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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 | import { vec3 } from 'gl-matrix';
import { metaData } from '..';
import { Point2, Point3 } from '../types';
/**
* Given the imageId and a 2d coordinates on the image space with [0,0] being the top left corner
* of the top left pixel, and options which includes the imageId, it returns the
* 3d coordinates on the world space.
* @param imageId - The image id
* @param imageCoords - The 2d coordinates on the image
* @returns The 3d coordinates on the world.
*
*/
export default function imageToWorldCoords(
imageId: string,
imageCoords: Point2
): Point3 | undefined {
const imagePlaneModule = metaData.get('imagePlaneModule', imageId);
if (!imagePlaneModule) {
throw new Error(`No imagePlaneModule found for imageId: ${imageId}`);
}
const {
columnCosines,
rowCosines,
imagePositionPatient: origin,
} = imagePlaneModule;
let { columnPixelSpacing, rowPixelSpacing } = imagePlaneModule;
// Use ||= to convert null and 0 as well as undefined to 1
columnPixelSpacing ||= 1;
rowPixelSpacing ||= 1;
// calculate the image coordinates in the world space
const imageCoordsInWorld = vec3.create();
// move from origin in the direction of the row cosines with the amount of
// row pixel spacing times the first element of the image coordinates vector
vec3.scaleAndAdd(
imageCoordsInWorld,
origin,
rowCosines,
// to accommodate the [0,0] being on the top left corner of the top left pixel
// but the origin is at the center of the top left pixel
rowPixelSpacing * (imageCoords[0] - 0.5)
);
vec3.scaleAndAdd(
imageCoordsInWorld,
imageCoordsInWorld,
columnCosines,
columnPixelSpacing * (imageCoords[1] - 0.5)
);
return Array.from(imageCoordsInWorld) as Point3;
}
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