github.com/DerekStrickland/consul@v1.4.5/ui-v2/app/components/tomography-graph.js (about)

     1  import Component from '@ember/component';
     2  import { computed, set, get } from '@ember/object';
     3  
     4  const size = 336;
     5  const insetSize = size / 2 - 8;
     6  const inset = function(num) {
     7    return insetSize * num;
     8  };
     9  const milliseconds = function(num, max) {
    10    return max > 0 ? parseInt(max * num) / 100 : 0;
    11  };
    12  export default Component.extend({
    13    size: size,
    14    tomography: 0,
    15    max: -999999999,
    16    init: function() {
    17      this._super(...arguments);
    18      this.circle = [inset(1), inset(0.25), inset(0.5), inset(0.75), inset(1)];
    19      this.labels = [inset(-0.25), inset(-0.5), inset(-0.75), inset(-1)];
    20    },
    21    milliseconds: computed('distances', 'max', function() {
    22      const max = get(this, 'max');
    23      return [
    24        milliseconds(25, max),
    25        milliseconds(50, max),
    26        milliseconds(75, max),
    27        milliseconds(100, max),
    28      ];
    29    }),
    30    distances: computed('tomography', function() {
    31      const tomography = this.get('tomography');
    32      let distances = tomography.distances || [];
    33      distances.forEach((d, i) => {
    34        if (d.distance > get(this, 'max')) {
    35          set(this, 'max', d.distance);
    36        }
    37      });
    38      if (tomography.n > 360) {
    39        let n = distances.length;
    40        // We have more nodes than we want to show, take a random sampling to keep
    41        // the number around 360.
    42        const sampling = 360 / tomography.n;
    43        distances = distances.filter(function(_, i) {
    44          return i == 0 || i == n - 1 || Math.random() < sampling;
    45        });
    46      }
    47      return distances.map((d, i) => {
    48        return {
    49          rotate: i * 360 / distances.length,
    50          y2: -insetSize * (d.distance / get(this, 'max')),
    51          node: d.node,
    52          distance: d.distance,
    53          segment: d.segment,
    54        };
    55      });
    56    }),
    57  });