andriiheonia/hull

JavaScript library that builds concave hull by a set of points. Note: this library is not actively maintained since 2015.

hull's Issues

:bug: No formatting in case there are less than 4 point

Call like

hull(coords, defaultConcavity, ['.lng', '.lat']);

will result in array of array tuples if you have less than 4 points in your points coords array and not being formatted into objects. Means, the result is unexpected.

Expected: [ { lng: 1, lat: 1}, { lng: 1, lat: 1}, { lng: 1, lat: 1}, { lng: 1, lat: 1} ]
Actual: [ [1,1], [1,1], [1,1], [1,1]]

C++ Implementation

Your library has been the only readable and functioning Concave hull algorithm I've seen thus far. Also, it seems to run quite fast.

Currently, there is no Concave hull algorithm in C++ on the entire internet open source. Have you every thought of porting this to C++?

Usage of a more accurate distance Caclulation

I wanted to use your library for a project where I would like to create a hull for a number of geopositions.
To make the calculation more accurate I would to build an (optional) method as an alternative for _sqLength() to calcute the distance by Haversine (http://en.wikipedia.org/wiki/Haversine_formula) and not by Pythagoras.

Thank you for this great project by the way!

Concavity parameter doesn't work

I tried using Hull.js with a little over 1000 points, and tried setting the concavity parameter to different values but I get the same results each time and the area is not concave as it should.

innerPoints calculation error

Hi,

please note that the below code does not filter duplicate points as expected.

 innerPoints = pointset.filter(function (pt) {
    return convex.indexOf(pt) < 0;
});

In your main 'How it works' example the point [124,210] is duplicated in the input data set. It exists in both the pointset and convex arrays. Only one of the duplicates is filtered by the above code. Hence inner points still contains this point after the filter is complete.

Not elegant, but the below replacement code would fix.

var innerPoints = [];
for (var i = 0; i < pointset.length; i++) {
    var duplicate = false;
    for (var j = 0; j < convex.length; j++) {
        if (convex[j][0] === pointset[i][0] && convex[j][1] === pointset[i][1]) {
            duplicate = true;
            break;
        }
    }
    if (!duplicate) innerPoints.push(pointset[i]);
}

Polygon corrupted if pointset across longitude 180° meridian

Hi

The result may be currupted if the dataset contain points that are near longitude +-180° .

For example:

var pointset = [{"lng":145.529,"lat":18.515},{"lng":130.726,"lat":32.782},{"lng":-153.452,"lat":59.658},{"lng":140.493,"lat":27.831},{"lng":178.76,"lat":51.797},{"lng":144.679,"lat":37.149},{"lng":153.221,"lat":54.892},{"lng":150.788,"lat":46.221},{"lng":143.949,"lat":37.89},{"lng":145.064,"lat":49.8},{"lng":143.264,"lat":38.034},{"lng":-171.836,"lat":52.05},{"lng":141.588,"lat":38.276},{"lng":142.372,"lat":38.297},{"lng":141.111,"lat":36.281},{"lng":144.59,"lat":38.058},{"lng":142.842,"lat":38.435},{"lng":143.698,"lat":26.901},{"lng":155.154,"lat":46.857},{"lng":152.886,"lat":53.882},{"lng":142.668,"lat":22.013},{"lng":154.524,"lat":46.243},{"lng":153.266,"lat":46.592},{"lng":167.089,"lat":60.949},{"lng":144.896,"lat":38.107},{"lng":142.039,"lat":38.276},{"lng":145.119,"lat":43.006},{"lng":136.618,"lat":33.07},{"lng":137.071,"lat":33.184},{"lng":178.65,"lat":51.146},{"lng":142.619,"lat":37.812},{"lng":143.91,"lat":41.815},{"lng":141.568,"lat":38.849},{"lng":-147.444,"lat":63.517},{"lng":143.73,"lat":22.338},{"lng":162.035,"lat":54.841},{"lng":-177.632,"lat":51.564},{"lng":-176.847,"lat":51.478},{"lng":149.3,"lat":44.663},{"lng":130.175,"lat":27.929},{"lng":142.827,"lat":52.629},{"lng":143.419,"lat":40.525},{"lng":147.916,"lat":43.905},{"lng":147.321,"lat":43.773},{"lng":158.647,"lat":51.934},{"lng":139.197,"lat":42.851},{"lng":157.829,"lat":51.218},{"lng":143.691,"lat":43.3},{"lng":143.33,"lat":39.419},{"lng":151.021,"lat":45.533},{"lng":142.76,"lat":39.837},{"lng":-174.776,"lat":51.52},{"lng":163.4,"lat":56.2},{"lng":148.192,"lat":44.117},{"lng":139.102,"lat":40.462},{"lng":146.753,"lat":43.53},{"lng":146.581,"lat":44.592},{"lng":142.028,"lat":38.19},{"lng":148.862,"lat":44.244},{"lng":148.439,"lat":44.932},{"lng":118.401,"lat":39.664},{"lng":117.98,"lat":39.57},{"lng":149.123,"lat":44.915},{"lng":147.734,"lat":43.024},{"lng":122.58,"lat":40.64},{"lng":173.5,"lat":53.11},{"lng":146.4,"lat":43.3},{"lng":145.8,"lat":43.2},{"lng":156.6,"lat":50.5},{"lng":140.7,"lat":33.3},{"lng":140.8,"lat":33.3},{"lng":163.3,"lat":56},{"lng":141.2,"lat":46.5},{"lng":143.5,"lat":41.4},{"lng":-177.2,"lat":51.4},{"lng":131.7,"lat":32.2},{"lng":163.6,"lat":57.7},{"lng":147.9,"lat":43.6},{"lng":119.4,"lat":38.2},{"lng":143.2,"lat":45},{"lng":140.6,"lat":26.3},{"lng":143.1,"lat":39.4},{"lng":143.2,"lat":40.8},{"lng":142.7,"lat":41.5},{"lng":132.5,"lat":32.3},{"lng":146.701,"lat":43.586},{"lng":151.11,"lat":45.53},{"lng":148.7,"lat":44.7},{"lng":177.93,"lat":50.32},{"lng":178.55,"lat":51.29},{"lng":139.2,"lat":38.65},{"lng":-147.648,"lat":61.017},{"lng":150.563,"lat":44.772},{"lng":149.798,"lat":44.77},{"lng":149.272,"lat":44.426},{"lng":142.741,"lat":38.073},{"lng":136.7,"lat":36},{"lng":131.8,"lat":31.6},{"lng":143.4,"lat":39.8},{"lng":151.11,"lat":45.89},{"lng":160.5,"lat":53.9},{"lng":159.5,"lat":52.5},{"lng":148.54,"lat":44.53},{"lng":116.4,"lat":56.2},{"lng":-165.2,"lat":55},{"lng":-175.629,"lat":51.292},{"lng":150.5,"lat":46},{"lng":141.7,"lat":34},{"lng":160.057,"lat":52.755},{"lng":142.5,"lat":41.7},{"lng":143.85,"lat":42.15},{"lng":144,"lat":46},{"lng":136,"lat":36.5},{"lng":-161,"lat":54.5},{"lng":141,"lat":43.8},{"lng":135.6,"lat":33},{"lng":-162.832,"lat":53.492},{"lng":137.2,"lat":34.7},{"lng":137.1,"lat":34},{"lng":156.8,"lat":54.9},{"lng":133.9,"lat":35.3},{"lng":132.1,"lat":32},{"lng":139.5,"lat":44.2},{"lng":178.2,"lat":52},{"lng":139.5,"lat":40.1},{"lng":-158.37,"lat":55.48},{"lng":142.2,"lat":37.5},{"lng":141.7,"lat":37},{"lng":141.7,"lat":37.1},{"lng":141.7,"lat":37.2},{"lng":149.4,"lat":44.5},{"lng":164,"lat":55.2},{"lng":165,"lat":55},{"lng":146.5,"lat":43},{"lng":144.622,"lat":39.224},{"lng":131.5,"lat":32},{"lng":139.2,"lat":36.1},{"lng":142.5,"lat":40.5},{"lng":139,"lat":35},{"lng":171.5,"lat":52.5},{"lng":-170,"lat":51},{"lng":154.8,"lat":49.8},{"lng":160.039,"lat":55.663},{"lng":135.1,"lat":35.6},{"lng":147.416,"lat":44.737},{"lng":140.2,"lat":34.9},{"lng":139.5,"lat":35.1},{"lng":162.5,"lat":56.5},{"lng":162.4,"lat":55},{"lng":161,"lat":54},{"lng":151.8,"lat":47},{"lng":145.5,"lat":40.5},{"lng":151.5,"lat":44.5},{"lng":151.5,"lat":45.5},{"lng":136.5,"lat":45.4},{"lng":131,"lat":42.5},{"lng":-169.12,"lat":54.79},{"lng":163,"lat":56.5},{"lng":160,"lat":46.5},{"lng":141,"lat":33},{"lng":-170,"lat":53.3},{"lng":178.5,"lat":48.5},{"lng":131.5,"lat":29.5},{"lng":142.9,"lat":38.3},{"lng":163.3,"lat":53.5},{"lng":155,"lat":47},{"lng":143,"lat":22},{"lng":139.8,"lat":39.2},{"lng":130.67,"lat":31.58},{"lng":155.5,"lat":47.5},{"lng":152,"lat":46},{"lng":-155,"lat":57.5},{"lng":130,"lat":28},{"lng":156,"lat":51.8},{"lng":145,"lat":42},{"lng":138.5,"lat":33},{"lng":131,"lat":32},{"lng":175,"lat":52},{"lng":141.5,"lat":34.5},{"lng":150,"lat":45},{"lng":-169.73,"lat":52.59},{"lng":147,"lat":51.5}]

run:

hull(pointset, 100, ['.lng', '.lat'])

Result:

Thanks

Wrong border

As you can see in console it Hull.js input and output points.
wrong border in result

Removing unncecessarry points

I am using region-growing / flood to detect an area of interest and then create a polygon from it. In order to do that I use hull.js to 1) get rid of useless/internal points and 2) sort the points so that the polygon can be drawn.

Is it possible to remove useless points (e.g. three points on a line next to each other) while computing a hull? Usually, the result left there most of the points, although many can be discarded, the output of region growing usually looks something like this:

   ***   ****
   *   **      *
   *        ****
   * *****

Example:
points: 40 (from region growing)
hull.js output: 34
important points: 12 (removed using neighborhood closeness and coordinate equality comparison)

Sure I can iterate the points afterward and remove consecutive ones with the same coordinate, but usually convex hulls do not include such points ... Although IDK about this version of 'loose' hull implementation (which is really awesome, exactly what I needed 😄 )

Thanks

Incorrect hull

Hi!
Nice lib, but build incorrect hull with my data. For example:
Points:
[{"ID":2002000186,"NAME":"098-04","X":25981.376,"Y":11051.213,"TIP":4},{"ID":31561,"NAME":"100-05","X":25761.408,"Y":11046.881,"TIP":4},{"ID":31563,"NAME":"100-06","X":25732.067,"Y":11004.886,"TIP":4},{"ID":31565,"NAME":"100-07","X":25717.202,"Y":10959.749,"TIP":4},{"ID":31567,"NAME":"100-08","X":25697.616,"Y":10908.957,"TIP":4},{"ID":31569,"NAME":"100-09","X":25671.435,"Y":10870.342,"TIP":4},{"ID":31571,"NAME":"100-10","X":25650.06,"Y":10826.486,"TIP":4},{"ID":31573,"NAME":"100-11","X":25626.154,"Y":10777.455,"TIP":4},{"ID":31593,"NAME":"102-07","X":25515.503,"Y":11001.201,"TIP":4},{"ID":31595,"NAME":"102-08","X":25490.95,"Y":10954.007,"TIP":4},{"ID":31597,"NAME":"102-09","X":25468.686,"Y":10907.581,"TIP":4},{"ID":31599,"NAME":"102-10","X":25450.669,"Y":10861.13,"TIP":4},{"ID":31601,"NAME":"102-11","X":25422.485,"Y":10819.644,"TIP":4}]

Build width: hull(arrPoints, Infinity);

Result:

When will the auto concavity be implemented?

is the auto concavity feature planned in the near future release?

wikipedia

Does implementation has any link to this?
https://en.wikibooks.org/wiki/Algorithm_Implementation/Geometry/Convex_hull/Monotone_chain

Hull when multiple outline points are on the same Y axis

Hi there,

I hope this is still maintained somehow.
How does the algorithm handle this Shape:

var test = [
new Point(0,0),
new Point(100,0),
new Point(100,200),
new Point(100,300),
new Point(100,400),
new Point(0,400),
// new Point(0,300),
// new Point(0,200)
]

This will produce a shape where the points on the right side are used twice.
If you uncomment the the other two points it's correct.
I am using this library in a project to get contours from 3D objects.
So far it seems like I have to get min and max X points and remove points on Y axis between minY and maxY on left and right Y axis border.

Is there a way to handle that initially?

Best regards

Kevin

Hull hangs running

Hi there!

I'm testing hull() and passing this pointset the algo hangs (I cancelled run after 10 minutes running without success). Other pointsets (even bigger) are successfully returning a hull. So not sure if the problem is with the data but don't know how to check. Can you help me please?

I'm running on node v8.

Thanks

hangs.txt

Arbitrary Polygons?

Hello,
I have a set of arbitrarily-scaled polygons that I wish to create concave hulls from.
They may be very large or very small. My application is not related to geo-coordinates.

Question is, what scale do you recommend for your algorithm to achieve an optimum concave hull?
In other words, what is too large, and what is too small?

Also, my shapes may have 90 degree angles that I wish to restore. An example of this would be the block letter 'E'.
Are 90 degree corners allowed by your algorithm? Can they be easily restored from a convex hull? The shapes may have a small number of points, so I would guess that would depend on the amount of detail. Thanks.

C++ port

Hi Andrii,

first of all, awesome job, this library is fantastic. I needed it on cpp so I just ported it and I wanted you to know, let me know if I messed up with the license as I clearly want to give you attribution.

Thanks!

concavity does not have any effect on my set of points 😢😢😢😢😢😢😢😢

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[71.6418782, 29.3799967], [71.6418666, 29.3799953], [71.6418553, 29.3799919], [71.6418405, 29.3799862], [71.6418253, 29.37998], [71.6418166, 29.3799774], [71.6418071, 29.3799753], [71.6418071, 29.3799753], [71.6418071, 29.3799753], [71.6418071, 29.3799753]];
			
var p = hull(points, 10); // returns points of the hull (in clockwise order)
console.log(JSON.stringify(p))

ReferenceError: hull is not defined

Excuse me,I am new to java.After building this project,how can I use the hull library?
Thanks a lot.