Add peak hold to VU meter widget.

Mixer_Strip.fl

@@ -2,7 +2,8 @@
 version 1.0108 
 header_name {.H} 
 code_name {.C}
-decl {\#include "VU_Meter.H"} {} 
+decl {\#include "VU_Meter.H"} {selected public global
+} 
 
 widget_class Mixer_Strip {open
   xywh {1051 42 124 816} type Double box UP_FRAME color 32 selection_color 63 resizable
@@ -21,7 +22,7 @@ widget_class Mixer_Strip {open
   } {
     Fl_Button {} {
       label {@circle}
-      private xywh {7 143 35 25} type Toggle
+      private xywh {7 143 35 25} type Toggle labelsize 10
     }
     Fl_Button {} {
       label m
@@ -35,13 +36,13 @@ widget_class Mixer_Strip {open
   Fl_Group {} {open
     xywh {13 178 104 509} resizable
   } {
-    Fl_Value_Slider {} {
+    Fl_Value_Slider gain {
       label Gain
       callback {// parent()->parent()->damage( FL_DAMAGE_ALL, x(), y(), w(), h() );}
       xywh {14 195 33 471} type {Vert Knob} color 32 selection_color 1 minimum 1.5 maximum 0 step 0.01 value 1 textsize 14
     }
-    Fl_Box {} {
+    Fl_Box meter {
-      label VU selected
+      label VU
       xywh {57 193 55 484} box ROUNDED_BOX selection_color 88
       class VU_Meter
     }

VU_Meter.C

@@ -31,6 +31,8 @@ VU_Meter::VU_Meter ( int X, int Y, int W, int H, const char *L ) :
     Fl_Widget( X, Y, W, H, L )
 {
 
+    _peak = 0.0f;
+
     divisions( 32 );
     type( FL_VERTICAL );
 
@@ -53,6 +55,7 @@ VU_Meter::draw ( void )
 //    draw_box( FL_FLAT_BOX, x(), y(), w(), h(), color() );
 
     int v = (value() / maximum()) * _divisions;
+    int pv = (_peak / maximum()) * _divisions;
 
     int bh = h() / _divisions;
     int bw = w() / _divisions;
@@ -61,7 +64,7 @@ VU_Meter::draw ( void )
     {
         Fl_Color c = fl_color_average( _max_color, _min_color, (float)p / _divisions );
 
-        if ( p > v )
+        if ( p > v && p != pv )
 //            c = fl_color_average( color(), c, _dim );
             c = fl_color_average( FL_BLACK, c, _dim );
 
@@ -72,6 +75,22 @@ VU_Meter::draw ( void )
             draw_box( box(), x() + (p * bw), y(), bw, h(), c );
         else
             draw_box( box(), x(), y() + h() - (p * bh), w(), bh, c );
-
     }
+
+    if ( value() > _peak )
+        _peak = value();
+}
+
+
+int
+VU_Meter::handle ( int m )
+{
+    switch ( m )
+    {
+        case FL_PUSH:
+            reset();
+            break;
+    }
+
+    return 0;
 }

VU_Meter.H

@@ -24,6 +24,8 @@
 class VU_Meter : public Fl_Widget
 {
 
+    float _peak;
+
     float _value;
     float _minimum;
     float _maximum;
@@ -38,12 +40,12 @@ class VU_Meter : public Fl_Widget
 protected:
 
     virtual void draw ( void );
+    virtual int handle ( int m );
 
 public:
 
     VU_Meter ( int X, int Y, int W, int H,  const char *L = 0 );
 
-
     void maximum( float v ) { _maximum = v; redraw(); }
     float maximum ( void ) const { return _maximum; }
 
@@ -53,6 +55,8 @@ public:
     void value ( float v ) { _value = v; redraw(); }
     float value ( void ) const { return _value; }
 
+    void reset ( void ) { _peak = 0.0f; }
+
     bool divisions ( void ) const { return _divisions; }
     void divisions ( int v ) { _divisions = v; }