Bar graph added.

node_modules/vega-functions/src/functions/scale.js

@@ -0,0 +1,39 @@
+import {getScale} from '../scales';
+import {bandSpace} from 'vega-scale';
+import {isArray} from 'vega-util';
+
+export function bandspace(count, paddingInner, paddingOuter) {
+  return bandSpace(count || 0, paddingInner || 0, paddingOuter || 0);
+}
+
+export function bandwidth(name, group) {
+  const s = getScale(name, (group || this).context);
+  return s && s.bandwidth ? s.bandwidth() : 0;
+}
+
+export function copy(name, group) {
+  const s = getScale(name, (group || this).context);
+  return s ? s.copy() : undefined;
+}
+
+export function domain(name, group) {
+  const s = getScale(name, (group || this).context);
+  return s ? s.domain() : [];
+}
+
+export function invert(name, range, group) {
+  const s = getScale(name, (group || this).context);
+  return !s ? undefined
+    : isArray(range) ? (s.invertRange || s.invert)(range)
+    : (s.invert || s.invertExtent)(range);
+}
+
+export function range(name, group) {
+  const s = getScale(name, (group || this).context);
+  return s && s.range ? s.range() : [];
+}
+
+export function scale(name, value, group) {
+  const s = getScale(name, (group || this).context);
+  return s ? s(value) : undefined;
+}