Random x and y coordinates

resserone13

I’m trying to generate random x and y coordinates for a spritenode with scene.


from scene import *
import sound
import random
import math
A = Action

#screen_size = (414.00, 896.00)

class MyScene (Scene):
	def setup(self):
		
		self.bubble = SpriteNode('emj:Blue_Circle')
		
		self.x = random.randrange(410)
		self.y = random.randrange(890)
		
		self.bubble.position = (self.x, self.y)
		self.background_color = 'white'
		

		self.add_child(self.bubble)

	
	def next_location():	
		for x in range(9999):
			self.x = random.randrange(410)
			self.y = random.randrange(890)
			yield x, y
	
	#self.new_position =	self.next_location()
			
	def did_change_size(self):
		pass
	
	def update(self):
		pass

	
	def touch_began(self, touch):
		if touch.location in self.bubble.frame:
			self.bubble.remove_from_parent()
			self.x = random.randrange(410)
			self.y = random.randrange(890)
	


	
	def touch_moved(self, touch):
		pass
	
	def touch_ended(self, touch):
		self.add_child(self.bubble)




		


if __name__ == '__main__':
	run(MyScene(), show_fps=False)

ccc

Untested...

def random_location(self) -> ui.scene.Point:
    return ui.scene.Point(*(random.randrange(x) for x in self.size))

resserone13

@ccc I’ll see how it works. Thanks.

mikael

@resserone13, note that in your code:

self.x, self.y move the scene around, not your SpriteNode
next_position is missing self
if all you are returning is random numbers, function like @ccc’s is sufficient, the generator with yield seems to add no value

resserone13

@mikael how would I be able to change the location of the sprite. I was trying to have a bubble pop up on the screen and once it’s tapped it pops up on another random place of the screen and can be tapped again and then pop up at another random place

Also. What does the —> and * do?


def random_location(self) -> ui.scene.Point:
    return ui.scene.Point(*(random.randrange(x) for x in self.size))

It was saying ui has no attribute scene when I tried it. I’m using 3.6

ccc

Please change ui.scene.Point to just Point (because the line from scene import * pollutes the global namespace with all members of the scene package which runs contrary to the advice of PEP8).

The -> is using Python type hints to declare what data type this function returns. https://docs.python.org/3/library/typing.html

The * says treat one object as several objects in an iterator. This is usually referred to as *args and **kwargs.

JonB

@resserone13 just move self.bubble, not self, inside touch_began. And don't remove the bubble.

Or if there is some reason to actually spawn a new one, you would create it there, and assign it to self.bubble

resserone13

@JonB we did it! Thanks. I was unaware that I wasn’t moving this sprite node. Now the bubble moves around and re spawns in random locations. I’m trying to create a game where bubbles randomly pop up on the screen and you have to tap them before the screen becomes completely full.


	def touch_began(self, touch):
		if touch.location in self.bubble.frame:
			self.bubble.remove_from_parent()
			self.bubble.position = random.randrange(410), random.randrange(890)
			self.add_child(self.bubble)

JonB

In that case you will want a list of bubbles, and will need to cycle through the list to see which one was tapped.

resserone13

@JonB I added a counter to the center of the screen to show how many tap have been made.

I have seen people use List To keep track of lasers in a game where a spaceship shoots lasers. I’m not sure how it works.


from scene import *
import sound
import random
import math
A = Action

#screen_size = (414.00, 896.00)

class MyScene (Scene):
	def setup(self):
		
		#backgound color
		self.background_color = 'white'
		
		#tap count
		self.tap_count = 0
		
		#bubble sprite
		self.bubble = SpriteNode('emj:Blue_Circle')
		
		#bubble position
		self.bubble.position = random.randrange(440), random.randrange(880)

		#adds bubble to screen
		self.add_child(self.bubble)
		
		#amout of taps
		self.tap_amount_lable = LabelNode(f'{self.tap_count}', font = ('MarkerFelt-Wide', 150), position = self.size/2, color = 'black')
		
		#fades tap amount into background
		self.tap_amount_lable.alpha = .5
		
		#adds tap amount to screen
		self.add_child(self.tap_amount_lable)
			
	def did_change_size(self):
		pass
	
	def update(self):
		self.tap_amount_lable.text = f'{self.tap_count}'

	
	def touch_began(self, touch):
		if touch.location in self.bubble.frame:
			self.bubble.remove_from_parent()
			self.bubble.position = random.randrange(410), random.randrange(890)
			self.add_child(self.bubble)
			
			#keep track of taps
			self.tap_count += 1
	


	
	def touch_moved(self, touch):
		pass
	
	def touch_ended(self, touch):
		pass





		


if __name__ == '__main__':
	run(MyScene(), show_fps=False)

resserone13

@ccc ended up using.


self.bubble.position = random.randrange(410), random.randrange(890)

ccc

So what happens when you move your scene to a different device? iPad, iPad Mini, iPhone small screen, iPhone XL screen? Also, when you rotate the screen.

mikael

@resserone13, removing and then adding the bubble to the parent is unnecessary and makes no visual difference. Just change the position.

If you want a small delay between the bubble vanishing and popping up again, use Actions.

resserone13

@ccc I’ve tried a few things but it keeps saying range expected a sequence.

Maybe this...


			self.bubble.position = ((*(random.randrange(x) for x in self.size)),
			(*(random.randrange(x) for x in self.size)))

resserone13

@mikael I had trouble with action. I have a card game I’m working on and I can’t really figure out action or sequence. I was trying to have the cards shuffle around. With . Move_to(). I can get to to move once but no more and I can’t figure out sequence

mikael

@resserone13, a little repeated code is not bad, if it makes things more understandable:

Try:

self.bubble.position = random.randrange(self.size.w), random.randrange(self.size.h)

resserone13

@mikael thanks. That works and is simple. Can you show me an example of how to use actions and how to use sequence? Maybe make the bubble move twice each time it’s touched?

mikael

@resserone13, here’s an example, quickly adapted from the docs. To make progress on this, be sure to read at least all the intro bits of the scene module, and keep hitting the Help on the individual methods.

from random import randrange

from scene import *


class MyScene (Scene):
    
    bubble_radius = 40
    bubble_diameter = bubble_radius * 2
    
    def setup(self):
        self.background_color = 'midnightblue'
        self.bubble = SpriteNode('plf:HudCoin')
        self.bubble.position = self.size / 2
        self.bubble.size = (self.bubble_diameter,) * 2
        self.add_child(self.bubble)

    def touch_began(self, touch):
        # Hit detect
        if abs(self.bubble.position - touch.location) <= self.bubble_radius:
            new_position = randrange(self.size.w), randrange(self.size.h)
            self.bubble.run_action(
                Action.sequence(
                    Action.fade_to(0, 0.3),
                    Action.move_to(*new_position),
                    Action.wait(0.1),
                    Action.fade_to(1, 0.3),
                )
            )


run(MyScene())

enceladus

Look at the following scene action examples in
https://github.com/encela95dus/ios_pythonista_examples

From readme
scene_action1,2,3.py
textanimation.py
textanimation_wayy.py

resserone13

@enceladus thanks for the info. I have looked through some of this. Mainly the card game. A lot of good stuff. My issue Sometimes is understanding what I’m reading. I believe it’s good to read code and I try to read as much as I can and watch videos and figure out everything I can buy myself and then after that I’ll post here.