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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 | import type { Point2, Point3 } from '../../../types';
import type { ProjectionScale } from '../ViewportProjectionTypes';
import {
WSI_PROJECTION_ID,
type WSIProjectionRequest,
type WSIProjectionSnapshot,
} from './WSIProjectionTypes';
import type { WSIViewState } from './WSIViewportTypes';
/**
* Clones a canvas-space point so snapshots do not expose mutable tuples.
*/
function clonePoint2(point: Point2): Point2 {
return [point[0], point[1]];
}
/**
* Returns a normalized WSI view state suitable for projection snapshots.
*/
function normalizeWSIProjectionViewState(
viewState: WSIViewState
): WSIViewState {
return {
...viewState,
centerIndex: viewState.centerIndex
? [viewState.centerIndex[0], viewState.centerIndex[1]]
: undefined,
resolution:
typeof viewState.resolution === 'number'
? Math.max(viewState.resolution, 0.000001)
: undefined,
rotation: viewState.rotation ?? 0,
zoom: Math.max(viewState.zoom ?? 1, 0.001),
};
}
/**
* Returns the center canvas point used as the default projection anchor.
*/
function getCenterCanvasPoint(
canvasWidth: number,
canvasHeight: number
): Point2 {
return [canvasWidth / 2, canvasHeight / 2];
}
/**
* Derives the physical world scale from a renderer-compatible WSI camera.
* WSI camera compatibility has historically stored the full viewport height in
* `parallelScale`, not VTK's half-height parallel-scale convention.
*/
function getScale(args: {
canvasHeight: number;
rendererCamera?: WSIProjectionSnapshot['rendererCamera'];
zoom: number;
}): ProjectionScale {
const { canvasHeight, rendererCamera, zoom } = args;
if (typeof rendererCamera?.parallelScale === 'number') {
return {
kind: 'physical',
mmPerCanvasPixel:
rendererCamera.parallelScale / Math.max(canvasHeight, 1),
};
}
return { kind: 'fit', value: zoom };
}
/**
* Builds the WSI projection snapshot for a viewport-like object.
*/
export function getWSIProjectionSnapshot(
request: WSIProjectionRequest
): WSIProjectionSnapshot | undefined {
const { viewport } = request;
const currentViewState = request.viewState ?? viewport.getViewState?.();
if (!currentViewState) {
return;
}
const viewState = normalizeWSIProjectionViewState(currentViewState);
const resolvedView = request.resolvedView ?? viewport.getResolvedView?.();
const canvasWidth =
request.canvasWidth ??
resolvedView?.state?.canvasWidth ??
viewport.element?.clientWidth ??
1;
const canvasHeight =
request.canvasHeight ??
resolvedView?.state?.canvasHeight ??
viewport.element?.clientHeight ??
1;
const canvasPoint = getCenterCanvasPoint(canvasWidth, canvasHeight);
const worldPoint = resolvedView?.canvasToWorld(canvasPoint);
const rendererCamera = resolvedView?.toICamera();
const view = resolvedView?.state?.view;
const zoom = Math.max(view?.getZoom?.() ?? viewState.zoom ?? 1, 0.001);
const rotation = view?.getRotation?.() ?? viewState.rotation ?? 0;
const frameOfReferenceUID =
request.frameOfReferenceUID ??
resolvedView?.getFrameOfReferenceUID() ??
viewport.getFrameOfReferenceUID?.();
return {
kind: WSI_PROJECTION_ID,
adapterId: WSI_PROJECTION_ID,
canvasHeight,
canvasWidth,
dataId: request.dataId,
frameOfReferenceUID,
presentation: {
position: {
kind: 'anchor',
worldPoint,
canvasPoint: clonePoint2(canvasPoint),
},
rotation,
scale: getScale({ canvasHeight, rendererCamera, zoom }),
zoom,
},
rendererCamera,
resolvedView,
spaces: {
canvas: Boolean(resolvedView),
image: true,
renderer: Boolean(rendererCamera),
world: Boolean(resolvedView),
},
transforms: resolvedView
? {
canvasToWorld: (point) => resolvedView.canvasToWorld(point),
worldToCanvas: (point: Point3) => resolvedView.worldToCanvas(point),
}
: undefined,
viewState,
viewportType: viewport.type,
};
}
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