Timeline: Fix region/fade drawing at tight zoom levels.

Closes #164

timeline/src/Audio_Region.C

@@ -405,7 +405,7 @@ Audio_Region::draw_fade ( const Fade &fade, Fade::fade_dir_e dir, bool line, int
                                                 
     if ( dir == Fade::In )
     {
-        fx = line_x();
+        fx = curve_x();
      
         if ( fx + width < X ||
                           fx > X + W )
@@ -414,7 +414,7 @@ Audio_Region::draw_fade ( const Fade &fade, Fade::fade_dir_e dir, bool line, int
     }
     else
     {
-        fx = line_x() + abs_w();
+        fx = curve_x() + abs_w();
 
         if ( fx - width > X + W || 
              fx < X )
@@ -431,8 +431,8 @@ Audio_Region::draw_fade ( const Fade &fade, Fade::fade_dir_e dir, bool line, int
     fl_vertex( fx, dy + height );
 
     {
-        const float ti = 1.0f / (float)width;
-        float ts = 0.0f;
+        const double ti = 1.0 / (double)width;
+        double ts = 0.0;
         
         const int xi = dir == Fade::In ? 1 : -1;
 
@@ -487,8 +487,7 @@ Audio_Region::draw_box( void )
         b = FL_DOWN_FRAME;
     }
 
-    fl_draw_box( b, line_x(), y(), abs_w(), h(), c );
- 
+    fl_draw_box( b, x(), y(), w(), h(), c );
 
 //    fl_pop_clip();
 }

timeline/src/Control_Point.H

@@ -57,7 +57,7 @@ public:
     /* only for playback thread */
     nframes_t when ( void ) const { return _range.start; }
 
-    int abs_w ( void ) const { return 8; }
+    long abs_w ( void ) const { return 8; }
 
     int y ( void ) const { return parent()->y() + ((float)parent()->h() * _y); }
     int h ( void ) const { return 8; }

timeline/src/Sequence_Point.H

@@ -41,7 +41,7 @@ protected:
 public:
 
     Fl_Align align ( void ) const { return FL_ALIGN_RIGHT; }
-    virtual int abs_w ( void ) const { return 8; }
+    virtual long abs_w ( void ) const { return 8; }
 
 //    virtual int abs_x ( void ) const { return Sequence_Widget::abs_x() - ( abs_w() >> 1 ); }
 //    virtual int x ( void ) const { return Sequence_Widget::line_x() - ( abs_w() >> 1 ); }

timeline/src/Sequence_Region.C

@@ -239,7 +239,7 @@ Sequence_Region::draw_box ( void )
 {
     Fl_Color c = selected() ? selection_color() : box_color();
 
-    fl_draw_box( box(), line_x(), y(), abs_w(), h(), fl_color_add_alpha( c, 127 ) );
+    fl_draw_box( box(), x(), y(), w(), h(), fl_color_add_alpha( c, 127 ) );
 }
 
 void

timeline/src/Sequence_Widget.H

@@ -189,8 +189,9 @@ public:
     int get_x( nframes_t frame ) const
         {
             return  frame < timeline->xoffset ?
-                _sequence->drawable_x() : 
-                min( _sequence->drawable_x() + _sequence->drawable_w(), _sequence->drawable_x() + timeline->ts_to_x( frame - timeline->xoffset ) );
+                _sequence->drawable_x() - 10 : 
+                min( _sequence->drawable_x() + _sequence->drawable_w(),
+                     _sequence->drawable_x() + timeline->ts_to_x( frame - timeline->xoffset ) );
         }
 
     virtual int x ( void ) const
@@ -198,19 +199,27 @@ public:
             return get_x( _r->start );
         }
 
-    /* use this as x() when you need to draw lines between widgets */
+    /* use this as x() when you need to draw lines between widgets. Clamped to -32767-32767 to match max canvas size of FLTK/NTK  */
     int line_x ( void ) const
         {
             return _r->start < timeline->xoffset ? 
                 max( -32767, _sequence->drawable_x() - timeline->ts_to_x( timeline->xoffset - _r->start )) :
-                min( 32767, _sequence->drawable_x() + timeline->ts_to_x( _r->start - timeline->xoffset ) );
+                min( 32767, _sequence->drawable_x() + timeline->ts_to_x( _r->start - timeline->xoffset  ));
+        }
+
+    /* same as above but un-clamped for cairo */
+    long curve_x ( void ) const
+        {
+            return _r->start < timeline->xoffset ? 
+                _sequence->drawable_x() - timeline->ts_to_x( timeline->xoffset - _r->start ) :
+                _sequence->drawable_x() + timeline->ts_to_x( _r->start - timeline->xoffset  );
         }
 
     virtual int w ( void ) const
         {
 //            int tx = timeline->ts_to_x( _r->start );
 
-            int rw;
+            long rw;
 
             if ( _r->start < timeline->xoffset )
             {
@@ -222,11 +231,11 @@ public:
             else
                 rw = abs_w();
 
-            return min( rw, _sequence->drawable_w() );
+            return (int)min( rw, (long)(_sequence->drawable_w() + 20)  );
         }
 
     int abs_x ( void ) const { return timeline->ts_to_x( _r->start ); }
-    virtual int abs_w ( void ) const { return timeline->ts_to_x( _r->length ); }
+    virtual long abs_w ( void ) const { return timeline->ts_to_x( _r->length ); }
 
     Fl_Color color ( void ) const { return _color; }
     void color ( Fl_Color v ) { _color = v; }