Android Rotate Matrix
- by jitm
Hello, I have matrix. This matrix represents array x and y coordinates. For example
float[] src = {7,1,7,2,7,3,7,4};
I need to rotate this coordinates to 90 degrees.
I use android.graphics.Matrix like this:
float[] src = {7,1,7,2,7,3,7,4};
float[] dist = new float[8];
Matrix matrix = new Matrix();
matrix.preRotate(90.0f);
matrix.mapPoints(dist,src);
after operation rotate I have array with next values
-1.0 7.0 -2.0 7.0 -3.0 7.0 -4.0 7.0
Its is good for area with 360 degrees.
And how do rotate in area from 0 to 90? I need set up center of circle in this area but how ?
Thanks.
