phaser.js

velocityFromAngle: function (angle, speed, point) {

  if (speed === undefined) { speed = 60; }
  point = point || new Phaser.Point();

  return point.setTo((Math.cos(this.game.math.degToRad(angle)) * speed), (Math.sin(this.game.math.degToRad(angle)) * speed));

}

Phaser.Math.degToRad = function degToRad (degrees) {
  return degrees * degreeToRadiansFactor;
};

angleToPointer: function (displayObject, pointer, world) {

  if (pointer === undefined) { pointer = this.game.input.activePointer; }
  if (world === undefined) { world = false; }

  if (world)
  {
    return Math.atan2(pointer.worldY - displayObject.world.y, pointer.worldX - displayObject.world.x);
  }
  else
  {
    return Math.atan2(pointer.worldY - displayObject.y, pointer.worldX - displayObject.x);
  }

}