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Added more options like capstyles for buffering #14

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Added more options like capstyles for buffering #14

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67 changes: 55 additions & 12 deletions src/gis/buffer.js
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Original file line number Diff line number Diff line change
@@ -1,8 +1,8 @@
import initGeosJs from "geos-wasm";
import { geojsonToGeosGeom } from "../helpers/geojsonToGeosGeom";
import { geosGeomToGeojson } from "../helpers/geosGeomToGeojson";
import { km2deg } from "../utils/km2deg.js";
import { featurecollection } from "../utils/featurecollection.js";
import initGeosJs from 'geos-wasm';
import { geojsonToGeosGeom } from '../helpers/geojsonToGeosGeom';
import { geosGeomToGeojson } from '../helpers/geosGeomToGeojson';
import { km2deg } from '../utils/km2deg.js';
import { featurecollection } from '../utils/featurecollection.js';

/**
* Build a buffer with GEOS-WASM around a FeatureCollection or a set of Features or Geometries.
Expand Down Expand Up @@ -31,26 +31,59 @@ export async function buffer(x, options = {}) {
let wgs84 = options.wgs84 === false ? false : true;
let distance = 0;
switch (typeof options.dist) {
case "number":
case 'number':
distance = wgs84 ? km2deg(options.dist) : options.dist;
break;
case "string":
case 'string':
distance = options.dist;
break;
}

let endCapStyle = options.endCapStyle;
let joinStyle = options.joinStyle;
let mitreLimit = options.mitreLimit;
let singleSided = options.singleSided;

const isBufferWithParams =
endCapStyle || joinStyle || mitreLimit || singleSided;

let bufferParamsPtr;
if (isBufferWithParams) {
bufferParamsPtr = geos.GEOSBufferParams_create();
if (endCapStyle) {
geos.GEOSBufferParams_setEndCapStyle(bufferParamsPtr, endCapStyle);
}
if (joinStyle) {
geos.GEOSBufferParams_setJoinStyle(bufferParamsPtr, joinStyle);
}
if (mitreLimit) {
geos.GEOSBufferParams_setMitreLimit(bufferParamsPtr, mitreLimit);
}
if (quadsegs) {
geos.GEOSBufferParams_setQuadrantSegments(bufferParamsPtr, quadsegs);
}
if (singleSided) {
geos.GEOSBufferParams_setSingleSided(bufferParamsPtr, singleSided);
}
}

// keep properties
let prop = { ...x };
delete prop.features;

// One buffer
let newGeom;
if (options.merge) {
const geosGeom = geojsonToGeosGeom(x, geos);
const newGeom = geos.GEOSBuffer(geosGeom, distance, quadsegs);
if (isBufferWithParams) {
newGeom = geos.GEOSBufferWithParams(geosGeom, bufferParamsPtr, distance);
} else {
newGeom = geos.GEOSBuffer(geosGeom, distance, quadsegs);
}
return Object.assign(prop, {
features: [
{
type: "Feature",
type: 'Feature',
properties: {},
geometry: geosGeomToGeojson(newGeom, geos),
},
Expand All @@ -63,16 +96,26 @@ export async function buffer(x, options = {}) {
let buff = [];
x.features.forEach((d) => {
let featdist =
typeof distance == "number"
typeof distance == 'number'
? distance
: wgs84
? km2deg(d.properties[distance])
: d.properties[distance];
const geosGeom = geojsonToGeosGeom(d, geos);
const newGeom = geos.GEOSBuffer(geosGeom, featdist, quadsegs);

let newGeom;
if (isBufferWithParams) {
newGeom = geos.GEOSBufferWithParams(
geosGeom,
bufferParamsPtr,
distance
);
} else {
newGeom = geos.GEOSBuffer(geosGeom, distance, quadsegs);
}

buff.push({
type: "Feature",
type: 'Feature',
properties: d.properties,
geometry: geosGeomToGeojson(newGeom, geos),
});
Expand Down