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Closest Circle Point //JavaScript Function
<a href="http://jsfromhell.com/math/closest-circle-point">
Given a dot and a circle, it returns the nearest dot over the circle.
[UPDATED CODE AND HELP CAN BE FOUND HERE]
</a>
//+ Jonas Raoni Soares Silva
//@ http://jsfromhell.com/math/closest-circle-point [v1.0]
closestCirclePoint = function( px, py, x, y, ray ){
var tg = ( x += ray, y += ray, 0 );
return function( x, y, x0, y0 ){ return Math.sqrt( ( x -= x0 ) * x + ( y -= y0 ) * y ); }( px, py, x, y ) > ray ?
{ x: Math.cos( tg = Math.atan2( py - y, px - x ) ) * ray + x, y: Math.sin( tg ) * ray + y }
//{ x: ( px - x ) / ( length / ray ) + x, y: ( py - y ) / ( length / ray ) + y }
: { x: px, y: py };
};
