我正在尝试设计一个可以传递给MongoDB的查询，该查询可以有效地获取多个zipcodes的指定半径内的所有zipcodes。
例如，我会传递一个zipcodes列表（public class LinePagerIndicatorDecoration extends RecyclerView.ItemDecoration {
private int colorActive = 0xFFFFFFFF;
private int colorInactive = 0x66FFFFFF;
private static final float DP = Resources.getSystem().getDisplayMetrics().density;
/**
* Height of the space the indicator takes up at the bottom of the view.
*/
private final int mIndicatorHeight = (int) (DP * 16);
/**
* Indicator stroke width.
*/
private final float mIndicatorStrokeWidth = DP * 2;
/**
* Indicator width.
*/
private final float mIndicatorItemLength = DP * 16;
/**
* Padding between indicators.
*/
private final float mIndicatorItemPadding = DP * 4;
/**
* Some more natural animation interpolation
*/
private final Interpolator mInterpolator = new AccelerateDecelerateInterpolator();
private final Paint mPaint = new Paint();
public LinePagerIndicatorDecoration() {
mPaint.setStrokeCap(Paint.Cap.ROUND);
mPaint.setStrokeWidth(mIndicatorStrokeWidth);
mPaint.setStyle(Paint.Style.STROKE);
mPaint.setAntiAlias(true);
}
@Override
public void onDrawOver(Canvas c, RecyclerView parent, RecyclerView.State state) {
super.onDrawOver(c, parent, state);
int itemCount = parent.getAdapter().getItemCount();
// center horizontally, calculate width and subtract half from center
float totalLength = mIndicatorItemLength * itemCount;
float paddingBetweenItems = Math.max(0, itemCount - 1) * mIndicatorItemPadding;
float indicatorTotalWidth = totalLength + paddingBetweenItems;
float indicatorStartX = (parent.getWidth() - indicatorTotalWidth) / 2F;
// center vertically in the allotted space
float indicatorPosY = parent.getHeight() - mIndicatorHeight / 2F;
drawInactiveIndicators(c, indicatorStartX, indicatorPosY, itemCount);
// find active page (which should be highlighted)
LinearLayoutManager layoutManager = (LinearLayoutManager) parent.getLayoutManager();
int activePosition = layoutManager.findFirstVisibleItemPosition();
if (activePosition == RecyclerView.NO_POSITION) {
return;
}
// find offset of active page (if the user is scrolling)
final View activeChild = layoutManager.findViewByPosition(activePosition);
int left = activeChild.getLeft();
int width = activeChild.getWidth();
// on swipe the active item will be positioned from [-width, 0]
// interpolate offset for smooth animation
float progress = mInterpolator.getInterpolation(left * -1 / (float) width);
drawHighlights(c, indicatorStartX, indicatorPosY, activePosition, progress, itemCount);
}
private void drawInactiveIndicators(Canvas c, float indicatorStartX, float indicatorPosY, int itemCount) {
mPaint.setColor(colorInactive);
// width of item indicator including padding
final float itemWidth = mIndicatorItemLength + mIndicatorItemPadding;
float start = indicatorStartX;
for (int i = 0; i < itemCount; i++) {
// draw the line for every item
c.drawLine(start, indicatorPosY, start + mIndicatorItemLength, indicatorPosY, mPaint);
start += itemWidth;
}
}
private void drawHighlights(Canvas c, float indicatorStartX, float indicatorPosY,
int highlightPosition, float progress, int itemCount) {
mPaint.setColor(colorActive);
// width of item indicator including padding
final float itemWidth = mIndicatorItemLength + mIndicatorItemPadding;
if (progress == 0F) {
// no swipe, draw a normal indicator
float highlightStart = indicatorStartX + itemWidth * highlightPosition;
c.drawLine(highlightStart, indicatorPosY,
highlightStart + mIndicatorItemLength, indicatorPosY, mPaint);
} else {
float highlightStart = indicatorStartX + itemWidth * highlightPosition;
// calculate partial highlight
float partialLength = mIndicatorItemLength * progress;
// draw the cut off highlight
c.drawLine(highlightStart + partialLength, indicatorPosY,
highlightStart + mIndicatorItemLength, indicatorPosY, mPaint);
// draw the highlight overlapping to the next item as well
if (highlightPosition < itemCount - 1) {
highlightStart += itemWidth;
c.drawLine(highlightStart, indicatorPosY,
highlightStart + partialLength, indicatorPosY, mPaint);
}
}
}
@Override
public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
super.getItemOffsets(outRect, view, parent, state);
outRect.bottom = mIndicatorHeight;
}
}
）和半径20km。响应将是落在该半径范围内的所有zipcode的列表。
以下是我的集合中的文档示例，其中["10001", "97201", "37208"]上有一个2dsphere索引。
loc我不确定最佳解决方案是什么，甚至可以在一个查询/ map-reduce中实现。任何帮助将不胜感激。