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84 lines
3.7 KiB
Markdown
84 lines
3.7 KiB
Markdown
# Example (JKQTPlotter): CMake Example {#JKQTCMakeLinkExample}
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This project (see [`cmake_link_example`](https://github.com/jkriege2/JKQtPlotter/tree/master/examples/cmake_link_example) demonstrates how to link against JKQTPlotter using CMake. See https://jkriege2.github.io/JKQtPlotter/page_buildinstructions__c_m_a_k_e.html for details on how to build JKQTPlotter with CMake
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This example uses very simple code, which simply displays a plotter and shows some data. The important part of this example is the ´CMakeLists.txt`-file:
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```
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# set minimum required CMake-Version
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cmake_minimum_required(VERSION 3.23)
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# set Project name
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project(simpletest_cmake LANGUAGES CXX)
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# some basic configurations
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set(CMAKE_AUTOMOC ON)
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set(CMAKE_INCLUDE_CURRENT_DIR ON)
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# Configure project for usage of Qt5/Qt6
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find_package(QT NAMES Qt6 Qt5 COMPONENTS Core Gui Widgets PrintSupport Svg Xml OpenGl REQUIRED)
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find_package(Qt${QT_VERSION_MAJOR} COMPONENTS Core Gui Widgets PrintSupport Svg Xml OpenGL REQUIRED)
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# include JKQTPlotter
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find_package(JKQTPlotter${QT_VERSION_MAJOR} REQUIRED)
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# For Visual Studio, we need to set some additional compiler options
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if(MSVC)
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add_compile_options(/EHsc)
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# To enable M_PI, M_E,...
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add_definitions(/D_USE_MATH_DEFINES)
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# To Prevent Errors with min() and max()
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add_definitions(/DNOMINMAX)
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# To fix error: C2338: va_start argument must not
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# have reference type and must not be parenthesized
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add_definitions(/D_CRT_NO_VA_START_VALIDATION)
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endif()
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# add the example executable
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add_executable(${PROJECT_NAME} WIN32 simpletest.cpp)
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# ... link against Qt5/6 and JKQTPlotterLib
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# (you could use JKQTPlotterSharedLib if you don't want to link againast the
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# static version, but against the shared/DLL version).
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target_link_libraries(${PROJECT_NAME} Qt${QT_VERSION_MAJOR}::Core Qt${QT_VERSION_MAJOR}::Widgets Qt${QT_VERSION_MAJOR}::Gui Qt${QT_VERSION_MAJOR}::PrintSupport Qt${QT_VERSION_MAJOR}::Svg Qt${QT_VERSION_MAJOR}::Xml)
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# ... link against JKQTPlotter: As the Targets contain the Qt-Version-Number in their names, we can
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# link against 'JKQTPlotter${QT_VERSION_MAJOR}::JKQTPlotter${QT_VERSION_MAJOR}' and it works
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# for Qt5 AND Qt6 ...
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# if you have a speific Qt-Version, you can also write e.g. 'JKQTPlotter6::JKQTPlotter6'
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target_link_libraries(${PROJECT_NAME} JKQTPlotter${QT_VERSION_MAJOR}::JKQTPlotter${QT_VERSION_MAJOR})
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# Installation
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install(TARGETS ${PROJECT_NAME} RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
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```
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The important steps here are
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```
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# find JKQTPlotter
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find_package(JKQTPlotter${QT_VERSION_MAJOR} REQUIRED)
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# ...
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# link against JKQtPlotter:
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target_link_libraries(${EXENAME} JKQTPlotter${QT_VERSION_MAJOR}::JKQTPlotter${QT_VERSION_MAJOR})
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```
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We are using `${QT_VERSION_MAJOR}` here, as this file is supposed to work with both Qt5 AND Qt6. If you only use say Qt6, you can also write:
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```
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find_package(JKQTPlotter6 REQUIRED)
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target_link_libraries(${EXENAME} JKQTPlotter6::JKQTPlotter6)
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```
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To build this example, you first need to make a subdirectory `build` and then call CMake form that subdirectory:
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```.sh
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$ mkdir build
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$ cd build
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$ cmake .. -G "<GENERATOR>" "-DCMAKE_PREFIX_PATH=<path_to_your_qt_sources>;<path_to_JKQTPlotter_installdir>"
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```
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The you can use the generated makefiles (e.g. load them in an editor, or build them jsing `make`). In the last line above, you need to specify two directories:
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- `<path_to_your_qt_sources>` points to you Qt installation
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- `<path_to_JKQTPlotter_installdir>` points to the directory containing the JKQTPlotter build. Typically this is will conatin a subdirectory`<JKQTPLOTTER_INSTALL_DIR>/lib/cmake/JKQtPlottr6` with all necessary CMake-scripts. Here `<JKQTPLOTTER_INSTALL_DIR>` is the directory into which you installed JKQTPlotter.
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