如何处理 Qapplication error, ui_ImageInterface error 等错误, 如何调试cgal 和Qt5程序呢?

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花了很多时间,终于调试好了一个使用qt的cgal程序.

主文件main.cpp代码如下

#include <QApplication>
#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
#include <CGAL/Triangulation_2.h>
#include <CGAL/draw_triangulation_2.h>
#include <iostream>
#include <vector>
typedef CGAL::Exact_predicates_inexact_constructions_kernel K;
typedef CGAL::Triangulation_2<K>      Triangulation;
typedef Triangulation::Vertex_handle  Vertex_handle;
typedef Triangulation::Point          Point;
typedef Triangulation::Finite_vertex_handles    Finite_vertex_handles;
// The following types are different
// Its value type is Triangulation_2::Vertex
typedef Triangulation::Finite_vertices_iterator Finite_vertices_iterator;
// Its value type is Triangulation_2::Vertex_handle
typedef Finite_vertex_handles::iterator         Finite_vertex_handles_iterator;
int main()
{
    std::vector<Point> points =  { Point(0,0), Point(1,0), Point(0,1),Point(1,1),Point(0.5,0.5) };
    Triangulation T;
    T.insert(points.begin(), points.end());
    std::cout << "Triangulation_2::Finite_vertices_iterator is like a  Triangulation_2::Vertex_handle\n";
    for(Finite_vertices_iterator it = T.finite_vertices_begin();
        it != T.finite_vertices_end();
        ++it){
        std::cout << it->point() << std::endl;
    }
    std::cout << "Triangulation_2::Finite_vertex_handles::iterator dereferences to Triangulation_2::Vertex_handle\n";
    Finite_vertex_handles::iterator b, e;
    std::tie(b,e) = T.finite_vertex_handles();
    for(; b!=e; ++b){
        Vertex_handle vh = *b; // you must dereference the iterator to get a handle
        std::cout << vh->point() << std::endl;
    }
    std::cout << "and you can use a C++11 for loop\n";
    for(Vertex_handle vh : T.finite_vertex_handles())
    {
        std::cout << vh->point() << std::endl;
    }

    CGAL::draw(T);
    return 0;
}

需要的CMakeLists.txt文件如下

# Created by the script cgal_create_CMakeLists
# This is the CMake script for compiling a set of CGAL applications.

cmake_minimum_required(VERSION 3.1...3.15)

project( ex8 )


# CGAL and its components
find_package(CGAL COMPONENTS Qt5)

if(CGAL_Qt5_FOUND)
  add_definitions(-DCGAL_USE_BASIC_VIEWER -DQT_NO_KEYWORDS)
endif()


if ( NOT CGAL_FOUND )

  message(STATUS "This project requires the CGAL library, and will not be compiled.")
  return()

endif()


# Boost and its components
find_package( Boost REQUIRED )

if ( NOT Boost_FOUND )

  message(STATUS "This project requires the Boost library, and will not be compiled.")

  return()

endif()

# include for local directory

# include for local package


# Creating entries for all C++ files with "main" routine
# ##########################################################


create_single_source_cgal_program( "main.cpp" )

 将上述两个文件存入文件夹ex8. 依次执行下面的命令, 编译运行.

1. 运行cmake-gui

2. make中间出错

3. 解决办法是删掉CMakeFiles文件夹里面的内容

4. 然后重新make

5. 最后可以顺利运行,可以得到想要的窗口

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