Support richer axis & legend title text layout.

The titleAlign property does not seem to work as expected in v3.0.0-rc12. With the following spec that tries to right-align all the titles:

{
  "$schema": "https://vega.github.io/schema/vega-lite/v3.json",
  "data": {"url": "data/barley.json"},
  "mark": "bar",
  "encoding": {
    "x": {"aggregate": "sum", "field": "yield", "type": "quantitative", "axis": { "titleAlign": "right"}},
    "y": {"field": "variety", "type": "nominal", "axis": { "titleAlign": "right"}},
    "color": {"field": "site", "type": "nominal", "legend": { "titleAlign": "right"}}
  }
}

the output has the titles pushed leftward. They should (presumably) be aligned against the right edge of the legend/axis.

[jheer]

The titleAlign field maps to the align encoding channel for a text mark. It determines only how the text is oriented relative to its x/y anchor point, it does not change that anchor point.

If you change the title position (set the title x-coordinate to the width of the legend) you can get the desired effect!

[roying]

What I meant is a way to get all the parameters (data backing) the legend from Vega view API so custom legends (and perhaps “plugins”) can be implemented in javascript (similar to Vega’s support for tooltip). For example: view.data(“mylegend”)