Mazes - The Essential Guide to HTML5 - page 253

Code Explanation

t=0.0; }

else if (t>1.0) {

t = 1.0;

}

dx = (sx+t*(fx-sx))-cx;

dy = (sy +t*(fy-sy))-cy;

rt = (dx*dx) +(dy*dy);

if (rt<(rad*rad)) {

return true; }

else {

return false;}

}

function getwalls() {

var swalls;

var sw;

var i;

var sx;

var sy;

var fx;

var fy;

var curwall;