eko/cvlevelmeter.cpp at master · manul-pointer/eko · GitHub

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#include <QPainter>
#include <QPoint>

#include "cvlevelmeter.h"
#include "utils.h"
#include "db.h"


void CVLevelMeter::update_scale_image()
{
  QImage im (scale_width, height(), QImage::Format_RGB32);

  QPainter painter (&im);

  painter.fillRect (0, 0, scale_width, height(), Qt::white);

  painter.setPen (Qt::black);
  painter.setFont (QFont ("Mono", 6));

  int ten = get_value (height(), 5);

  int percentage = 105;
  float ff = 0.0f;

  for (int y = 0; y < height(); y++)
      {
       if (! (y % ten))
          {
           percentage -= 5;

           ff = (1.0 / 100) * percentage;

           QPoint p1 (1, y);
           QPoint p2 (scale_width, y);
           painter.drawLine (p1, p2);

           painter.drawText (QPoint (1, y), QString::number (float2db (ff), 'g', 2)); //dB
          }
       }

  img_bar = im;
}


void CVLevelMeter::resizeEvent(QResizeEvent *event)
{
  update_scale_image();
}


CVLevelMeter::CVLevelMeter (QWidget *parent)
{
  peak_l = 0;
  peak_r = 0;

  scale_width = 42;
  bars_width = 48;

  setMinimumWidth (scale_width + bars_width);

  resize (scale_width + bars_width, 256);
}


#define FALLOFF_COEF 0.05f

void CVLevelMeter::paintEvent (QPaintEvent *event)
{
  if (pl > peak_l)
     peak_l = pl;
  else
      peak_l -= FALLOFF_COEF;

  if (pr > peak_r)
     peak_r = pr;
  else
      peak_r -= FALLOFF_COEF;

  if (peak_l < -1 || peak_l > 1)
     peak_l = 0;

  if (peak_r < -1 || peak_r > 1)
     peak_r = 0;

  QPainter painter (this);

  int h = height();
  int w = width();

  painter.fillRect (scale_width, 0, w, h, Qt::white);

  int lenl = h - (int)(peak_l * 1.0f * h);
  int lenr = h - (int)(peak_r * 1.0f * h);

  QPoint ltop (scale_width, h);
  QPoint lbottom (scale_width + (w - scale_width) / 2, lenl);

  QPoint rtop (scale_width + (w - scale_width) / 2, h);
  QPoint rbottom (w, lenr);

  QRect l (ltop, lbottom);
  QRect r (rtop, rbottom);

  painter.fillRect (l, Qt::green);
  painter.fillRect (r, Qt::darkGreen);

  painter.drawImage (1, 1, img_bar);

  event->accept();
}