Bar graph added.

node_modules/vega-parser/src/parsers/guides/axis-title.js

@@ -0,0 +1,82 @@
+import {getSign, ifTop, ifX, ifY, mult, patch} from './axis-util';
+import {Bottom, GuideTitleStyle, Top, one, zero} from './constants';
+import guideMark from './guide-mark';
+import {alignExpr, anchorExpr, lookup} from './guide-util';
+import {addEncoders, encoder, has} from '../encode/util';
+import {TextMark} from '../marks/marktypes';
+import {AxisTitleRole} from '../marks/roles';
+import {extend} from 'vega-util';
+
+export default function(spec, config, userEncode, dataRef) {
+  var _ = lookup(spec, config),
+      orient = spec.orient,
+      sign = getSign(orient, -1, 1),
+      encode, enter, update, titlePos;
+
+  encode = {
+    enter: enter = {
+      opacity: zero,
+      anchor: encoder(_('titleAnchor', null)),
+      align: {signal: alignExpr}
+    },
+    update: update = extend({}, enter, {
+      opacity: one,
+      text: encoder(spec.title)
+    }),
+    exit: {
+      opacity: zero
+    }
+  };
+
+  titlePos = {
+    signal: `lerp(range("${spec.scale}"), ${anchorExpr(0, 1, 0.5)})`
+  };
+
+  update.x = ifX(orient, titlePos);
+  update.y = ifY(orient, titlePos);
+  enter.angle = ifX(orient, zero, mult(sign, 90));
+  enter.baseline = ifX(orient, ifTop(orient, Bottom, Top), {value: Bottom});
+  update.angle = enter.angle;
+  update.baseline = enter.baseline;
+
+  addEncoders(encode, {
+    fill:        _('titleColor'),
+    fillOpacity: _('titleOpacity'),
+    font:        _('titleFont'),
+    fontSize:    _('titleFontSize'),
+    fontStyle:   _('titleFontStyle'),
+    fontWeight:  _('titleFontWeight'),
+    limit:       _('titleLimit'),
+    lineHeight:  _('titleLineHeight')
+  }, { // require update
+    align:       _('titleAlign'),
+    angle:       _('titleAngle'),
+    baseline:    _('titleBaseline')
+  });
+
+  autoLayout(_, orient, encode, userEncode);
+  encode.update.align = patch(encode.update.align, enter.align);
+  encode.update.angle = patch(encode.update.angle, enter.angle);
+  encode.update.baseline = patch(encode.update.baseline, enter.baseline);
+
+  return guideMark({
+    type:  TextMark,
+    role:  AxisTitleRole,
+    style: GuideTitleStyle,
+    from:  dataRef,
+    encode
+  }, userEncode);
+}
+
+function autoLayout(_, orient, encode, userEncode) {
+  const auto = (value, dim) => value != null
+    ? (encode.update[dim] = patch(encoder(value), encode.update[dim]), false)
+    : !has(dim, userEncode) ? true : false;
+
+  const autoY = auto(_('titleX'), 'x'),
+        autoX = auto(_('titleY'), 'y');
+
+  encode.enter.auto = autoX === autoY
+    ? encoder(autoX)
+    : ifX(orient, encoder(autoX), encoder(autoY));
+}