Question

我选择了一个如何进行游戏循环的教程，无论渲染空间有多大或CPU的速度如何，帧速率总是相同的。它涉及使用一个时间间隔，但我已经倾倒了这一百次，我不明白为什么我的版本不起作用，所以我不知道它是我的，还是他们弄错了。

原始教程可以在这里找到 http://www.dreamincode.net/forums/topic/140540-creating-games-with-c%23-part-2/

namespace TileGame
{
    public partial class GameForm : Form
    {
        HiResTimer gameTime = new HiResTimer();

        long startTime;
        long interval = (long)TimeSpan.FromSeconds(1 / 30).TotalMilliseconds;

        Graphics g;
        Graphics imageGraphics;

        Image backBuffer;

        int clientWidth;
        int clientHeight;

        Rectangle image = new Rectangle(0, 0, 40, 50);
        Point direction = new Point(1, 2);

        public GameForm()
        {
            InitializeComponent();
            this.DoubleBuffered = true;
            this.MaximizeBox = false;
            this.FormBorderStyle = FormBorderStyle.FixedSingle;
            this.ClientSize = new Size(320, 240);

            clientHeight = this.ClientRectangle.Height;
            clientWidth = this.ClientRectangle.Width;

            backBuffer = (Image)new Bitmap(clientWidth, clientHeight);
            g = this.CreateGraphics();
            imageGraphics = Graphics.FromImage(backBuffer);
    }

    public void GameLoop()
    {
            gameTime.Start();
            while (this.Created)
        {
                startTime = gameTime.ElapsedMiliseconds;
                GameLogic();
                Render();
                Application.DoEvents();
                while (gameTime.ElapsedMiliseconds - startTime < interval) ;
            }
        }

        private void GameLogic()
        {
            image.X += direction.X;
            image.Y += direction.Y;

            if (image.X < 0)
            {
                image.X = 0;
                direction.X *= -1;
            }

            if (image.Y < 0)
            {
                image.Y = 0;
                direction.Y *= -1;
            }

            if (image.X + image.Width > clientWidth)
            {
                image.X = clientWidth - image.Width;
                direction.X *= -1;
            }

            if (image.Y + image.Height > clientHeight)
            {
                image.Y = clientHeight - image.Height;
                direction.Y *= -1;
            }

        }

        private void Render()
        {
            imageGraphics.FillRectangle(new SolidBrush(Color.Black),
                                    this.ClientRectangle);
            imageGraphics.FillRectangle(new SolidBrush(Color.Blue), image);

            this.BackgroundImage = backBuffer;
            this.Invalidate();

        }
    }
}

Answer 1

这是你的问题：

   long interval = (long)TimeSpan.FromSeconds(1 / 30).TotalMilliseconds;

您正在进行整数除法，结果将为0.

修复此问题，将其转换为浮点操作：

   long interval = (long)TimeSpan.FromSeconds(1 / 30.0d).TotalMilliseconds;

你的代码有其他问题，比如在while循环中忙等待，你应该让你的线程在等待时间内休眠。

Answer 2

我没有在代码中看到调用GameLoop方法的任何地方。在我将30改为30d并将其添加到Form的构造函数末尾之后，您的代码为我工作了：

new Thread(GameLoop) {IsBackground = true}.Start();

常量帧速率Gameloop使用System.Diagnostics.Stopwatch和C＃教程中的增量时间

2 个答案: