在上文中，我们创建了一个简单的CMakeLists.txt来管理Qt工程。这篇文章中，我们将根据上文的脚本文件写出管理Qt和VTK工程的CMakeLists.txt.

cmake_minimum_required(VERSION 3.5)

project(VTKImbuedQt LANGUAGES CXX)

set(CMAKE_INCLUDE_CURRENT_DIR ON)

set(CMAKE_AUTOUIC ON)
set(CMAKE_AUTOMOC ON)
set(CMAKE_AUTORCC ON)

set(CMAKE_CXX_STANDARD 11)
set(CMAKE_CXX_STANDARD_REQUIRED ON)


find_package(Qt5 COMPONENTS Widgets REQUIRED)
# new added
find_package(VTK REQUIRED)
  
add_executable(cmakeProject
    main.cpp
    mainwindow.cpp
    mainwindow.h
    mainwindow.ui
)

target_link_libraries(cmakeProject 
        PRIVATE 
            Qt5::Widgets
            # new added
            ${VTK_LIBRARIES}
)

我们可以看到相比之前我们只是添加了两行代码

find_package(VTK REQUIRED)

${VTK_LIBRARIES}

其实也就是用find_package命令来找到VTK所需要的头文件，以及将VTK的动态库链接到本案例中。结合上一篇文章中的讲解，此处应该不难理解。 （如何安装Qwt并将其集成到QtCreator/designer中？_jemnde的博客-CSDN博客）

我们将比对Qwt和VTKChartXY的画图比较，我们将左侧添加一个QFrame，其内部放置VTK的一个openGL控件（QVTKOpenGLNativeWidget）；右侧放置一个QWtPlot的控件（通过Qt Designer拖入，具体操作步骤请参考如何安装Qwt并将其集成到QtCreator/designer中？_jemnde的博客-CSDN博客）。如下图所示。

下面代码将给出如何将VTK显示窗口添加到界面中。我们首先创建一个QVTKOpenGLNativeWidget，然后我们将为其设置一个render window，再为此render window添加一个渲染器。

auto VTKOpenGLWidget = new QVTKOpenGLNativeWidget(this);
VTKOpenGLWidget->setMinimumSize(50, 100);
QLayout* layout = new QGridLayout();
layout->addWidget(VTKOpenGLWidget);
ui->frame->setLayout(layout);

//    setup scene window
vtkNew<vtkGenericOpenGLRenderWindow> window;
VTKOpenGLWidget->setRenderWindow(window.Get());
auto renderer = vtkSmartPointer<vtkRenderer>::New();
VTKOpenGLWidget->renderWindow()->AddRenderer(renderer);

 因为我们也引用了Qwt的控件，所以我们需要将Qwt的目录以及动态库在cmake里面显示声明一下。因为对于Qt和VTK我们使用了find_package()命令，其可以自动找到头文件的路径，因此不需要include_directories. If you want to link with a library without including the source of the library in a sub directory of your project, then you use find_package.

cmake_minimum_required(VERSION 3.5)

project(VTKImbuedQt LANGUAGES CXX)

set(CMAKE_INCLUDE_CURRENT_DIR ON)

set(CMAKE_AUTOUIC ON)
set(CMAKE_AUTOMOC ON)
set(CMAKE_AUTORCC ON)

set(CMAKE_CXX_STANDARD 11)
set(CMAKE_CXX_STANDARD_REQUIRED ON)

find_package(Qt5 COMPONENTS Core Widgets REQUIRED)
find_package(VTK REQUIRED)
include_directories(${CMAKE_CURRENT_BINARY_DIR})
include_directories(
        "/usr/local/qwt-6.2.0/include")

set(PROJECT_SRCS mainwindow.cpp)
set(PROJECT_HEADERS mainwindow.h)
set(PROJECT_UIS mainwindow.ui)

add_executable(cmakeProject
    main.cpp
    mainwindow.cpp
    mainwindow.h
    mainwindow.ui
)


target_link_libraries(cmakeProject PRIVATE
                        Qt5::Widgets
                        ${VTK_LIBRARIES}
                        "/usr/local/qwt-6.2.0/lib/libqwt.so"
                        )
# vtk_module_autoinit is needed
vtk_module_autoinit(
    TARGETS cmakeProject
    MODULES ${VTK_LIBRARIES}
    )

下面我们来看一下最终结果

 

 参考：

张晓东 罗火灵 《VTK图形图像开发进阶》

VTK官方例子

Qwt使用之QwtPlot_evense的专栏-CSDN博客_qwtplot使用QwtPlot是用来绘制二维图像的widget。在它的画板上可以无限制的显示绘画组件。绘画组件可以是曲线（QwtPlotCurve）、标记（QwtPlotMarker）、网格（QwtPlotGrid）、或者其它从QwtPlotItem继承的组件。 QwtPlot拥有4个axes（轴线）yLeft  Y axis left of the canvas.https://blog.csdn.net/evense/article/details/10087501

备注：Difference between (target_)link_libraries and (target_)include_directories

*include_directories is used to supply a list of include directories to the compiler. When a file is included using the pre-processor, these directories will be searched for the file.

*link_libraries is used to supply a list of libraries (object archives) to the linker. If the linked item is a cmake target, with specified include directories, they don't need to be specified separately with *include_directories.

The target_* versions apply only to the target that is given as an operand. The non-target versions apply to all targets in the directory. The target_* versions should be used whenever possible (i.e. pretty much always).

find_package is used to search for cmake settings from external sources i.e. outside of the project. If you want to link with a library without including the source of the library in a sub directory of your project, then you use find_package. From a lower level point of view, find_package(Foo) looks for a cmake module FindFoo.cmake and executes the module. The purpose of the module is to generate cmake variables or targets that can be used to include the corresponding dependency.

add_library is similar to add_executable, except it adds a target for a library, rather rather than an executable. Library targets can be used as items in link_libraries, and their dependencies are transitive by default.