Rotate3dAnimation.java 文件源码

@Override
protected void applyTransformation(float interpolatedTime, Transformation t) {
    final float fromDegrees = mFromDegrees;
    float degrees = fromDegrees + ((mToDegrees - fromDegrees) * interpolatedTime);

    final Matrix matrix = t.getMatrix();

    mCamera.save();
    switch (mRollType) {
        case ROLL_BY_X:
            mCamera.rotateX(degrees);
            break;
        case ROLL_BY_Y:
            mCamera.rotateY(degrees);
            break;
        case ROLL_BY_Z:
            mCamera.rotateZ(degrees);
            break;
    }
    mCamera.getMatrix(matrix);
    mCamera.restore();

    matrix.preTranslate(-mPivotX, -mPivotY);
    matrix.postTranslate(mPivotX, mPivotY);
}