C++在 Direct2D 设备中绘制圆弧
我需要在 D2D 设备中绘制圆弧，是否有函数可以执行此操作？（例如 DrawLine 或 DrawEllipse） 否则，我看到有 ArcSegment 函数返回 D2D1_ARC_SEGMENT 结构，我该如何绘制它？
I need to draw an arc in a D2D device, is there a function that does this?(something like DrawLine or DrawEllipse)
Otherwise, i've seen that there is the ArcSegment function that returns a D2D1_ARC_SEGMENT structure, how can i draw that?
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填充路径几何图形 (
ID2D1PathGeometry) 时可以使用D2D1_ARC_SEGMENT。将所需的圆弧添加到路径后，您可以使用ID2D1RenderTarget::Draw/FillGeometry()绘制它。The
D2D1_ARC_SEGMENTcan be used when populating a path geometry (ID2D1PathGeometry). Once you've added the arc you want to the path, you can draw it usingID2D1RenderTarget::Draw/FillGeometry().我对 Direct2D 不太熟悉，所以我不知道任何特定的函数可以让你做到这一点，但是它不会阻止你实现自己的函数来实现你想要的。
我建议研究样条曲线及其计算方式 wiki
似乎是一个不错的起点。然后，您可以使用公式和多次 DrawLine 调用来生成 Arc。
编辑：甚至这个可能会更好地为您服务。
Im not too familiar with Direct2D so I am unaware of any specific function that would allow you to do this, however it does not stop you from implementing your own function to achieve what you want.
I recommend looking into splines and how they are calculated wiki
seems like a good place to start. You could then generate your Arc with with the formula and several DrawLine calls.
Edit: or even this may serve you better.