angle between two points in javascript
//--------- to get angle between two points --------- //---param--- //@x1,x2,y1,y2 : cordinates of 2 points //@return: theta(value in degrees) function getTanTheta(x1,y1,x2,y2) { var y = eval(y2)-eval(y1); var x = eval(x2)-eval(x1); if(y < 0) { y = -y;} if(x < 0) { x = -x;} //alert(y+' '+x); var tanTheta = y/x; if(tanTheta < 0) { tanTheta = -x;} tanTheta = roundNumber(tanTheta,3); //alert(tanTheta); return tanTheta; }