Don't always draw waveforms inverted!

Timeline/Waveform.C

@@ -83,8 +83,8 @@ Waveform::draw ( int X, int Y, int W, int H,
                 else
                     fl_color( color );
 
-            const int ty = mid + ( halfheight * p.min );
-            const int by = mid + ( halfheight * p.max );
+            const int ty = mid - ( halfheight * p.min );
+            const int by = mid - ( halfheight * p.max );
             fl_line( x, ty, x, by );
 
 /*             if ( outline ) */
@@ -112,7 +112,7 @@ Waveform::draw ( int X, int Y, int W, int H,
         j = start;
 
         for ( int x = X; x < X + W; ++x, j += skip )
-            fl_vertex( x, ty + ( halfheight * pbuf[ j ].min ) );
+            fl_vertex( x, ty - ( halfheight * pbuf[ j ].min ) );
 
         fl_end_line();
 
@@ -121,7 +121,7 @@ Waveform::draw ( int X, int Y, int W, int H,
         j = start;
 
         for ( int x = X; x < X + W; ++x, j += skip )
-            fl_vertex( x, ty + ( halfheight * pbuf[ j ].max ) );
+            fl_vertex( x, ty - ( halfheight * pbuf[ j ].max ) );
 
         fl_end_line();