nn-usb-fpga/Examples/ADC/QT_src/signaldisplay.cpp

#include "signaldisplay.h"
#include <QtGui>
#include <QDebug>

SignalDisplay::SignalDisplay(QWidget *&parent):QWidget(parent)
{
	colorTrace = Qt::blue;
    secsPerDiv = 1.0/600.0;
	voltsPerDiv = 20;
	setPointsPerPlot(10);
}

void SignalDisplay::setPointsPerPlot(int value)
{
	pointsPerPlot = value;
	waves = new QPoint[pointsPerPlot];
	secsIdx =  0;
}

void SignalDisplay::drawGrid(QPainter &p, QColor colorGrid, int x, int y, int w, int h, int nx, int ny){
	p.setPen(colorGrid);
	for (int ix= 0; ix<nx; ix++){
		int x = ix*w/nx;
		p.drawLine(x,0,x,h);
	}
	for (int iy = 0; iy < ny; iy++){
		int y = iy*h/ny;
		p.drawLine(0,y,w,y);
	}
}
void SignalDisplay::paintEvent(QPaintEvent *event){
	QPainter painter(this);
	w = width();
	h = height();
	ox = w;
	oy = h;
	painter.fillRect(0,0,w,h,Qt::gray);
	painter.setPen(Qt::white);
	//painter.drawLine(secsIdx*w/10/60.0/pointsPerPlot/secsPerDiv,0, \
	//				 secsIdx*w/10/60.0/pointsPerPlot/secsPerDiv,h);
	drawGrid(painter, Qt::darkGray,0,0,w,h,4, 10);

	/*for(int i = 0; i < 	pointsPerPlot; i++)
	{
		painter.fillRect(waves[i].x()-w/pointsPerPlot/2,waves[i].y(), \
							   w/pointsPerPlot,h-waves[i].y(), Qt::blue);
	}*/
	painter.setPen(colorTrace);
	painter.drawPolyline(waves,pointsPerPlot);

}

void SignalDisplay::addPoint( int value1)
{
	waves[secsIdx] = 	QPoint(secsIdx*w/10/60.0/pointsPerPlot/secsPerDiv+w/(2*pointsPerPlot), \
						oy-value1*h/voltsPerDiv/10);
	secsIdx = (secsIdx+1) % pointsPerPlot;
}

//EOF