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

cvp

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.

JonB

Post your button handling code again... You used to have checks that the new position was in the screen.

You actually don't need the if statements --
You could say player.position.x%=self.width, which will always cause it to wrap around.

BurntRice

Here you go:

def handle_button_presses(self):
        rotationAdd = math.pi/180
        self.Player.location = self.Player.position
        for touch in self.touches.values():
            if touch.location in self.LeftCrtl.bbox:
                actions = [A.rotate_by(math.pi/180)]
                self.Player.rotation = self.Player.rotation + rotationAdd
                self.Player.run_action(A.sequence(actions))
                
            if touch.location in self.RightCrtl.bbox:
                actions = [A.rotate_by(math.pi/-180)]
                self.Player.rotation = self.Player.rotation - rotationAdd
                self.Player.run_action(A.sequence(actions))
                

            if touch.location in self.UpCrtl.bbox:
                direction = Vector2(-math.sin(self.Player.rotation), math.cos(self.Player.rotation))
                self.Player.position += direction*3
                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

I did change the movement code a little.

ccc

@BurntRice said:

            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

@JonB said:

You actually don't need the if statements

            self.Player.position.x %= width
            self.Player.position.y %= height

JonB

Is width an height actually defined someplace?

What isn't working in your code? Is your player rotating and moving as expected? Is only the wrapping broken?

BurntRice

Only the wrapping.

BurntRice

width, height = ui.get_screen_size()
I think this is right. I did a seperate script where I print it out inside the console, and it worked.

BurntRice

I tried placing it self.update, but then it wouldn’t work.

ccc

Can we please get the code full listing? Please use the </> icon above the post edit box to paste your code so it is formatted for this forum.
```
Insert Code Here
```

BurntRice

from scene import *
import math
import random
import sound
import ui
A = Action()
width, height = ui.get_screen_size()
#Setting up meteorites


#Setting up background colour for the entire scene
class Game(Scene):

    def setup(self):
        self.bg = SpriteNode('spc:BackgroundBlack')
        self.lasers = []
        self.items = []
        self.LaserTime = 0
        self.frame_counter = 0
        self.meteor = []

        #Creating the player
        self.Player = SpriteNode('iow:arrow_up_b_32')
        self.Player.color = (1.0, 1.0, 1.0)
        self.Player.anchor_point = (0.5, 0.5)
        self.Player.x_scale = 2/1.0
        self.Player.y_scale = 3/1.0
        self.Player.position = (512, 400)
        self.Player.rotation = 0.0
        self.add_child(self.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.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)

        #The score label
        self.score_label = LabelNode(text='Score: 0')
        self.score_label.anchor_point = (0, 0)
        self.score_label.position = (10, 790)
        self.score_label.font = ('Joystix', 30)
        self.add_child(self.score_label)

    #Movement code.
    def update(self):
        self.handle_button_presses()
        self.move_lasers()
        self.update_lasers()
        self.spawn_meteor()
        width, height = ui.get_screen_size()
        self.LaserTime = self.LaserTime + 1
    
    def handle_button_presses(self):
        rotationAdd = math.pi/180
        self.Player.location = self.Player.position
        for touch in self.touches.values():
            if touch.location in self.LeftCrtl.bbox:
                actions = [A.rotate_by(math.pi/180)]
                self.Player.rotation = self.Player.rotation + rotationAdd
                self.Player.run_action(A.sequence(actions))
                
            if touch.location in self.RightCrtl.bbox:
                actions = [A.rotate_by(math.pi/-180)]
                self.Player.rotation = self.Player.rotation - rotationAdd
                self.Player.run_action(A.sequence(actions))

            if touch.location in self.UpCrtl.bbox:
                direction = Vector2(-math.sin(self.Player.rotation), math.cos(self.Player.rotation))
                self.Player.position += direction*3 
                self.Player.position.x %= width
                self.Player.position.y %= height
        
    def move_lasers(self):
        for touch in self.touches.values():
            if touch.location in self.laserButton.bbox and self.LaserTime >= 15:
                #reset the time
                self.LaserTime = 0
                new_laser = SpriteNode('shp:Circle')
                new_laser.x_scale = 0.3/1.0
                new_laser.y_scale = 0.3/1.0
                new_laser.position = self.Player.position
                new_laser.rotation = self.Player.rotation
                self.add_child(new_laser)
                self.lasers.append(new_laser)
                sound.play_effect('arcade:Laser_6')
                
    def update_lasers(self):
        for l in self.lasers:
            l.direction = Vector2(-math.sin(l.rotation), math.cos(l.rotation))*10
            l.position += l.direction
            if l.position.x < 0:
                l.remove_from_parent()
                self.lasers.remove(l)
            if l.position.x > 1112:
                l.remove_from_parent()
                self.lasers.remove(l)
            if l.position.y < 0:
                l.remove_from_parent()
                self.lasers.remove(l)
            if l.position.y > 834:
                l.remove_from_parent()
                self.lasers.remove(l)
                
    def spawn_meteor(self):
        self.frame_counter = self.frame_counter + 1
        if self.frame_counter >= 60:
            self.frame_counter = 0
            new_meteor = SpriteNode('spc:MeteorGraySmall1')
            new_meteor.position = (random.randint(0, 1024), 834)
            self.add_child(new_meteor)
            self.meteor.append(new_meteor)
        
        for meteor in self.meteor:
            meteor.position = (meteor.position.x, meteor.position.y - 5)
            if meteor.position.y < - 100:
                meteor.remove_from_parent()
                self.meteor.remove(meteor)


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

ccc

So, (as is often the case...) I was wrong about how to do the wrap around when the player gets to the edge of the screen.

self.Player.position.x %= width
self.Player.position.y %= height

# must be changed to...

self.Player.position = (self.Player.position.x % self.size.w, self.Player.position.y % self.size.h)

This is because position is a scene.Point which is scene.Vector2 which behaves more like a tuple than a list.

Also, you can safely delete all lines containing self.Player.location.

cvp

@ccc said:

as is often the case

Not so True 😂

ccc

update_lasers() can be simplified...

    def update_lasers(self):
        for laser in self.lasers:
            laser.direction = Vector2(-math.sin(laser.rotation), math.cos(laser.rotation))*10
            laser.position += laser.direction
            if laser.position not in self.bounds:  # laser has gone off the screen
                laser.remove_from_parent()
                self.lasers.remove(laser)

JonB

Also, it seems to me that you don't need both an Action that sets rotation and the actual assignment to rotation.. If you want to simulate acceleration, then you need to keep track of a velocity, and pressing the arrow button changes the velocity, and then the rotation is set by adding velocity.