SFML VertexArray不是sf的成员

Question

我有以下用顶点数组绘制三角形的程序，如SFML教程中所述。

#include <SFML/Graphics.hpp> 
#include <iostream> 

int main() 
{ 
    try{ 
     sf::RenderWindow Mywindow(sf::VideoMode(800,600),"TriColor Triangle!"); 


     sf::VertexArray triangle(sf::Triangles, 3); 

     triangle[0].position = sf::Vector2f(5,5); 
     triangle[1].position = sf::Vector2f(50,5); 
     triangle[2].position = sf::Vector2f(50,50); 

     triangle[0].color = sf::Color::Red; 
     triangle[1].color = sf::Color::Blue; 
     triangle[2].color = sf::Color::Green; 

     Mywindow.draw(triangle); 
    } 
    catch(const std::runtime_error& e) 
    { 
     std::cout << e.what() << std::endl; 
     std::cin.ignore(); 
     return EXIT_FAILURE; 
    } 

    std::cin.ignore(); 
    return EXIT_SUCCESS; 
} 

的makefile我使用编译如下：

all: exe 

exe: main.o 
     g++ main.o -o exe -lsfml-graphics -lsfml-window -lsfml-system 

main.o: main.cpp 
     g++ -c main.cpp 

正在显示follwing错误：

make 
g++ -c main.cpp 
main.cpp: In function ‘int main()’: 
main.cpp:11:2: error: ‘VertexArray’ is not a member of ‘sf’ 
main.cpp:11:18: error: expected ‘;’ before ‘triangle’ 
main.cpp:13:2: error: ‘triangle’ was not declared in this scope 
main.cpp:21:11: error: ‘class sf::RenderWindow’ has no member named ‘draw’ 
main.cpp:23:33: error: expected unqualified-id before ‘&’ token 
main.cpp:23:33: error: expected ‘)’ before ‘&’ token 
main.cpp:23:33: error: expected ‘{’ before ‘&’ token 
main.cpp:23:35: error: ‘e’ was not declared in this scope 
main.cpp:23:36: error: expected ‘;’ before ‘)’ token 
make: *** [main.o] Error 1 

我不明白为什么跟它VertexArray不sf的成员！

Answer 1

您必须提供SFML库目录的路径和SFML包含目录的路径。

像这样：

"-IC:\\Path\\to\\your\\project\\your-lib-sub-dir\\SFML-2.1\\include" 
"-LC:\\Path\\to\\your\\project\\your-lib-sub-dir\\SFML-2.1\\lib" 

另一件事，要能够看到的东西，你应该是这样的suround您绘制调用：

while(1){ 
    Mywindow.clear(sf::Color::Black); 
    Mywindow.draw(triangle); 
    Mywindow.display(); 
}