MAKING A PROJECTILE: EXTREMELY DESPERATE!!!!!

//Get the position vector of the mouse when pressed and turn them into variables.

function t2dSceneWindow::onMouseDown(%this, %modifier, %worldPosition, %clicks)
{
     $startPosition = %worldPosition; //Vector for when mouse is clicked

     $dX = getWord(%worldPosition, 0); //X position when mouse is pressed down.
     $dY = getWord(%worldPosition, 1); //Y position when mouse is pressed down.
}

//Get the position vector of the mouse when released and turn them into variables.

function t2dSceneWindow::onMouseUp(%this, %modifier, %worldPosition, %clicks)
{
     $endPosition = %worldPosition;

     $rX = getWord(%worldPosition, 0); //X position when mouse is released.
     $rY = getWord(%worldPosition, 1); //Y position when mouse is released.

     //Execute the functions for getting the angle and power. Then creating the velocity for the arrow.
     convertAngle();
     convertPower();
     convertVelocity();

     //Launch the arrow.
     shootArrow();
}

function convertAngle()
{
     %xSlope = ($dX - $rX);
     %ySlope = ($dY - $rY);

     $angle = mRadToDeg(mAtan(%xSlope, %ySlope)); //Get the arctan of the slopes. Then convert it to degrees.
}

function convertPower()
{
     $distance = t2dVectorDistance($startPosition, $endPosition); //Get the distance between the click and the release.

     //Keep the power from going over 30.
     if($distance > 30)
     {
          $power = 1;
     }
     else
     {
          $power = $distance / 30;
     }
}

function convertVelocity()
{
     //Get the power for how far the arrow will go.
     if ($angle > 90)
     {
          $arrowX = (90 - ($angle - 90)) * $power;
     }
     else
     {
          $arrowX = $angle * $power;
     }

     //Get the height for the arrow.
     $arrowY = ($angle - 90) * $power * -1;
}

function shootArrow() {
     %arrow = new t2dStaticSprite()
     {
          scenegraph = SceneWindow2D.getSceneGraph();
          position = "-44.0 -9.5";
          imageMap = "silverBoltImageMap";
          class = "silverBolt";
    	  CollisionActiveSend = "1";
          CollisionActiveReceive = "1";
          CollisionPolyList = "-0.250 -0.250 0.250 -0.250 0.250 0.250 -0.250 0.250";
          ConstantForce = "0.000 35.000";    
          ConstantForceGravitic = "1";    
          mountID = "20";
	};
	%arrow.setLinearVelocityX($arrowX);
	%arrow.setLinearVelocityY($arrowY);
}

function silverBolt::onTimer(%this)
{
     %X = $arrow.getLinearVelocityX();
     %Y = $arrow.getLinearVelocityY();

     %temp = (%Y / %X);

     $arrow.setRotation(%temp);
}

%Y / %X
%X / %Y
(%X + %Y) / 2

%temp = mTan(%X, %Y);