Add a VU_Meter widget.

VU_Meter.C

@@ -0,0 +1,83 @@
+
+/*******************************************************************************/
+/* Copyright (C) 2008 Jonathan Moore Liles                                     */
+/*                                                                             */
+/* This program is free software; you can redistribute it and/or modify it     */
+/* under the terms of the GNU General Public License as published by the       */
+/* Free Software Foundation; either version 2 of the License, or (at your      */
+/* option) any later version.                                                  */
+/*                                                                             */
+/* This program is distributed in the hope that it will be useful, but WITHOUT */
+/* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or       */
+/* FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for   */
+/* more details.                                                               */
+/*                                                                             */
+/* You should have received a copy of the GNU General Public License along     */
+/* with This program; see the file COPYING.  If not,write to the Free Software */
+/* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+/*******************************************************************************/
+
+/* a VU meter, either horizontal or vertical.  Color is a gradient
+   from color() to selection_color(). box() is used to draw the
+   individual 'lights'. division() controls how many 'lights' there
+   are. */
+
+#include "VU_Meter.H"
+
+#include <FL/Fl.H>
+#include <FL/fl_draw.H>
+
+VU_Meter::VU_Meter ( int X, int Y, int W, int H, const char *L ) :
+    Fl_Widget( X, Y, W, H, L )
+{
+
+    divisions( 32 );
+    type( FL_VERTICAL );
+
+    dim( 0.80f );
+
+    color( FL_GREEN );
+    selection_color( FL_RED );
+
+    box( FL_ROUNDED_BOX );
+
+    minimum( 0.0f );
+    maximum( 1.0f );
+
+    value( 0.4f );
+}
+
+void
+VU_Meter::draw ( void )
+{
+    int v;
+
+    v = (value() / maximum()) * _divisions;
+
+    draw_box( FL_FLAT_BOX, x(), y(), w(), h(), FL_BLACK );
+
+    int bh = h() / _divisions;
+    int bw = w() / _divisions;
+
+    int b = 0;
+
+    for ( int p = _divisions; p > 0; p-- )
+    {
+        Fl_Color c = fl_color_average( selection_color(), color(), (float)p / _divisions );
+
+        if ( ! active_r() )
+            c = fl_inactive( c );
+
+        if ( p > v )
+            c = fl_color_average( FL_BLACK, c, _dim );
+
+        if ( _type == FL_HORIZONTAL )
+            draw_box( box(), x() + (p * bw), y(), bw, h(), c );
+        else
+            draw_box( box(), x(), y() + h() - (p * bh), w(), bh, c );
+
+    }
+
+    // we don't care about the label
+    // draw_label (tx, y() + by, tw, h() - bh);
+}

VU_Meter.H

@@ -0,0 +1,62 @@
+
+/*******************************************************************************/
+/* Copyright (C) 2008 Jonathan Moore Liles                                     */
+/*                                                                             */
+/* This program is free software; you can redistribute it and/or modify it     */
+/* under the terms of the GNU General Public License as published by the       */
+/* Free Software Foundation; either version 2 of the License, or (at your      */
+/* option) any later version.                                                  */
+/*                                                                             */
+/* This program is distributed in the hope that it will be useful, but WITHOUT */
+/* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or       */
+/* FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for   */
+/* more details.                                                               */
+/*                                                                             */
+/* You should have received a copy of the GNU General Public License along     */
+/* with This program; see the file COPYING.  If not,write to the Free Software */
+/* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+/*******************************************************************************/
+
+#pragma once
+
+#include <FL/Fl_Valuator.H> // for FL_HORIZONTAL and FL_VERTICAL
+
+class VU_Meter : public Fl_Widget
+{
+
+    float _value;
+    float _minimum;
+    float _maximum;
+
+    int _type;
+    int _divisions;
+    float _dim;
+
+protected:
+
+    virtual void draw ( void );
+
+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; }
+
+    void minimum ( float v ) { _minimum = v; redraw(); }
+    float minimum ( void ) const { return _minimum; }
+
+    void value ( float v ) { _value = v; redraw(); }
+    float value ( void ) const { return _value; }
+
+    bool divisions ( void ) const { return _divisions; }
+    void divisions ( int v ) { _divisions = v; }
+
+    int type ( void ) const { return _type; }
+    void type ( int v ) { _type = v; }
+
+    float dim ( void ) const { return _dim; }
+    void dim ( float v ) { _dim = v; redraw(); }
+
+};