landxml/lib/pipe-network.js

import { getProp, parseSequence, getColor, circleToPolygon } from './util'
import { point, lineString, polygon } from '@turf/helpers';
import transformTranslate from '@turf/transform-translate';
import clone from '@turf/clone';
import proj4 from 'proj4';

export const LANDXML_PIPE_NETWORK_PIPE = 'pipe_network_pipe';
export const LANDXML_PIPE_NETWORK_STRUCT = 'pipe_network_struct';

export function convertPipeNetworks(xmlObj, projection, opts) {

  const features = [];

  const pipeNetworksNodes = getProp(xmlObj, "LandXML", "PipeNetworks");

  if (!pipeNetworksNodes) return features;

  pipeNetworksNodes.forEach(pn => {

    const pipeNetworkNodes = getProp(pn, "PipeNetwork");

    if (!Array.isArray(pipeNetworkNodes)) return;

    let structs = {};

    pipeNetworkNodes.forEach(pn => {

      const baseProps = {
        name: pn.$.name,
        description: pn.$.desc,
      };

      const localStructs = convertStructs(pn, projection, baseProps, opts);

      features.push(...Object.values(localStructs).map(s => s.geometry));

      Object.assign(structs, localStructs);
      
    });

    pipeNetworkNodes.forEach(pn => {
      const baseProps = {
        name: pn.$.name,
        description: pn.$.desc,
        landxmlType: LANDXML_PIPE_NETWORK_PIPE,
      };

      const pipes = convertPipes(pn, structs, projection, baseProps, opts);
 
      features.push(...pipes);
      
    });

  });


  return features;

}

function convertPipes(pipeNetwork, structs, projection, baseProps, opts) {
  const pipes = [];

  const pipeNodes = getProp(pipeNetwork, "Pipes", 0, "Pipe");

  if (!Array.isArray(pipeNodes)) return;

  pipeNodes.forEach(p => {

    const circPipeNode = getProp(p, "CircPipe", 0);

    const name = baseProps.name ? baseProps.name + ' - ' + p.$.name : p.$.name;
    const featureProps = Object.assign({}, baseProps, {
      name: name,
      description: baseProps.description ? baseProps.description + ' - ' + p.$.desc : p.$.desc,
      landxmlColor: getColor(`pipe-network-pipe-${name}`, opts.colorOpts)
    });

    if (circPipeNode !== undefined) {
      const attrs = circPipeNode.$;
      if ('diameter' in attrs) featureProps.landxmlDiameter = parseFloat(attrs.diameter);
      if ('thickness' in attrs) featureProps.landxmlThickness = parseFloat(attrs.thickness);
    }

    const refStart = structs[p.$.refStart];
    const refEnd = structs[p.$.refEnd];

    if (!refStart) throw new Error(`Cannot find pipe "${featureProps.name}" refStart "${p.$.refStart}" !`);
    if (!refEnd) throw new Error(`Cannot find pipe "${featureProps.name}" refEnd "${p.$.refEnd}" !`);

    const pipe = lineString([
      refStart.center,
      refEnd.center,
    ], featureProps);

    pipes.push(pipe);

  });

  return pipes;
}

function convertStructs(pipeNetwork, projection, baseProps, opts) {

  const structs = {};

  const structNodes = getProp(pipeNetwork, "Structs", 0, "Struct");

  if (!Array.isArray(structNodes)) return;

  structNodes.forEach(s => {
    
    const centerNode = getProp(s, "Center", 0);
    const rectStructNode = getProp(s, "RectStruct", 0);
    const circStructNode = getProp(s, "CircStruct", 0);
    const inletStructNode = getProp(s, "InletStruct", 0);
    const outletStructNode = getProp(s, "OutletStruct", 0);
    const connectionNode = getProp(s, "Connection", 0);

    const structType = rectStructNode !== undefined ? "rect" : ( 
      ( circStructNode !== undefined ? "circ" :
      ( inletStructNode !== undefined ? "inlet" :
      ( outletStructNode !== undefined ? "outlet" :
      ( connectionNode !== undefined ? "connection" :
      ( null )
    )))));

    const name = baseProps.name ? baseProps.name + ' - ' + s.$.name : s.$.name;
    const featureProps = Object.assign({}, baseProps, {
      name: name,
      description: baseProps.description ? baseProps.description + ' - ' + s.$.desc : s.$.desc,
      landxmlType: LANDXML_PIPE_NETWORK_STRUCT,
      landxmlStruct: structType,
      landxmlElevRim: 'elevRim' in s.$ ? parseFloat(s.$.elevRim) : undefined,
      landxmlElevSump: 'elevSump' in s.$ ? parseFloat(s.$.elevSump) : undefined,
      landxmlColor: getColor(`pipe-network-struct-${name}`, opts.colorOpts)
    });

    if (circStructNode !== undefined) {
      const attrs = circStructNode.$;
      if ('diameter' in attrs) featureProps.landxmlDiameter = parseFloat(attrs.diameter);
      if ('thickness' in attrs) featureProps.landxmlThickness = parseFloat(attrs.thickness);
    }

    if (rectStructNode !== undefined) {
      const attrs = rectStructNode.$;
      if ('thickness' in attrs) featureProps.landxmlThickness = parseFloat(attrs.thickness);
      if ('length' in attrs) featureProps.landxmlLength = parseFloat(attrs.length);
      if ('width' in attrs) featureProps.landxmlWidth = parseFloat(attrs.width);
    }

    // Parse and convert center coordinates
    const seq = parseSequence(centerNode).map(v => parseFloat(v));
    let center = [seq[1], seq[0]];
    center = proj4(projection, 'WGS84', center);

    let geometry;

    if (rectStructNode) {
      const length = featureProps.length ? featureProps.length : 1;
      const width = featureProps.width ? featureProps.width : 1;
      geometry = squareAround(center, length, width, 'meters', featureProps);
    } else {
      const diameter = featureProps.landxmlDiameter ? featureProps.landxmlDiameter : 1;
      geometry = circleToPolygon(center, diameter/2, 128, featureProps);
    }

    if (!geometry) {
      throw new Error("Unsupported struct type")
    };
      
    structs[s.$.name] = { geometry, center };

  });

  return structs;

}

function squareAround(centerCoords, length, width, units, properties) {
  const center = point(centerCoords);

  const northEast = clone(center);
  transformTranslate(northEast, width/2, 270, { units, mutate: true });
  transformTranslate(northEast, length/2, 0, { units, mutate: true });

  const northWest = clone(center);
  transformTranslate(northWest, width/2, 90, { units, mutate: true });
  transformTranslate(northWest, length/2, 0, { units, mutate: true });

  const southWest = clone(center);
  transformTranslate(southWest, width/2, 90, { units, mutate: true });
  transformTranslate(southWest, length/2, 180, { units, mutate: true });

  const southEast = clone(center);
  transformTranslate(southEast, width/2, 270, { units, mutate: true });
  transformTranslate(southEast, length/2, 180, { units, mutate: true });

  const points = [
    northEast.geometry.coordinates, northWest.geometry.coordinates, 
    southWest.geometry.coordinates, southEast.geometry.coordinates,
    northEast.geometry.coordinates
  ];

  return polygon([points], properties);

}