#123 two color bonds

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5
2012-10-08
2009-02-21
No

The old jcp, and other drawing programs, could draw bonds with the colors of the atoms at their endpoints.

What this requires, is line elements with start and end colors, and for the visitor to draw half lines of each color.

An alternative would be to generate half lines, with a single color. This might be better, as it won't require changes to the visitors.

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