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Saturday, April 12th 2008, 5:03pm
RE: QwtGrid Plot
Hi Nicolas thank you for the reply. I tried this but i still have some errors.
Hey pls tell me how i have use QwtGrid class in this program.
Thank You Nicolas
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Source code |
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void PlottingGraph::draw()
{
m_time++;
memmove(m_y, &m_y[1], 99 * sizeof(double));
m_y[99] = 10000 * sin((double)m_time / 360 * 3.1415 * 10) + rand() % 4000 - 2000;//m_y[99] = 100 * sin((double)m_time / 360 * 3.1415 * 10) + rand() % 400 - 200;
for (int i = 0; i < 100; i++)
m_x[i]++;
if (!m_curve)
{
qreal left = int(rect.left()) - (int(rect.left()) % gridSize);
qreal top = int(rect.top()) - (int(rect.top()) % gridSize);
QVarLengthArray<QLineF, 100> lines;
for (qreal x = left; x < rect.right(); x += gridSize)
lines.append(QLineF(x, rect.top(), x, rect.bottom()));
for (qreal y = top; y < rect.bottom(); y += gridSize)
lines.append(QLineF(rect.left(), y, rect.right(), y));
qDebug() << lines.size();
painter->drawLines(lines.data(), lines.size());
m_curve = new QwtPlotCurve();
m_curve->setPen(QPen(Qt::blue));//setPen(QPen(QColor::fromRgb(255, 255, 0), 3));
m_curve->setData(m_x, m_y, 100);
m_curve->attach(myPlot);
}
m_curve->setData(m_x, m_y, 100);
myPlot->setAxisScale(QwtPlot::xBottom, m_time, m_time + 100); // auto replots
}
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Hey pls tell me how i have use QwtGrid class in this program.
Thank You Nicolas