Qt：即使包含“Q3DScatter”也无法识别

Question

我想在我的主窗口中显示一个 3DScatter 图。

在我的 mainwindow.h 中，我包含了 #include <Q3DScatter>，但是当在 MainWindow 类的 public: 部分输入 3DScatter scatterGraph; 时，我收到以下错误消息：

error: unknown type name 'Q3DScatter'

这是我已经检查过的内容：

• Qt 维护工具中已经安装了“Qt 数据可视化”模块
• #include <Q3DScatter> 没有错误
• 当转到 Tools -> Locate 并输入“Q3DScatter”时，它会同时找到 Q3DScatter 和 q3dscatter.h
• 在q3dscatter.h 中存在名为Q3DScatterPrivate 和Q3DScatter 的类
• 在.pro 文件的第一行是QT += core gui datavisualization

我做错了什么？该模块似乎存在，但为什么我不能创建Q3DScatter scatterGraph？

编辑： 这是来自编译输出的完整错误消息：

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

快速查看标题表明Q3DScatter 在命名空间QtDataVisualization 下声明。既然如此，你就需要使用...

QtDataVisualization::Q3DScatter scatterGraph;