SFML C++ not rendering
SFML C++ not rendering
我遇到了一个问题,我正在写一个小游戏,有几次当我添加新变量(如float或sf::Vector2f)时,sfml没有渲染其他元素或没有移动(或其他奇怪的问题)。
这是我的主要功能:
const int resW=800, resH=600;
sf::RenderWindow app(sf::VideoMode(resW, resH), "Jump");//, sf::Style::Fullscreen);
int main()
{
//FPS
app.setFramerateLimit(60);
sf::Font font;
float jumpStrength = 0.0;
//when i uncomment it, my player is not rendered.
//When it's commented everything is rendered
//some time ago I had declared float number in player class,
//and then player couldn't move (problem with sfml setPosition()???
//sf::RectangleShape strengthRect(sf::Vector2f(100,100));
while (app.isOpen())
{
// Process events
sf::Event event;
while (app.pollEvent(event))
{
// Close window : exit
if (event.type == sf::Event::Closed ||
sf::Keyboard::isKeyPressed(sf::Keyboard::Escape))
{
app.close();
}
if(sf::Keyboard::isKeyPressed(sf::Keyboard::Space))
{
jumpStrength+=0.2;
}
else if(jumpStrength>0.0)
{
player.Jump(jumpStrength);
}
}
// Clear screen
app.clear();
ChandleInput();
ChandleCollisions();
player.Update();
player.Draw(&app);
app.draw(strengthRect);
}
}
class CPlayer
{
private:
sf::Texture playerTex[3];
sf::Sprite player;
float g;
float height;
float jumpVel;
void ResetJump() {jumpVel = 11;
g = 0.2;
height = 0;}
void Move(float x, float y)
{
sf::Vector2f vec = player.getPosition();
vec.x += x;
vec.y += y;
player.setPosition(vec.x,vec.y);
}
public:
CPlayer()
{
if (!playerTex[0].loadFromFile("Images/frame_1.png"))
return;// EXIT_FAILURE;
if (!playerTex[1].loadFromFile("Images/frame_2.png"))
return;// EXIT_FAILURE;
if (!playerTex[2].loadFromFile("Images/frame_3.png"))
return;// EXIT_FAILURE;
player.setTexture(playerTex[0]);
int x,y;
int w,h;
w = player.getLocalBounds().width;
h = player.getLocalBounds().height;
x = resW/2;y=resH-h/2;
x-=w/2;
y-=h/2;
player.setPosition(x,y);
}
int GetX(){return player.getPosition().x;}
int GetY(){return player.getPosition().y;}
float GetHeight(){return height;}
void Update()
{
if(height>0)//skacze
{
jumpVel -= g;
height += jumpVel;
}
else
{
if(height<0)
{
height = 0;
}
if(jumped)
{
landed = true;
player.setTexture(playerTex[0]);
}
//Move(0,-1);
}
}
void Jump(float strength)
{
if(!jumped)
if(height<=0)//nie skacze
{
ResetJump();
height = jumpVel;
jumped = true;
player.setTexture(playerTex[1]);
jumpVel = strength;
}
}
void Draw(sf::RenderWindow *app)
{
Move(0.0,-height);
app->draw(player);
Move(0.0,height);
}
};
编辑
我注意到当我(在我的球员课堂上)打电话时player.setPosition(…);播放器未渲染。当我不调用它时,它会被渲染。另一方面,当我不声明RectangleShape时,玩家会被正确地移动和渲染。
编辑2类CPlayer中是Move()方法,其中是setPosition()。
当出现这种错误/小故障时,游戏的行为会根据变量或数组中项目的数量而变化,这很可能是由于变量未正确初始化造成的。
为所有类中的所有属性在其所有构造函数中指定一个值。
在您的情况下,g、height和jumpVel未初始化。在构造函数中给它们一个默认值,并检查其他类的属性是否在构造函数中初始化。
不幸的是,当你有一个窗口上下文时,你必须在main()中定义它
所以
int main()
{
sf::RenderWindow window(sf::VideoMode(800, 600), "MY GAME WINDOW");
}
而不是
sf::RenderWindow window(sf::VideoMode(800, 600), "MY GAME WINDOW");
int main()
{
//window stuff...
}
如果你想要多线程,你必须查看线程文档,但你可以做
void Thread(sf::RenderWindow &window)
{
// Draw stuff...
}
int main()
{
sf::RenderWindow window(sf::VideoMode(800, 600), "MY GAME WINDOW");
sf::Thread exampleThread(Thread, window);
window.setActive(false);
while (window.isOpen()) { /* preferably do events here still
something I struggle with */ }
}
但是文档对于sfml来说还是很棒的。
相关文章:
- OpenMP卸载说'fatal error: could not find accel/nvptx-none/mkoffload'
- 使用JsonCpp将数据返回到带有pybind11的python会在python调用中产生Symbol not foun
- OpenCV Android C++ imwrite not found
- 应用程序崩溃并显示"symbol _ZdlPvm, version Qt_5 not defined in file libQt5Core.so.5 with link time reference"
- 使用单词"not"作为C ++类的名称会导致VS2019错误
- 错误"Could not find Boost"(缺少:上下文标头)
- 如何修复"error: ‘_1’ was not declared in this scope"?
- 套接字连接"Operation not permitted"错误,甚至使用升压/平发器根.cpp
- Is !NaN not a NaN?
- 为什么我会" void value not ignored as it ought to be"?
- 解决"ld: library not found for -ltensorflow_framework.2.3.0"
- 加载与引用 .NET DLL 位于同一文件夹中的引用的 .NET DLL 时"Not found"异常
- Directx 11 - CompileFromFile() is not compiling
- 方法错误"not all control paths return a value"和方法不返回值
- Centos7 g++ "to_string is not in a member of std"
- 将系数存储在头文件的数组中("does not name a type"错误)
- c++ cuda opengl not rendering vbo
- cocos2dx c++ android Not rendering a MenuItemImage
- SFML C++ not rendering
- Cocos2d-x 3.8 - RenderTexture ,OpenGL not rendering