Pfthb

I want to shoot a bullet in the direction the tank is facing. I use Accelerometer to control the angle of my tank. i want my tank to shoot on the direction it is facing as i tilt my device.
With my current script it only shoots vertically. 

To duplicate the problem i couldn't shrink my code than this

from kivy.app import App
from kivy.uix.image import Image
from kivy.uix.widget import Widget
from kivy.properties import NumericProperty, ReferenceListProperty, ObjectProperty,ListProperty, BooleanProperty
from kivy.vector import Vector
from kivy.clock import Clock
import random
import math
from plyer import accelerometer
from kivy.lang import Builder

Builder.load_string("""
<Tank>:
 canvas.before:
 PushMatrix

 Rotate:
 angle: self.angle
 origin: self.center
 canvas.after:
 PopMatrix
<Flame>:
 canvas.before:
 PushMatrix

 Rotate:
 angle: self.angle
 origin: self.center

 canvas.after:
 PopMatrix
<AccelerometerGun>:
 tank: tank
 x_label: x_label
 canvas:
 Rectangle:
 source: "wood.png"
 #texture: root.bg_image.texture#source: "images/bg.png"
 size: self.size#root.size[0]+200, root.size[1]
 pos: self.pos#root.pos
 Label:
 id: x_label
 text: "Tilt value "
 center: self.parent.center
 Tank:
 id: tank
 center: (root.width/2, 70) #self.parent.center
""") 
class Flame(Image):
 velocity_x = NumericProperty(0)
 active = BooleanProperty(False)
 velocity_y = NumericProperty(0)
 velocity = ReferenceListProperty(velocity_x, velocity_y)
 angle = NumericProperty(0)
 def __init__(self, **kwargs):
 super(Flame, self).__init__(**kwargs)
 self.size_hint=(None, None)
 self.source = "zn.zip"
 self.anim_delay= 0.35
 self.anim_loop = 1
 rs = random.randint(70, 80)
 self.size = (rs, rs)
 self.bind(active=self.addV)
 def addV(self, *args):
 self.velocity_y += random.uniform(20.0, 25.0)
 self.velocity_x += 0
 def move(self, pa):
 self.pos = Vector(*self.velocity) + self.pos
 self.angle = random.randint(0, 360)
 self.size = (self.size[0]+1, self.size[1]+1)
 if (self.y > pa.top/1.6):
 pa.removeThis(self)
 self.velocity_y = 0
 self.velocity_x = 0
class Tank(Image):
 velocity_x = NumericProperty(0)
 activated = BooleanProperty(False)
 velocity_y = NumericProperty(0)
 velocity = ReferenceListProperty(velocity_x, velocity_y)
 angle = NumericProperty(180)
 def __init__(self, **kwargs):
 super(Tank, self).__init__(**kwargs)
 self.source = 'bomb.png'
 self.anim_delay = 0.05
 def move(self, pa):
 self.pos = Vector(*self.velocity) + self.pos
 if (self.y < 0-self.size[0]):
 self.velocity_y *= 0
 if (self.x < 0):
 self.velocity_x *= 0
 if (self.right > pa.width):
 self.velocity_x = 0

class AccelerometerGun(Widget):
 tank = ObjectProperty(None)
 angle = NumericProperty(180)
 pr = NumericProperty(0.0)
 flames = 
 def start(self):
 self.tank.center = (self.width/2, 70)
 self.x_label.center = self.center
 self.tank.velocity = 0, 0
 accelerometer.enable()
 def update(self, dt):
 #self.tank.move(self)
 if self.tank.activated:
 val = accelerometer.acceleration[:3]
 if not val == (None, None, None):
 x, y, z = val[0], val[1], val[2]
 self.x_label.text = " ".join(["X", ": " + str(x)])
 self.change(x, y)
 if len(self.flames) != 0:
 for tank in self.flames:
 if tank.active:
 tank.move(self)

 def change(self, vx, vy):
 max = 2.99
 min = -2.9
 range = max - min
 correctedStartValue = vx - min
 percentage = (correctedStartValue * 180) / range
 if percentage > 180:
 percentage = 180
 if percentage < 0:
 percentage = 0
 if vx == 0.0:
 percentage = 90
 self.tank.angle = percentage
 self.addFlame()
 self.x_label.text = " ".join(["X: ", str(int(vx)), "%: ", str(percentage), "Fps: ", str(int(Clock.get_fps()))]) 
 self.tank.velocity_y = 0
 self.tank.velocity_x = 0
 #self.tank.move(self)
 def removeThis(self, bl):
 self.flames.remove(bl)
 self.remove_widget(bl)
 bl = None
 def startFlame(self, *args):
 for tank in self.flames:
 if not tank.active:
 tank.active = True
 def addFlame(self, *args):
 self.fl = Flame()
 self.add_widget(self.fl)
 self.fl.center = self.tank.center
 self.flames.append(self.fl)
 self.fl.velocity = 0, 0
 if len(self.flames) != 0:
 self.startFlame()
 def on_touch_down(self, touch):
 self.tank.activated = True

class AccelerometerApp(App):
 def build(self):
 game = AccelerometerGun()
 game.start()
 Clock.schedule_interval(game.update, 1.0 / 60.0)
 return game

if __name__ == '__main__':
 AccelerometerApp().run()

Note: i want to move the bullet by using Vector not Animation

I tried solving the question myself.

def velX(self, vex):
 for tank in self.flames:
 if tank.active:
 tank.velocity_x = -(vex*2.5) #+= -vel

and call it like this

def change(self, vx, vy):
 max = 2.99
 min = -2.9
 range = max - min
 correctedStartValue = vx - min
 percentage = (correctedStartValue * 180) / range
 if percentage > 180:
 percentage = 180
 if percentage < 0:
 percentage = 0
 if vx == 0.0:
 percentage = 90
 self.tank.angle = percentage
 self.addFlame()
 self.x_label.text = " ".join(["X: ", str(int(vx)), "%: ", str(percentage), "Fps: ", str(int(Clock.get_fps()))]) 
 self.tank.velocity_y = 0 #(vy*-1)*3.5
 self.tank.velocity_x = 0 #(vx*-1)*3.5
 #self.tank.move(self)
 self.velX(vx)