centerViewPort method
Centers the viewport around the specified position (x-index and y-value) in the chart. Centering the viewport outside the bounds of the chart is not possible. Makes most sense in combination with the setScaleMinima(...) method.
@param transformedPts the position to center view viewport to
Implementation
void centerViewPort(final List<double> transformedPts) {
mCenterViewPortMatrixBuffer = Matrix4.identity();
Matrix4 save = mCenterViewPortMatrixBuffer;
_matrixTouch.copyInto(save);
final double x = transformedPts[0] - offsetLeft();
final double y = transformedPts[1] - offsetTop();
Matrix4Utils.postTranslate(save, -x, -y);
refresh(save);
}