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/**
* Transforms circle coordinates into bounds for camera movement
*
* @param center
* @param latDistanceInMeters
* @param lngDistanceInMeters
* @return
*/
public static LatLngBounds boundsWithCenterAndLatLngDistance(LatLng center,
float latDistanceInMeters, float lngDistanceInMeters) {
latDistanceInMeters /= 2;
lngDistanceInMeters /= 2;
LatLngBounds.Builder builder = LatLngBounds.builder();
float[] distance = new float[1];
{
boolean foundMax = false;
double foundMinLngDiff = 0;
double assumedLngDiff = ASSUMED_INIT_LATLNG_DIFF;
do {
Location.distanceBetween(center.latitude, center.longitude,
center.latitude, center.longitude + assumedLngDiff,
distance);
float distanceDiff = distance[0] - lngDistanceInMeters;
if (distanceDiff < 0) {
if (!foundMax) {
foundMinLngDiff = assumedLngDiff;
assumedLngDiff *= 2;
} else {
double tmp = assumedLngDiff;
assumedLngDiff += (assumedLngDiff - foundMinLngDiff) / 2;
foundMinLngDiff = tmp;
}
} else {
assumedLngDiff -= (assumedLngDiff - foundMinLngDiff) / 2;
foundMax = true;
}
} while (Math.abs(distance[0] - lngDistanceInMeters) > lngDistanceInMeters
* ACCURACY);
LatLng east = new LatLng(center.latitude, center.longitude
+ assumedLngDiff);
builder.include(east);
LatLng west = new LatLng(center.latitude, center.longitude
- assumedLngDiff);
builder.include(west);
}
{
boolean foundMax = false;
double foundMinLatDiff = 0;
double assumedLatDiffNorth = ASSUMED_INIT_LATLNG_DIFF;
do {
Location.distanceBetween(center.latitude, center.longitude,
center.latitude + assumedLatDiffNorth,
center.longitude, distance);
float distanceDiff = distance[0] - latDistanceInMeters;
if (distanceDiff < 0) {
if (!foundMax) {
foundMinLatDiff = assumedLatDiffNorth;
assumedLatDiffNorth *= 2;
} else {
double tmp = assumedLatDiffNorth;
assumedLatDiffNorth += (assumedLatDiffNorth - foundMinLatDiff) / 2;
foundMinLatDiff = tmp;
}
} else {
assumedLatDiffNorth -= (assumedLatDiffNorth - foundMinLatDiff) / 2;
foundMax = true;
}
} while (Math.abs(distance[0] - latDistanceInMeters) > latDistanceInMeters
* ACCURACY);
LatLng north = new LatLng(center.latitude + assumedLatDiffNorth,
center.longitude);
builder.include(north);
}
{
boolean foundMax = false;
double foundMinLatDiff = 0;
double assumedLatDiffSouth = ASSUMED_INIT_LATLNG_DIFF;
do {
Location.distanceBetween(center.latitude, center.longitude,
center.latitude - assumedLatDiffSouth,
center.longitude, distance);
float distanceDiff = distance[0] - latDistanceInMeters;
if (distanceDiff < 0) {
if (!foundMax) {
foundMinLatDiff = assumedLatDiffSouth;
assumedLatDiffSouth *= 2;
} else {
double tmp = assumedLatDiffSouth;
assumedLatDiffSouth += (assumedLatDiffSouth - foundMinLatDiff) / 2;
foundMinLatDiff = tmp;
}
} else {
assumedLatDiffSouth -= (assumedLatDiffSouth - foundMinLatDiff) / 2;
foundMax = true;
}
} while (Math.abs(distance[0] - latDistanceInMeters) > latDistanceInMeters
* ACCURACY);
LatLng south = new LatLng(center.latitude - assumedLatDiffSouth,
center.longitude);
builder.include(south);
}
return builder.build();
}
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