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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 | import type { Point2, Point3 } from '../../../types';
import type { ProjectionScale } from '../ViewportProjectionTypes';
import {
ECG_PROJECTION_ID,
type ECGProjectionRequest,
type ECGProjectionSnapshot,
} from './ECGProjectionTypes';
import { normalizeECGViewState } from './ecgViewportCamera';
import type { ECGViewState } from './ECGViewportTypes';
/**
* Clones a canvas-space point so projection snapshots cannot leak mutable
* tuple references from resolved views.
*/
function clonePoint2(point: Point2): Point2 {
return [point[0], point[1]];
}
/**
* Returns the center canvas point used as the default projection anchor.
*/
function getCenterCanvasPoint(
canvasWidth: number,
canvasHeight: number
): Point2 {
return [canvasWidth / 2, canvasHeight / 2];
}
/**
* Derives signal-space sampling density from the resolved canvas transform.
*/
function getSignalScale(
resolvedView: NonNullable<ECGProjectionSnapshot['resolvedView']>
): ProjectionScale {
const origin = resolvedView.canvasToWorld([0, 0]);
const nextSample = resolvedView.canvasToWorld([1, 0]);
const nextValue = resolvedView.canvasToWorld([0, 1]);
return {
kind: 'signal',
samplesPerCanvasPixel: Math.abs(nextSample[0] - origin[0]) || 0,
valueUnitsPerCanvasPixel: Math.abs(nextValue[1] - origin[1]) || 0,
};
}
/**
* Returns the best available ECG projection scale for the snapshot.
*/
function getScale(
resolvedView: ECGProjectionSnapshot['resolvedView'],
zoom: number
): ProjectionScale {
if (!resolvedView) {
return { kind: 'fit', value: zoom };
}
return getSignalScale(resolvedView);
}
/**
* Converts an ECG world tuple into a tagged signal projection position.
*/
function getSignalPosition(
worldPoint: Point3 | undefined,
canvasPoint: Point2
): ECGProjectionSnapshot['presentation']['position'] | undefined {
if (!worldPoint) {
return;
}
return {
kind: 'signalPoint',
sampleIndex: worldPoint[0],
value: worldPoint[1],
channelIndex: worldPoint[2],
canvasPoint,
};
}
/**
* Builds the signal-space ECG projection snapshot for a viewport-like object.
*/
export function getECGProjectionSnapshot(
request: ECGProjectionRequest
): ECGProjectionSnapshot | undefined {
const { viewport } = request;
const currentViewState = request.viewState ?? viewport.getViewState?.();
if (!currentViewState) {
return;
}
const viewState = normalizeECGViewState(currentViewState);
const resolvedView = request.resolvedView ?? viewport.getResolvedView?.();
const canvasWidth =
request.canvasWidth ??
resolvedView?.state?.canvas?.clientWidth ??
viewport.canvas?.clientWidth ??
viewport.element?.clientWidth ??
1;
const canvasHeight =
request.canvasHeight ??
resolvedView?.state?.canvas?.clientHeight ??
viewport.canvas?.clientHeight ??
viewport.element?.clientHeight ??
1;
const canvasPoint = getCenterCanvasPoint(canvasWidth, canvasHeight);
const signalPoint = resolvedView?.canvasToWorld(canvasPoint);
const zoom = resolvedView?.zoom ?? Math.max(viewState.scale ?? 1, 0.001);
const rawPan = resolvedView?.pan ?? [0, 0];
const rendererCamera = resolvedView?.toICamera();
const frameOfReferenceUID =
request.frameOfReferenceUID ??
resolvedView?.getFrameOfReferenceUID() ??
viewport.getFrameOfReferenceUID?.();
return {
kind: ECG_PROJECTION_ID,
adapterId: ECG_PROJECTION_ID,
canvasHeight,
canvasWidth,
dataId: request.dataId,
frameOfReferenceUID,
presentation: {
pan: clonePoint2(rawPan),
position: getSignalPosition(signalPoint, canvasPoint),
rawPan: clonePoint2(rawPan),
scale: getScale(resolvedView, zoom),
zoom,
},
rendererCamera,
resolvedView,
spaces: {
canvas: true,
image: false,
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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