Question

我试图用绘图操作编写一个直接绘制到屏幕上的类。我的想法是有一个恒定的循环，它渲染图形缓冲区和几个函数，写入图形缓冲区（线条，矩形等）。现在线程存在问题。当它在不同线程的循环中使用时，我无法写入图形缓冲区。但我需要不同的线程来保持恒定的性能/帧速率。我试图创造一个＆＃34;共享＆＃34;缓冲区以位图的形式，但性能很糟糕。有谁有任何想法，如何解决这个问题？当前的错误消息是：System.InvalidOperationException @ myGraphics.Clear（Color.Black）;

class drawingOnScreen
{
    IntPtr desktop; //a pointer to the desktop
    Graphics g; //the graphics object

    BufferedGraphicsContext currentContext; 
    BufferedGraphics myBuffer; //graphics buffer

    Thread renderThread; //the thread

    [DllImport("User32.dll")]
    static extern IntPtr GetDC(IntPtr hwnd);

    public void drawLine(Vector2D point1, Vector2D point2, float width, Color color) //Vector2D is basically like Point2D
    {
        myBuffer.Graphics.DrawLine(new Pen(color, width), point1.x, point1.y, point2.x, point2.y); //trying to draw a line into the buffer
    }

    public void init() //initializing everything
    {
        desktop = GetDC(IntPtr.Zero); //setting up for drawing directly to the screen
        g = Graphics.FromHdc(desktop); //setting up for drawing directly to the screen

        currentContext = BufferedGraphicsManager.Current; //setting up the render buffer
        myBuffer = currentContext.Allocate(g, new Rectangle(0, 0, 300, 300)); //setting up the render buffer

        renderThread = new Thread(new ThreadStart(renderOp)); //setting up a seperated thread for rendering to avoid lag etc.
        renderThread.Start(); //starting the thread
    }

    void renderOp() //the render thread as a loop
    {
        while (true)
        {
            myBuffer.Graphics.Clear(Color.Black); //clear the background

            myBuffer.Render(); //render when every drawing operation is finished
        }
    }
}

感谢任何试图解决我的问题。

从不同的线程中划入共享图形缓冲区？

0 个答案: