javascript - SVG donut-shape with access of both circles -



javascript - SVG donut-shape with access of both circles -

i want create svg donut shape (circle empty circle inside). want able access & resize both circles, eg via id attributes. allow animation.

i have considered 3 approaches none great:

complex path: not allow access of inner circle via #id outline stroke: possible complicated purpose (would have reposition increment stroke) clippath/mask: doesn't work compound path, outer box

is there way of doing this?

probably easiest way masks.

if working set of discrete donut sizes, utilize css , mask each size:

<svg width="500" height="500"> <defs> <mask id="bigmask"> <rect width="100%" height="100%" fill="white"/> <circle cx="250" cy="250" r="50"/> </mask> <mask id="smallmask"> <circle cx="250" cy="250" r="150" fill="white"/> <circle cx="250" cy="250" r="100"/> </mask> </defs> <circle id="donut" cx="250" cy="250" r="200" mask="url(#bigmask)"/> </svg>

css:

#donut:hover { mask: url(#smallmask); }

demo here

unfortunately can't modify size of circles css. "r" not (yet) property can manipulated css. need either utilize smil (svg) animation, or manipulate mask circles javascript:

<svg width="500" height="500"> <defs> <mask id="donutmask"> <circle id="outer" cx="250" cy="250" r="200" fill="white"/> <circle id="inner" cx="250" cy="250" r="50"/> </mask> </defs> <circle id="donut" cx="250" cy="250" r="200" mask="url(#donutmask)"/> </svg>

js

$("#donut").mouseenter(function(evt) { $("#outer").attr("r", 100 + math.random() * 100); $("#inner").attr("r", 100 - math.random() * 50); });

demo here

javascript svg

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