Silverlight rotation center is fun

What I want to talk about is about the rotation of an object around a specified point. Generally, a new rotation center in Silverlight under blend has a rotation center, if you want to rotate a rectangle around its own corner ()

Rotate the logon box in this example around the circle in the upper left corner. The procedure is as follows:

In the first Zhen animation State, set the rotation center point position of the rectangular login box to coincide with the rotation center point of the circle, for example:

The last initial animation state is to move the center of rotation of the rectangular logon box to the center of the circular rotation to coincide with it, and set the conversion attribute to rotate and the angle is 360 degrees, for example:

 

In this way, OK. In fact, you only need to move the rotation center of the object to be rotated before and after the two slaves, to the point that you want to rotate around it (for example, the rotation center is O, to rotate around the X point, you only need to relay the O points of the first and last two slaves with the X point ).