//////////////////////////////////////////////////////////////////////
// Called to update spectrum data for displaying on the screen
//////////////////////////////////////////////////////////////////////
void CPlotter::draw()
{
int i,n;
int w;
int h;
int xmin, xmax;
if (m_DrawOverlay)
{
drawOverlay();
m_DrawOverlay = false;
}
QPoint LineBuf[MAX_SCREENSIZE];
if (!m_Running)
return;
// get/draw the waterfall
w = m_WaterfallPixmap.width();
h = m_WaterfallPixmap.height();
// no need to draw if pixmap is invisible
if ((w != 0) || (h != 0))
{
// move current data down one line(must do before attaching a QPainter object)
m_WaterfallPixmap.scroll(0,1,0,0, w, h);
QPainter painter1(&m_WaterfallPixmap);
// get scaled FFT data
getScreenIntegerFFTData(255, qMin(w, MAX_SCREENSIZE),
m_MaxdB, m_MindB,
m_FftCenter - (qint64)m_Span/2,
m_FftCenter + (qint64)m_Span/2,
m_wfData, m_fftbuf,
&xmin, &xmax);
// draw new line of fft data at top of waterfall bitmap
painter1.setPen(QColor(0, 0, 0));
for (i = 0; i < xmin; i++)
painter1.drawPoint(i,0);
for (i = xmax; i < w; i++)
painter1.drawPoint(i,0);
for (i = xmin; i < xmax; i++)
{
painter1.setPen(m_ColorTbl[ 255-m_fftbuf[i] ]);
painter1.drawPoint(i,0);
}
}
// get/draw the 2D spectrum
w = m_2DPixmap.width();
h = m_2DPixmap.height();
if ((w != 0) || (h != 0))
{
// first copy into 2Dbitmap the overlay bitmap.
m_2DPixmap = m_OverlayPixmap.copy(0,0,w,h);
QPainter painter2(&m_2DPixmap);
// workaround for "fixed" line drawing since Qt 5
// see http://stackoverflow.com/questions/16990326
#if QT_VERSION >= 0x050000
painter2.translate(0.5, 0.5);
#endif
// get new scaled fft data
getScreenIntegerFFTData(h, qMin(w, MAX_SCREENSIZE),
m_MaxdB, m_MindB,
m_FftCenter - (qint64)m_Span/2,
m_FftCenter + (qint64)m_Span/2,
m_fftData, m_fftbuf,
&xmin, &xmax);
// draw the pandapter
painter2.setPen(m_FftColor);
n = xmax - xmin;
for (i = 0; i < n; i++)
{
LineBuf[i].setX(i + xmin);
LineBuf[i].setY(m_fftbuf[i + xmin]);
}
if (m_FftFill)
{
QLinearGradient linGrad(QPointF(xmin, h), QPointF(xmin, 0));
linGrad.setColorAt(0.0, m_FftCol0);
linGrad.setColorAt(1.0, m_FftCol1);
painter2.setBrush(QBrush(QGradient(linGrad)));
if (n < MAX_SCREENSIZE-2)
{
LineBuf[n].setX(xmax-1);
LineBuf[n].setY(h);
LineBuf[n+1].setX(xmin);
LineBuf[n+1].setY(h);
painter2.drawPolygon(LineBuf, n+2);
}
else
{
LineBuf[MAX_SCREENSIZE-2].setX(xmax-1);
LineBuf[MAX_SCREENSIZE-2].setY(h);
LineBuf[MAX_SCREENSIZE-1].setX(xmin);
LineBuf[MAX_SCREENSIZE-1].setY(h);
painter2.drawPolygon(LineBuf, n);
}
}
else
{
painter2.drawPolyline(LineBuf, n);
}
}
// trigger a new paintEvent
update();
}
//////////////////////////////////////////////////////////////////////
// Called to update spectrum data for displaying on the screen
//////////////////////////////////////////////////////////////////////
void CPlotter::draw()
{
int i,n;
int w;
int h;
int xmin, xmax;
if (m_DrawOverlay)
{
drawOverlay();
m_DrawOverlay = false;
}
QPoint LineBuf[MAX_SCREENSIZE];
if (!m_Running)
return;
// get/draw the waterfall
w = m_WaterfallPixmap.width();
h = m_WaterfallPixmap.height();
// no need to draw if pixmap is invisible
if ((w != 0) || (h != 0))
{
// move current data down one line(must do before attaching a QPainter object)
m_WaterfallPixmap.scroll(0,1,0,0, w, h);
QPainter painter1(&m_WaterfallPixmap);
// get scaled FFT data
getScreenIntegerFFTData(255, qMin(w, MAX_SCREENSIZE),
m_MaxdB, m_MindB,
m_FftCenter - (qint64)m_Span/2,
m_FftCenter + (qint64)m_Span/2,
m_wfData, m_fftbuf,
&xmin, &xmax);
// draw new line of fft data at top of waterfall bitmap
painter1.setPen(QColor(0, 0, 0));
for (i = 0; i < xmin; i++)
painter1.drawPoint(i,0);
for (i = xmax; i < w; i++)
painter1.drawPoint(i,0);
for (i = xmin; i < xmax; i++)
{
painter1.setPen(m_ColorTbl[ 255-m_fftbuf[i] ]);
painter1.drawPoint(i,0);
}
}
// get/draw the 2D spectrum
w = m_2DPixmap.width();
h = m_2DPixmap.height();
if ((w != 0) || (h != 0))
{
// first copy into 2Dbitmap the overlay bitmap.
m_2DPixmap = m_OverlayPixmap.copy(0,0,w,h);
QPainter painter2(&m_2DPixmap);
// workaround for "fixed" line drawing since Qt 5
// see http://stackoverflow.com/questions/16990326
#if QT_VERSION >= 0x050000
painter2.translate(0.5, 0.5);
#endif
// get new scaled fft data
getScreenIntegerFFTData(h, qMin(w, MAX_SCREENSIZE),
m_MaxdB, m_MindB,
m_FftCenter - (qint64)m_Span/2,
m_FftCenter + (qint64)m_Span/2,
m_fftData, m_fftbuf,
&xmin, &xmax);
// draw the pandapter
painter2.setPen(m_FftColor);
n = xmax - xmin;
for (i = 0; i < n; i++)
{
LineBuf[i].setX(i + xmin);
LineBuf[i].setY(m_fftbuf[i + xmin]);
}
if (m_FftFill)
{
QLinearGradient linGrad(QPointF(xmin, h), QPointF(xmin, 0));
linGrad.setColorAt(0.0, m_FftCol0);
linGrad.setColorAt(1.0, m_FftCol1);
painter2.setBrush(QBrush(QGradient(linGrad)));
if (n < MAX_SCREENSIZE-2)
{
LineBuf[n].setX(xmax-1);
LineBuf[n].setY(h);
LineBuf[n+1].setX(xmin);
LineBuf[n+1].setY(h);
painter2.drawPolygon(LineBuf, n+2);
}
else
{
LineBuf[MAX_SCREENSIZE-2].setX(xmax-1);
LineBuf[MAX_SCREENSIZE-2].setY(h);
LineBuf[MAX_SCREENSIZE-1].setX(xmin);
LineBuf[MAX_SCREENSIZE-1].setY(h);
painter2.drawPolygon(LineBuf, n);
}
}
else
{
painter2.drawPolyline(LineBuf, n);
}
//Peak detection
if (m_PeakDetection > 0)
{
m_Peaks.clear();
float mean = 0;
float sum_of_sq = 0;
for (i = 0; i < n; i++)
{
mean += m_fftbuf[i + xmin];
sum_of_sq += m_fftbuf[i + xmin] * m_fftbuf[i + xmin];
}
mean /= n;
float stdev= sqrt( sum_of_sq/n-mean*mean );
int lastPeak=-1;
for (i = 0; i < n; i++)
{
//m_PeakDetection times the std over the mean or better than current peak
float d = (lastPeak==-1) ? (mean - m_PeakDetection * stdev) :
m_fftbuf[lastPeak+xmin];
if (m_fftbuf[i + xmin] < d)
lastPeak=i;
if (lastPeak != -1 && (i - lastPeak > PEAK_H_TOLERANCE || i == n-1))
{
m_Peaks.insert(lastPeak+xmin, m_fftbuf[lastPeak + xmin]);
painter2.drawEllipse(lastPeak+xmin-5, m_fftbuf[lastPeak + xmin]-5, 10, 10);
lastPeak=-1;
}
}
}
//Peak hold
if (m_PeakHoldActive)
{
for (i = 0; i < n; i++)
{
if(!m_PeakHoldValid || m_fftbuf[i] < m_fftPeakHoldBuf[i])
m_fftPeakHoldBuf[i] = m_fftbuf[i];
LineBuf[i].setX(i + xmin);
LineBuf[i].setY(m_fftPeakHoldBuf[i + xmin]);
}
painter2.setPen(m_PeakHoldColor);
painter2.drawPolyline(LineBuf, n);
m_PeakHoldValid=true;
}
painter2.end();
}
// trigger a new paintEvent
update();
}
