geojson-vt-dev.js

(function(f){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=f()}else if(typeof define==="function"&&define.amd){define([],f)}else{var g;if(typeof window!=="undefined"){g=window}else if(typeof global!=="undefined"){g=global}else if(typeof self!=="undefined"){g=self}else{g=this}g.geojsonvt = f()}})(function(){var define,module,exports;return (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
'use strict';

module.exports = clip;

/* clip features between two axis-parallel lines:
 *     |        |
 *  ___|___     |     /
 * /   |   \____|____/
 *     |        |
 */

function clip(features, scale, k1, k2, axis, intersect, minAll, maxAll) {

    k1 /= scale;
    k2 /= scale;

    if (minAll >= k1 && maxAll <= k2) return features; // trivial accept
    else if (minAll > k2 || maxAll < k1) return null; // trivial reject

    var clipped = [];

    for (var i = 0; i < features.length; i++) {

        var feature = features[i],
            geometry = feature.geometry,
            type = feature.type,
            min, max;

        min = feature.min[axis];
        max = feature.max[axis];

        if (min >= k1 && max <= k2) { // trivial accept
            clipped.push(feature);
            continue;
        } else if (min > k2 || max < k1) continue; // trivial reject

        var slices = type === 1 ?
                clipPoints(geometry, k1, k2, axis) :
                clipGeometry(geometry, k1, k2, axis, intersect, type === 3);

        if (slices.length) {
            // if a feature got clipped, it will likely get clipped on the next zoom level as well,
            // so there's no need to recalculate bboxes
            clipped.push({
                geometry: slices,
                type: type,
                tags: features[i].tags || null,
                min: feature.min,
                max: feature.max
            });
        }
    }

    return clipped.length ? clipped : null;
}

function clipPoints(geometry, k1, k2, axis) {
    var slice = [];

    for (var i = 0; i < geometry.length; i++) {
        var a = geometry[i],
            ak = a[axis];

        if (ak >= k1 && ak <= k2) slice.push(a);
    }
    return slice;
}

function clipGeometry(geometry, k1, k2, axis, intersect, closed) {

    var slices = [];

    for (var i = 0; i < geometry.length; i++) {

        var ak = 0,
            bk = 0,
            b = null,
            points = geometry[i],
            area = points.area,
            dist = points.dist,
            len = points.length,
            a, j, last;

        var slice = [];

        for (j = 0; j < len - 1; j++) {
            a = b || points[j];
            b = points[j + 1];
            ak = bk || a[axis];
            bk = b[axis];

            if (ak < k1) {

                if ((bk > k2)) { // ---|-----|-->
                    slice.push(intersect(a, b, k1), intersect(a, b, k2));
                    if (!closed) slice = newSlice(slices, slice, area, dist);

                } else if (bk >= k1) slice.push(intersect(a, b, k1)); // ---|-->  |

            } else if (ak > k2) {

                if ((bk < k1)) { // <--|-----|---
                    slice.push(intersect(a, b, k2), intersect(a, b, k1));
                    if (!closed) slice = newSlice(slices, slice, area, dist);

                } else if (bk <= k2) slice.push(intersect(a, b, k2)); // |  <--|---

            } else {

                slice.push(a);

                if (bk < k1) { // <--|---  |
                    slice.push(intersect(a, b, k1));
                    if (!closed) slice = newSlice(slices, slice, area, dist);

                } else if (bk > k2) { // |  ---|-->
                    slice.push(intersect(a, b, k2));
                    if (!closed) slice = newSlice(slices, slice, area, dist);
                }
                // | --> |
            }
        }

        // add the last point
        a = points[len - 1];
        ak = a[axis];
        if (ak >= k1 && ak <= k2) slice.push(a);

        // close the polygon if its endpoints are not the same after clipping

        last = slice[slice.length - 1];
        if (closed && last && (slice[0][0] !== last[0] || slice[0][1] !== last[1])) slice.push(slice[0]);

        // add the final slice
        newSlice(slices, slice, area, dist);
    }

    return slices;
}

function newSlice(slices, slice, area, dist) {
    if (slice.length) {
        // we don't recalculate the area/length of the unclipped geometry because the case where it goes
        // below the visibility threshold as a result of clipping is rare, so we avoid doing unnecessary work
        slice.area = area;
        slice.dist = dist;

        slices.push(slice);
    }
    return [];
}

},{}],2:[function(require,module,exports){
'use strict';

module.exports = convert;

var simplify = require('./simplify');

// converts GeoJSON feature into an intermediate projected JSON vector format with simplification data

function convert(data, tolerance) {
    var features = [];

    if (data.type === 'FeatureCollection') {
        for (var i = 0; i < data.features.length; i++) {
            convertFeature(features, data.features[i], tolerance);
        }
    } else if (data.type === 'Feature') {
        convertFeature(features, data, tolerance);

    } else {
        // single geometry or a geometry collection
        convertFeature(features, {geometry: data}, tolerance);
    }
    return features;
}

function convertFeature(features, feature, tolerance) {
    if (feature.geometry === null) {
        // ignore features with null geometry
        return;
    }

    var geom = feature.geometry,
        type = geom.type,
        coords = geom.coordinates,
        tags = feature.properties,
        i, j, rings;

    if (type === 'Point') {
        features.push(create(tags, 1, [projectPoint(coords)]));

    } else if (type === 'MultiPoint') {
        features.push(create(tags, 1, project(coords)));

    } else if (type === 'LineString') {
        features.push(create(tags, 2, [project(coords, tolerance)]));

    } else if (type === 'MultiLineString' || type === 'Polygon') {
        rings = [];
        for (i = 0; i < coords.length; i++) {
            rings.push(project(coords[i], tolerance));
        }
        features.push(create(tags, type === 'Polygon' ? 3 : 2, rings));

    } else if (type === 'MultiPolygon') {
        rings = [];
        for (i = 0; i < coords.length; i++) {
            for (j = 0; j < coords[i].length; j++) {
                rings.push(project(coords[i][j], tolerance));
            }
        }
        features.push(create(tags, 3, rings));

    } else if (type === 'GeometryCollection') {
        for (i = 0; i < geom.geometries.length; i++) {
            convertFeature(features, {
                geometry: geom.geometries[i],
                properties: tags
            }, tolerance);
        }

    } else {
        throw new Error('Input data is not a valid GeoJSON object.');
    }
}

function create(tags, type, geometry) {
    var feature = {
        geometry: geometry,
        type: type,
        tags: tags || null,
        min: [2, 1], // initial bbox values;
        max: [-1, 0]  // note that coords are usually in [0..1] range
    };
    calcBBox(feature);
    return feature;
}

function project(lonlats, tolerance) {
    var projected = [];
    for (var i = 0; i < lonlats.length; i++) {
        projected.push(projectPoint(lonlats[i]));
    }
    if (tolerance) {
        simplify(projected, tolerance);
        calcSize(projected);
    }
    return projected;
}

function projectPoint(p) {
    var sin = Math.sin(p[1] * Math.PI / 180),
        x = (p[0] / 360 + 0.5),
        y = (0.5 - 0.25 * Math.log((1 + sin) / (1 - sin)) / Math.PI);

    y = y < 0 ? 0 :
        y > 1 ? 1 : y;

    return [x, y, 0];
}

// calculate area and length of the poly
function calcSize(points) {
    var area = 0,
        dist = 0;

    for (var i = 0, a, b; i < points.length - 1; i++) {
        a = b || points[i];
        b = points[i + 1];

        area += a[0] * b[1] - b[0] * a[1];

        // use Manhattan distance instead of Euclidian one to avoid expensive square root computation
        dist += Math.abs(b[0] - a[0]) + Math.abs(b[1] - a[1]);
    }
    points.area = Math.abs(area / 2);
    points.dist = dist;
}

// calculate the feature bounding box for faster clipping later
function calcBBox(feature) {
    var geometry = feature.geometry,
        min = feature.min,
        max = feature.max;

    if (feature.type === 1) calcRingBBox(min, max, geometry);
    else for (var i = 0; i < geometry.length; i++) calcRingBBox(min, max, geometry[i]);

    return feature;
}

function calcRingBBox(min, max, points) {
    for (var i = 0, p; i < points.length; i++) {
        p = points[i];
        min[0] = Math.min(p[0], min[0]);
        max[0] = Math.max(p[0], max[0]);
        min[1] = Math.min(p[1], min[1]);
        max[1] = Math.max(p[1], max[1]);
    }
}

},{"./simplify":4}],3:[function(require,module,exports){
'use strict';

module.exports = geojsonvt;

var convert = require('./convert'),     // GeoJSON conversion and preprocessing
    transform = require('./transform'), // coordinate transformation
    clip = require('./clip'),           // stripe clipping algorithm
    wrap = require('./wrap'),           // date line processing
    createTile = require('./tile');     // final simplified tile generation


function geojsonvt(data, options) {
    return new GeoJSONVT(data, options);
}

function GeoJSONVT(data, options) {
    options = this.options = extend(Object.create(this.options), options);

    var debug = options.debug;

    if (debug) console.time('preprocess data');

    var z2 = 1 << options.maxZoom, // 2^z
        features = convert(data, options.tolerance / (z2 * options.extent));

    this.tiles = {};
    this.tileCoords = [];

    if (debug) {
        console.timeEnd('preprocess data');
        console.log('index: maxZoom: %d, maxPoints: %d', options.indexMaxZoom, options.indexMaxPoints);
        console.time('generate tiles');
        this.stats = {};
        this.total = 0;
    }

    features = wrap(features, options.buffer / options.extent, intersectX);

    // start slicing from the top tile down
    if (features.length) this.splitTile(features, 0, 0, 0);

    if (debug) {
        if (features.length) console.log('features: %d, points: %d', this.tiles[0].numFeatures, this.tiles[0].numPoints);
        console.timeEnd('generate tiles');
        console.log('tiles generated:', this.total, JSON.stringify(this.stats));
    }
}

GeoJSONVT.prototype.options = {
    maxZoom: 14,            // max zoom to preserve detail on
    indexMaxZoom: 5,        // max zoom in the tile index
    indexMaxPoints: 100000, // max number of points per tile in the tile index
    solidChildren: false,   // whether to tile solid square tiles further
    tolerance: 3,           // simplification tolerance (higher means simpler)
    extent: 4096,           // tile extent
    buffer: 64,             // tile buffer on each side
    debug: 0                // logging level (0, 1 or 2)
};

GeoJSONVT.prototype.splitTile = function (features, z, x, y, cz, cx, cy) {

    var stack = [features, z, x, y],
        options = this.options,
        debug = options.debug,
        solid = null;

    // avoid recursion by using a processing queue
    while (stack.length) {
        y = stack.pop();
        x = stack.pop();
        z = stack.pop();
        features = stack.pop();

        var z2 = 1 << z,
            id = toID(z, x, y),
            tile = this.tiles[id],
            tileTolerance = z === options.maxZoom ? 0 : options.tolerance / (z2 * options.extent);

        if (!tile) {
            if (debug > 1) console.time('creation');

            tile = this.tiles[id] = createTile(features, z2, x, y, tileTolerance, z === options.maxZoom);
            this.tileCoords.push({z: z, x: x, y: y});

            if (debug) {
                if (debug > 1) {
                    console.log('tile z%d-%d-%d (features: %d, points: %d, simplified: %d)',
                        z, x, y, tile.numFeatures, tile.numPoints, tile.numSimplified);
                    console.timeEnd('creation');
                }
                var key = 'z' + z;
                this.stats[key] = (this.stats[key] || 0) + 1;
                this.total++;
            }
        }

        // save reference to original geometry in tile so that we can drill down later if we stop now
        tile.source = features;

        // if it's the first-pass tiling
        if (!cz) {
            // stop tiling if we reached max zoom, or if the tile is too simple
            if (z === options.indexMaxZoom || tile.numPoints <= options.indexMaxPoints) continue;

        // if a drilldown to a specific tile
        } else {
            // stop tiling if we reached base zoom or our target tile zoom
            if (z === options.maxZoom || z === cz) continue;

            // stop tiling if it's not an ancestor of the target tile
            var m = 1 << (cz - z);
            if (x !== Math.floor(cx / m) || y !== Math.floor(cy / m)) continue;
        }

        // stop tiling if the tile is solid clipped square
        if (!options.solidChildren && isClippedSquare(tile, options.extent, options.buffer)) {
            if (cz) solid = z; // and remember the zoom if we're drilling down
            continue;
        }

        // if we slice further down, no need to keep source geometry
        tile.source = null;

        if (debug > 1) console.time('clipping');

        // values we'll use for clipping
        var k1 = 0.5 * options.buffer / options.extent,
            k2 = 0.5 - k1,
            k3 = 0.5 + k1,
            k4 = 1 + k1,
            tl, bl, tr, br, left, right;

        tl = bl = tr = br = null;

        left  = clip(features, z2, x - k1, x + k3, 0, intersectX, tile.min[0], tile.max[0]);
        right = clip(features, z2, x + k2, x + k4, 0, intersectX, tile.min[0], tile.max[0]);

        if (left) {
            tl = clip(left, z2, y - k1, y + k3, 1, intersectY, tile.min[1], tile.max[1]);
            bl = clip(left, z2, y + k2, y + k4, 1, intersectY, tile.min[1], tile.max[1]);
        }

        if (right) {
            tr = clip(right, z2, y - k1, y + k3, 1, intersectY, tile.min[1], tile.max[1]);
            br = clip(right, z2, y + k2, y + k4, 1, intersectY, tile.min[1], tile.max[1]);
        }

        if (debug > 1) console.timeEnd('clipping');

        if (tl) stack.push(tl, z + 1, x * 2,     y * 2);
        if (bl) stack.push(bl, z + 1, x * 2,     y * 2 + 1);
        if (tr) stack.push(tr, z + 1, x * 2 + 1, y * 2);
        if (br) stack.push(br, z + 1, x * 2 + 1, y * 2 + 1);
    }

    return solid;
};

GeoJSONVT.prototype.getTile = function (z, x, y) {
    var options = this.options,
        extent = options.extent,
        debug = options.debug;

    var z2 = 1 << z;
    x = ((x % z2) + z2) % z2; // wrap tile x coordinate

    var id = toID(z, x, y);
    if (this.tiles[id]) return transform.tile(this.tiles[id], extent);

    if (debug > 1) console.log('drilling down to z%d-%d-%d', z, x, y);

    var z0 = z,
        x0 = x,
        y0 = y,
        parent;

    while (!parent && z0 > 0) {
        z0--;
        x0 = Math.floor(x0 / 2);
        y0 = Math.floor(y0 / 2);
        parent = this.tiles[toID(z0, x0, y0)];
    }

    if (!parent || !parent.source) return null;

    // if we found a parent tile containing the original geometry, we can drill down from it
    if (debug > 1) console.log('found parent tile z%d-%d-%d', z0, x0, y0);

    // it parent tile is a solid clipped square, return it instead since it's identical
    if (isClippedSquare(parent, extent, options.buffer)) return transform.tile(parent, extent);

    if (debug > 1) console.time('drilling down');
    var solid = this.splitTile(parent.source, z0, x0, y0, z, x, y);
    if (debug > 1) console.timeEnd('drilling down');

    // one of the parent tiles was a solid clipped square
    if (solid !== null) {
        var m = 1 << (z - solid);
        id = toID(solid, Math.floor(x / m), Math.floor(y / m));
    }

    return this.tiles[id] ? transform.tile(this.tiles[id], extent) : null;
};

function toID(z, x, y) {
    return (((1 << z) * y + x) * 32) + z;
}

function intersectX(a, b, x) {
    return [x, (x - a[0]) * (b[1] - a[1]) / (b[0] - a[0]) + a[1], 1];
}
function intersectY(a, b, y) {
    return [(y - a[1]) * (b[0] - a[0]) / (b[1] - a[1]) + a[0], y, 1];
}

function extend(dest, src) {
    for (var i in src) dest[i] = src[i];
    return dest;
}

// checks whether a tile is a whole-area fill after clipping; if it is, there's no sense slicing it further
function isClippedSquare(tile, extent, buffer) {

    var features = tile.source;
    if (features.length !== 1) return false;

    var feature = features[0];
    if (feature.type !== 3 || feature.geometry.length > 1) return false;

    var len = feature.geometry[0].length;
    if (len !== 5) return false;

    for (var i = 0; i < len; i++) {
        var p = transform.point(feature.geometry[0][i], extent, tile.z2, tile.x, tile.y);
        if ((p[0] !== -buffer && p[0] !== extent + buffer) ||
            (p[1] !== -buffer && p[1] !== extent + buffer)) return false;
    }

    return true;
}

},{"./clip":1,"./convert":2,"./tile":5,"./transform":6,"./wrap":7}],4:[function(require,module,exports){
'use strict';

module.exports = simplify;

// calculate simplification data using optimized Douglas-Peucker algorithm

function simplify(points, tolerance) {

    var sqTolerance = tolerance * tolerance,
        len = points.length,
        first = 0,
        last = len - 1,
        stack = [],
        i, maxSqDist, sqDist, index;

    // always retain the endpoints (1 is the max value)
    points[first][2] = 1;
    points[last][2] = 1;

    // avoid recursion by using a stack
    while (last) {

        maxSqDist = 0;

        for (i = first + 1; i < last; i++) {
            sqDist = getSqSegDist(points[i], points[first], points[last]);

            if (sqDist > maxSqDist) {
                index = i;
                maxSqDist = sqDist;
            }
        }

        if (maxSqDist > sqTolerance) {
            points[index][2] = maxSqDist; // save the point importance in squared pixels as a z coordinate
            stack.push(first);
            stack.push(index);
            first = index;

        } else {
            last = stack.pop();
            first = stack.pop();
        }
    }
}

// square distance from a point to a segment
function getSqSegDist(p, a, b) {

    var x = a[0], y = a[1],
        bx = b[0], by = b[1],
        px = p[0], py = p[1],
        dx = bx - x,
        dy = by - y;

    if (dx !== 0 || dy !== 0) {

        var t = ((px - x) * dx + (py - y) * dy) / (dx * dx + dy * dy);

        if (t > 1) {
            x = bx;
            y = by;

        } else if (t > 0) {
            x += dx * t;
            y += dy * t;
        }
    }

    dx = px - x;
    dy = py - y;

    return dx * dx + dy * dy;
}

},{}],5:[function(require,module,exports){
'use strict';

module.exports = createTile;

function createTile(features, z2, tx, ty, tolerance, noSimplify) {
    var tile = {
        features: [],
        numPoints: 0,
        numSimplified: 0,
        numFeatures: 0,
        source: null,
        x: tx,
        y: ty,
        z2: z2,
        transformed: false,
        min: [2, 1],
        max: [-1, 0]
    };
    for (var i = 0; i < features.length; i++) {
        tile.numFeatures++;
        addFeature(tile, features[i], tolerance, noSimplify);

        var min = features[i].min,
            max = features[i].max;

        if (min[0] < tile.min[0]) tile.min[0] = min[0];
        if (min[1] < tile.min[1]) tile.min[1] = min[1];
        if (max[0] > tile.max[0]) tile.max[0] = max[0];
        if (max[1] > tile.max[1]) tile.max[1] = max[1];
    }
    return tile;
}

function addFeature(tile, feature, tolerance, noSimplify) {

    var geom = feature.geometry,
        type = feature.type,
        simplified = [],
        sqTolerance = tolerance * tolerance,
        i, j, ring, p;

    if (type === 1) {
        for (i = 0; i < geom.length; i++) {
            simplified.push(geom[i]);
            tile.numPoints++;
            tile.numSimplified++;
        }

    } else {

        // simplify and transform projected coordinates for tile geometry
        for (i = 0; i < geom.length; i++) {
            ring = geom[i];

            // filter out tiny polylines & polygons
            if (!noSimplify && ((type === 2 && ring.dist < tolerance) ||
                                (type === 3 && ring.area < sqTolerance))) {
                tile.numPoints += ring.length;
                continue;
            }

            var simplifiedRing = [];

            for (j = 0; j < ring.length; j++) {
                p = ring[j];
                // keep points with importance > tolerance
                if (noSimplify || p[2] > sqTolerance) {
                    simplifiedRing.push(p);
                    tile.numSimplified++;
                }
                tile.numPoints++;
            }

            simplified.push(simplifiedRing);
        }
    }

    if (simplified.length) {
        tile.features.push({
            geometry: simplified,
            type: type,
            tags: feature.tags || null
        });
    }
}

},{}],6:[function(require,module,exports){
'use strict';

exports.tile = transformTile;
exports.point = transformPoint;

// Transforms the coordinates of each feature in the given tile from
// mercator-projected space into (extent x extent) tile space.
function transformTile(tile, extent) {
    if (tile.transformed) return tile;

    var z2 = tile.z2,
        tx = tile.x,
        ty = tile.y,
        i, j, k;

    for (i = 0; i < tile.features.length; i++) {
        var feature = tile.features[i],
            geom = feature.geometry,
            type = feature.type;

        if (type === 1) {
            for (j = 0; j < geom.length; j++) geom[j] = transformPoint(geom[j], extent, z2, tx, ty);

        } else {
            for (j = 0; j < geom.length; j++) {
                var ring = geom[j];
                for (k = 0; k < ring.length; k++) ring[k] = transformPoint(ring[k], extent, z2, tx, ty);
            }
        }
    }

    tile.transformed = true;

    return tile;
}

function transformPoint(p, extent, z2, tx, ty) {
    var x = Math.round(extent * (p[0] * z2 - tx)),
        y = Math.round(extent * (p[1] * z2 - ty));
    return [x, y];
}

},{}],7:[function(require,module,exports){
'use strict';

var clip = require('./clip');

module.exports = wrap;

function wrap(features, buffer, intersectX) {
    var merged = features,
        left  = clip(features, 1, -1 - buffer, buffer,     0, intersectX, -1, 2), // left world copy
        right = clip(features, 1,  1 - buffer, 2 + buffer, 0, intersectX, -1, 2); // right world copy

    if (left || right) {
        merged = clip(features, 1, -buffer, 1 + buffer, 0, intersectX, -1, 2); // center world copy

        if (left) merged = shiftFeatureCoords(left, 1).concat(merged); // merge left into center
        if (right) merged = merged.concat(shiftFeatureCoords(right, -1)); // merge right into center
    }

    return merged;
}

function shiftFeatureCoords(features, offset) {
    var newFeatures = [];

    for (var i = 0; i < features.length; i++) {
        var feature = features[i],
            type = feature.type;

        var newGeometry;

        if (type === 1) {
            newGeometry = shiftCoords(feature.geometry, offset);
        } else {
            newGeometry = [];
            for (var j = 0; j < feature.geometry.length; j++) {
                newGeometry.push(shiftCoords(feature.geometry[j], offset));
            }
        }

        newFeatures.push({
            geometry: newGeometry,
            type: type,
            tags: feature.tags,
            min: [feature.min[0] + offset, feature.min[1]],
            max: [feature.max[0] + offset, feature.max[1]]
        });
    }

    return newFeatures;
}

function shiftCoords(points, offset) {
    var newPoints = [];
    newPoints.area = points.area;
    newPoints.dist = points.dist;

    for (var i = 0; i < points.length; i++) {
        newPoints.push([points[i][0] + offset, points[i][1], points[i][2]]);
    }
    return newPoints;
}

},{"./clip":1}]},{},[3])(3)
});
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e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require==\"function\"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error(\"Cannot find module '\"+o+\"'\");throw f.code=\"MODULE_NOT_FOUND\",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require==\"function\"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})","'use strict';\n\nmodule.exports = clip;\n\n/* clip features between two axis-parallel lines:\n *     |        |\n *  ___|___     |     /\n * /   |   \\____|____/\n *     |        |\n */\n\nfunction clip(features, scale, k1, k2, axis, intersect, minAll, maxAll) {\n\n    k1 /= scale;\n    k2 /= scale;\n\n    if (minAll >= k1 && maxAll <= k2) return features; // trivial accept\n    else if (minAll > k2 || maxAll < k1) return null; // trivial reject\n\n    var clipped = [];\n\n    for (var i = 0; i < features.length; i++) {\n\n        var feature = features[i],\n            geometry = feature.geometry,\n            type = feature.type,\n            min, max;\n\n        min = feature.min[axis];\n        max = feature.max[axis];\n\n        if (min >= k1 && max <= k2) { // trivial accept\n            clipped.push(feature);\n            continue;\n        } else if (min > k2 || max < k1) continue; // trivial reject\n\n        var slices = type === 1 ?\n                clipPoints(geometry, k1, k2, axis) :\n                clipGeometry(geometry, k1, k2, axis, intersect, type === 3);\n\n        if (slices.length) {\n            // if a feature got clipped, it will likely get clipped on the next zoom level as well,\n            // so there's no need to recalculate bboxes\n            clipped.push({\n                geometry: slices,\n                type: type,\n                tags: features[i].tags || null,\n                min: feature.min,\n                max: feature.max\n            });\n        }\n    }\n\n    return clipped.length ? clipped : null;\n}\n\nfunction clipPoints(geometry, k1, k2, axis) {\n    var slice = [];\n\n    for (var i = 0; i < geometry.length; i++) {\n        var a = geometry[i],\n            ak = a[axis];\n\n        if (ak >= k1 && ak <= k2) slice.push(a);\n    }\n    return slice;\n}\n\nfunction clipGeometry(geometry, k1, k2, axis, intersect, closed) {\n\n    var slices = [];\n\n    for (var i = 0; i < geometry.length; i++) {\n\n        var ak = 0,\n            bk = 0,\n            b = null,\n            points = geometry[i],\n            area = points.area,\n            dist = points.dist,\n            len = points.length,\n            a, j, last;\n\n        var slice = [];\n\n        for (j = 0; j < len - 1; j++) {\n            a = b || points[j];\n            b = points[j + 1];\n            ak = bk || a[axis];\n            bk = b[axis];\n\n            if (ak < k1) {\n\n                if ((bk > k2)) { // ---|-----|-->\n                    slice.push(intersect(a, b, k1), intersect(a, b, k2));\n                    if (!closed) slice = newSlice(slices, slice, area, dist);\n\n                } else if (bk >= k1) slice.push(intersect(a, b, k1)); // ---|-->  |\n\n            } else if (ak > k2) {\n\n                if ((bk < k1)) { // <--|-----|---\n                    slice.push(intersect(a, b, k2), intersect(a, b, k1));\n                    if (!closed) slice = newSlice(slices, slice, area, dist);\n\n                } else if (bk <= k2) slice.push(intersect(a, b, k2)); // |  <--|---\n\n            } else {\n\n                slice.push(a);\n\n                if (bk < k1) { // <--|---  |\n                    slice.push(intersect(a, b, k1));\n                    if (!closed) slice = newSlice(slices, slice, area, dist);\n\n                } else if (bk > k2) { // |  ---|-->\n                    slice.push(intersect(a, b, k2));\n                    if (!closed) slice = newSlice(slices, slice, area, dist);\n                }\n                // | --> |\n            }\n        }\n\n        // add the last point\n        a = points[len - 1];\n        ak = a[axis];\n        if (ak >= k1 && ak <= k2) slice.push(a);\n\n        // close the polygon if its endpoints are not the same after clipping\n\n        last = slice[slice.length - 1];\n        if (closed && last && (slice[0][0] !== last[0] || slice[0][1] !== last[1])) slice.push(slice[0]);\n\n        // add the final slice\n        newSlice(slices, slice, area, dist);\n    }\n\n    return slices;\n}\n\nfunction newSlice(slices, slice, area, dist) {\n    if (slice.length) {\n        // we don't recalculate the area/length of the unclipped geometry because the case where it goes\n        // below the visibility threshold as a result of clipping is rare, so we avoid doing unnecessary work\n        slice.area = area;\n        slice.dist = dist;\n\n        slices.push(slice);\n    }\n    return [];\n}\n","'use strict';\n\nmodule.exports = convert;\n\nvar simplify = require('./simplify');\n\n// converts GeoJSON feature into an intermediate projected JSON vector format with simplification data\n\nfunction convert(data, tolerance) {\n    var features = [];\n\n    if (data.type === 'FeatureCollection') {\n        for (var i = 0; i < data.features.length; i++) {\n            convertFeature(features, data.features[i], tolerance);\n        }\n    } else if (data.type === 'Feature') {\n        convertFeature(features, data, tolerance);\n\n    } else {\n        // single geometry or a geometry collection\n        convertFeature(features, {geometry: data}, tolerance);\n    }\n    return features;\n}\n\nfunction convertFeature(features, feature, tolerance) {\n    if (feature.geometry === null) {\n        // ignore features with null geometry\n        return;\n    }\n\n    var geom = feature.geometry,\n        type = geom.type,\n        coords = geom.coordinates,\n        tags = feature.properties,\n        i, j, rings;\n\n    if (type === 'Point') {\n        features.push(create(tags, 1, [projectPoint(coords)]));\n\n    } else if (type === 'MultiPoint') {\n        features.push(create(tags, 1, project(coords)));\n\n    } else if (type === 'LineString') {\n        features.push(create(tags, 2, [project(coords, tolerance)]));\n\n    } else if (type === 'MultiLineString' || type === 'Polygon') {\n        rings = [];\n        for (i = 0; i < coords.length; i++) {\n            rings.push(project(coords[i], tolerance));\n        }\n        features.push(create(tags, type === 'Polygon' ? 3 : 2, rings));\n\n    } else if (type === 'MultiPolygon') {\n        rings = [];\n        for (i = 0; i < coords.length; i++) {\n            for (j = 0; j < coords[i].length; j++) {\n                rings.push(project(coords[i][j], tolerance));\n            }\n        }\n        features.push(create(tags, 3, rings));\n\n    } else if (type === 'GeometryCollection') {\n        for (i = 0; i < geom.geometries.length; i++) {\n            convertFeature(features, {\n                geometry: geom.geometries[i],\n                properties: tags\n            }, tolerance);\n        }\n\n    } else {\n        throw new Error('Input data is not a valid GeoJSON object.');\n    }\n}\n\nfunction create(tags, type, geometry) {\n    var feature = {\n        geometry: geometry,\n        type: type,\n        tags: tags || null,\n        min: [2, 1], // initial bbox values;\n        max: [-1, 0]  // note that coords are usually in [0..1] range\n    };\n    calcBBox(feature);\n    return feature;\n}\n\nfunction project(lonlats, tolerance) {\n    var projected = [];\n    for (var i = 0; i < lonlats.length; i++) {\n        projected.push(projectPoint(lonlats[i]));\n    }\n    if (tolerance) {\n        simplify(projected, tolerance);\n        calcSize(projected);\n    }\n    return projected;\n}\n\nfunction projectPoint(p) {\n    var sin = Math.sin(p[1] * Math.PI / 180),\n        x = (p[0] / 360 + 0.5),\n        y = (0.5 - 0.25 * Math.log((1 + sin) / (1 - sin)) / Math.PI);\n\n    y = y < 0 ? 0 :\n        y > 1 ? 1 : y;\n\n    return [x, y, 0];\n}\n\n// calculate area and length of the poly\nfunction calcSize(points) {\n    var area = 0,\n        dist = 0;\n\n    for (var i = 0, a, b; i < points.length - 1; i++) {\n        a = b || points[i];\n        b = points[i + 1];\n\n        area += a[0] * b[1] - b[0] * a[1];\n\n        // use Manhattan distance instead of Euclidian one to avoid expensive square root computation\n        dist += Math.abs(b[0] - a[0]) + Math.abs(b[1] - a[1]);\n    }\n    points.area = Math.abs(area / 2);\n    points.dist = dist;\n}\n\n// calculate the feature bounding box for faster clipping later\nfunction calcBBox(feature) {\n    var geometry = feature.geometry,\n        min = feature.min,\n        max = feature.max;\n\n    if (feature.type === 1) calcRingBBox(min, max, geometry);\n    else for (var i = 0; i < geometry.length; i++) calcRingBBox(min, max, geometry[i]);\n\n    return feature;\n}\n\nfunction calcRingBBox(min, max, points) {\n    for (var i = 0, p; i < points.length; i++) {\n        p = points[i];\n        min[0] = Math.min(p[0], min[0]);\n        max[0] = Math.max(p[0], max[0]);\n        min[1] = Math.min(p[1], min[1]);\n        max[1] = Math.max(p[1], max[1]);\n    }\n}\n","'use strict';\n\nmodule.exports = geojsonvt;\n\nvar convert = require('./convert'),     // GeoJSON conversion and preprocessing\n    transform = require('./transform'), // coordinate transformation\n    clip = require('./clip'),           // stripe clipping algorithm\n    wrap = require('./wrap'),           // date line processing\n    createTile = require('./tile');     // final simplified tile generation\n\n\nfunction geojsonvt(data, options) {\n    return new GeoJSONVT(data, options);\n}\n\nfunction GeoJSONVT(data, options) {\n    options = this.options = extend(Object.create(this.options), options);\n\n    var debug = options.debug;\n\n    if (debug) console.time('preprocess data');\n\n    var z2 = 1 << options.maxZoom, // 2^z\n        features = convert(data, options.tolerance / (z2 * options.extent));\n\n    this.tiles = {};\n    this.tileCoords = [];\n\n    if (debug) {\n        console.timeEnd('preprocess data');\n        console.log('index: maxZoom: %d, maxPoints: %d', options.indexMaxZoom, options.indexMaxPoints);\n        console.time('generate tiles');\n        this.stats = {};\n        this.total = 0;\n    }\n\n    features = wrap(features, options.buffer / options.extent, intersectX);\n\n    // start slicing from the top tile down\n    if (features.length) this.splitTile(features, 0, 0, 0);\n\n    if (debug) {\n        if (features.length) console.log('features: %d, points: %d', this.tiles[0].numFeatures, this.tiles[0].numPoints);\n        console.timeEnd('generate tiles');\n        console.log('tiles generated:', this.total, JSON.stringify(this.stats));\n    }\n}\n\nGeoJSONVT.prototype.options = {\n    maxZoom: 14,            // max zoom to preserve detail on\n    indexMaxZoom: 5,        // max zoom in the tile index\n    indexMaxPoints: 100000, // max number of points per tile in the tile index\n    solidChildren: false,   // whether to tile solid square tiles further\n    tolerance: 3,           // simplification tolerance (higher means simpler)\n    extent: 4096,           // tile extent\n    buffer: 64,             // tile buffer on each side\n    debug: 0                // logging level (0, 1 or 2)\n};\n\nGeoJSONVT.prototype.splitTile = function (features, z, x, y, cz, cx, cy) {\n\n    var stack = [features, z, x, y],\n        options = this.options,\n        debug = options.debug,\n        solid = null;\n\n    // avoid recursion by using a processing queue\n    while (stack.length) {\n        y = stack.pop();\n        x = stack.pop();\n        z = stack.pop();\n        features = stack.pop();\n\n        var z2 = 1 << z,\n            id = toID(z, x, y),\n            tile = this.tiles[id],\n            tileTolerance = z === options.maxZoom ? 0 : options.tolerance / (z2 * options.extent);\n\n        if (!tile) {\n            if (debug > 1) console.time('creation');\n\n            tile = this.tiles[id] = createTile(features, z2, x, y, tileTolerance, z === options.maxZoom);\n            this.tileCoords.push({z: z, x: x, y: y});\n\n            if (debug) {\n                if (debug > 1) {\n                    console.log('tile z%d-%d-%d (features: %d, points: %d, simplified: %d)',\n                        z, x, y, tile.numFeatures, tile.numPoints, tile.numSimplified);\n                    console.timeEnd('creation');\n                }\n                var key = 'z' + z;\n                this.stats[key] = (this.stats[key] || 0) + 1;\n                this.total++;\n            }\n        }\n\n        // save reference to original geometry in tile so that we can drill down later if we stop now\n        tile.source = features;\n\n        // if it's the first-pass tiling\n        if (!cz) {\n            // stop tiling if we reached max zoom, or if the tile is too simple\n            if (z === options.indexMaxZoom || tile.numPoints <= options.indexMaxPoints) continue;\n\n        // if a drilldown to a specific tile\n        } else {\n            // stop tiling if we reached base zoom or our target tile zoom\n            if (z === options.maxZoom || z === cz) continue;\n\n            // stop tiling if it's not an ancestor of the target tile\n            var m = 1 << (cz - z);\n            if (x !== Math.floor(cx / m) || y !== Math.floor(cy / m)) continue;\n        }\n\n        // stop tiling if the tile is solid clipped square\n        if (!options.solidChildren && isClippedSquare(tile, options.extent, options.buffer)) {\n            if (cz) solid = z; // and remember the zoom if we're drilling down\n            continue;\n        }\n\n        // if we slice further down, no need to keep source geometry\n        tile.source = null;\n\n        if (debug > 1) console.time('clipping');\n\n        // values we'll use for clipping\n        var k1 = 0.5 * options.buffer / options.extent,\n            k2 = 0.5 - k1,\n            k3 = 0.5 + k1,\n            k4 = 1 + k1,\n            tl, bl, tr, br, left, right;\n\n        tl = bl = tr = br = null;\n\n        left  = clip(features, z2, x - k1, x + k3, 0, intersectX, tile.min[0], tile.max[0]);\n        right = clip(features, z2, x + k2, x + k4, 0, intersectX, tile.min[0], tile.max[0]);\n\n        if (left) {\n            tl = clip(left, z2, y - k1, y + k3, 1, intersectY, tile.min[1], tile.max[1]);\n            bl = clip(left, z2, y + k2, y + k4, 1, intersectY, tile.min[1], tile.max[1]);\n        }\n\n        if (right) {\n            tr = clip(right, z2, y - k1, y + k3, 1, intersectY, tile.min[1], tile.max[1]);\n            br = clip(right, z2, y + k2, y + k4, 1, intersectY, tile.min[1], tile.max[1]);\n        }\n\n        if (debug > 1) console.timeEnd('clipping');\n\n        if (tl) stack.push(tl, z + 1, x * 2,     y * 2);\n        if (bl) stack.push(bl, z + 1, x * 2,     y * 2 + 1);\n        if (tr) stack.push(tr, z + 1, x * 2 + 1, y * 2);\n        if (br) stack.push(br, z + 1, x * 2 + 1, y * 2 + 1);\n    }\n\n    return solid;\n};\n\nGeoJSONVT.prototype.getTile = function (z, x, y) {\n    var options = this.options,\n        extent = options.extent,\n        debug = options.debug;\n\n    var z2 = 1 << z;\n    x = ((x % z2) + z2) % z2; // wrap tile x coordinate\n\n    var id = toID(z, x, y);\n    if (this.tiles[id]) return transform.tile(this.tiles[id], extent);\n\n    if (debug > 1) console.log('drilling down to z%d-%d-%d', z, x, y);\n\n    var z0 = z,\n        x0 = x,\n        y0 = y,\n        parent;\n\n    while (!parent && z0 > 0) {\n        z0--;\n        x0 = Math.floor(x0 / 2);\n        y0 = Math.floor(y0 / 2);\n        parent = this.tiles[toID(z0, x0, y0)];\n    }\n\n    if (!parent || !parent.source) return null;\n\n    // if we found a parent tile containing the original geometry, we can drill down from it\n    if (debug > 1) console.log('found parent tile z%d-%d-%d', z0, x0, y0);\n\n    // it parent tile is a solid clipped square, return it instead since it's identical\n    if (isClippedSquare(parent, extent, options.buffer)) return transform.tile(parent, extent);\n\n    if (debug > 1) console.time('drilling down');\n    var solid = this.splitTile(parent.source, z0, x0, y0, z, x, y);\n    if (debug > 1) console.timeEnd('drilling down');\n\n    // one of the parent tiles was a solid clipped square\n    if (solid !== null) {\n        var m = 1 << (z - solid);\n        id = toID(solid, Math.floor(x / m), Math.floor(y / m));\n    }\n\n    return this.tiles[id] ? transform.tile(this.tiles[id], extent) : null;\n};\n\nfunction toID(z, x, y) {\n    return (((1 << z) * y + x) * 32) + z;\n}\n\nfunction intersectX(a, b, x) {\n    return [x, (x - a[0]) * (b[1] - a[1]) / (b[0] - a[0]) + a[1], 1];\n}\nfunction intersectY(a, b, y) {\n    return [(y - a[1]) * (b[0] - a[0]) / (b[1] - a[1]) + a[0], y, 1];\n}\n\nfunction extend(dest, src) {\n    for (var i in src) dest[i] = src[i];\n    return dest;\n}\n\n// checks whether a tile is a whole-area fill after clipping; if it is, there's no sense slicing it further\nfunction isClippedSquare(tile, extent, buffer) {\n\n    var features = tile.source;\n    if (features.length !== 1) return false;\n\n    var feature = features[0];\n    if (feature.type !== 3 || feature.geometry.length > 1) return false;\n\n    var len = feature.geometry[0].length;\n    if (len !== 5) return false;\n\n    for (var i = 0; i < len; i++) {\n        var p = transform.point(feature.geometry[0][i], extent, tile.z2, tile.x, tile.y);\n        if ((p[0] !== -buffer && p[0] !== extent + buffer) ||\n            (p[1] !== -buffer && p[1] !== extent + buffer)) return false;\n    }\n\n    return true;\n}\n","'use strict';\n\nmodule.exports = simplify;\n\n// calculate simplification data using optimized Douglas-Peucker algorithm\n\nfunction simplify(points, tolerance) {\n\n    var sqTolerance = tolerance * tolerance,\n        len = points.length,\n        first = 0,\n        last = len - 1,\n        stack = [],\n        i, maxSqDist, sqDist, index;\n\n    // always retain the endpoints (1 is the max value)\n    points[first][2] = 1;\n    points[last][2] = 1;\n\n    // avoid recursion by using a stack\n    while (last) {\n\n        maxSqDist = 0;\n\n        for (i = first + 1; i < last; i++) {\n            sqDist = getSqSegDist(points[i], points[first], points[last]);\n\n            if (sqDist > maxSqDist) {\n                index = i;\n                maxSqDist = sqDist;\n            }\n        }\n\n        if (maxSqDist > sqTolerance) {\n            points[index][2] = maxSqDist; // save the point importance in squared pixels as a z coordinate\n            stack.push(first);\n            stack.push(index);\n            first = index;\n\n        } else {\n            last = stack.pop();\n            first = stack.pop();\n        }\n    }\n}\n\n// square distance from a point to a segment\nfunction getSqSegDist(p, a, b) {\n\n    var x = a[0], y = a[1],\n        bx = b[0], by = b[1],\n        px = p[0], py = p[1],\n        dx = bx - x,\n        dy = by - y;\n\n    if (dx !== 0 || dy !== 0) {\n\n        var t = ((px - x) * dx + (py - y) * dy) / (dx * dx + dy * dy);\n\n        if (t > 1) {\n            x = bx;\n            y = by;\n\n        } else if (t > 0) {\n            x += dx * t;\n            y += dy * t;\n        }\n    }\n\n    dx = px - x;\n    dy = py - y;\n\n    return dx * dx + dy * dy;\n}\n","'use strict';\n\nmodule.exports = createTile;\n\nfunction createTile(features, z2, tx, ty, tolerance, noSimplify) {\n    var tile = {\n        features: [],\n        numPoints: 0,\n        numSimplified: 0,\n        numFeatures: 0,\n        source: null,\n        x: tx,\n        y: ty,\n        z2: z2,\n        transformed: false,\n        min: [2, 1],\n        max: [-1, 0]\n    };\n    for (var i = 0; i < features.length; i++) {\n        tile.numFeatures++;\n        addFeature(tile, features[i], tolerance, noSimplify);\n\n        var min = features[i].min,\n            max = features[i].max;\n\n        if (min[0] < tile.min[0]) tile.min[0] = min[0];\n        if (min[1] < tile.min[1]) tile.min[1] = min[1];\n        if (max[0] > tile.max[0]) tile.max[0] = max[0];\n        if (max[1] > tile.max[1]) tile.max[1] = max[1];\n    }\n    return tile;\n}\n\nfunction addFeature(tile, feature, tolerance, noSimplify) {\n\n    var geom = feature.geometry,\n        type = feature.type,\n        simplified = [],\n        sqTolerance = tolerance * tolerance,\n        i, j, ring, p;\n\n    if (type === 1) {\n        for (i = 0; i < geom.length; i++) {\n            simplified.push(geom[i]);\n            tile.numPoints++;\n            tile.numSimplified++;\n        }\n\n    } else {\n\n        // simplify and transform projected coordinates for tile geometry\n        for (i = 0; i < geom.length; i++) {\n            ring = geom[i];\n\n            // filter out tiny polylines & polygons\n            if (!noSimplify && ((type === 2 && ring.dist < tolerance) ||\n                                (type === 3 && ring.area < sqTolerance))) {\n                tile.numPoints += ring.length;\n                continue;\n            }\n\n            var simplifiedRing = [];\n\n            for (j = 0; j < ring.length; j++) {\n                p = ring[j];\n                // keep points with importance > tolerance\n                if (noSimplify || p[2] > sqTolerance) {\n                    simplifiedRing.push(p);\n                    tile.numSimplified++;\n                }\n                tile.numPoints++;\n            }\n\n            simplified.push(simplifiedRing);\n        }\n    }\n\n    if (simplified.length) {\n        tile.features.push({\n            geometry: simplified,\n            type: type,\n            tags: feature.tags || null\n        });\n    }\n}\n","'use strict';\n\nexports.tile = transformTile;\nexports.point = transformPoint;\n\n// Transforms the coordinates of each feature in the given tile from\n// mercator-projected space into (extent x extent) tile space.\nfunction transformTile(tile, extent) {\n    if (tile.transformed) return tile;\n\n    var z2 = tile.z2,\n        tx = tile.x,\n        ty = tile.y,\n        i, j, k;\n\n    for (i = 0; i < tile.features.length; i++) {\n        var feature = tile.features[i],\n            geom = feature.geometry,\n            type = feature.type;\n\n        if (type === 1) {\n            for (j = 0; j < geom.length; j++) geom[j] = transformPoint(geom[j], extent, z2, tx, ty);\n\n        } else {\n            for (j = 0; j < geom.length; j++) {\n                var ring = geom[j];\n                for (k = 0; k < ring.length; k++) ring[k] = transformPoint(ring[k], extent, z2, tx, ty);\n            }\n        }\n    }\n\n    tile.transformed = true;\n\n    return tile;\n}\n\nfunction transformPoint(p, extent, z2, tx, ty) {\n    var x = Math.round(extent * (p[0] * z2 - tx)),\n        y = Math.round(extent * (p[1] * z2 - ty));\n    return [x, y];\n}\n","'use strict';\n\nvar clip = require('./clip');\n\nmodule.exports = wrap;\n\nfunction wrap(features, buffer, intersectX) {\n    var merged = features,\n        left  = clip(features, 1, -1 - buffer, buffer,     0, intersectX, -1, 2), // left world copy\n        right = clip(features, 1,  1 - buffer, 2 + buffer, 0, intersectX, -1, 2); // right world copy\n\n    if (left || right) {\n        merged = clip(features, 1, -buffer, 1 + buffer, 0, intersectX, -1, 2); // center world copy\n\n        if (left) merged = shiftFeatureCoords(left, 1).concat(merged); // merge left into center\n        if (right) merged = merged.concat(shiftFeatureCoords(right, -1)); // merge right into center\n    }\n\n    return merged;\n}\n\nfunction shiftFeatureCoords(features, offset) {\n    var newFeatures = [];\n\n    for (var i = 0; i < features.length; i++) {\n        var feature = features[i],\n            type = feature.type;\n\n        var newGeometry;\n\n        if (type === 1) {\n            newGeometry = shiftCoords(feature.geometry, offset);\n        } else {\n            newGeometry = [];\n            for (var j = 0; j < feature.geometry.length; j++) {\n                newGeometry.push(shiftCoords(feature.geometry[j], offset));\n            }\n        }\n\n        newFeatures.push({\n            geometry: newGeometry,\n            type: type,\n            tags: feature.tags,\n            min: [feature.min[0] + offset, feature.min[1]],\n            max: [feature.max[0] + offset, feature.max[1]]\n        });\n    }\n\n    return newFeatures;\n}\n\nfunction shiftCoords(points, offset) {\n    var newPoints = [];\n    newPoints.area = points.area;\n    newPoints.dist = points.dist;\n\n    for (var i = 0; i < points.length; i++) {\n        newPoints.push([points[i][0] + offset, points[i][1], points[i][2]]);\n    }\n    return newPoints;\n}\n"]}