Draw ledger lines.

It's almost getting to be a usable program now.

diff --git a/score.c b/score.c
index 0c9d5f37cb37e20d9913e0601ef4b66246ccf777..0228b6e2ab3aea5d94f8d2ef5b8e430c63abc98a 100644 (file)
--- a/score.c
+++ b/score.c
@@ -170,6 +170,15 @@ _draw_note (score_t *score, cairo_t *cr,
 {
     double line;
     cairo_glyph_t note_glyph;
+    static double extend_factor = 0.25;
+
+    void _draw_ledger_line (double line, double width) {
+       cairo_move_to (cr,
+                      - width * extend_factor / 2.0,
+                      score->space_height * line + score->line_width / 2.0);
+       cairo_rel_line_to (cr, (1 + extend_factor) * width, 0);
+       cairo_stroke (cr);
+    }
 
     cairo_save (cr);
 
@@ -203,7 +212,22 @@ _draw_note (score_t *score, cairo_t *cr,
     }
 
     note_glyph.x = 0;
-    note_glyph.y = score->space_height * line + score->line_width / 2.0;
+    note_glyph.y = score->space_height * line;
+
+    if (line < 0 || line > 4) {
+       int i;
+       cairo_text_extents_t note_extents;
+
+       cairo_glyph_extents (cr, &note_glyph, 1, &note_extents);
+
+       if (line < 0) {
+           for (i = -1; i >= line; i--)
+               _draw_ledger_line (i, note_extents.width);
+       } else {
+           for (i = 5; i <= line; i++)
+               _draw_ledger_line (i, note_extents.width);
+       }
+    }
 
     cairo_set_source_rgb (cr, 0.0, 0.0, 0.0); /* black */
     cairo_show_glyphs (cr, &note_glyph, 1);