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|
//=========================================================
// MusE
// Linux Music Editor
// $Id: meter.cpp,v 1.4.2.2 2009/05/03 04:14:00 terminator356 Exp $
//
// (C) Copyright 2000 Werner Schweer (ws@seh.de)
//=========================================================
#include <stdio.h>
#include <cmath>
#include <QMouseEvent>
#include <QPainter>
#include <QResizeEvent>
#include "meter.h"
#include "gconfig.h"
#include "fastlog.h"
//---------------------------------------------------------
// Meter
//---------------------------------------------------------
Meter::Meter(QWidget* parent, MeterType type)
: QFrame(parent) //Qt::WNoAutoErase
{
setBackgroundRole(QPalette::NoRole);
setAttribute(Qt::WA_NoSystemBackground);
setAttribute(Qt::WA_StaticContents);
// This is absolutely required for speed! Otherwise painfully slow because we get
// full rect paint events even on small scrolls! See help on QPainter::scroll().
setAttribute(Qt::WA_OpaquePaintEvent);
mtype = type;
overflow = false;
val = 0.0;
maxVal = 0.0;
minScale = mtype == DBMeter ? config.minMeter : 0.0; // min value in dB or int
maxScale = mtype == DBMeter ? 10.0 : 127.0;
yellowScale = -10;
redScale = 0;
setLineWidth(0);
setMidLineWidth(0);
}
//---------------------------------------------------------
// setVal
//---------------------------------------------------------
void Meter::setVal(double v, double max, bool ovl)
{
overflow = ovl;
bool ud = false;
if(mtype == DBMeter)
{
double minScaleLin = pow(10.0, minScale/20.0);
if((v >= minScaleLin && val != v) || val >= minScaleLin)
{
val = v;
ud = true;
}
}
else
{
if(val != v)
{
val = v;
ud = true;
}
}
if(maxVal != max)
{
maxVal = max;
ud = true;
}
if(ud)
update();
}
//---------------------------------------------------------
// resetPeaks
// reset peak and overflow indicator
//---------------------------------------------------------
void Meter::resetPeaks()
{
maxVal = val;
overflow = val > 0.0;
update();
}
//---------------------------------------------------------
// setRange
//---------------------------------------------------------
void Meter::setRange(double min, double max)
{
minScale = min;
maxScale = max;
update();
}
//---------------------------------------------------------
// paintEvent
//---------------------------------------------------------
void Meter::paintEvent(QPaintEvent* /*ev*/)
{
// TODO: Could make better use of event rectangle, for speed.
QPainter p(this);
double range = maxScale - minScale;
int fw = frameWidth();
int w = width() - 2*fw;
int h = height() - 2*fw;
int yv;
if(mtype == DBMeter)
yv = val == 0 ? h : int(((maxScale - (fast_log10(val) * 20.0)) * h)/range);
else
yv = val == 0 ? h : int(((maxScale - val) * h)/range);
if(yv > h) yv = h;
// Draw the red, green, and yellow sections.
drawVU(p, w, h, yv);
// Draw the peak white line.
int ymax;
if(mtype == DBMeter)
ymax = maxVal == 0 ? 0 : int(((maxScale - (fast_log10(maxVal) * 20.0)) * h)/range);
else
ymax = maxVal == 0 ? 0 : int(((maxScale - maxVal) * h)/range);
p.setPen(Qt::white);
p.drawLine(0, ymax, w, ymax);
}
//---------------------------------------------------------
// drawVU
//---------------------------------------------------------
void Meter::drawVU(QPainter& p, int w, int h, int yv)
{
if(mtype == DBMeter)
{
double range = maxScale - minScale;
int y1 = int((maxScale - redScale) * h / range);
int y2 = int((maxScale - yellowScale) * h / range);
if(yv < y1)
{
// Red section:
p.fillRect(0, 0, w, yv, QBrush(0x8e0000)); // dark red
p.fillRect(0, yv, w, y1-yv, QBrush(0xff0000)); // light red
// Yellow section:
p.fillRect(0, y1, w, y2-y1, QBrush(0xffff00)); // light yellow
// Green section:
p.fillRect(0, y2, w, h-y2, QBrush(0x00ff00)); // light green
}
else
if(yv < y2)
{
// Red section:
p.fillRect(0, 0, w, y1, QBrush(0x8e0000)); // dark red
// Yellow section:
p.fillRect(0, y1, w, yv-y1, QBrush(0x8e8e00)); // dark yellow
p.fillRect(0, yv, w, y2-yv, QBrush(0xffff00)); // light yellow
// Green section:
p.fillRect(0, y2, w, h-y2, QBrush(0x00ff00)); // light green
}
else
//if(yv <= y3)
{
// Red section:
p.fillRect(0, 0, w, y1, QBrush(0x8e0000)); // dark red
// Yellow section:
p.fillRect(0, y1, w, y2-y1, QBrush(0x8e8e00)); // dark yellow
// Green section:
p.fillRect(0, y2, w, yv-y2, QBrush(0x007000)); // dark green
p.fillRect(0, yv, w, h-yv, QBrush(0x00ff00)); // light green
}
}
else
{
p.fillRect(0, 0, w, yv, QBrush(0x007000)); // dark green
p.fillRect(0, yv, w, h-yv, QBrush(0x00ff00)); // light green
}
}
//---------------------------------------------------------
// resizeEvent
//---------------------------------------------------------
void Meter::resizeEvent(QResizeEvent* /*ev*/)
{
}
//---------------------------------------------------------
// mousePressEvent
//---------------------------------------------------------
void Meter::mousePressEvent(QMouseEvent*)
{
emit mousePress();
}
|
