From: fred <fred>
Date: Mon, 11 Nov 1996 00:36:50 +0000 (+0000)
Subject: lilypond-0.0.9
X-Git-Tag: release/1.5.59~6844
X-Git-Url: https://git.donarmstrong.com/?a=commitdiff_plain;h=b3dc7b646e090c6a9a74fb6d0fe3e6564f3d3a1b;p=lilypond.git

lilypond-0.0.9
---

diff --git a/hdr/stem.hh b/hdr/stem.hh
new file mode 100644
index 0000000000..6b7bc55d7d
--- /dev/null
+++ b/hdr/stem.hh
@@ -0,0 +1,66 @@
+/*
+  stem.hh -- 
+
+  (c) 1996 Han-Wen Nienhuys
+*/
+
+#ifndef STEM_HH
+#define STEM_HH
+#include "item.hh"
+
+/// the rule attached to the ball
+struct Stem : public Item {
+    // heads the stem encompasses (positions)
+    int minnote, maxnote;
+
+    /// false if in beam
+    bool print_flag;
+    
+    /// needed for determining direction/length
+    int staff_center;
+
+    // extent of the stem (positions)
+    Real bot, top;
+    /**
+      fractional, since Beam has to adapt them.
+      */
+
+    Real stemlen;
+    // flagtype? 4 none, 8 8th flag, 0 = beam.
+    int flag;
+
+    ///geen gedonder, jij gaat onder
+    int dir;
+    /**
+       -1 stem points down, +1: stem points up
+       */
+
+    Real stem_xoffset;
+    /****************/
+
+    /// ensure that this Stem also encompasses the Notehead #n#
+    void add(Notehead*n);
+    Real hpos()const;
+    void set_stemend(Real);
+    void set_default_dir();
+    void set_default_stemlen();
+    void set_default_extents();
+    void postprocess();
+    Stem(int center);
+    void print() const;
+    Interval width() const;
+private:
+
+    void brew_molecole();
+};
+/**
+  takes care of:
+
+  \begin{itemize}
+  \item the rule
+  \item the flag
+  \item up/down position.
+  \end{itemize}
+  */
+
+#endif
diff --git a/src/stem.cc b/src/stem.cc
new file mode 100644
index 0000000000..fdb47f9755
--- /dev/null
+++ b/src/stem.cc
@@ -0,0 +1,156 @@
+#include "stem.hh"
+#include "dimen.hh" 
+#include "debug.hh"
+#include "paper.hh"
+#include "notehead.hh"
+#include "lookup.hh"
+#include "molecule.hh"
+#include "pcol.hh"
+
+const int STEMLEN=7;
+static int
+ABS(int i) {
+    return (i < 0)?-i:i;
+}
+
+
+Stem::Stem(int c)
+{
+    minnote = 1000;		// invalid values
+    maxnote = -1000;
+    bot = top = 0;
+    flag = 4;
+    dir =0;
+    staff_center=c;
+    stemlen=0;
+    print_flag=true;
+    stem_xoffset=0;
+}
+
+
+void
+Stem::set_stemend(Real se)
+{
+    // todo: margins
+    assert((dir > 0 && se >= maxnote) || (se <= minnote && dir <0));
+    
+    top = (dir < 0) ? maxnote           : se;
+    bot = (dir < 0) ? se  : minnote;
+    flag = dir*ABS(flag);
+}
+
+void
+Stem::add(Notehead *n)
+{
+    if (n->balltype == 1)
+	return;
+    int p = n->position;
+    if ( p < minnote)
+	minnote = p;
+    if ( p> maxnote)
+	maxnote = p;
+}
+void
+Stem::print()const
+{
+    mtor << "Stem minmax=["<< minnote<<","<<maxnote<<"], flag: "<<flag;
+    Item::print();
+}
+
+void
+Stem::set_default_dir()
+{
+    Real mean = (minnote+maxnote)/2;
+    dir = (mean > staff_center) ? -1: 1;
+}
+
+void
+Stem::set_default_stemlen()
+{
+    if (!dir)
+	set_default_dir();
+
+    int stafftop = 2*staff_center;
+    stemlen = STEMLEN  + (maxnote - minnote);
+    
+    // uhh... how about non 5-line staffs?	
+    if (maxnote < -2 && dir == 1){
+	int t = staff_center - staff_center/2; 
+	stemlen = t - minnote +2;
+    } else if (minnote > stafftop + 2 && dir == -1) {
+	int t = staff_center + staff_center/2;
+	stemlen = maxnote -t +2;
+    }
+
+    assert(stemlen);
+}
+
+
+void
+Stem::set_default_extents()
+{
+    assert(minnote<=maxnote);
+
+    if (!stemlen)
+	set_default_stemlen();
+
+    set_stemend((dir< 0) ? maxnote-stemlen: minnote +stemlen);
+    if (dir > 0){	
+	stem_xoffset = paper()->note_width();
+    }
+}
+
+void
+Stem::postprocess()
+{
+    set_default_extents();
+    brew_molecole();
+}
+
+Interval
+Stem::width()const
+{
+    if (!print_flag || ABS(flag) <= 4)
+	return Interval(0,0);	// TODO!
+    Paperdef*p= paper();
+    return p->lookup_->flag(flag).dim.x;
+}
+
+void
+Stem::brew_molecole()
+{
+    assert(pstaff_);
+    assert(bot!=top);
+    assert(!output);
+    
+    Paperdef *p =paper();
+    Parametric_symbol *stem = p->lookup_->stem();
+    
+    Real dy = p->interline()/2;
+    String y1 =print_dimen( dy * bot);
+    String y2 = print_dimen(dy * top);
+    Symbol ss =stem->eval(y1,y2);
+    delete stem;
+    
+    output = new Molecule(Atom(ss));
+
+    if (print_flag&&ABS(flag) > 4){
+	Symbol fl = p->lookup_->flag(flag);
+	Molecule m(fl);
+	if (flag < -4){		
+	    output->add_bot(m);
+	} else if (flag > 4) {
+	    output->add_top(m);
+	} else
+	    assert(false); 
+    }
+
+    output->translate(Offset(stem_xoffset,0));
+
+}
+
+Real
+Stem::hpos()const
+{
+    return pcol_->hpos + stem_xoffset;
+}