Question

我需要一些CarouselExample的帮助，可以使用此link检出。我想让它垂直旋转。我在.rs文件中找到了一个名为getMatrixForCard的方法，其中完成了对矩阵的转换。这是方法：

static bool getMatrixForCard(rs_matrix4x4* matrix, int i, bool enableSway, bool   
enableCardMatrix)
{
float theta = cardPosition(i);
float swayAngle = getSwayAngleForVelocity(velocity, enableSway);
rsMatrixRotate(matrix, degrees(theta), 0, 1, 0);
rsMatrixTranslate(matrix, radius, getVerticalOffsetForCard(i), 0); 
/* rsMatrixTranslate(matrix, 0, radius, 0);*/
float rotation = cardRotation + swayAngle;
if (!cardsFaceTangent) {
  rotation -= theta;
}
rsMatrixRotate(matrix, degrees(rotation), 0, 1, 0);
bool stillAnimating = false;
if (i == animatedSelection) {
    float3 scale;
    stillAnimating = getAnimatedScaleForSelected(&scale);
    rsMatrixScale(matrix, scale.x, scale.y, scale.z);
}
// TODO(jshuma): Instead of ignoring this matrix for the detail texture, use card 
bounding box
if (enableCardMatrix) {
    rsMatrixLoadMultiply(matrix, matrix, &cards[i].matrix);
}
return stillAnimating;
}

所以我猜想从这一行用y改变x的值会使它起作用。

rsMatrixTranslate(matrix, radius, getVerticalOffsetForCard(i), 0);

但事实并非如此。如果有人检查了这个例子，并知道如何帮助我并使旋转木马垂直，我将不胜感激。

Answer 1

您无需更改此功能，您需要更改其他一些参数

在 carousel.rs 文件中替换

static const float3 cardVertices[4] = {
        { -1.0, -1.0, 0.0 },
        { 1.0, -1.0, 0.0 },
        { 1.0, 1.0, 0.0 },
        {-1.0, 1.0, 0.0 }
};
// Default camera
static PerspectiveCamera camera = {
        {2,2,2}, // from
        {0,0,0}, // at
        {0,1,0}, // up
        25.0f,   // field of view
        1.0f,    // aspect
        0.1f,    // near
        100.0f   // far
};

带

static const float3 cardVertices[4] = {
        { 0.0, -1.0, -1.0 },
        { 0.0, -1.0, 1.0 },
        { 0.0, 1.0, 1.0 },
        { 0.0, 1.0, -1.0 }
};

static PerspectiveCamera camera = {
        {2,2,2}, // from
        {0,0,0}, // at
        {0,1,0}, // up
        40.0f,   // field of view
        1.0f,    // aspect
        0.1f,    // near
        100.0f   // far
};

并在 CarouselTestActivity.java 更改

private static final int CARD_SLOTS = 56;

到

private static final int CARD_SLOTS = 30;

并将 onCreate（）更改为

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setContentView(R.layout.carousel_test);
    mView = (CarouselView) findViewById(R.id.carousel);
    mView.getHolder().setFormat(PixelFormat.RGBA_8888);
    mPaint.setColor(0xffffffff);
    final Resources res = getResources();

    mHelper = new LocalCarouselViewHelper(this);
    mHelper.setCarouselView(mView);
    mView.setSlotCount(CARD_SLOTS);
    mView.createCards(INCREMENTAL_ADD ? 1: TOTAL_CARDS);
    mView.setVisibleSlots(SLOTS_VISIBLE);
    mBorder = BitmapFactory.decodeResource(res, R.drawable.border);
    mView.setDefaultBitmap(mBorder);
    mView.setLoadingBitmap(mBorder);
    mView.setBackgroundColor(0.25f, 0.25f, 0.5f, 0.5f);
    mView.setRezInCardCount(3.0f);
    mView.setFadeInDuration(250);
    mView.setVisibleDetails(VISIBLE_DETAIL_COUNT);
    mView.setDragModel(CarouselView.DRAG_MODEL_CYLINDER_INSIDE);

    // New settings
    mView.setStartAngle((float) -(11.7f*Math.PI / 10));
    mView.setVisibleDetails(6);
    mView.setRowCount(3);
    mView.setRadius(10f);
    float mEye[] = { 2f, 0f, 0f };
    float mAt[] = { 0.0f, 0.0f, 0.0f };
    float mUp[] = { 0.0f, 1.0f, 0.0f };
    mView.setLookAt(mEye, mAt, mUp);
    mView.setCardsFaceTangent(true);

    if (INCREMENTAL_ADD) {
        mView.postDelayed(mAddCardRunnable, 2000);
    }

    mGlossyOverlay = BitmapFactory.decodeResource(res, R.drawable.glossy_overlay);
}

输出如下 Vertical Carousel

垂直旋转木马renderscript

1 个答案: