When using layers, "TypeError: newTranslation is undefined" is thrown

[magjac]

It seems to render the first layer correctly, but is unclear what will happen if you try to render another graph using the same Graphviz renderer.

The following DOT code from the FAQ, makes d3-graphviz throw TypeError: newTranslation is undefined at https://github.com/magjac/d3-graphviz/blob/master/src/zoom.js#L61.

digraph G {
	layers="local:pvt:test:new:ofc";

	node1  [layer="pvt"];
	node2  [layer="all"];
	node3  [layer="pvt:ofc"];		/* pvt, test, new, and ofc */
	node2 -> node3  [layer="pvt:all"];	/* same as pvt:ofc */
	node2 -> node4 [layer=3];		/* same as test */
}

Some more background info can be found at:

https://forum.graphviz.org/t/how-to-share-svg-files/101
https://forum.graphviz.org/t/getting-layers-to-work-with-svg/107

[magjac]

Note also enhancement proposal #164.