38 lines
1011 B
JavaScript
38 lines
1011 B
JavaScript
module.exports = {
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angleFromPositions (cx, cy, ex, ey) {
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let theta = Math.atan2(ey - cy, ex - cx) + Math.PI / 2;
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return theta * 180 / Math.PI;
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},
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angle360FromPositions (cx, cy, ex, ey) {
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let angle = this.angleFromPositions(cx, cy, ex, ey);
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return angle < 0 ? 360 + angle : angle;
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},
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range (start = 0, stop = null, step = 1) {
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let [_start, _stop] = (stop !== null) ? [start, stop] : [0, start];
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let length = Math.max(Math.ceil((_stop - _start) / step), 0);
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let range = Array(length);
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for (let idx = 0; idx < length; idx++, _start += step) {
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range[idx] = _start;
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}
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return range;
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},
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round (number, decimals) {
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if (!isNaN(parseFloat(number)) && isFinite(number)) {
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let decimalPower = Math.pow(10, decimals);
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return Math.round(parseFloat(number) * decimalPower) / decimalPower;
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}
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return NaN;
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},
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events: require('./events'),
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prefixer: require('./prefixer'),
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time: require('./time'),
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testing: require('./testing')
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};
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