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triggerEvent,
eventTarget,
getRenderingEngine,
Enums,
Types,
} from '@cornerstonejs/core';
import { Events as csToolsEvents } from '../../enums';
import {
getToolGroup,
getToolGroupForViewport,
} from '../../store/ToolGroupManager';
import SegmentationDisplayTool from '../../tools/displayTools/SegmentationDisplayTool';
import { SegmentationRenderedEventDetail } from '../../types/EventTypes';
/**
* SegmentationRenderingEngine is a class that is responsible for rendering
* segmentations for a toolGroup. It will call SegmentationDisplayTool to render the segmentation
* based on the segmentation data and their configurations. Note: This is a Singleton class
* and should not be instantiated directly. To trigger a render for all the
* segmentations of a tool group you can use.
*
* ```
* triggerSegmentationRender(toolGroupId)
* ```
*/
class SegmentationRenderingEngine {
private _needsRender: Set<string> = new Set();
private _animationFrameSet = false;
private _animationFrameHandle: number | null = null;
public hasBeenDestroyed: boolean;
public removeToolGroup(toolGroupId) {
this._needsRender.delete(toolGroupId);
Eif (this._needsRender.size === 0) {
this._reset();
}
}
public renderToolGroupSegmentations(toolGroupId): void {
this._setToolGroupSegmentationToBeRenderedNextFrame([toolGroupId]);
}
/**
* _throwIfDestroyed Throws an error if trying to interact with the `RenderingEngine`
* instance after its `destroy` method has been called.
*/
private _throwIfDestroyed() {
Iif (this.hasBeenDestroyed) {
throw new Error(
'this.destroy() has been manually called to free up memory, can not longer use this instance. Instead make a new one.'
);
}
}
private _setToolGroupSegmentationToBeRenderedNextFrame(
toolGroupIds: string[]
) {
// Add the viewports to the set of flagged viewports
toolGroupIds.forEach((toolGroupId) => {
this._needsRender.add(toolGroupId);
});
// Render any flagged viewports
this._render();
}
/**
* _render Sets up animation frame if necessary
*/
private _render() {
// If we have viewports that need rendering and we have not already
// set the RAF callback to run on the next frame.
if (this._needsRender.size > 0 && this._animationFrameSet === false) {
this._animationFrameHandle = window.requestAnimationFrame(
this._renderFlaggedToolGroups
);
// Set the flag that we have already set up the next RAF call.
this._animationFrameSet = true;
}
}
private _renderFlaggedToolGroups = () => {
this._throwIfDestroyed();
// for each toolGroupId insides the _needsRender set, render the segmentation
const toolGroupIds = Array.from(this._needsRender.values());
for (const toolGroupId of toolGroupIds) {
this._triggerRender(toolGroupId);
// This viewport has been rendered, we can remove it from the set
this._needsRender.delete(toolGroupId);
// If there is nothing left that is flagged for rendering, stop here
// and allow RAF to be called again
Eif (this._needsRender.size === 0) {
this._animationFrameSet = false;
this._animationFrameHandle = null;
return;
}
}
};
_triggerRender(toolGroupId) {
const toolGroup = getToolGroup(toolGroupId);
Iif (!toolGroup) {
console.warn(`No tool group found with toolGroupId: ${toolGroupId}`);
return;
}
const { viewportsInfo } = toolGroup;
const viewports = [];
viewportsInfo.forEach(({ viewportId, renderingEngineId }) => {
const renderingEngine = getRenderingEngine(renderingEngineId);
Iif (!renderingEngine) {
console.warn('rendering Engine has been destroyed');
return;
}
viewports.push(renderingEngine.getViewport(viewportId));
});
const segmentationDisplayToolInstance = toolGroup.getToolInstance(
SegmentationDisplayTool.toolName
) as SegmentationDisplayTool;
Iif (!segmentationDisplayToolInstance) {
console.warn('No segmentation tool found inside', toolGroupId);
return;
}
function onSegmentationRender(evt: Types.EventTypes.ImageRenderedEvent) {
const { element, viewportId, renderingEngineId } = evt.detail;
element.removeEventListener(
Enums.Events.IMAGE_RENDERED,
onSegmentationRender as EventListener
);
const toolGroup = getToolGroupForViewport(viewportId, renderingEngineId);
Iif (!toolGroup) {
console.warn('toolGroup has been destroyed');
return;
}
const eventDetail: SegmentationRenderedEventDetail = {
toolGroupId: toolGroup.id,
viewportId,
};
triggerEvent(eventTarget, csToolsEvents.SEGMENTATION_RENDERED, {
...eventDetail,
});
}
// Todo: for other representations we probably need the drawSVG, but right now we are not using it
// drawSvg(element, (svgDrawingHelper) => {
// const handleDrawSvg = (tool) => {
// if (tool instanceof SegmentationDisplayTool && tool.renderAnnotation) {
// tool.renderAnnotation({ detail: eventDetail })
// triggerEvent(element, csToolsEvents.SEGMENTATION_RENDERED, { ...eventDetail })
// }
// }
// enabledTools.forEach(handleDrawSvg)
// })
viewports.forEach(({ element }) => {
element.addEventListener(
Enums.Events.IMAGE_RENDERED,
onSegmentationRender
);
});
segmentationDisplayToolInstance.renderSegmentation(toolGroupId);
}
/**
* _reset Resets the `RenderingEngine`
*/
private _reset() {
window.cancelAnimationFrame(this._animationFrameHandle);
this._needsRender.clear();
this._animationFrameSet = false;
this._animationFrameHandle = null;
}
}
const segmentationRenderingEngine = new SegmentationRenderingEngine();
/**
* It triggers a render for all the segmentations of the tool group with the given Id.
* @param toolGroupId - The Id of the tool group to render.
*/
function triggerSegmentationRender(toolGroupId: string): void {
segmentationRenderingEngine.renderToolGroupSegmentations(toolGroupId);
}
export { segmentationRenderingEngine, triggerSegmentationRender };
export default triggerSegmentationRender;
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