# All files util.js

75.86% Statements 88/116
61.01% Branches 36/59
80% Functions 8/10
76.69% Lines 79/103

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     import EventType from 'ol/events/EventType.js';
    import {labelCache} from 'ol/render/canvas.js';
    import {listen} from 'ol/events.js';

    /**
     * Polyfill for Object.assign().  Assigns enumerable and own properties from
     * one or more source objects to a target object.
     * See https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Object/assign.
     *
     * @param {!Object} target The target object.
     * @param {...Object} var_sources The source object(s).
     * @return {!Object} The modified target object.
     */
    export const assign =
      typeof Object.assign === 'function'
        ? Object.assign
        : function (target, var_sources) {
            if (target === undefined || target === null) {
              throw new TypeError('Cannot convert undefined or null to object');
            }

            const output = Object(target);
            for (let i = 1, ii = arguments.length; i < ii; ++i) {
              const source = arguments[i];
              if (source !== undefined && source !== null) {
                for (const key in source) {
                  if (source.hasOwnProperty(key)) {
                    output[key] = source[key];
                  }
                }
              }
            }
            return output;
          };

    export function deg2rad(degrees) {
      return (degrees * Math.PI) / 180;
    }

    export const defaultResolutions = (function () {
      const resolutions = [];
      for (let res = 78271.51696402048; resolutions.length <= 24; res /= 2) {
        resolutions.push(res);
      }
      return resolutions;
    })();

    /**
     * @param {number} width Width of the canvas.
     * @param {number} height Height of the canvas.
     * @return {HTMLCanvasElement} Canvas.
     */
    export function createCanvas(width, height) {
      Iif (typeof WorkerGlobalScope !== 'undefined' && self instanceof WorkerGlobalScope && typeof OffscreenCanvas !== 'undefined') { // eslint-disable-line
        return /** @type {?} */ (new OffscreenCanvas(width, height));
      } else {
        const canvas = document.createElement('canvas');
        canvas.width = width;
        canvas.height = height;
        return canvas;
      }
    }

    export function getZoomForResolution(resolution, resolutions) {
      let i = 0;
      const ii = resolutions.length;
      for (; i < ii; ++i) {
        const candidate = resolutions[i];
        if (candidate < resolution && i + 1 < ii) {
          const zoomFactor = resolutions[i] / resolutions[i + 1];
          return i + Math.log(resolutions[i] / resolution) / Math.log(zoomFactor);
        }
      }
      return ii - 1;
    }

    const hairSpacePool = Array(256).join('\u200A');
    export function applyLetterSpacing(text, letterSpacing) {
      Iif (letterSpacing >= 0.05) {
        let textWithLetterSpacing = '';
        const lines = text.split('\n');
        const joinSpaceString = hairSpacePool.slice(
          0,
          Math.round(letterSpacing / 0.1)
        );
        for (let l = 0, ll = lines.length; l < ll; ++l) {
          if (l > 0) {
            textWithLetterSpacing += '\n';
          }
          textWithLetterSpacing += lines[l].split('').join(joinSpaceString);
        }
        return textWithLetterSpacing;
      }
      return text;
    }

    let measureContext;
    function getMeasureContext() {
      if (!measureContext) {
        measureContext = createCanvas(1, 1).getContext('2d');
      }
      return measureContext;
    }

    function measureText(text, letterSpacing) {
      return (
        getMeasureContext().measureText(text).width +
        (text.length - 1) * letterSpacing
      );
    }

    let measureCache = {};
    Eif (labelCache) {
      // Only available when using ES modules
      //@ts-ignore
      listen(labelCache, EventType.CLEAR, function () {
        measureCache = {};
      });
    }
    export function wrapText(text, font, em, letterSpacing) {
      if (text.indexOf('\n') !== -1) {
        const hardLines = text.split('\n');
        const lines = [];
        for (let i = 0, ii = hardLines.length; i < ii; ++i) {
          lines.push(wrapText(hardLines[i], font, em, letterSpacing));
        }
        return lines.join('\n');
      }
      const key = em + ',' + font + ',' + text + ',' + letterSpacing;
      let wrappedText = measureCache[key];
      if (!wrappedText) {
        const words = text.split(' ');
        if (words.length > 1) {
          const ctx = getMeasureContext();
          ctx.font = font;
          const oneEm = ctx.measureText('M').width;
          const maxWidth = oneEm * em;
          let line = '';
          const lines = [];
          // Pass 1 - wrap lines to not exceed maxWidth
          for (let i = 0, ii = words.length; i < ii; ++i) {
            const word = words[i];
            const testLine = line + (line ? ' ' : '') + word;
            if (measureText(testLine, letterSpacing) <= maxWidth) {
              line = testLine;
            } else {
              if (line) {
                lines.push(line);
              }
              line = word;
            }
          }
          Eif (line) {
            lines.push(line);
          }
          // Pass 2 - add lines with a width of less than 35% of maxWidth to the previous or next line
          for (let i = 0, ii = lines.length; i < ii && ii > 1; ++i) {
            const line = lines[i];
            if (measureText(line, letterSpacing) < maxWidth * 0.35) {
              const prevWidth =
                i > 0 ? measureText(lines[i - 1], letterSpacing) : Infinity;
              const nextWidth =
                i < ii - 1 ? measureText(lines[i + 1], letterSpacing) : Infinity;
              lines.splice(i, 1);
              ii -= 1;
              Eif (prevWidth < nextWidth) {
                lines[i - 1] += ' ' + line;
                i -= 1;
              } else {
                lines[i] = line + ' ' + lines[i];
              }
            }
          }
          // Pass 3 - try to fill 80% of maxWidth for each line
          for (let i = 0, ii = lines.length - 1; i < ii; ++i) {
            const line = lines[i];
            const next = lines[i + 1];
            if (
              measureText(line, letterSpacing) > maxWidth * 0.65 &&
              measureText(next, letterSpacing) < maxWidth * 0.65
            ) {
              const lineWords = line.split(' ');
              const lastWord = lineWords.pop();
              Iif (measureText(lastWord, letterSpacing) < maxWidth * 0.2) {
                lines[i] = lineWords.join(' ');
                lines[i + 1] = lastWord + ' ' + next;
              }
              ii -= 1;
            }
          }
          wrappedText = lines.join('\n');
        } else {
          wrappedText = text;
        }
        wrappedText = applyLetterSpacing(wrappedText, letterSpacing);
        measureCache[key] = wrappedText;
      }
      return wrappedText;
    }