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[2];
  23         {
  24                 unique_lock<mutex> lock(level_mutex);
  25                 level_lufs[0] = this->level_lufs[0];
  26                 level_lufs[1] = this->level_lufs[1];
  27         }
  28
  29         int mid = width() / 2;
  30
  31         for (unsigned channel = 0; channel < 2; ++channel) {
  32                 int left = (channel == 0) ? 0 : mid;
  33                 int right = (channel == 0) ? mid : width();
  34                 float level_lu = level_lufs[channel] - ref_level_lufs;
  35                 int on_pos = lrint(lufs_to_pos(level_lu, height()));
  36
  37                 if (flip) {
  38                         QRect on_rect(left, 0, right, height() - on_pos);
  39                         QRect off_rect(left, height() - on_pos, right, height());
  40
  41                         painter.drawPixmap(on_rect, on_pixmap, on_rect);
  42                         painter.drawPixmap(off_rect, off_pixmap, off_rect);
  43                 } else {
  44                         QRect off_rect(left, 0, right, on_pos);
  45                         QRect on_rect(left, on_pos, right, height() - on_pos);
  46
  47                         painter.drawPixmap(off_rect, off_pixmap, off_rect);
  48                         painter.drawPixmap(on_rect, on_pixmap, on_rect);
  49                 }
  50         }
  51 }
  52
  53 void VUMeter::recalculate_pixmaps()
  54 {
  55         on_pixmap = QPixmap(width(), height());
  56         QPainter on_painter(&on_pixmap);
  57         draw_vu_meter(on_painter, width(), height(), 0, true, min_level, max_level, flip);
  58
  59         off_pixmap = QPixmap(width(), height());
  60         QPainter off_painter(&off_pixmap);
  61         draw_vu_meter(off_painter, width(), height(), 0, false, min_level, max_level, flip);
  62 }