diff --git a/geojson/FeatureCollection.geojson b/fixtures/FeatureCollection.geojson similarity index 100% rename from geojson/FeatureCollection.geojson rename to fixtures/FeatureCollection.geojson diff --git a/fixtures/LineString.geojson b/fixtures/LineString.geojson new file mode 100644 index 0000000..991f184 --- /dev/null +++ b/fixtures/LineString.geojson @@ -0,0 +1,41 @@ +{ + "type": "Feature", + "properties": {}, + "geometry": { + "type": "LineString", + "coordinates": [ + [ + -58.45962524414062, + -34.5286213832762 + ], + [ + -58.50151062011719, + -34.54841811625336 + ], + [ + -58.531723022460945, + -34.61625687562895 + ], + [ + -58.530349731445305, + -34.65523908026755 + ], + [ + -58.45550537109375, + -34.70831578223845 + ], + [ + -58.41636657714844, + -34.65806316573297 + ], + [ + -58.363494873046875, + -34.651285198954135 + ], + [ + -58.34564208984375, + -34.62925297943919 + ] + ] + } +} \ No newline at end of file diff --git a/fixtures/MultiPoint.geojson b/fixtures/MultiPoint.geojson new file mode 100644 index 0000000..f0b69d0 --- /dev/null +++ b/fixtures/MultiPoint.geojson @@ -0,0 +1,21 @@ +{ + "type": "Feature", + "properties": {}, + "geometry": { + "type": "MultiPoint", + "coordinates": [ + [ + -89.43283081054688, + 43.07089421067248 + ], + [ + -89.37103271484375, + 43.08456131144392 + ], + [ + -89.329833984375, + 43.107249487936684 + ] + ] + } +} \ No newline at end of file diff --git a/geojson/Point.geojson b/fixtures/Point.geojson similarity index 100% rename from geojson/Point.geojson rename to fixtures/Point.geojson diff --git a/geojson/Polygon.geojson b/fixtures/Polygon.geojson similarity index 100% rename from geojson/Polygon.geojson rename to fixtures/Polygon.geojson diff --git a/fixtures/out/multipoint.geojson b/fixtures/out/multipoint.geojson new file mode 100644 index 0000000..363754e --- /dev/null +++ b/fixtures/out/multipoint.geojson @@ -0,0 +1 @@ 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A","category":"Store"}}]} \ No newline at end of file diff --git a/geojson/LineString.geojson b/geojson/LineString.geojson deleted file mode 100644 index 152c448..0000000 --- a/geojson/LineString.geojson +++ /dev/null @@ -1 +0,0 @@ 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\ No newline at end of file diff --git a/index.js b/index.js index 2529176..9d2e124 100644 --- a/index.js +++ b/index.js @@ -1,63 +1,98 @@ -// http://stackoverflow.com/questions/839899/how-do-i-calculate-a-point-on-a-circles-circumference -// radians = degrees * (pi/180) -// https://github.com/bjornharrtell/jsts/blob/master/examples/buffer.html - -var featurecollection = require('turf-featurecollection') -var polygon = require('turf-polygon') -var combine = require('turf-combine') -var jsts = require('jsts') - -module.exports = function(feature, radius, units, done){ - var buffered; - - done = done || function () {}; - - switch(units){ - case 'miles': - radius = radius / 69.047 - break - case 'kilometers': - radius = radius / 111.12 - break - case 'degrees': - break - } +var featurecollection = require('turf-featurecollection'); +var destination = require('turf-destination'); +var bearing = require('turf-bearing'); +var point = require('turf-point'); +var polygon = require('turf-polygon'); - if(feature.type === 'FeatureCollection'){ - var multi = combine(feature); - multi.properties = {} +module.exports = function(feature, radius, units, resolution){ + if(!resolution) resolution = 36; + var geom = feature.geometry + if(geom.type === 'Point') { + return pointBuffer(feature, radius, units, resolution); + } else if(geom.type === 'MultiPoint') { + var buffers = []; + geom.coordinates.forEach(function(coords) { + buffers.push(pointBuffer(point(coords[0], coords[1]), radius, units, resolution)); + }); + return featurecollection(buffers) + } else if(geom.type === 'LineString') { + return lineBuffer(feature, radius, units, resolution); + } else if(geom.type === 'MultiLineString') { + var buffers = []; + geom.coordinates.forEach(function(line){ + buffers.push(lineBuffer(feature, radius, units, resolution)); + }); + } else if(geom.type === 'Polygon') { - buffered = bufferOp(multi, radius); + } else if(geom.type === 'MultiPolygon') { - done(null, buffered); - return buffered; - } - else{ - buffered = bufferOp(feature, radius); - - done(null, buffered); - return buffered; } } -var bufferOp = function(feature, radius){ - var reader = new jsts.io.GeoJSONReader() - var geom = reader.read(JSON.stringify(feature.geometry)) - var buffered = geom.buffer(radius); - var parser = new jsts.io.GeoJSONParser() - buffered = parser.write(buffered) - - if(buffered.type === 'MultiPolygon'){ - buffered = { - type: 'Feature', - geometry: buffered, - properties: {} - } - buffered = featurecollection([buffered]) +function pointBuffer (pt, radius, units, resolution) { + var ring = [] + var resMultiple = 360/resolution; + for(var i = 0; i < resolution; i++) { + var spoke = destination(pt, radius, i*resMultiple, units); + ring.push(spoke.geometry.coordinates); + } + if((ring[0][0] !== ring[ring.length-1][0]) && (ring[0][1] != ring[ring.length-1][1])) { + ring.push([ring[0][0], ring[0][1]]); } - else{ - buffered = featurecollection([polygon(buffered.coordinates)]) + return polygon([ring]) +} + +function lineBuffer (line, radius, units, resolution) { + var lineBuffers = featurecollection([]) + //break line into segments + var segments = []; + for(var i = 0; i < line.geometry.coordinates.length-1; i++) { + segments.push([line.geometry.coordinates[i], line.geometry.coordinates[i+1]]); } + /*create a set of boxes parallel to the segments + + --------- + + ((|¯¯¯¯¯¯¯¯¯|)) +(((|---------|))) + ((|_________|)) + + */ + for(var i = 0; i < segments.length; i++) { + var bottom = point(segments[i][0][0], segments[i][0][1]) + var top = point(segments[i][1][0], segments[i][1][1]) - return buffered; + var direction = bearing(bottom, top); + + var bottomLeft = destination(bottom, radius, direction - 90, units); + var bottomRight = destination(bottom, radius, direction + 90, units); + var topLeft = destination(top, radius, direction - 90, units); + var topRight = destination(top, radius, direction + 90, units); + + var poly = polygon([[bottomLeft.geometry.coordinates, topLeft.geometry.coordinates]]); + + // add top curve + var spokeNum = Math.floor(resolution/2); + var topStart = bearing(top, topLeft); + for(var k = 1; k < spokeNum; k++) { + var spokeDirection = topStart + (180 * (k/spokeNum)) + var spoke = destination(top, radius, spokeDirection, units); + poly.geometry.coordinates[0].push(spoke.geometry.coordinates); + } + // add right edge + poly.geometry.coordinates[0].push(topRight.geometry.coordinates) + poly.geometry.coordinates[0].push(bottomRight.geometry.coordinates) + //add bottom curve + var bottomStart = bearing(bottom, bottomRight); + for(var k = 1; k < spokeNum; k++) { + var spokeDirection = (bottomStart + (180 * (k/spokeNum))) + var spoke = destination(bottom, radius, spokeDirection, units); + poly.geometry.coordinates[0].push(spoke.geometry.coordinates); + } + + poly.geometry.coordinates[0].push(bottomLeft.geometry.coordinates) + lineBuffers.features.push(poly); + } + console.log(JSON.stringify(lineBuffers)) + return lineBuffers; } \ No newline at end of file diff --git a/package.json b/package.json index 914cc21..f6bbdf3 100644 --- a/package.json +++ b/package.json @@ -29,9 +29,10 @@ "tape": "^2.13.3" }, "dependencies": { - "jsts": "^0.13.4", - "turf-combine": "0.1.0", + "turf-bearing": "0.0.2", + "turf-destination": "0.0.5", "turf-featurecollection": "^0.1.0", + "turf-point": "^0.1.6", "turf-polygon": "^0.1.1" } } diff --git a/test.js b/test.js index 852b42b..18da7f9 100644 --- a/test.js +++ b/test.js @@ -1,22 +1,30 @@ -var test = require('tape') -var buffer = require('./') -var fs = require('fs') +var test = require('tape'); +var buffer = require('./'); +var fs = require('fs'); +var fc = require('turf-featurecollection') test('buffer', function(t){ - var pt = JSON.parse(fs.readFileSync(__dirname+'/geojson/Point.geojson')) - var line = JSON.parse(fs.readFileSync(__dirname+'/geojson/LineString.geojson')) - var polygon = JSON.parse(fs.readFileSync(__dirname+'/geojson/Polygon.geojson')) - var fc = JSON.parse(fs.readFileSync(__dirname+'/geojson/FeatureCollection.geojson')) + var pt = JSON.parse(fs.readFileSync(__dirname+'/fixtures/Point.geojson')); + var multipt = JSON.parse(fs.readFileSync(__dirname+'/fixtures/MultiPoint.geojson')); + var line = JSON.parse(fs.readFileSync(__dirname+'/fixtures/LineString.geojson')); + var polygon = JSON.parse(fs.readFileSync(__dirname+'/fixtures/Polygon.geojson')); - var buffPt = buffer(pt, 10, 'miles') - var buffLine = buffer(pt, 10, 'miles') - var buffPoly = buffer(pt, 10, 'miles') - var buffFC = buffer(fc, 10, 'miles') + var buffPt = buffer(pt, 10, 'miles', 1000); + fs.writeFileSync(__dirname+'/fixtures/out/point.geojson', JSON.stringify(fc([buffPt, pt]))); + var buffMultiPt = buffer(multipt, 10, 'miles', 100); + buffMultiPt.features.push(multipt) + fs.writeFileSync(__dirname+'/fixtures/out/multipoint.geojson', JSON.stringify(buffMultiPt)); + var buffLine = buffer(line, 0.4, 'miles'); + buffLine.features.push(line) + fs.writeFileSync(__dirname+'/fixtures/out/linestring.geojson', JSON.stringify(buffLine)); + //var buffPoly = buffer(pt, 10, 'miles'); + //var buffFC = buffer(fc, 10, 'miles'); - t.ok(buffPt, 'should buffer a point') - t.ok(buffLine, 'should buffer a line') - t.ok(buffPoly, 'should buffer a polygon') - t.ok(buffFC, 'should buffer featurecollection') + t.ok(buffPt, 'should buffer a point'); + t.ok(buffMultiPt, 'should buffer a multipoint'); + t.ok(buffLine, 'should buffer a line'); + //t.ok(buffPoly, 'should buffer a polygon'); + //t.ok(buffFC, 'should buffer featurecollection'); - t.end() -}) \ No newline at end of file + t.end(); +}); \ No newline at end of file