More work on tempo map

Region.C

@@ -331,7 +331,7 @@ Region::draw ( int X, int Y, int W, int H )
 
     int rx = x();
 
-    printf( "rx %d, rw %d\n", rx, rw );
+//    printf( "rx %d, rw %d\n", rx, rw );
 
     fl_push_clip( rx, Y, rw, H );
 

Timeline.H

@@ -30,7 +30,41 @@
 
 #include <FL/fl_draw.H>
 
+#include <list>
+using std::list;
+
+class timestamped
+{
+public:
+
+    nframes_t timestamp;
+
+    bool
+    operator< ( const timestamped &rhs ) const { return timestamp < rhs.timestamp; }
+};
+
 struct Timeline {
+
+    struct tempo_event : timestamped
+    {
+        float beats_per_minute;
+    };
+
+    struct signature_event : timestamped
+    {
+        int beats_per_bar;
+        int beat_type;
+    };
+
+    enum snap_flags_e {
+        SNAP_TO_REGION,
+        SNAP_TO_BAR,
+        SNAP_TO_BEAT
+    } snap_to;
+
+    list <tempo_event> tempo_points;
+    list <signature_event> signature_points;
+
     Fl_Scroll *scroll;
     Fl_Pack *tracks;
     Fl_Scrollbar *scrollbar;
@@ -66,6 +100,42 @@ struct Timeline {
             return _beats_per_minute;
         }
 
+
+    float
+    beats_per_minute ( nframes_t when ) const
+        {
+            for ( list <tempo_event>::const_reverse_iterator i = tempo_points.rbegin();
+                  i != tempo_points.rend(); i++ )
+            {
+                if ( i->timestamp < when )
+                    return i->beats_per_minute;
+            }
+
+            return _beats_per_minute;
+        }
+
+    void
+    beats_per_minute ( nframes_t when, float bpm )
+        {
+            tempo_event t;
+
+            t.timestamp = when;
+            t.beats_per_minute = bpm;
+
+            tempo_points.push_back( t );
+        }
+
+/*     /\* return the offset of the closest measure line to /t/ *\/ */
+/*     nframes_t */
+/*     snap ( nframes t ) */
+/*         { */
+
+
+
+
+
+/*         } */
+
     /* draw appropriate measure lines inside the given bounding box */
     void
     draw_measure_lines ( int X, int Y, int W, int H, Fl_Color color )
@@ -73,13 +143,17 @@ struct Timeline {
             fl_line_style( FL_DASH, 2 );
             fl_color( fl_color_average( FL_BLACK, color, 0.65f ) );
 
-            int measure = ts_to_x( sample_rate * 60 / beats_per_minute() );
+//            int measure = ts_to_x( sample_rate * 60 / beats_per_minute() );
+
+            int measure;
 
             for ( int x = X; x < X + W; ++x )
-
+            {
+                measure = ts_to_x( (double)(sample_rate * 60) / beats_per_minute( x_to_ts( x ) + xoffset ));
                 if ( 0 == (ts_to_x( xoffset ) + x) % measure )
                     fl_line( x, Y, x, Y + H );
 
+            }
             fl_line_style( FL_SOLID, 0 );
         }
 };

main.C

@@ -115,6 +115,12 @@ main ( int argc, char **argv )
     timeline.fpp = 256;
     timeline._beats_per_minute = 120;
 
+
+    timeline.beats_per_minute( 0, 120 );
+    timeline.beats_per_minute( 48000, 250 );
+    timeline.beats_per_minute( 48000 * 4, 60 );
+
+
     timeline.sample_rate = 44100;
 
     timeline.tracks = new Fl_Pack( 0, 0, 800, 5000 );