Get mouse coordinates and fire bullet.

Question

So far here is my code in the fla:
import flash.events.MouseEvent;
Mouse.hide();
main_crosshair.startDrag(true);
main_crosshair.addEventListener(MouseEvent.MOUSE_DOWN, crosshairFX);
function crosshairFX (e:MouseEvent):void{
          var projectile:bullet = new bullet();
          addChild(projectile);
          main_crosshair.gotoAndPlay(3);
          trace(crosshairX);
          trace(crosshairY);
and this is my bullet.as :
package {
          import flash.display.MovieClip;
          public class bullet extends MovieClip {
Im trying to figure out how ot make it so that when I click my mouse it fires the bullet from the bottom right of the screen towards my cursor. That is the part I need help with now then I;m going to try and figure out myself how to test if an object is hit. Thanks in advance for any help.
var PositionY:Number;
var PositionX:Number;
var crosshairX:* = Mouse.x;
var crosshairY:* = Mouse.y;
stage.addEventListener(MouseEvent.MOUSE_MOVE, onMouseMove);
function onMouseMove(e:MouseEvent){
          var target:* = e.target;
          var location:Point = new Point(target.mouseX, target.mouseY);
          location = target.localToGlobal(location);
          PositionY = location.y;
          PositionX = location.x;

Answer 1

Since you basically want to shoot something at an angle, the code should be pretty much the same.  You know where the origin of the bullet is (projectile.x/projectile.y) and you know where the destination points are (mouseX/mouseY).  That tutorial will help  show you how to use the Atan2 method to make an object travel from one place to another.