| 1 | "use strict";
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| 2 |
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| 3 | Object.defineProperty(exports, "__esModule", {
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| 4 | value: true
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| 5 | });
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| 6 | exports.default = ticks;
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| 7 | exports.tickIncrement = tickIncrement;
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| 8 | exports.tickStep = tickStep;
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| 9 | var e10 = Math.sqrt(50),
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| 10 | e5 = Math.sqrt(10),
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| 11 | e2 = Math.sqrt(2);
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| 12 | function ticks(start, stop, count) {
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| 13 | var reverse,
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| 14 | i = -1,
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| 15 | n,
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| 16 | ticks,
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| 17 | step;
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| 18 | stop = +stop, start = +start, count = +count;
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| 19 | if (start === stop && count > 0) return [start];
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| 20 | if (reverse = stop < start) n = start, start = stop, stop = n;
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| 21 | if ((step = tickIncrement(start, stop, count)) === 0 || !isFinite(step)) return [];
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| 22 | if (step > 0) {
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| 23 | let r0 = Math.round(start / step),
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| 24 | r1 = Math.round(stop / step);
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| 25 | if (r0 * step < start) ++r0;
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| 26 | if (r1 * step > stop) --r1;
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| 27 | ticks = new Array(n = r1 - r0 + 1);
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| 28 | while (++i < n) ticks[i] = (r0 + i) * step;
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| 29 | } else {
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| 30 | step = -step;
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| 31 | let r0 = Math.round(start * step),
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| 32 | r1 = Math.round(stop * step);
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| 33 | if (r0 / step < start) ++r0;
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| 34 | if (r1 / step > stop) --r1;
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| 35 | ticks = new Array(n = r1 - r0 + 1);
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| 36 | while (++i < n) ticks[i] = (r0 + i) / step;
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| 37 | }
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| 38 | if (reverse) ticks.reverse();
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| 39 | return ticks;
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| 40 | }
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| 41 | function tickIncrement(start, stop, count) {
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| 42 | var step = (stop - start) / Math.max(0, count),
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| 43 | power = Math.floor(Math.log(step) / Math.LN10),
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| 44 | error = step / Math.pow(10, power);
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| 45 | return power >= 0 ? (error >= e10 ? 10 : error >= e5 ? 5 : error >= e2 ? 2 : 1) * Math.pow(10, power) : -Math.pow(10, -power) / (error >= e10 ? 10 : error >= e5 ? 5 : error >= e2 ? 2 : 1);
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| 46 | }
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| 47 | function tickStep(start, stop, count) {
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| 48 | var step0 = Math.abs(stop - start) / Math.max(0, count),
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| 49 | step1 = Math.pow(10, Math.floor(Math.log(step0) / Math.LN10)),
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| 50 | error = step0 / step1;
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| 51 | if (error >= e10) step1 *= 10;else if (error >= e5) step1 *= 5;else if (error >= e2) step1 *= 2;
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| 52 | return stop < start ? -step1 : step1;
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| 53 | } |
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