How to check if a given longitude value is within any longitude range?
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21-09-2019 - |
Question
OK. This might be more of a math question but here goes.
I have a longitude value, let's say X. And I want to know if X falls between any two longitude values.
For example, if my X is 145 and the range is [21, -179]. The range is given by the Google Map API bounds and I can see on the google map that X does fall within that range.
However, how can I actually calculate this?
Solution
// check if x is between min and max, inclusively
if ( x >= minLongitude && x <= maxLongitude )
return true;
OTHER TIPS
/*
* Return true if and only if the longitude value lng lies in the range [min, max].
*
* All input values should be in the range [-180, +180].
* The test is conducted clockwise.
*/
private boolean isLongitudeInRange(double lng, double min, double max) {
assert(lng >= -180.0 && lng <= 180.0);
assert(min >= -180.0 && min <= 180.0);
assert(max >= -180.0 && max <= 180.0);
if (lng < min) {
lng += 360.0;
}
if (max < min) {
max += 360.0;
}
return (lng >= min) && (lng <= max);
}
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