PickerViewCircle.java 文件源码

/**
 * @param canvas
 * @param position
 *            距离mCurrentSelected的差
 * @param type
 *            1表示向下绘制，-1表示向上绘制
 */
private void drawOtherText(Canvas canvas, int position, int type)
{
    float d = (float) (MARGIN_ALPHA * mMinTextSize * position + type
            * mMoveLen);
    float scale = parabola(mViewHeight / 4.0f, d);
    float size = (mMaxTextSize - mMinTextSize) * scale + mMinTextSize;
    mPaint.setTextSize(size);
    mPaint.setAlpha((int) ((mMaxTextAlpha - mMinTextAlpha) * scale + mMinTextAlpha));
    float y = (float) (mViewHeight / 2.0 + type * d);
    FontMetricsInt fmi = mPaint.getFontMetricsInt();
    float baseline = (float) (y - (fmi.bottom / 2.0 + fmi.top / 2.0));
       int valuePosition = mCurrentSelected + type * position;
       //调整位置偏差在 合法范围
       int dataSize = mDataList.size();
       valuePosition = (valuePosition + dataSize) % dataSize;
       //if(valuePosition >= 0 & valuePosition < dataSize) {//以防万一
           canvas.drawText(mDataList.get(valuePosition),
                   (float) (mViewWidth / 2.0), baseline, mPaint);
       //}
}