AutoTextView.java 文件源码

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

    final float centerX = mCenterX;
    final float centerY = mCenterY;
    final Camera camera = mCamera;
    final int derection = mTurnUp ? 1 : -1;

    final Matrix matrix = t.getMatrix();

    camera.save();
    if (mTurnIn) {
        camera.translate(0.0f, derection * mCenterY * (interpolatedTime - 1.0f), 0.0f);
    } else {
        camera.translate(0.0f, derection * mCenterY * (interpolatedTime), 0.0f);
    }
    camera.rotateX(degrees);
    camera.getMatrix(matrix);
    camera.restore();

    matrix.preTranslate(-centerX, -centerY);
    matrix.postTranslate(centerX, centerY);
}