@giro3d/giro3d/utils/OpenLayersUtils.js

A JS/WebGL framework for 3D geospatial data visualization

import { Color } from 'three';
import Extent from '../core/geographic/Extent';
function fromOLExtent(extent, projectionCode) {
  return new Extent(projectionCode, extent[0], extent[2], extent[1], extent[3]);
}
function toOLExtent(extent, margin = 0) {
  return [extent.west - margin, extent.south - margin, extent.east + margin, extent.north + margin];
}
function parseAlpha(css) {
  let color;
  const parse = s => {
    if (!s) {
      return 1;
    }
    return parseFloat(s);
  };

  // rgb(255,0,0) rgba(255,0,0,0.5)
  if (color = /^\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*(?:,\s*(\d*\.?\d+)\s*)?$/.exec(css)) {
    return parse(color[4]);
  }
  // rgb(100%,0%,0%) rgba(100%,0%,0%,0.5)
  if (color = /^\s*(\d+)%\s*,\s*(\d+)%\s*,\s*(\d+)%\s*(?:,\s*(\d*\.?\d+)\s*)?$/.exec(css)) {
    return parse(color[4]);
  }
  return 1;
}
function fromOLColor(input) {
  if (typeof input === 'string') {
    const color = new Color().setStyle(input);
    const opacity = parseAlpha(input);
    return {
      color,
      opacity
    };
  } else if (Array.isArray(input)) {
    const [r, g, b, a] = input;
    return {
      color: new Color(r / 255, g / 255, b / 255),
      opacity: a
    };
  } else {
    throw new Error('unsupported color: ' + input);
  }
}
function getFeatureExtent(feature, crs) {
  const geometry = feature.getGeometry();
  if (!geometry) {
    return undefined;
  }
  const olExtent = geometry.getExtent();
  return fromOLExtent(olExtent, crs);
}
export default {
  fromOLExtent,
  toOLExtent,
  fromOLColor,
  getFeatureExtent
};