谁能告诉我我该如何相对于用户给出的触摸旋转视图...。
我的意思是我想像旧电话一样出现(按并旋转拨号...)...
我知道如何旋转,但是根据这种情况无法旋转.....
最佳答案
您只需要一个带有拨号图像的视图。
This view has a center C(x,y)
First, the view will be touched at coordinate T0(x,y)
if the x and y is within the circle do the tracking:
Then the finger will move to coordinate Tn(x,y)
Find the angle made up by Tn(x,y) C(x,y) T0(x,y) //(See below for a reference)
and do the rotation using that angle as you already know ;)
else
do nothing since the touch is not in the dial
参考:How to calculate an angle from three points