SFML 精灵加载为白色方块

编程问答 2022-05-25

问题描述

我试图每隔固定的秒数创建一个 Sprite， 问题是精灵呈现为白色方块。

PowerUp.h

#pragma once

#include <SFML/Graphics.hpp>
#include <stdlib.h>
#include "Utility.h"

class PowerUp
{
public:
    PowerUp(sf::Vector2f position,PowerUpType powerUpType);
    void draw(sf::RenderWindow& window);
private:

    sf::Image image;
    sf::Texture texture;
    sf::Sprite sprite;
    sf::Vector2f position;

    float radius;
    float delay;
    
    PowerUpType type;

    sf::Clock timer;
};

PowerUp.cpp

#include "PowerUp.h"

PowerUp::PowerUp(sf::Vector2f position,PowerUpType type) {
    this->position = position;
    this->type = type;
    this->image.loadFromFile("Images/img1.png");
    this->sprite.setorigin(sf::Vector2f(2 * radius,2 * radius));
    this->sprite.setPosition(position);
    this->texture.loadFromImage(this->image);
    this->sprite.setTexture(this->texture);
    
    radius = 25;
    delay = 5;
    sprite.setScale(0.5f,0.5f);
}
void PowerUp::draw(sf::RenderWindow &window) {
    window.draw(this->sprite);
}

Board.h

#pragma once

#include <SFML/Graphics.hpp>
#include <stdlib.h>
#include "Utility.h"
#include "PowerUp.h"

class Board {

public:
    Board(int width,int height);
    void updatePowerUp();
    void draw(sf::RenderWindow& window);
private:
    sf::Vector2f size;
    sf::Vector2f offset;
    sf::RectangleShape background;

    sf::Clock timer;

    std::vector<PowerUp> powerUps;

    float nextPowerUp;
};

PowerUp.cpp

#include "Board.h"

Board::Board(int width,int height) {
    size = sf::Vector2f(width,height);
    offset = sf::Vector2f(5,5);
    background.setoutlineColor(sf::Color::White);
    background.setSize(size - 2.f * offset);
    background.setoutlineThickness(offset.x);
    background.setFillColor(sf::Color::Transparent);
    background.setPosition(offset);
    nextPowerUp = 1.f;
}

void Board::updatePowerUp() {
    if (timer.getelapsedtime().asSeconds() > 1) {
        PowerUp p(sf::Vector2f(randFloat(size.x - 40),randFloat(size.y - 40)),PowerUpType::CLEAN_BOARD);
        powerUps.push_back(p);
        nextPowerUp = 5 + randFloat(6);
        timer.restart();
    }
}

void Board::draw(sf::RenderWindow &window) {
    window.draw(background);
    for (PowerUp pu : powerUps) {
        pu.draw(window);
    }
}

ma​​in.cpp

#include <SFML/Graphics.hpp>
#include <stdlib.h>
#include "Utility.h"
#include "Board.h"

using namespace std;

int main()
{
    const int height = 800;
    const int width = 800;

    sf::ContextSettings windowSettings;
    windowSettings.antialiasingLevel = 16;

    sf::RenderWindow window(sf::VideoMode(height,width),"CurveFever",sf::Style::Default,windowSettings);
    Board myBoard = Board(width,height);
    myBoard.setColor(sf::Color::Green);

    sf::Clock deltaTime;

    while (window.isopen()) {
        myBoard.updatePowerUp();
        window.clear();
        myBoard.draw(window);
        window.display();
        sf::Event ev;
        while (window.pollEvent(ev)) {
            if (ev.type == sf::Event::Closed)
                window.close();
        }
    }

    return 0;
}

我发现如果我在 PowerUp.cpp 中重复 this->image.loadFromFile("Images/img1.png") 两次，只有第一个精灵不会显示为白色方块。 我知道这个问题通常会发生，因为没有对纹理的引用，但只要 PowerUp 对象存在，纹理就应该存在。

解决方法

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c++sfmlspritespritespritespritetextures