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drawPolyline.ts
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drawPolyline.ts
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import type { Types } from '@cornerstonejs/core';
import _getHash from './_getHash';
import setNewAttributesIfValid from './setNewAttributesIfValid';
import setAttributesIfNecessary from './setAttributesIfNecessary';
import { SVGDrawingHelper } from '../types';
/**
* Draws an SVG polyline with the given points.
*
* The `closePath` option, if true, draws a closed polyline, with the
* last point connected to the first.
*/
export default function drawPolyline(
svgDrawingHelper: SVGDrawingHelper,
annotationUID: string,
polylineUID: string,
points: Types.Point2[],
options: {
color?: string;
fillColor?: string;
fillOpacity?: number;
width?: number;
lineWidth?: number;
lineDash?: string;
closePath?: boolean;
}
): void {
if (points.length < 2) {
return;
}
const {
color = 'rgb(0, 255, 0)',
width = 10,
fillColor = 'none',
fillOpacity = 0,
lineWidth,
lineDash,
closePath = false,
} = options;
// for supporting both lineWidth and width options
const strokeWidth = lineWidth || width;
const svgns = 'http://www.w3.org/2000/svg';
const svgNodeHash = _getHash(annotationUID, 'polyline', polylineUID);
const existingPolyLine = svgDrawingHelper.getSvgNode(svgNodeHash);
let pointsAttribute = '';
for (const point of points) {
pointsAttribute += `${point[0].toFixed(1)}, ${point[1].toFixed(1)} `;
}
if (closePath) {
const firstPoint = points[0];
pointsAttribute += `${firstPoint[0]}, ${firstPoint[1]}`;
}
const attributes = {
points: pointsAttribute,
stroke: color,
fill: fillColor,
'fill-opacity': fillOpacity,
'stroke-width': strokeWidth,
'stroke-dasharray': lineDash,
};
if (existingPolyLine) {
// This is run to avoid re-rendering annotations that actually haven't changed
setAttributesIfNecessary(attributes, existingPolyLine);
svgDrawingHelper.setNodeTouched(svgNodeHash);
} else {
const newPolyLine = document.createElementNS(svgns, 'polyline');
setNewAttributesIfValid(attributes, newPolyLine);
svgDrawingHelper.appendNode(newPolyLine, svgNodeHash);
}
}