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HDSPMixerFader.cxx

/*
 *   HDSPMixer
 *    
 *   Copyright (C) 2003 Thomas Charbonnel (thomas@undata.org)
 *    
 *   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; if not, write to the Free Software
 *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#pragma implementation
#include "HDSPMixerFader.h"

HDSPMixerFader::HDSPMixerFader(int x, int y, double r, int id, int src):Fl_Widget(x, y, 13, 153)
{
    index = id;
    source = src;
    ndb = (int)(CF*(double)(log(0.5*(exp(3.0)-1)+1)*(double)(FADER_HEIGHT)/3.0));
    non_submix_dest = 0;
    dest = 0;
    ref = r;
    basew = (HDSPMixerWindow *)window();
    anchor = lastpos = lasty = drag = shift_orig = y_orig = 0;
    for (int i = 0; i < 14; i++) {
      pos[i] = 0;
    }
}

void HDSPMixerFader::draw()
{
    fl_draw_pixmap(Slider1_xpm, x(), y()+139-(int)(pos[dest]/CF));
}

int HDSPMixerFader::handle(int e)
{
    int button3 = Fl::event_button3();
    int shift = Fl::event_shift();
    int ctrl = Fl::event_ctrl();
    int ypos = Fl::event_y()-y();
    switch (e) {
      case FL_PUSH:
          if (onSlider(ypos)) {
            anchor = 144-ypos-(int)(pos[dest]/CF);
            if (button3) relative->set(pos[dest]);
            return 1;
          }
          anchor = 0;
          if (ctrl) {
            pos[dest] = ndb;
          } else if (ypos < 7) {
            pos[dest] = 137*CF;
          } else if (ypos > 6 && ypos < 146) {
            pos[dest] = (144-ypos)*CF;
          } else if (ypos > 145) {
            pos[dest] = 0;
          } 
          if (lastpos != pos[dest]) {
            basew->setMixer(index, source, dest);
            sendGain();
            lastpos = pos[dest];
          }
          if (lasty != (int)(pos[dest]/CF)) {
            redraw();
            lasty = (int)(pos[dest]/CF);
          }
          if (button3) relative->set(pos[dest]);
          shift_orig = pos[dest];
          y_orig = ypos;
          basew->checkState();
          return 1;
      case FL_DRAG:
          ypos += anchor;
          if (ctrl) {
            pos[dest] = ndb;
            shift_orig = pos[dest];
            y_orig = ypos;
          } else if ((ypos > 6 && ypos < 146) || drag) {
            drag = 1;
            if (shift) {
                pos[dest] = (y_orig-ypos)+shift_orig;
                if (pos[dest] < 0) pos[dest] = 0;
                if (pos[dest] > 137*CF) pos[dest] = 137*CF;
            } else {
                if (ypos < 7) {
                  pos[dest] = 137*CF;
                } else if (ypos > 144) {
                  pos[dest] = 0;
                } else {
                  pos[dest] = (144-ypos)*CF;
                }
                shift_orig = pos[dest];   
                y_orig = ypos;
            }
          }
          if (lastpos != pos[dest]) {
            basew->setMixer(index, source, dest);
            sendGain();
            lastpos = pos[dest];
          }
          if (lasty != (int)(pos[dest]/CF)) {
            redraw();
            lasty = (int)(pos[dest]/CF);
          }
          if (button3) relative->set(pos[dest]);
          basew->checkState();
          return 1;
      case FL_RELEASE:
          drag = 0;
          anchor = 0;
          return 1;   
      default :
          return Fl_Widget::handle(e);
    }
}

int HDSPMixerFader::onSlider(int ypos)
{
    if (ypos > (139-(int)(pos[dest]/CF)) && ypos < (151-(int)(pos[dest]/CF))) {
      return 1;
    }
    return 0;
}

void HDSPMixerFader::set(int p)
{
    if (p != pos[dest]) {
      pos[dest] = lastpos = p;
      basew->setMixer(index, source, dest);
      sendGain();
    }
    if (lasty != (int)(pos[dest]/CF)) {
      lasty = (int)(pos[dest]/CF);
      redraw();
    }
}

int HDSPMixerFader::posToInt(int p) {
    double x, y;
    
    if (p == ndb) return 32768;
    if (p == 137*CF) return 65535;
    if (p == 0) return 0;
    
    x = ((double)(p)) / (double)(137*CF);
    y = 65535.0 * (exp(3.0 * x) - 1.0) / (exp(3.0) - 1.0);
    if (y > 65535.0) y = 65535.0;
    if (y < 0.0) y = 0.0;
    return (int)y;
}

void HDSPMixerFader::posToLog(char *s)
{
    double db, fpos;
    
    if (posToInt(pos[dest]) == 0) {
      snprintf(s, 10, "-oo");
      return;
    }    
    fpos = (double)posToInt(pos[dest]) / ref;
    db = 20.0 * log10(fpos);
    snprintf(s, 10, "%.1f", db);
}

void HDSPMixerFader::sendGain()
{
    char buf[10];
    posToLog(buf);
    gain->setText(buf);
}


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