Help me find a way to make the lasers fire in a certain direction.

[BurntRice]

I need the type of code so that depending on which direction button was pressed last, the lasers fires in that direction. My code so far only shoots in a positive x axis. I need it to shoot in negative x axis, and positive and negative y axis as well.
Here is my code so far:

from scene import *
import turtle 
import ui 
import math
import random
A = Action()
#Setting up background colour for the entire scene
class Game(Scene):
    
    def setup(self):
        self.bg = SpriteNode('spc:BackgroundBlack')
        self.lasers = []
        
        #Creating the player
        self.Player = SpriteNode('shp:RoundRect')
        self.Player.color = ("cyan")
        self.Player.anchor_point = (0.5, 0)
        self.Player.position = (512, 400)
        self.add_child(self.Player)
        
        #Controlling the player
        self.UpCrtl = SpriteNode('iow:arrow_up_b_32')
        self.UpCrtl.x_scale = 3.5/1.0
        self.UpCrtl.y_scale = 3.5/1.0
        self.UpCrtl.alpha = 0.5
        self.UpCrtl.position = (175, 295)
        self.add_child(self.UpCrtl)
        
        self.DownCrtl = SpriteNode('iow:arrow_down_b_32')
        self.DownCrtl.x_scale = 3.5/1.0
        self.DownCrtl.y_scale = 3.5/1.0
        self.DownCrtl.alpha = 0.5
        self.DownCrtl.position = (175, 130)
        self.add_child(self.DownCrtl)
        
        self.RightCrtl = SpriteNode('iow:arrow_right_b_32')
        self.RightCrtl.x_scale = 3.5/1.0
        self.RightCrtl.y_scale = 3.5/1.0
        self.RightCrtl.alpha = 0.5
        self.RightCrtl.position = (250, 212.5)
        self.add_child(self.RightCrtl)
        
        self.LeftCrtl = SpriteNode('iow:arrow_left_b_32')
        self.LeftCrtl.x_scale = 3.5/1.0
        self.LeftCrtl.y_scale = 3.5/1.0
        self.LeftCrtl.alpha = 0.5
        self.LeftCrtl.position = (100, 212.5)
        self.add_child(self.LeftCrtl)
        
        #The button for shooting
        self.laserButton = SpriteNode('shp:Circle')
        self.laserButton.color = ('gray')
        self.laserButton.x_scale = 3/1
        self.laserButton.y_scale = 3/1
        self.add_child(self.laserButton)
        self.laserButton.position = (1000, 212.5)
        
    def update(self):
        for touch in self.touches.values():
            if touch.location in self.LeftCrtl.bbox:
                #left button pressed
                new_x = self.Player.position.x - 5
                if new_x >= 0 and new_x <= 1100:
                    self.Player.position = (new_x, self.Player.position.y)
                    
            if touch.location in self.RightCrtl.bbox:
                    #right button pressed
                new_x = self.Player.position.x + 5
                if new_x >= 0 and new_x <= 1100:
                    self.Player.position = (new_x, self.Player.position.y)
            
            if touch.location in self.UpCrtl.bbox:
                new_y = self.Player.position.y + 5
                if new_y >= 0 and new_y <= 800:
                    self.Player.position = (self.Player.position.x, new_y)
                
            if touch.location in self.DownCrtl.bbox:
                new_y = self.Player.position.y - 5
                if new_y >= 0 and new_y <= 800:
                    self.Player.position = (self.Player.position.x, new_y)

            if touch.location in self.laserButton.bbox:
                new_laser = SpriteNode('spc:LaserBlue6')
                new_laser.position = (self.Player.position.x, self.Player.position.y + 60)
                self.add_child(new_laser)
                self.lasers.append(new_laser)

        for l in self.lasers:
            l.position = (l.position.x, l.position.y + 7.5)
            if l.position.y > 800:
                l.remove_from_parent()
                self.lasers.remove(l)


if __name__ == '__main__':
    run(Game(), LANDSCAPE, show_fps=True)

[BurntRice]

def update(self):
self.handle_button_presses()
self.move_lasers()
if random.random() < 0.01:
self.spawn_item()

def handle_button_presses(self):
    for touch in self.touches.values():
        if touch.location in self.LeftCrtl.bbox:
            new_x = self.Player.position.x - 5
            self.Player.rotation = math.pi/2
            if new_x >= 0 and new_x <= 1100:
                self.Player.position = (new_x, self.Player.position.y)

        if touch.location in self.RightCrtl.bbox:
            new_x = self.Player.position.x + 5
            self.Player.rotation = math.pi*3/2
            if new_x >= 0 and new_x <= 1100:
                self.Player.position = (new_x, self.Player.position.y)

        if touch.location in self.UpCrtl.bbox:
            new_y = self.Player.position.y + 5
            self.Player.rotation = 0.0
            if new_y >= 0 and new_y <= 800:
                self.Player.position = (self.Player.position.x, new_y)

        if touch.location in self.DownCrtl.bbox:
            new_y = self.Player.position.y - 5
            self.Player.rotation = math.pi
            if new_y >= 0 and new_y <= 800:
                self.Player.position = (self.Player.position.x, new_y)

def move_lasers(self):
    for touch in self.touches.values():
        if touch.location in self.laserButton.bbox:
            new_laser = SpriteNode('shp:Circle')
            new_laser.x_scale = 0.25/1.0
            new_laser.y_scale = 0.25/1.0
            new_laser.position = self.Player.position
            new_laser.rotation = self.Player.rotation
            direction = Vector2(-math.sin(new_laser.rotation), math.cos(new_laser.rotation))
            self.add_child(new_laser)
            self.lasers.append(new_laser)
            for l in self.lasers:
                l.position += direction*75

[dereq]

This post is deleted!

[JonB]

for l in self.lasers:
                l.position += direction*75

That is the code that moves a laser beam, right?

In words, can you explain under what conditions this code runs?

Does that code execute EVERY time update is called, or is there some logic that controls when it will run?

Hint, look above it for any for loops or if statements.

[arsartindustry]

This post is deleted!

[BurntRice]

The code runs whenever the laser button detects that someone has touched it.

[JonB]

@BurntRice but you told me that you want lasers to MOVE even when someone is not currently touching the button.

So, you must move the MOVE code out from inside the for touch in self.touches loop.

Your code has two parts:

• Create a new laser object when person touches the button
• Move all of the existing lasers

The first part should only happen when user is touching the button.

The second part should happen always.

Erase your for l in self.lasers code. Now, write new movement code inside a new function, which you will call from update. You will need to redefine direction inside your loop -- it is not the same direction variable that is used inside your creation code. for now, hardcod direction=Vector2(0,1) just so you can get something to work. Later you will use the laser rotation to determine direction.

[BurntRice]

I’m still working on it, but I added this:

def update_lasers(self):
        for l in self.lasers:
            l.direction = Vector2(0,1)
            l.rotation = self.Player.rotation
            l.position = l.position + l.direction

I just want to check if I’m getting side tracked or not.

[JonB]

When a laser is moving, it should move based on IT's rotation,not the player rotation. You might move after the laser gets fired, but you want the laser to go straight.

So delete the line updating the rotation. The rotation was set when you spawn the laser.

This code should work, but of course the laser always goes in one direction. So next, you can redefine direction using the l.rotation, similar to the way you calculated it when you spawn the laser

[BurntRice]

I think I’ve finally done it! It works, as it shoots in the way I want it, and keeps on travelling even when I haven’t touched it, thanks.
All I have to do is add a action so I can’t spam or hold down on the button. What is the best way to add this?

[BurntRice]

Also, I would also like to know how to code screen wrapping.

[ccc]

player.location.x %= screen.width
player.location.y %= screen.height

[BurntRice]

Oh, thanks.

[BurntRice]

Wait, how do find the screen width and height? And what about location?

[cvp]

@BurntRice said:

how do find the screen width and height

ui.get_screen_size() --> width,height

[JonB]

Re spamming, one approach is, in your button handling code, to keep track of self.t, and self.lastfire_time. When current time minus last fire time is > some value, reset the last fire time to current time, and fire a laser. Otherwise, pass

BTW, in your laser loop, you will need to check if the laser is off screen (not in self.bounds), then delete the object from the scene. Otherwise your scene will eventually bog down or crash because it is moving millions of laser objects.

This could also be done in your check_collisions method where you see if your lasers hit your enemies.

[BurntRice]

@cvp And what about location?

[JonB]

position, not location.

If you want to wrap, you need to fundamentally change your button logic, since you check limits

[BurntRice]

I have added this:
width, height = ui.get_screen_size()
And then added this later:
if self.Player.position.x <= 0 or self.Player.position.x >= 1112:
self.Player.position.x %= width
if self.Player.position.y <= 0 or self.Player.position.y >= 834:
self.Player.position.y %= height
This didn’t work. I checked if I had gotten the width and height variables in a seperate script, and I did. I am now stumped.

[JonB]

What do you think your if statement does?

[BurntRice]

Whenever the Players position.x is equal to or smaller than 0 or whenever the position.x is equal to or greater than 1112, you do the remainder of the division of the screen height.