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vu.h

/*
 * Copyright (c) 1991-1994 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    This product includes software developed by the Computer Systems
 *    Engineering Group at Lawrence Berkeley Laboratory.
 * 4. Neither the name of the University nor of the Laboratory may be used
 *    to endorse or promote products derived from this software without
 *    specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * @(#) $Header: vu.h,v 1.8 96/03/16 13:12:55 van Exp $ (LBL)
 */

#ifndef vat_vu_h
#define vat_vu_h

#include "tkwidget.h"

class VUMeter : public TkWidget {
    public:
      VUMeter(const char* path,
            double scale, double lpfgain = .75, int width = 10);
      void set(double);
      virtual int command(int argc, const char*const* argv);
    protected:
      virtual void draw();
      virtual void update();
      virtual void resize();
      virtual double warp(double value) const = 0;

      double value_;          /* current (mean) level */
      double alpha_;          /* low-pass filter time constant */
    private:
      inline void rect(Display* dpy, Drawable win, GC gc,
                   int x0, int y0, int w, int h) const;

      double scale_;

      int barht_;
      int gap_;

      int nlevel_;            /* number of discrete levels (i.e., blocks) */
      int hot_level_;         /* blk number we display in VatVU.hot color */
      int topblk_;            /* index of topmost block displayed */
      int ntop_;
      int peak_;        /* top block for peak indicator */
      int peakcnt_;           /* hysteresis for peak indicator */
      int setpeak_;

      static GC bg_;
      static GC fg_;
      static GC gray_;
      static GC hot_;
};

class DBMeter : public VUMeter {
    public:
      DBMeter(const char* path,
            double scale, double lpfgain = .75, int width = 10);
    protected:
      virtual double warp(double value) const;
};

class LinearMeter : public VUMeter {
    public:
      LinearMeter(const char* path,
                double scale, double lpfgain = .75, int width = 10);
    protected:
      virtual double warp(double value) const;
};

#endif

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