getLengths method
dynamic
getLengths(
- dynamic divisions
Implementation
getLengths(divisions) {
divisions ??= arcLengthDivisions;
if (cacheArcLengths != null &&
(cacheArcLengths!.length == divisions + 1) &&
!needsUpdate) {
return cacheArcLengths;
}
needsUpdate = false;
List<num> cache = [];
var current, last = getPoint(0, null);
num sum = 0.0;
cache.add(0);
for (var p = 1; p <= divisions; p++) {
current = getPoint(p / divisions, null);
sum += current.distanceTo(last);
cache.add(sum);
last = current;
}
cacheArcLengths = cache;
return cache; // { sums: cache, sum: sum }; Sum is in the last element.
}