C# 在 2D 中将一个点旋转另一个点
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Rotate a point by another point in 2D
提问by James
I want to know how to work out the new co-ordinates for a point when rotated by an angle relative to another point.
我想知道如何计算一个点相对于另一个点旋转一个角度时的新坐标。
I have a block arrow and want to rotate it by an angle theta relative to a point in the middle of the base of the arrow.
我有一个块箭头，想将它旋转一个角度 theta 相对于箭头底部中间的一个点。
This is required to allow me to draw a polygon between 2 onscreen controls. I can't use and rotate an image.
这是允许我在 2 个屏幕控件之间绘制多边形所必需的。我无使用和旋转图像。
From what I have considered so far what complicates the matter further is that the origin of a screen is in the top left hand corner.
从我目前所考虑的情况来看，使问题进一步复杂化的是屏幕的原点位于左上角。
采纳答案by Sophie Alpert
If you rotate point (px, py)around point (ox, oy)by angle thetayou'll get:
如果您旋转点(px, py)周围点(ox, oy)的角度theta，你会得到：
p'x = cos(theta) * (px-ox) - sin(theta) * (py-oy) + ox p'y = sin(theta) * (px-ox) + cos(theta) * (py-oy) + oy
回答by Mehrdad Afshari
If you are using GDI+ to do that, you can use Transformmethods of the Graphicsobject:
如果您使用 GDI+ 来做到这一点，您可以使用对象的Transform方Graphics：
graphics.TranslateTransform(point of origin);
graphics.RotateTransform(rotation angle);
Then draw the actual stuff.
然后画出实物。
回答by thumbmunkeys
If you have the System.Windows.Medianamespace available, then you can use the built in transformations:
如果您有System.Windows.Media可用的命名空间，那么您可以使用内置转换：
using System.Windows.Media;
var transform = new RotateTransform() {Angle = angleInDegrees, CenterX = center.X, CenterY = center.Y};
var transformedPoint = transform.Transform(point);
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