gridSize option should accept function

[alexandernst]

The constructor of joint.dia.Paper receives gridSize as one of it's parameters. If set, the paper will behave grid-like, letting me place elements only at the intersections of each vertical and horizontal line of the grid (instead of letting me freely position elements wherever I want).

This is exactly what I want for my elements, but not for my links. If I set the grid size option and then start dragging the end of a link around the paper, it will "jump" from "point" to "point" on the paper.

This is a cross-post from https://groups.google.com/g/jointjs/c/391JoaUh01Q

/cc @kumilingus

[alexandernst]

Hi Roman! Any news on this?

[kumilingus]

No progress yet. This workaround should help though:

paper.on('cell:pointerdown', function(cellView) {
    paper.options.gridSize = (cellView.model.isElement()) ? 50 : 1;
});

[github-actions]

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