CODEWITHSUNDEEP
javascriptraphael
Alex Morris
Alex Morris

Reputation: 65

Explanation of Raphael js drag and drop?

view-source:http://raphaeljs.com/touches.html

http://raphaeljs.com/touches.html

I'd love it if somebody explained why this drag 'n' drop example works. I can gather roughly what each function is doing but I can't piece together why this moves when there's nothing telling it to move.

Upvotes: 2

Views: 1732

Answers (1)

Will Morgan
Will Morgan

Reputation: 4490

The move function behaves as a callback, and it takes 2 arguments, dx, dy. They stand for delta-X and delta-Y respectively.

If you see this line:

this.attr({cx: this.ox + dx, cy: this.oy + dy});

Then you will notice that ox and oy stand for original-X and original-Y respectively.

Thus you can deduct that the attr function is being called with arguments that specify original X + delta X and original Y + delta Y.

Make sense?

Do not get confused with the animate calls - they are for expanding/contracting the shape on start/stop. Every time you move the mouse, the move function is called, and the attr is updated.

Upvotes: 3

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