# All files util.js

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

Press n or j to go to the next uncovered block, b, p or k for the previous block.

    1
    2
    3
    4
    5
    6
    7
    8
    9
    10
    11
    12
    13
    14
    15
    16
    17
    18
    19
    20
    21
    22
    23
    24
    25
    26
    27
    28
    29
    30
    31
    32
    33
    34
    35
    36
    37
    38
    39
    40
    41
    42
    43
    44
    45
    46
    47
    48
    49
    50
    51
    52
    53
    54
    55
    56
    57
    58
    59
    60
    61
    62
    63
    64
    65
    66
    67
    68
    69
    70
    71
    72
    73
    74
    75
    76
    77
    78
    79
    80
    81
    82
    83
    84
    85
    86
    87
    88
    89
    90
    91
    92
    93
    94
    95
    96
    97
    98
    99
    100
    101
    102
    103
    104
    105
    106
    107
    108
    109
    110
    111
    112
    113
    114
    115
    116
    117
    118
    119
    120
    121
    122
    123
    124
    125
    126
    127
    128
    129
    130
    131
    132
    133
    134
    135
    136
    137
    138
    139
    140
    141
    142
    143
    144
    145
    146
    147
    148
    149
    150
    151
    152
    153
    154
    155
    156
    157
    158
    159
    160
    161
    162
    163
    164
    165
    166
    167
    168
    169
    170
    171
    172
    173
    174
    175
    176
    177
    178
    179
    180
    181
    182
    183
    184
    185
    186
    187
    188
    189
    190
    191
    192
    193
    194
    195
    196
    197
    198
    199
    200

    1x

    8x

    1x
    1x
    1x
    25x

    1x

    1x

    1x
    1x
    1x
    1x

    25x
    25x
    25x
    450x
    450x
    25x
    25x

    1x

    11x

    11x

    50x
    1x

    50x

    43x

    1x
    1x

    1x

    12x
    1x
    1x
    1x
    2x

    1x

    11x
    11x
    11x
    9x
    9x
    7x
    7x
    7x
    7x
    7x
    7x

    7x
    25x
    25x
    25x
    19x

    6x
    5x

    6x

    7x
    7x

    7x
    9x
    9x

    1x

    1x
    1x
    1x
    1x
    1x
    1x

    7x
    4x
    4x
    4x

    1x
    1x
    1x

    1x

    7x

    2x

    9x
    9x

    11x

     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 30% 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 * 0.7 &&
              measureText(next, letterSpacing) < maxWidth * 0.6
            ) {
              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;
    }