Android Rotate Matrix
<p>I have matrix. This matrix represents array x and y coordinates. For example </p>

<pre><code>float[] src = {7,1,7,2,7,3,7,4};
</code></pre>

<p>I need to rotate this coordinates to 90 degrees.
I use  <code>android.graphics.Matrix</code> like this:</p>

<pre><code>    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);
</code></pre>

<p>after operation rotate I have array with next values</p>

<pre><code>-1.0    7.0     -2.0    7.0     -3.0    7.0     -4.0    7.0
</code></pre>

<p>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 ?<br>
Thanks.</p>
