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Ray-casting algorithm: Difference between revisions
javascript
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=={{header|Java}}==
<lang javascript>
/**
* @return {boolean} true if (lng, lat) is in bounds
*/
function contains(bounds, lat, lng) {
//https://rosettacode.org/wiki/Ray-casting_algorithm
var count = 0;
for (var b = 0; b < bounds.length; b++) {
var vertex1 = bounds[b];
var vertex2 = bounds[(b + 1) % bounds.length];
if (west(vertex1, vertex2, lng, lat))
++count;
}
return count % 2;
/**
* @return {boolean} true if (x,y) is west of the line segment connecting A and B
*/
function west(A, B, x, y) {
if (A.y < B.y) {
if (y < A.y || y > B.y ||
x >= A.x && x >= B.x) {
return false;
} else if (x < A.x && x < B.x) {
return true;
} else {
return (y - A.y) / (x - A.x) > (B.y - A.y) / (B.x - A.x);
}
} else {
return west(B, A, x, y);
}
}
}
</lang>
=={{header|Kotlin}}==
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