Closest Circle Point //JavaScript Function
Given a dot and a circle, it returns the nearest dot over the circle.
[UPDATED CODE AND HELP CAN BE FOUND HERE]
//+ 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 }; };
