@antv/x6/es/registry/filter/drop-shadow.js

JavaScript diagramming library that uses SVG and HTML for rendering.

import { getString, getNumber } from './util';
export function dropShadow(args = {}) {
    const dx = getNumber(args.dx, 0);
    const dy = getNumber(args.dy, 0);
    const color = getString(args.color, 'black');
    const blur = getNumber(args.blur, 4);
    const opacity = getNumber(args.opacity, 1);
    return 'SVGFEDropShadowElement' in window
        ? `<filter>
         <feDropShadow stdDeviation="${blur}" dx="${dx}" dy="${dy}" flood-color="${color}" flood-opacity="${opacity}" />
       </filter>`.trim()
        : `<filter>
         <feGaussianBlur in="SourceAlpha" stdDeviation="${blur}" />
         <feOffset dx="${dx}" dy="${dy}" result="offsetblur" />
         <feFlood flood-color="${color}" />
         <feComposite in2="offsetblur" operator="in" />
         <feComponentTransfer>
           <feFuncA type="linear" slope="${opacity}" />
         </feComponentTransfer>
         <feMerge>
           <feMergeNode/>
           <feMergeNode in="SourceGraphic"/>
         </feMerge>
       </filter>`.trim();
}
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