Question

使用OpenTK / OpenGL，我可以很好地绘制Winforms。但是我该如何使用打印机？

我使用ganttchart并使用这段代码进行打印，但我不知道如何让设备上下文进入GLControl。

private void print_click(object sender, EventArgs e)
{
    dialog.Document = new PrintDocument();
    using (var dialog = new PrintDialog())
    {
        if (dialog.ShowDialog() == System.Windows.Forms.DialogResult.OK)
        {
            dialog.Document.BeginPrint += new System.Drawing.Printing.PrintEventHandler(Document_BeginPrint);
            dialog.Document.EndPrint += new System.Drawing.Printing.PrintEventHandler(Document_EndPrint);
            dialog.Document.PrintPage += new System.Drawing.Printing.PrintPageEventHandler(Document_PrintPage);
            dialog.Document.Print();
        }
    }
}

void Document_PrintPage(object sender, System.Drawing.Printing.PrintPageEventArgs e)
{
    // This code does not work!
    // something to do with e.Graphics.GetHdc() ???
    var nullWindow = OpenTK.Platform.Utilities.CreateWindowsWindowInfo(IntPtr.Zero);
    // Exception of type 'OpenTK.Graphics.GraphicsContextException' was thrown.
    var printcontext = new OpenTK.Graphics.GraphicsContext(new ContextHandle(e.Graphics.GetHdc()), nullWindow);
    printcontext.MakeCurrent(nullWindow);
    // GL.Begin(...)
    // ...
    // GL.End()
    // printcontext.SwapBuffers()? Should be single-buffered?
}

void Document_EndPrint(object sender, System.Drawing.Printing.PrintEventArgs e)
{

}

void Document_BeginPrint(object sender, System.Drawing.Printing.PrintEventArgs e)
{

}

我还注意到了OpenTK.Graphics.GraphicsContext (ContextHandle handle, IWindowInfo window)构造函数，但我不确定要为IWindowInfo添加什么。

Answer 1

我刚刚考虑过的解决方法是拍摄渲染图像的位图快照，例如此处http://www.opentk.com/doc/graphics/save-opengl-rendering-to-disk

如何打印OpenTK（OpenGL）或更改设备上下文？

1 个答案: