本文整理汇总了C++中QwtPlotMarker::value方法的典型用法代码示例。如果您正苦于以下问题：C++ QwtPlotMarker::value方法的具体用法？C++ QwtPlotMarker::value怎么用？C++ QwtPlotMarker::value使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类QwtPlotMarker的用法示例。
在下文中一共展示了QwtPlotMarker::value方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: shiftMarkerCursor
// Select the next/previous neighbour of the selected point
// 0 = up
// 1 = down
// 2 = left
// 3 = right
void XtalOptPlot::shiftMarkerCursor(int direction)
{
if (!m_selectedMarker)
return;
QwtPlotMarker* selection = nullptr;
double dist = 1e300;
const QwtPlotItemList& itmList = itemList();
for (QwtPlotItemIterator it = itmList.begin(); it != itmList.end(); ++it) {
if ((*it)->rtti() == QwtPlotItem::Rtti_PlotMarker) {
QwtPlotMarker* m = static_cast<QwtPlotMarker*>(*it);
// Skip over the point that is already selected
if (m == m_selectedMarker)
continue;
// Find the distance and see if it is the shortest so far
// If we ever want to do this with canvas coordinates, this is how
// it is done:
// double x1 = canvasMap(m->xAxis()).transform(m->xValue());
// double y1 = canvasMap(m->yAxis()).transform(m->yValue());
// double x2 = canvasMap(m_selectedMarker->xAxis())
// .transform(m_selectedMarker->xValue());
// double y2 = canvasMap(m_selectedMarker->yAxis())
// .transform(m_selectedMarker->yValue());
// double d = distance(QPointF(x1, y1), QPointF(x2, y2));
double d = distance(m->value(), m_selectedMarker->value());
if (d > dist)
continue;
// Let's make sure the direction is correct as well
switch (direction) {
// up
case 0: {
// Check to make sure this is actually up
if (m->yValue() - m_selectedMarker->yValue() > 0.0) {
selection = m;
dist = d;
}
break;
}
// down
case 1: {
// Check to make sure this is actually down
if (m_selectedMarker->yValue() - m->yValue() > 0.0) {
selection = m;
dist = d;
}
break;
}
// left
case 2: {
// Check to make sure this is actually left
if (m_selectedMarker->xValue() - m->xValue() > 0.0) {
selection = m;
dist = d;
}
break;
}
// right
case 3: {
// Check to make sure this is actually right
if (m->xValue() - m_selectedMarker->xValue() > 0.0) {
selection = m;
dist = d;
}
break;
}
}
}
}
selectMarker(selection);
}