vega-scenegraph/src/util/serialize.js

Vega scenegraph and renderers.

import boundMark from '../bound/boundMark';

const keys = [
  'marktype', 'name', 'role', 'interactive', 'clip', 'items', 'zindex',
  'x', 'y', 'width', 'height', 'align', 'baseline',             // layout
  'fill', 'fillOpacity', 'opacity', 'blend',                    // fill
  'stroke', 'strokeOpacity', 'strokeWidth', 'strokeCap',        // stroke
  'strokeDash', 'strokeDashOffset',                             // stroke dash
  'strokeForeground', 'strokeOffset',                           // group
  'startAngle', 'endAngle', 'innerRadius', 'outerRadius',       // arc
  'cornerRadius', 'padAngle',                                   // arc, rect
  'cornerRadiusTopLeft', 'cornerRadiusTopRight',                // rect, group
  'cornerRadiusBottomLeft', 'cornerRadiusBottomRight',
  'interpolate', 'tension', 'orient', 'defined',                // area, line
  'url', 'aspect', 'smooth',                                    // image
  'path', 'scaleX', 'scaleY',                                   // path
  'x2', 'y2',                                                   // rule
  'size', 'shape',                                              // symbol
  'text', 'angle', 'theta', 'radius', 'dir', 'dx', 'dy',        // text
  'ellipsis', 'limit', 'lineBreak', 'lineHeight',
  'font', 'fontSize', 'fontWeight', 'fontStyle', 'fontVariant', // font
  'description', 'aria', 'ariaRole', 'ariaRoleDescription'      // aria
];

export function sceneToJSON(scene, indent) {
  return JSON.stringify(scene, keys, indent);
}

export function sceneFromJSON(json) {
  const scene = (typeof json === 'string' ? JSON.parse(json) : json);
  return initialize(scene);
}

function initialize(scene) {
  var type = scene.marktype,
      items = scene.items,
      parent, i, n;

  if (items) {
    for (i=0, n=items.length; i<n; ++i) {
      parent = type ? 'mark' : 'group';
      items[i][parent] = scene;
      if (items[i].zindex) items[i][parent].zdirty = true;
      if ('group' === (type || parent)) initialize(items[i]);
    }
  }

  if (type) boundMark(scene);
  return scene;
}