon Feb 16 11:08:01 2004 @@ -45,7 +45,7 @@ corresponding roughly to a \emph{voice} \index{voice} or a \emph{part} \index{part} of the music.

-The difference between a layer and a part ({gs} does not know about +The difference between a layer and a part ({\gs} does not know about parts) is that a layer has a particular \emph{instrument} \index{instrument} assigned to it, whereas a part can have several different instruments, for instance when the same musician plays

Index: gsharp/Doc/plans.tex diff -u gsharp/Doc/plans.tex:1.1.1.1 gsharp/Doc/plans.tex:1.2 --- gsharp/Doc/plans.tex:1.1.1.1 Mon Feb 16 10:46:31 2004 +++ gsharp/Doc/plans.tex Mon Feb 16 11:08:01 2004 @@ -90,8 +90,86 @@ the notes of the element. \end{itemize}

+\subsection{Other minor projects} + +\begin{itemize} +\item multi-buffer, multi-frame +\item display additional information around current element (beaming + information, stem information (auto or not)), etc +\end{itemize} + \section{Major projects}

+\subsection{Improved spacing algorithm} + +There are two aspects of the spacing algorithm: + +\begin{enumerate} +\item Determining how to divide a sequence of measures into pages and + lines based on the amount of space each measure will require on a + given line, +\item Rendering the page(s) actually visible by the user at any given + time. +\end{enumerate} + +We can spend relatively much time on rendering since it is supposedly +only done for a small fraction of the entire score and relatively +little time on dividing sequences of measures into pages and lines. +Also, we can accept a rough estimate of the space that a measure needs +for the purpose of dividing into pages and lines, whereas the +rendering phase needs to be very precise so as to avoid overlapping +characters. + +For rendering, we can assume that we have a bunch of \emph{lines}, +each one being a \emph{sequence of measures}. For this phase, one +idea would be to compute an \emph{elasticity function} for each +measure indicating how willing it is to stretch or compress given that +a certain force is applied to it. In fact it would indicate the width +as a function of force applied. Such a function would be piecewise +linear with rational coordinates to avoid rounding errors. The +elasticity function of a line would be the sum of the elasticity +functions of the measures of the line, again a piecewise linear +function. The combined function would then be solved for the line +length which gives a force to be applied to each measure (elementary +mechanics give that each measure in the sequence would have the same +force applied to it). To render each measure, that force would be +applied to it. + +The problem with dividing a sequence of measures into lines and pages +is that the elasticity function depends on the context. Specifically, +the \emph{natural width} (the width that the measure would take when +given a force of 0) depends on the smallest distance between two +adjacent time lines \emph{of all of the time lines in all of the +measures on a line}. This gets messy, since currently, we depend on +the cost function of a line to be combined in constant time, i.e., the +cost function of a line with a new measure added to the beginning or +to the end of it is possible to compute in constant time from the cost +function of the existing line and that of the new measure. Either I +am being to conservative here, and we can afford to spend more time +computing the cost function of a line, or else, we need to find an +approximation of the elasticity function that will combine in constant +time. This is hard to know until we have tested {\gs} on large +scores, and until we have implemented the page-breaking algorithm (as +opposed to the line-breaking algorithm that we now have). An example +of an approximation of the elasticity function would be to use the +current estimate with an additional value called \emph{additional +constant space}. The cost combination function would add the constant +spaces required by each measure as long as newly added measures have +the same smallest time-line distance (min-dist). As soon as a measure +with smaller min-dist is added to the line, the additional constant +space of the existing line is set to 0. The assumption is that the +existing line is going to have to expand as a result of the smaller +min-dist which will eliminate the need for the additional constant +space. Adding a measure with a larger min-dist than that of the +existing line would simply ignore the additional constant space of +that measure. Again, the assumption is that the new measure will have +to expand so that the additional space will not be needed. + +The additional constant spaced of a measure would be computed as if it +would be inserted into a line having the same min-dist as the measure +itself. Such space would include space for lyrics, accidentals of +complicated clusters, etc. + \subsection{Menu items with arguments}

This is a {\clim} project. Currently {\clim} does not know how to @@ -141,3 +219,41 @@ \item Pages with an arbitrary number of pages, but the number must be of the form $n = ax + b$. \end{itemize} + +\subsection{Other major projects} + +\begin{itemize} +\item presentations everywhere (note heads, clusters, beam groups). +\item context menus on notes, etc +\item allow mouse-based input of new notes by making staff steps + around cursor into presentations. Move pointer to horizontal + location of cursor after interaction. +\item allow mouse-based addition and deletion of notes in existing + clusters by making staff steps around cluster into presentations +\item make sure user can use either keyboard or mouse without changing + too often +\item add new views of score, especially to manipulate staves, + brackets, braces, instruments, etc. +\item perhaps hide interactor by default and use something like M-x to + make it visible. +\item use output recording (hierarchical records) to reorganize pixmaps + and to substitute combined pixmaps. +\end{itemize} + +\section{McCLIM issues and projects} + +\begin{itemize} +\item add better system for Emacs-style commands and key + bindings +\item fix problem of input focus being retained (also a + problem for Goatee) +\item make sure gestures work as announced +\item perhaps make it possible to use something like M-x to change + input focus +\item make setf of frame-layout work +\item multiple top-level frames (as in Franz CLIM). +\item remove compilation warnings in McCLIM +\item remove dead code +\item remove reasons for remarks such as XXX:, FIXME, etc, or at least + put a name in their place +\end{itemize} \ No newline at end of file

Index: gsharp/Doc/release-notes.tex diff -u gsharp/Doc/release-notes.tex:1.1.1.1 gsharp/Doc/release-notes.tex:1.2 --- gsharp/Doc/release-notes.tex:1.1.1.1 Mon Feb 16 10:46:31 2004 +++ gsharp/Doc/release-notes.tex Mon Feb 16 11:08:01 2004 @@ -1,5 +1,34 @@ \chapter{Release notes}

+\section{Release 0.3 (2003-??-??)} + +\subsection{Features added from 0.2} + +\begin{itemize} +\item right edge of staff is no longer hard wired. +\item left margin is now a parameter of the buffer (and on disk). +\item x-position of first measure on line now depends on the size of + the key signature. This means that wide key signatures no longer + overlap with notes of the first measure on the line. +\item Improved MIDI generation making it no longer necessary to pad +measures with empty clusters. +\item Fixed a problem that made {\gs} crash on new versions of + McCLIM (thanks to Andy Hefner for figuring this out). +\item {\gs} can now use asdf instead of mk:defystem (thanks to + Christophe Rhodes). +\item {\gs} now runs on SBCL as well as on CMUCL (thanks to Christophe + Rhodes). +\end{itemize} + +\subsection{Bug fixes from 0.2} + +\begin{itemize} +\item last sharp sign in key signature with seven sharp signs is now + drawn. +\item fixed conformance bugs in some \texttt{loop} constructs (thanks to + Christophe Rhodes). +\end{itemize} + \section{Release 0.2 (2003-09-06)}

\subsection{Features added from 0.1}