Qt：即使包含“Q3DScatter”也无法识别

Question

I want to show a 3DScatter graph in my main window.

In my mainwindow.h i have included #include <Q3DScatter> but when entering 3DScatter scatterGraph; in the public: section of the MainWindow class i get this error message:

error: unknown type name 'Q3DScatter'

Here is what I've already checked:

• In the Qt Maintenance Tool the 'Qt Data Visualization' module is already installed
• There are no errors for #include <Q3DScatter>
• When going to Tools -> Locate and entering 'Q3DScatter' it finds both Q3DScatter and q3dscatter.h
• In q3dscatter.h exists classes named Q3DScatterPrivate and Q3DScatter
• In the .pro file the first line is QT += core gui datavisualization

What am I doing wrong? The module seems to exist but why can't I create the Q3DScatter scatterGraph ?

EDIT: This is the entire error message from the Compile Output:

In file included from ../MandelbulbUI/main.cpp:1:0:
../MandelbulbUI/mainwindow.h:26:5: error: ‘Q3DScatter’ does not name a type; did you mean ‘QDate’?
     Q3DScatter scatterGraph;
     ^~~~~~~~~~
     QDate
In file included from ../MandelbulbUI/mainwindow.cpp:1:0:
../MandelbulbUI/mainwindow.h:26:5: error: ‘Q3DScatter’ does not name a type; did you mean ‘QDate’?
     Q3DScatter scatterGraph;
     ^~~~~~~~~~
     QDate
In file included from moc_mainwindow.cpp:9:0:
../MandelbulbUI/mainwindow.h:26:5: error: ‘Q3DScatter’ does not name a type; did you mean ‘QDate’?
     Q3DScatter scatterGraph;
     ^~~~~~~~~~
     QDate
Makefile:1598: recipe for target 'main.o' failed
make: *** [main.o] Error 1
make: *** Waiting for unfinished jobs....
Makefile:1817: recipe for target 'moc_mainwindow.o' failed
make: *** [moc_mainwindow.o] Error 1
Makefile:1805: recipe for target 'mainwindow.o' failed
make: *** [mainwindow.o] Error 1
17:30:54: The process "/usr/bin/make" exited with code 2.
Error while building/deploying project MandelbulbUI (kit: Desktop Qt 5.12.7 GCC 64bit)
When executing step "Make"

Answer 1

A quick look at the headers suggests that Q3DScatter is declared under the namespace QtDataVisualization . That being the case you need to use...

QtDataVisualization::Q3DScatter scatterGraph;