XNA - Mouse.Left按钮在Update中多次执行

Question

我正在做一个Tic-Tac-Toe游戏.我需要检查玩家是否点击了他们已经点击过的广场.

问题是错误显示在第一次单击本身.我的更新代码是:

    MouseState mouse = Mouse.GetState();
    int x, y;
    int go = 0;
    if (mouse.LeftButton == ButtonState.Pressed)
    {
        showerror = 0;
        gamestate = 1;
        x = mouse.X;
        y = mouse.Y;
        int getx = x / squaresize;
        int gety = y / squaresize;
        for (int i = 0; i < 3; i++)
        {
            if (go == 1)
            {
                break;
            }
            for (int j = 0; j < 3; j++)
            {
                if (getx == i && gety == j)
                {
                    if (storex[i, j] == 0)
                    {
                       showerror = 1;
                    }
                    go = 1;
                    if (showerror != 1)
                    {
                        loc = i;
                        loc2 = j;
                        storex[i, j] = 0;
                        break;
                    }
                }
            }
        }
    }

showerror单击左键时设置为0.我的矩阵是一个3x3矩阵,用于存储信息.如果它是0表示它已被点击.所以在循环中我检查是否store[i,j] == 0然后设置showerror为1.现在在绘图函数中我做了这个调用淋浴

spriteBatch.Begin();
if (showerror == 1)
{
    spriteBatch.Draw(invalid, new Rectangle(25, 280, 105, 19), Color.White);                                        
}
spriteBatch.End();

问题是每当我点击空方块时它变成交叉但错误显示出来.请帮帮我

Answer 1

怎么修:

添加一个新的全局变量来存储前一帧中的鼠标状态:

MouseState oldMouseState;

在更新方法的最开始(或结束),添加此,

oldMouseState = mouse;

并替换

if (mouse.LeftButton == ButtonState.Pressed)

同

if (mouse.LeftButton == ButtonState.Pressed && oldMouseState.LeftButton == ButtonState.Released)

这样做是检查您是否单击一下,然后按下释放键,因为有时您可能会按住多个帧的键.

回顾:

通过oldMouseState在更新之前设置currentMouseState(或者在完成之后),您保证oldMouseState将落后一帧currentMouseState.使用此功能,您可以检查按钮是否在前一帧中,但不再检查,并相应地处理输入.一个好主意,延长这是写一些扩展方法一样IsHolding(),IsClicking()等等.

在简单的代码中:

private MouseState oldMouseState, currentMouseState;
protected override void Update(GameTime gameTime)
{
     oldMouseState = currentMouseState;
     currentMouseState = Mouse.GetState();
     //TODO: Update your code here
}