SDL_ttf紋理矢量影響其他的目標矩形

Question

我下面的懶惰富」教程使用TTF字體來創建文本，一切都很好，但我需要建立在幾個不同的地方用不同的字體大小和顏色的幾個文本行，所以我決定使用矢量。這裏是我的TextTexture的代碼（主要是懶富教程的複製）：

#ifndef TEXT_TEXTURE_HPP 
#define TEXT_TEXTURE_HPP 

#include "graphics.hpp" 
#include "vector2.hpp" 

#include <SDL2/SDL_ttf.h> 

#include <string> 

class TextTexture { 
public: 
    TextTexture(
     Graphics& graphics, 
     TTF_Font* font, 
     std::string textureText, 
     SDL_Color textColor, 
     Vector2 coordinates 
    ); 

    ~TextTexture(); 

    void draw(Graphics& graphics); 

private: 
    SDL_Texture* mTexture; 

    int mWidth; 
    int mHeight; 

    int mX; 
    int mY; 

}; 

#endif // TEXT_TEXTURE_HPP 

和.cpp文件吧：

#include "text_texture.hpp" 
#include "vector2.hpp" 

#include <iostream> 
#include <unistd.h> 

TextTexture::TextTexture (
    Graphics& graphics, 
    TTF_Font* font, 
    std::string textureText, 
    SDL_Color textColor, 
    Vector2 coordinates 
) : 
    mTexture(NULL), 
    mWidth(0), 
    mHeight(0), 
    mX(0), 
    mY(0) 
{ 
    //Render temp surface 
    SDL_Surface* tempSurface = TTF_RenderUTF8_Blended (font, textureText.c_str(), textColor); 

    if (tempSurface == NULL) { 
     std::cout << "Unable to render text surface! SDL_ttf Error: " << TTF_GetError() << std::endl; 
    } else { 
     this -> mTexture = SDL_CreateTextureFromSurface(graphics.getRenderer(), tempSurface); 
     if (this -> mTexture == NULL) { 
      std::cout << "Unable to create texture from rendered text! SDL Error: " << SDL_GetError() << std::endl; 
     } else { 
      //Get image dimensions 
      mWidth = tempSurface -> w; 
      mHeight = tempSurface -> h; 
      // Get coordinates 
      this -> mX = coordinates.getX(); 
      this -> mY = coordinates.getY(); 
     } 
     SDL_FreeSurface (tempSurface); 
     tempSurface = NULL; 
    } 
} 

TextTexture::~TextTexture() { 
    //Free texture if it exists 
    if (mTexture != NULL) { 
     SDL_DestroyTexture(mTexture); 
    } 
    mTexture = NULL; 
    mWidth = 0; 
    mHeight = 0; 
} 

// FIXME somewhy affects previous dest rects 
void TextTexture::draw (Graphics& graphics) { 
    //Set rendering space and render to screen 
    SDL_Rect destinationRectangle = { mX, mY, this -> mWidth, this -> mHeight }; 
    //Render to screen 
    graphics.blitSurface(mTexture, NULL, &destinationRectangle); 
} 

我創建簡單的文本管理器來處理文本的向量：

#ifndef TEXT_MANAGER_HPP 
#define TEXT_MANAGER_HPP 

#include "graphics.hpp" 
#include "text_texture.hpp" 
#include "vector2.hpp" 

#include <string> 
#include <vector> 

enum fontSize { 
    SMALL = 16, 
    NORMAL = 32, 
    BIG = 48, 
    TITLE = 72 
}; 

enum fontColor { 
    WHITE, 
    ORANGE, 
    BLACK 
}; 

class TextManager { 
public: 
    TextManager(Graphics& graphics); 
    ~TextManager(); 

    void addText(std::string, fontSize, fontColor, Vector2); 
    void draw(); 
    void clearText(); 

private: 
    Graphics& graphics; 
    std::vector <TextTexture> gText; 
}; 

#endif // TEXT_MANAGER_HPP 

和.cpp文件：

#include "text_manager.hpp" 

#include <iostream> 

TextManager::TextManager(Graphics& graphics) : 
    graphics(graphics) 
{} 

TextManager::~TextManager() {} 

void TextManager::addText(std::string text, fontSize size, fontColor color, Vector2 coordinates) { 

    TTF_Font* tempFont = TTF_OpenFont("resources/fonts/pixel.ttf", fontSize::TITLE); 
    SDL_Color tempColor = { 255, 255, 255 }; 

    // Switch removed for shorter code 

    this -> gText.emplace_back(graphics, tempFont, text, tempColor, coordinates); 

    TTF_CloseFont(tempFont); 
    tempFont = NULL; 
} 
// FIXME 
void TextManager::draw() { 
    std::vector<TextTexture>::iterator it; 
    for(it = gText.begin(); it != gText.end(); ++it) { 
     it -> draw(graphics); 
    } 

} 

void TextManager::clearText() { 
    gText.clear(); 
} 

但是，當我啓動應用程序，我看到類似這樣的：添加文字的第二行按下一個按鈕後，當只有一個行文字，一切

Second string is printed, but font and bonding rectangle of first line is saved, hovewer

後來我加了輸入處理程序很好，但是當你添加第二個時，開始有些奇怪 - 有時候第一個文本會消失，有時候他們兩個都會被推開。據我所知，文本的第二面不知何故會影響第一面，通過在第一面的位置複製紋理。

這裏是我的graphics.blitSurface，它是否會有所幫助：

void Graphics::blitSurface(SDL_Texture* texture, SDL_Rect* sourceRectangle, SDL_Rect* destinationRectangle) 
{ 
    SDL_RenderCopy (this -> _renderer, texture, sourceRectangle, destinationRectangle); 
} 

哪裏是我的錯？對不起英語不好，我希望你會得到我的問題。

Answer 1

我以某種方式隨機地想出了它。事情是，當我添加對象向量時，它調用析構函數。

這是爲什麼：

Why does my class's destructor get called when I add instances to a vector?