As the following effect pictures, how to implement the effect ?
Note:
User can rotate the circle to select the desired value
The value(100,200,...3200) pointing by the arrow should match the value which on the circle background
I can rotate the circle ,using the mMatrix.postRotate(...) and setImageMatrix(mMatrix) at present. However, I cannot find a proper way to match the desired and right value on the circle.
I searched the related question and cost too much time about it , but I still have no idea about the mismatching problem.
The effect is same as the chordwheel .
Related link:
(1)rotate dial in limited degrees
(2)Draw text in circular view?
