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Port boolean functions and tests (#91)
* in process - early analysis of the work * linked the meta functions in readme * CONTRIBUTING.md * links to the sources * edited typos * documentation work * closes #77, closes #16 * proofread * improves pub.dev score, closes #79, #78, #75 * Added deleted model, complemented contributing.md * booleans init * initial import * boolean_touches * valid - wip * within - init * rewiring the translated code * contains etc. * touches * valid * dependencies imported * Update CONTRIBUTING.md * clockwise test * concave test * intersect test * pointOnLine test * contains * crosses_test - blocked by findIntersections * boolean_contain * boolean_within * rhumb_bearing * rhumb_bearing\'s test - incomplete * rhumb_bearing's test - done, added to lib/bearing * boolean_contains, boolean_parallel, IP * working on contain - removed usages of runtimeType * rewriting pointInLine * tests reverted to false/true folder style * restructuring, clean-up * clockwise and its test, documentation * concave finalized * PointInPolygon plus test, dart format * removed the commented JS lines * return type added * disjoint and test - not done, depends on sweepline * equal implement, test, has dependencies * moving on * clean coords init * cleanCoord implemented, going to new branch * moving on with equal * update turf_equality dep * moving forward * refactors boolean_equal * #88 crosses, disjoint, equal, intersects, pip @lukas-h * cleanup on #88 * progress on overlap * bool: overlap,parallel,valid,touches & lineOverlap * issue with test is worked on * still at porting the overlap test * done: parallel * working on valid * touches done * valid - got stuck * progress on within * moved on with valid, refactored * valid test * lineIntersection testet - contains sweepline * package publishabe, rm git deps, fix equality dep * update params in equality * mod. on valid to cover the std. - MutiPs' 'finite' * RFCs resolved - readied for merge * return type of getGeom * linter effect! * reolved requests * more requests resolved * more requests resolved * test name, touching lineOverlap * fix conversations in booleanContains * fixes conversations in crosses and disjoint * resolves allllllllll outdated conversations, refactor * use getGeom in booleanTouches * use getGeom more frequently * rm linter rule, which is already inherited from dartclub_lint * cleanup, ready for merge Co-authored-by: Lukas Himsel <lukas@himsel.me>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,47 @@ | ||
| import 'package:turf/src/invariant.dart'; | ||
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| import '../../helpers.dart'; | ||
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| /// Takes a ring and return [true] or [false] whether or not the ring is clockwise | ||
| /// or counter-clockwise. | ||
| /// Takes a [Feature<LineString>] or[LineString] or a [List<Position>] to be | ||
| /// evaluated. | ||
| /// example: | ||
| /// ```dart | ||
| /// var clockwiseRing = LineString( | ||
| /// coordinates: [ | ||
| /// Position.of([0, 0]), | ||
| /// Position.of([1, 1]), | ||
| /// Position.of([1, 0]), | ||
| /// Position.of([0, 0]) | ||
| /// ], | ||
| /// ); | ||
| /// var counterClockwiseRing = LineString( | ||
| /// coordinates: [ | ||
| /// Position.of([0, 0]), | ||
| /// Position.of([1, 0]), | ||
| /// Position.of([1, 1]), | ||
| /// Position.of([0, 0]) | ||
| /// ], | ||
| /// ); | ||
| /// | ||
| /// booleanClockwise(clockwiseRing); | ||
| /// //=true | ||
| /// booleanClockwise(counterClockwiseRing); | ||
| /// //=false | ||
| /// ``` | ||
| bool booleanClockwise(LineString line) { | ||
| var ring = getCoords(line) as List<Position>; | ||
| num sum = 0; | ||
| int i = 1; | ||
| Position prev; | ||
| Position? cur; | ||
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| while (i < ring.length) { | ||
| prev = cur ?? ring[0]; | ||
| cur = ring[i]; | ||
| sum += (cur[0]! - prev[0]!) * (cur[1]! + prev[1]!); | ||
| i++; | ||
| } | ||
| return sum > 0; | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,42 @@ | ||
| import 'package:turf/helpers.dart'; | ||
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| /// Takes a [Polygon] and returns [true] or [false] as to whether it is concave | ||
| /// or not. | ||
| /// example: | ||
| /// ```dart | ||
| /// var convexPolygon = Polygon(coordinates: [ | ||
| /// [ | ||
| /// Position.of([0, 0]), | ||
| /// Position.of([0, 1]), | ||
| /// Position.of([1, 1]), | ||
| /// Position.of([1, 0]), | ||
| /// Position.of([0, 0]) | ||
| /// ] | ||
| /// ]); | ||
| /// booleanConcave(convexPolygon); | ||
| /// //=false | ||
| /// ``` | ||
| bool booleanConcave(Polygon polygon) { | ||
| // Taken from https://stackoverflow.com/a/1881201 & https://stackoverflow.com/a/25304159 | ||
| List<List<Position>> coords = polygon.coordinates; | ||
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| if (coords[0].length <= 4) { | ||
| return false; | ||
| } | ||
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| var sign = false; | ||
| var n = coords[0].length - 1; | ||
| for (var i = 0; i < n; i++) { | ||
| var dx1 = coords[0][(i + 2) % n][0]! - coords[0][(i + 1) % n][0]!; | ||
| var dy1 = coords[0][(i + 2) % n][1]! - coords[0][(i + 1) % n][1]!; | ||
| var dx2 = coords[0][i][0]! - coords[0][(i + 1) % n][0]!; | ||
| var dy2 = coords[0][i][1]! - coords[0][(i + 1) % n][1]!; | ||
| var zcrossproduct = dx1 * dy2 - dy1 * dx2; | ||
| if (i == 0) { | ||
| sign = zcrossproduct > 0; | ||
| } else if (sign != zcrossproduct > 0) { | ||
| return true; | ||
| } | ||
| } | ||
| return false; | ||
| } |
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