Is it possible to add a background image to a plot in vega or vega-lite?

问题

I see from https://vega.github.io/vega-lite/docs/config.html that it is possible to change the background color. But i don't see any docs for adding an underlay background image.

回答1:

vega-lite creates a canvas element.

So adding a background image is explained in a question about how to add a background to a canvas element.

HTML5 Canvas background image

But you can just do it with css:

canvas {
  background: url("my_background.png");
}

This is just like any other background image css.

https://developer.mozilla.org/en-US/docs/Web/CSS/background-image

来源：https://stackoverflow.com/questions/49580080/is-it-possible-to-add-a-background-image-to-a-plot-in-vega-or-vega-lite