Image mark

[mbostock]

Supersedes #459. Fixes #157.

TODO

• width and height instead of r
• width defaults to height and vice versa
• src instead of href
• ignore fill and stroke attributes
• opacity attribute
• allow src to be a constant
• documentation

[RLesser]

Thanks for incorporating this Mike!

[Fil]

How would we allow for clipping—for example, for the very common task of making rounded avatars?

[mbostock]

How would we allow for clipping—for example, for the very common task of making rounded avatars?

My thinking is we could reintroduce the r channel for this. Or we could introduce another mark type. Or we could add an image channel for the dot mark. Or we could have some generic clipping mechanism that could apply to all mark types?