vega-scenegraph/src/marks/markMultiItemPath.js

Vega scenegraph and renderers.

import boundStroke from '../bound/boundStroke';
import context from '../bound/boundContext';
import {intersectPoint} from '../util/intersect';
import {drawOne} from '../util/canvas/draw';
import {hitPath} from '../util/canvas/pick';

export default function(type, shape, tip) {

  function attr(emit, item) {
    var items = item.mark.items;
    if (items.length) emit('d', shape(null, items));
  }

  function bound(bounds, mark) {
    var items = mark.items;
    if (items.length === 0) {
      return bounds;
    } else {
      shape(context(bounds), items);
      return boundStroke(bounds, items[0]);
    }
  }

  function draw(context, items) {
    context.beginPath();
    shape(context, items);
  }

  const hit = hitPath(draw);

  function pick(context, scene, x, y, gx, gy) {
    var items = scene.items,
        b = scene.bounds;

    if (!items || !items.length || b && !b.contains(gx, gy)) {
      return null;
    }

    x *= context.pixelRatio;
    y *= context.pixelRatio;
    return hit(context, items, x, y) ? items[0] : null;
  }

  return {
    type:   type,
    tag:    'path',
    nested: true,
    attr:   attr,
    bound:  bound,
    draw:   drawOne(draw),
    pick:   pick,
    isect:  intersectPoint,
    tip:    tip
  };

}