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/***************************************************************************
wvumeter.cpp - description
-------------------
begin : Fri Jul 22 2003
copyright : (C) 2003 by Tue & Ken Haste Andersen
email : haste@diku.dk
***************************************************************************/
/***************************************************************************
* *
* 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. *
* *
***************************************************************************/
#include "widget/wvumeter.h"
#include <QPaintEvent>
#include <QPainter>
#include <QtDebug>
#include <QPixmap>
#include "widget/wpixmapstore.h"
#include "util/timer.h"
#define DEFAULT_FALLTIME 20
#define DEFAULT_FALLSTEP 1
#define DEFAULT_HOLDTIME 400
#define DEFAULT_HOLDSIZE 5
WVuMeter::WVuMeter(QWidget * parent) :
WWidget(parent),
m_iNoPos(0),
m_pPixmapBack(NULL),
m_pPixmapVu(NULL),
m_iPeakHoldSize(0),
m_iPeakPos(0),
m_iPeakHoldCountdown(0) {
}
WVuMeter::~WVuMeter()
{
resetPositions();
}
void WVuMeter::setup(QDomNode node)
{
// Set pixmaps
bool bHorizontal = false;
if (!selectNode(node, "Horizontal").isNull() &&
selectNodeQString(node, "Horizontal")=="true")
bHorizontal = true;
setPixmaps(getPath(selectNodeQString(node, "PathBack")),
getPath(selectNodeQString(node, "PathVu")), bHorizontal);
m_iPeakHoldSize = selectNodeInt(node, "PeakHoldSize");
if(m_iPeakHoldSize < 0 || m_iPeakHoldSize > 100)
m_iPeakHoldSize = DEFAULT_HOLDSIZE;
m_iPeakFallStep = selectNodeInt(node, "PeakFallStep");
if(m_iPeakFallStep < 1 || m_iPeakFallStep > 1000)
m_iPeakFallStep = DEFAULT_FALLSTEP;
m_iPeakHoldTime = selectNodeInt(node, "PeakHoldTime");
if(m_iPeakHoldTime < 1 || m_iPeakHoldTime > 3000)
m_iPeakHoldTime = DEFAULT_HOLDTIME;
m_iPeakFallTime = selectNodeInt(node, "PeakFallTime");
if(m_iPeakFallTime < 1 || m_iPeakFallTime > 1000)
m_iPeakFallTime = DEFAULT_FALLTIME;
}
void WVuMeter::resetPositions()
{
WPixmapStore::deletePixmap(m_pPixmapBack);
m_pPixmapBack = NULL;
WPixmapStore::deletePixmap(m_pPixmapVu);
m_pPixmapVu = NULL;
}
void WVuMeter::setPixmaps(const QString &backFilename, const QString &vuFilename, bool bHorizontal)
{
m_pPixmapBack = WPixmapStore::getPixmap(backFilename);
if (!m_pPixmapBack || m_pPixmapBack->size() == QSize(0,0)) {
qDebug() << "WVuMeter: Error loading back pixmap" << backFilename;
} else {
setFixedSize(m_pPixmapBack->size());
}
m_pPixmapVu = WPixmapStore::getPixmap(vuFilename);
if (!m_pPixmapVu || m_pPixmapVu->size() == QSize(0,0)) {
qDebug() << "WVuMeter: Error loading vu pixmap" << vuFilename;
} else {
m_bHorizontal = bHorizontal;
if (m_bHorizontal) {
m_iNoPos = m_pPixmapVu->width();
} else {
m_iNoPos = m_pPixmapVu->height();
}
}
}
void WVuMeter::setValue(double fValue)
{
int idx = (int)(fValue * (float)(m_iNoPos)/128.);
// Range check
if (idx>m_iNoPos)
idx = m_iNoPos;
else if (idx<0)
idx = 0;
setPeak(idx);
m_fValue = fValue;
QTime currentTime = QTime::currentTime();
int msecsElapsed = m_lastUpdate.msecsTo(currentTime);
m_lastUpdate = currentTime;
updateState(msecsElapsed);
//Post a paintEvent() message, so that the widget repaints.
update();
}
void WVuMeter::setPeak(int pos)
{
if(pos > m_iPeakPos)
{
m_iPeakPos = pos;
m_iPeakHoldCountdown = m_iPeakHoldTime;
}
}
void WVuMeter::updateState(int msecsElapsed)
{
// If we're holding at a peak then don't update anything
m_iPeakHoldCountdown -= msecsElapsed;
if (m_iPeakHoldCountdown > 0) {
return;
} else {
m_iPeakHoldCountdown = 0;
}
// Otherwise, decrement the peak position by the fall step size times the
// milliseconds elapsed over the fall time multiplier. The peak will fall
// FallStep times (out of 128 steps) every FallTime milliseconds.
m_iPeakPos -= float(m_iPeakFallStep) * float(msecsElapsed) / float(m_iPeakFallTime);
if (m_iPeakPos < 0)
m_iPeakPos = 0;
}
void WVuMeter::paintEvent(QPaintEvent *)
{
ScopedTimer t("WVuMeter::paintEvent");
if (m_pPixmapBack && m_pPixmapVu) {
int idx = (int)(m_fValue*(float)(m_iNoPos)/128.);
// Range check
if (idx>m_iNoPos)
idx = m_iNoPos;
else if (idx<0)
idx = 0;
QPainter painter(this);
// Draw back
painter.drawPixmap(0, 0, *m_pPixmapBack);
// Draw (part of) vu
if (m_bHorizontal)
{
//This is a hack to fix something weird with horizontal VU meters:
if(idx == 0)
idx = 1;
painter.drawPixmap(0, 0, *m_pPixmapVu, 0, 0, idx, m_pPixmapVu->height());
if(m_iPeakHoldSize > 0 && m_iPeakPos > 0)
{
painter.drawPixmap(m_iPeakPos-m_iPeakHoldSize, 0, *m_pPixmapVu,
m_iPeakPos-m_iPeakHoldSize, 0, m_iPeakHoldSize, m_pPixmapVu->height());
}
}
else
{
painter.drawPixmap(0, m_iNoPos-idx, *m_pPixmapVu, 0, m_iNoPos-idx, m_pPixmapVu->width(), idx);
if(m_iPeakHoldSize > 0 && m_iPeakPos > 0)
{
painter.drawPixmap(0, m_pPixmapVu->height()-m_iPeakPos, *m_pPixmapVu,
0, m_pPixmapVu->height()-m_iPeakPos, m_pPixmapVu->width(), m_iPeakHoldSize);
}
}
}
}
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