Question

我是SFML和C ++的新手。我正在为学校项目建立康威的生活游戏。

作为我的网格的基础对象，我有正方形（基数为sf::RectangleShape）。网格是std::vector<std::vector<Square>>（正方形向量的向量）。

我现在要做的是当我用光标悬停在方格上时改变方块的颜色。我这样做的方式（见下面的代码）：

移动时我得到光标的位置
我遍历我的矩阵并检查每个方格是否光标的位置在方形边界内。
当找到光标下的方块时，我想更改其颜色（.setFillColor(...)）。

第3点不起作用我无法理解原因。这是函数＆＃34; mouseHover＆＃34;在下面的代码中。 你能看出出了什么问题吗？

int main()
{
    int width;
    int height;
    int numberSquareWidth = 15;
    int numberSquareHeight = 15;
    int squareSize = 20;
    int offset = 1;
    initializeWindowGridValues(width, height, numberSquareWidth, numberSquareHeight, squareSize, offset);

    sf::RenderWindow window(sf::VideoMode(width, height), "Stephan's Game Of Life!");
    std::vector<std::vector<Square>> matrix(numberSquareWidth, std::vector<Square>(numberSquareHeight));
    initiatlizeGrid(numberSquareWidth, numberSquareHeight, squareSize, offset, matrix);

    sf::Vector2i cursorPos;
    while (window.isOpen())
    {
        sf::Event event;
        while (window.pollEvent(event))
        {
            if (event.type == sf::Event::Closed)
                window.close();

            if (event.type == sf::Event::MouseMoved)
            {
                cursorPos = sf::Mouse::getPosition(window);
            }
        }
        mouseHover(matrix, cursorPos, squareSize, offset); // Problem here

        window.clear(sf::Color::Black);
        drawGrid(window, matrix);
        window.display();
    }
    return 0;
}

void mouseHover(std::vector<std::vector<Square>> &matrix, const sf::Vector2i &cursorPos, const int &squareSize, const int &offset)
{
    int rowIndex = floor((cursorPos.x - (offset * floor(cursorPos.x / squareSize))) / squareSize);
    int colIndex = floor((cursorPos.y - (offset * floor(cursorPos.y / squareSize))) / squareSize);
    matrix[rowIndex][colIndex].setFillColor(sf::Color::Blue); // This does not happen.
}

void drawGrid(sf::RenderWindow &window, const std::vector<std::vector<Square>> &matrix)
{
    for (const auto &vector : matrix)
    {
        for (const auto &square : vector)
        {
            window.draw(square);
        }
    }
}

void initiatlizeGrid(const int &numberSquareWidth, const int &numberSquareHeight, const int &squareSize, const int &offset, std::vector<std::vector<Square>> &matrix)
{
    int previousY = 0;
    for (size_t row = 0; row < numberSquareWidth; row++)
    {
        int offsetv;
        if (row == 0)
        {
            offsetv = 0;
        }
        else
        {
            offsetv = offset;
        }
        int previousX = 0;
        for (size_t col = 0; col < numberSquareHeight; col++)
        {
            int offseth;
            if (col == 0)
            {
                offseth = 0;
            }
            else
            {
                offseth = offset;
            }
            Square square(squareSize);
            square.setPosition(previousX + offseth, previousY + offsetv);
            matrix[row][col] = square;
            previousX = previousX + squareSize + offseth;
        }
        previousY = previousY + squareSize + offsetv;
    }
}

void initializeWindowGridValues(int &width, int &height, int &nuberSquareWidth, int &nuberSquareHeight, int &squareSize, const int &offset)
{
    if (nuberSquareWidth * squareSize + offset * (nuberSquareWidth - 1) > 1800 || nuberSquareHeight * squareSize + offset * (nuberSquareHeight - 1) > 900)
    {
        nuberSquareWidth = floor(1600 / squareSize);
        nuberSquareHeight = floor(900 / squareSize);
        width = ceil(nuberSquareWidth * squareSize + offset * (nuberSquareWidth - 1));
        height = ceil(nuberSquareHeight * squareSize + offset * (nuberSquareHeight - 1));
    }
    else if (nuberSquareWidth < 5 || nuberSquareHeight < 5)
    {
        nuberSquareWidth = 5;
        nuberSquareHeight = 5;
        width = ceil(nuberSquareWidth * squareSize + offset * (nuberSquareWidth - 1));
        height = ceil(nuberSquareHeight * squareSize + offset * (nuberSquareHeight - 1));
    }
    else
    {
        width = ceil(nuberSquareWidth * squareSize + offset * (nuberSquareWidth - 1));
        height = ceil(nuberSquareHeight * squareSize + offset * (nuberSquareHeight - 1));
    }
}

Answer 1

问题在于我都继承了RectangleShape（我的方形IS A RectangleShape）并使RectangleShape（方形）成为myclass的成员。当我修改数据时，我修改了类成员变量，但在draw方法中我绘制了另一个矩形。

我删除了班级成员RectangleShape并从此处继续。

SFML - 无法在窗口中修改对象

1 个答案: