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8 lines
225 B
JavaScript
8 lines
225 B
JavaScript
var ln360 = Math.log2(360)
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module.exports = function (bbox) {
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var dx = bbox[2] - bbox[0]
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var dy = bbox[3] - bbox[1]
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var d = Math.max(dx,dy)
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var zoom = ln360 - Math.log2(d) + 1
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return Math.max(Math.min(zoom,21),1)
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}
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