如何使用Direct2D API滚动窗口内容？ [英] How to scroll window contents using Direct2D api?

问题描述

我想通过ID2D1RenderTarget滚动其中使用Direct2D api进行绘制的窗口内容。

在GDI中，我可以使用CreateCompatibleDC创建一个缓冲区，然后滚动其内容使用ScrollDC，将裸露的区域重新绘制，并将BitBlt的缓冲区重新绘制到窗口。如何在不使用GetDC（和GDI）且不使用自己的第三个缓冲区的情况下实现相同的功能？

解决方案

MSDN：平移二维对象就是沿x轴，y轴或同时沿这两个轴移动该对象。

  m_pRenderTarget-> SetTransform（D2D1 :: Matrix3x2F :: Translation（20，10））; 
  

此处有更多详细信息
http://msdn.microsoft.com/en-us/library/windows/desktop/dd756691（ v = vs.85）.aspx

I would like to scroll window contents in which drawing is performed with Direct2D api through ID2D1RenderTarget.

In GDI I could create a buffer with CreateCompatibleDC and later scroll its contents with ScrollDC, redraw exposed area and BitBlt the buffer to window.

I cannot see any necessary API in Direct2D to perform the same operations. How can I achieve the same functionality without using GetDC (and GDI), and without using own third buffer?

解决方案

You can use translation.

MSDN: To translate a 2-D object is to move the object along the x-axis, the y-axis, or both.

m_pRenderTarget->SetTransform(D2D1::Matrix3x2F::Translation(20, 10));

More details here http://msdn.microsoft.com/en-us/library/windows/desktop/dd756691(v=vs.85).aspx

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