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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 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 | 1x 1x | import { StackViewport } from '@cornerstonejs/core';
import type { Types } from '@cornerstonejs/core';
import { vec3 } from 'gl-matrix';
const EPSILON = 1e-3;
/**
* Gets the desired spacing for points in the polyline for the
* `PlanarFreehandROITool` in the x and y canvas directions, as well as
* returning these canvas directions in world space.
*
* @param viewport - The Cornerstone3D `StackViewport` or `VolumeViewport`.
* @param subPixelResolution - The number to divide the image pixel spacing by
* to get the sub pixel spacing. E.g. `10` will return spacings 10x smaller than
* the native image spacing.
* @returns The spacings of the X and Y directions, and the 3D directions of the
* x and y directions.
*/
const getSubPixelSpacingAndXYDirections = (
viewport: Types.IStackViewport | Types.IVolumeViewport,
subPixelResolution: number
): { spacing: Types.Point2; xDir: Types.Point3; yDir: Types.Point3 } => {
let spacing;
let xDir;
let yDir;
if (viewport instanceof StackViewport) {
// Check XY directions
const imageData = viewport.getImageData();
xDir = imageData.direction.slice(0, 3);
yDir = imageData.direction.slice(3, 6);
spacing = imageData.spacing;
} else {
// Check volume directions
const imageData = viewport.getImageData();
const { direction, spacing: volumeSpacing } = imageData;
const { viewPlaneNormal, viewUp } = viewport.getCamera();
// Calculate size of spacing vector in normal direction
const iVector = direction.slice(0, 3) as Types.Point3;
const jVector = direction.slice(3, 6) as Types.Point3;
const kVector = direction.slice(6, 9) as Types.Point3;
const viewRight = vec3.create(); // Get the X direction of the viewport
vec3.cross(viewRight, <vec3>viewUp, <vec3>viewPlaneNormal);
const absViewRightDotI = Math.abs(vec3.dot(viewRight, iVector));
const absViewRightDotJ = Math.abs(vec3.dot(viewRight, jVector));
const absViewRightDotK = Math.abs(vec3.dot(viewRight, kVector));
// Get X spacing
let xSpacing;
if (Math.abs(1 - absViewRightDotI) < EPSILON) {
xSpacing = volumeSpacing[0];
xDir = iVector;
} else if (Math.abs(1 - absViewRightDotJ) < EPSILON) {
xSpacing = volumeSpacing[1];
xDir = jVector;
} else if (Math.abs(1 - absViewRightDotK) < EPSILON) {
xSpacing = volumeSpacing[2];
xDir = kVector;
} else {
throw new Error('No support yet for oblique plane planar contours');
}
const absViewPlaneNormalDotI = Math.abs(vec3.dot(viewPlaneNormal, iVector));
const absViewPlaneNormalDotJ = Math.abs(vec3.dot(viewPlaneNormal, jVector));
const absViewPlaneNormalDotK = Math.abs(vec3.dot(viewPlaneNormal, kVector));
// Get Y spacing
let ySpacing;
if (Math.abs(1 - absViewPlaneNormalDotI) < EPSILON) {
ySpacing = volumeSpacing[0];
yDir = iVector;
} else if (Math.abs(1 - absViewPlaneNormalDotJ) < EPSILON) {
ySpacing = volumeSpacing[1];
yDir = jVector;
} else if (Math.abs(1 - absViewPlaneNormalDotK) < EPSILON) {
ySpacing = volumeSpacing[2];
yDir = kVector;
} else {
throw new Error('No support yet for oblique plane planar contours');
}
spacing = [xSpacing, ySpacing];
}
const subPixelSpacing: Types.Point2 = [
spacing[0] / subPixelResolution,
spacing[1] / subPixelResolution,
];
return { spacing: subPixelSpacing, xDir, yDir };
};
export default getSubPixelSpacingAndXYDirections;
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