53 lines
1.4 KiB
Plaintext
53 lines
1.4 KiB
Plaintext
import getPixelSpacing from './getPixelSpacing'
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/**
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* Calculates longest and shortest diameters using measurement handles and pixelSpacing
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* @param {Object} measurementData
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* @param {Object} pixelSpacing pixelSpacing
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*
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*@returns {Object} longestDiameter and shortestDiameter
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*/
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export default function calculateLongestAndShortestDiameters(
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measurementData,
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image,
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digits = 1
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) {
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const pixelSpacing = getPixelSpacing(image)
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const { rowPixelSpacing, colPixelSpacing } = pixelSpacing
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const {
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start,
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end,
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perpendicularStart,
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perpendicularEnd
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} = measurementData.handles
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// Calculate the long axis length
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const dx = (start.x - end.x) * (colPixelSpacing || 1)
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const dy = (start.y - end.y) * (rowPixelSpacing || 1)
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let length = Math.sqrt(dx * dx + dy * dy)
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// Calculate the short axis length
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const wx =
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(perpendicularStart.x - perpendicularEnd.x) * (colPixelSpacing || 1)
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const wy =
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(perpendicularStart.y - perpendicularEnd.y) * (rowPixelSpacing || 1)
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let width = Math.sqrt(wx * wx + wy * wy)
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if (!width) {
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width = 0
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}
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// Length is always longer than width
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if (width > length) {
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const tempW = width
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const tempL = length
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length = tempW
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width = tempL
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}
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return {
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longestDiameter: length.toFixed(digits),
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shortestDiameter: width.toFixed(digits)
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}
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}
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