CloudCompare forum

ccPointListPickingDlg::getPickedPoints()

How do I call it in the plugin to get the coordinates of the point selected by the mouse?

ccPointListPickingDlg *point_list_picking;
std::vector<cc2DLabel*> labels;
const int count = static_cast<int>(point_list_picking->getPickedPoints(labels)); //Crashes here

for ( int i = 0; i < count; ++i )
{
cc2DLabel* label = labels[static_cast<unsigned int>( i )];
const cc2DLabel::PickedPoint& PP = label->getPickedPoint(0);
CCVector3 P = PP.getPointPosition();
CCVector3d Pd = CCVector3d::fromArray(P.u);

for(int j = 0 ; j < 5; ++j)
{
tablewidget->insertRow(i);
tablewidget->setItem(i, j, new QTableWidgetItem(QStringLiteral( "%1" ).arg( Pd.u[j], 0, 'f', 0 )));
}
}

I want to use it in my plug-in. But it fell apart.I marked the breakdown.

unsigned ccPointListPickingDlg::getPickedPoints(std::vector<cc2DLabel*>& pickedPoints)
{
pickedPoints.clear();

if (m_orderedLabelsContainer) // Do not enter if，The debug message crashes here.
{
//get all labels
ccHObject::Container labels;
unsigned count = m_orderedLabelsContainer->filterChildren(labels, false, CC_TYPES::LABEL_2D);

try
{
pickedPoints.reserve(count);
}
catch (const std::bad_alloc&)
{
ccLog::Error("Not enough memory!");
return 0;
}

for (unsigned i = 0; i < count; ++i)
{
if (labels->isA(CC_TYPES::LABEL_2D)) //Warning: cc2DViewportLabel is also a kind of 'CC_TYPES::LABEL_2D'!
{
cc2DLabel* label = static_cast<cc2DLabel*>(labels);

if (label->isVisible() && label->size() == 1)
{
pickedPoints.push_back(label);
}
}
}
}

return static_cast<unsigned>(pickedPoints.size());
}

Forgot to mention, I noticed that this function is protected members, and I moved it to public.

No, you should use the ccPickingHub instead: https://github.com/CloudCompare/CloudCo ... ckingHub.h

Thank you very much.

I did my job with these functions.

if (!m_app->pickingHub()) //no valid picking hub
{
m_app->dispToConsole("[ccCompass] Could not retrieve valid picking hub. Measurement aborted.", ccMainAppInterface::ERR_CONSOLE_MESSAGE);
}

if (!m_app->pickingHub()->addListener(this, true, true))
{
m_app->dispToConsole("Another tool is already using the picking mechanism. Stop it first", ccMainAppInterface::ERR_CONSOLE_MESSAGE);
}

onItemPicked（）

I did my job of getting coordinates in onitemoicked, but I ran into a problem.

When I adjust the scalar, click on my plug-in to select the mouse point function, an exception occurs, the point cloud color disappears! The scalar is still the one I set. When I set the scalar again, the scalar will not be abnormal again.

we would need a lot more context to help track down the exception, what your showing has a risk that it would try to use an invalid picking hub since your valid picking hub check doesn't bail out of the function early.

but beyond that, we need information.

Thank you for your answer, we solved this problem, and we found that on the first click, cc created a scalar called "octree_picking" for the point cloud.

That's only in debug mode.

When I use addListener(),vs does not recognize this external symbol at compile time. Do I need to add a library ?

This is a part of my cmakeList: And this is error: A sincere request!
Thanks!

Do you see the ccPickingHub source files in your plugin project? (and can you open the files?). Maybe the relative path is not right?