git.sesse.net Git - nageru/blob - vumeter.cpp

   1 #include <QPainter>
   2
   3 #include "vumeter.h"
   4 #include "vu_common.h"
   5
   6 using namespace std;
   7
   8 VUMeter::VUMeter(QWidget *parent)
   9         : QWidget(parent)
  10 {
  11 }
  12
  13 void VUMeter::resizeEvent(QResizeEvent *event)
  14 {
  15         recalculate_pixmaps();
  16 }
  17
  18 void VUMeter::paintEvent(QPaintEvent *event)
  19 {
  20         QPainter painter(this);
  21
  22         float level_lufs;
  23         {
  24                 unique_lock<mutex> lock(level_mutex);
  25                 level_lufs = this->level_lufs;
  26         }
  27
  28         float level_lu = level_lufs - ref_level_lufs;
  29         int on_pos = lrint(lufs_to_pos(level_lu, height()));
  30
  31         if (flip) {
  32                 QRect on_rect(0, 0, width(), height() - on_pos);
  33                 QRect off_rect(0, height() - on_pos, width(), height());
  34
  35                 painter.drawPixmap(on_rect, on_pixmap, on_rect);
  36                 painter.drawPixmap(off_rect, off_pixmap, off_rect);
  37         } else {
  38                 QRect off_rect(0, 0, width(), on_pos);
  39                 QRect on_rect(0, on_pos, width(), height() - on_pos);
  40
  41                 painter.drawPixmap(off_rect, off_pixmap, off_rect);
  42                 painter.drawPixmap(on_rect, on_pixmap, on_rect);
  43         }
  44 }
  45
  46 void VUMeter::recalculate_pixmaps()
  47 {
  48         on_pixmap = QPixmap(width(), height());
  49         QPainter on_painter(&on_pixmap);
  50         draw_vu_meter(on_painter, width(), height(), 0, true, min_level, max_level, flip);
  51
  52         off_pixmap = QPixmap(width(), height());
  53         QPainter off_painter(&off_pixmap);
  54         draw_vu_meter(off_painter, width(), height(), 0, false, min_level, max_level, flip);
  55 }