我的sfml纹理在哪里超出了范围

所以我（再次）遇到了臭名昭著的白色方块问题，这次我尽可能返回引用，但没有用。我有一个Level，它保存一个向量GamePieces，而每个GamePiece对象都保存一个sf::sprite。以下是尝试从GamePiece:绘制精灵的代码

引擎.h:

#pragma once
#include "stdafx.h"
#include "SFML/Graphics.hpp"
#include "ImageManager.h"
#include "Level.h"
#include "GamePiece.h"
class Engine{
public:
    Engine();
    ~Engine();
    void Go();
private:
    void ProcessInput();
    void UpdateCPU();
    void Render();
    sf::RenderWindow window;
    ImageManager imgr;
    Level level;
};

绘制的引擎功能：

void Engine::Render(){
    window.clear();
    //draw wall tiles
    for(int i = 0; i < 160; i++){
        if(i < 60){
            level.GetWallTile().setPosition(0, i * 10);
            window.draw(level.GetWallTile());
        }
        if(i >= 60 && i < 100){
            level.GetWallTile().setPosition((i - 60) * 10, 590);
            window.draw(level.GetWallTile());
        }
        if(i >= 100){
            level.GetWallTile().setPosition(390, (i - 100) * 10);
            window.draw(level.GetWallTile());
        }
    }
    //draw BG tiles
    for(int i = 1; i < 39; i++){
        for(int j = 0; j < 59; j++){
            level.GetBGTile().setPosition(i * 10, j * 10);
            window.draw(level.GetBGTile());
        }
    }
    for(int i = 0; i < level.GetGamePieces().size(); i++){
        window.draw(level.GetGamePieces()[i].GetPieceSprite());
    }
    window.display();
}

请记住，wallTile和bgTile的画得很好，是最后一个循环给了我白色的方块。

以下是相关的函数和类：

//level.h
#pragma once
#include "stdafx.h"
#include "SFML/Graphics.hpp"
#include "ImageManager.h"
#include "GamePiece.h"
class Level{
public:
    Level(ImageManager &im);
    ~Level();
    sf::Sprite &GetWallTile();
    sf::Sprite &GetBGTile();
    void AddPiece();
    std::vector<GamePiece> &GetGamePieces();
private:
    ImageManager &imgr;
    //not sure if vector needed, or one sprite
    //std::vector<sf::Sprite> wallTiles_;
    sf::Sprite wallTile;
    //std::vector<sf::Sprite> bgTiles_;
    sf::Sprite bgTile;
    std::vector<GamePiece> gamePieces_;
};
//Level.cpp
#include "stdafx.h"
#include "Level.h"
Level::Level(ImageManager &im) : imgr(im){
    im.AddResourceDirectory("images/");
    wallTile.setTexture(im.GetImage("walltile1.png"));
    bgTile.setTexture(im.GetImage("bgtile1.png"));
    AddPiece();
}
Level::~Level(){
}
void Level::AddPiece(){
    GamePiece piece(imgr);
    gamePieces_.push_back(piece);
}
std::vector<GamePiece> &Level::GetGamePieces(){
    return gamePieces_;
}
//GamPiece.h
class GamePiece{
public:
    GamePiece(ImageManager &im);
    ~GamePiece();
    void SetShape();
    sf::Sprite &GetPieceSprite();
private:
    ImageManager &imgr;
    sf::Sprite pieceShape;
};
//and GamePiece.cpp
#include "stdafx.h"
#include "GamePiece.h"
GamePiece::GamePiece(ImageManager &im) : imgr(im){
    SetShape(); 
}
GamePiece::~GamePiece(){
}
void GamePiece::SetShape(){
    //int temp = rand() % 7;
    int temp = 0;
    switch(temp){
    case 0:
        pieceShape.setTexture(imgr.GetImage("line.png"));
    case 1:
        pieceShape.setTexture(imgr.GetImage("llblock.png"));
    case 2:
        pieceShape.setTexture(imgr.GetImage("rlblock.png"));
    case 3:
        pieceShape.setTexture(imgr.GetImage("square.png"));
    case 4:
        pieceShape.setTexture(imgr.GetImage("lsquiggly.png"));
    case 5:
        pieceShape.setTexture(imgr.GetImage("rsquiggly.png"));
    case 6:
        pieceShape.setTexture(imgr.GetImage("tblock.png"));
    }
}
sf::Sprite &GamePiece::GetPieceSprite(){
    return pieceShape;
}

我知道很多代码，但我真的不知道纹理在哪里超出了范围，假设这就是问题所在。看看类似的帖子，这可能是问题所在，但我需要帮助找到它。