Pure Python gestures

Anxietier

@mikael
well, im not good at math, i tried use touch_began\move\ended, and surely i can make simple function, but as it became complex, my brain be in chaos, XD

mikael

@Anxietier, I meant choosing between gestures.py (wrapper around iOS native gestures) and pygestures.py (pure Python gestures built on top of the ui.View.touch_x method ”primitives”.

Your answer leads me to guess you might not have been aware of the first option.

Anxietier

@mikael oh, i did try gesture.py, got some problems, and you suggested me subclass ZoomPanView instead for my need, then i did and i find it's interesting, so ~~ :))

@mikael said:

@Anxietier, can you subclass ZoomPanView instead?

If you run pygestures.py and swipe from the right, you get the demo picture that you can pan and zoom, and that seems to work ok.

The code for it is at the end of the file.

mikael

@Anxietier, oh, and I thought you were already using the python version, given the title of this discussion thread... 😄

stephen

@Anxietier

do you still need help with drag/friction algorithm ?

Anxietier

@stephen
thank you, maybe not, i did solve this problem (probably not yet)
thanks for your help :)

Anxietier

@mikael
haha, I was trying to make a zoom demo, but the effect is not good, so I googled key words "pythonista 2 finger zoom", then luckily found this XD

stephen

@Anxietier

Awesome!

ok well il still working on it because parts of the process are in my todo fo mainproject. ill post finished codebwith coments here when finished

Anxietier

@stephen
good luck ! (っ＾▿＾)۶🍸🌟🍺٩(˘◡˘ )

stephen

@Anxietier
thanks, i noticed you like those ٩(•̮̮̃•̃)۶ faces. idk if you type them everytime but i "buffed" the keyboard example script and gave it more functionality here you will be able to select them from a list that you can add to yourself heres a couple thats included.

٩(•̮̮̃•̃)۶ ٩(-̮̮̃-̃)۶ ٩(̃•̃•̃)۶ ٩(͡๏̯͡๏)۶ ٩(-̮̮̃•̃)۶ ε(̮̮̃•̮̮̃̃•̃)з (๏̯͡๏) |=_=|

Anxietier

@stephen
haha, I would try it

stephen

@mikael i usually do great at dealing with numbers... after a couple days of this i seem to have made a circle back to where i started... it might be that i dont understand Sigma or i may be using the wrong function all together... i even tried generating a logarithmic table then iterating the values to get drag to stop movment lol. any chance you @cvp @JonB or @ccc know a non built-in way to do this? here is where my testing code as it was when i stopped to post this... sorry the codes messy..


import numpy as np
import math
from scene import *
w, h=get_screen_size()

def Distance(pos1, pos2):
	x1, y1=pos1
	x2, y2=pos2
	dx, dy=x1-x2, y1-y2
	return math.sqrt(dx*dx + dy*dy)

def Force(pos1, pos2, k):
	x1, y1=pos1
	x2, y2=pos2
	return Distance(pos1, pos2)*k#/1*(1+np.exp(1))**k

def Direction(pos1, pos2):
	x1, y1=pos1
	x2, y2=pos2
	dx=(x1-x2)/Distance(pos1,pos2)
	dy=(y1-y2)/Distance(pos1,pos2)
	return Point(dx, dy)
	
class main (Scene):
	def setup(self):
		self.isDragging = False
		self.drag_T=0
		self.i=0

		self.touch_loc=(0, 0)
		self.ticks=0
		self.tick_rate=0.01
		self.origin_pos=Point(w/2, 64)
		
		self.subject=SpriteNode(
			texture=None, color=(0.0, 1.0, 0.0), size=Size(64, 64),
			position=self.origin_pos, anchor_point=(0.5, 0.5), parent=self)
		self.sub_data=LabelNode(
			text=f'(◕_◕)', font=('Menlo', 22), anchor_point=(0.5, 0.5),
			color=(0.0, 0.0, 0.0, 1.0), parent=self.subject)
		self.data=LabelNode(
			text="", font=('Menlo', 14), anchor_point=(0.0, 0.0), color=(1.0, 1.0, 1.0),
			position=Point(150,512), size=Size(256, 512), parent=self)
								
	
	def update(self):
		w, h=get_screen_size()
		self.i+=self.dt
		self.ticks+=1
		self.drag_T= (self.drag_T+1) if self.isDragging else 0
		d_o=Distance(self.subject.position, self.origin_pos)
		d_s=Distance(self.subject.position, self.touch_loc)
		d_t=Distance(self.origin_pos, self.touch_loc)
		max=Distance((w/2, h/3), self.subject.position)
		target_dir=Direction(self.touch_loc, self.subject.position)
		f=Force(self.origin_pos, self.touch_loc, self.drag_T)
		damp=(1/(1+np.exp(-max)))
		
		
		if self.isDragging:
			w, h=get_screen_size()
			x, y=self.subject.position
			xx, yy=self.touch_loc
			tx, ty=target_dir
			if max > 1:
				self.subject.position=(x+tx, y+ty+max)
			
		self.DataUpdate(d_t, d_s, d_o, max, f, target_dir)
			
		self.i=0
	def DataUpdate(self, d_t_o, d_s_t, d_s_o, max, f, t_dir):
		self.data.text= (f'Ticks: {self.ticks}\n'+
						f'Dist from Max {max}\n'+
						f'Force/Friction: {f}\n'+
						f'Drag Time: {self.drag_T}\n'+
						f'isDragging: {self.isDragging}\n'+
						f'Target Direction: {t_dir}\n'+
						f'Subject position: {self.subject.position}\n'+
						f'Touch location: {self.touch_loc}\n'+
						f'Origin: {self.origin_pos}\n\n'+
						f'Distance - Touch→Origin: {d_t_o}\n'+
						f'Distance - Subject→Origin: {d_s_o}\n'+
						f'Distance - subject→Touch: {d_s_t}\n')
		
	def touch_began(self, touch):
		self.isDragging = True
		self.touch_loc=touch.location
	
	def touch_moved(self, touch):
		tx, ty=touch.location
		sx, sy=self.subject.position
		self.touch_loc=touch.location
		
	def touch_ended(self, touch):
		self.isDragging = False
		#self.touch_loc=(0, 0)
		#self.direction=(0, 0)
		self.drag_T=0
		self.subject.position=self.origin_pos
run(main())

cvp

@stephen I'm sincerely sorry but, perhaps/obviously due to my poor English, I don't understand what you want to do with this script.

cvp

@stephen first remark, setting tx,ty,sx,sy is useless, isn't it?

    def touch_moved(self, touch):
        tx, ty=touch.location
        sx, sy=self.subject.position
        self.touch_loc=touch.location

stephen

@cvp yes very much so in is what i posted. when i test i use alot of exlusive calls to insure control to eliminate inclusive bug or errors then when i achieve outcome expected i remove exclusive properties one at a time . just a metegation process i developed over the years. i should have mentioned this im sorry for the confusion. lol ☺️ the one your speaking of used to be connected to instance variables that i already removed lol kinda what i meant when i said sorry for the messy code lol

also my goal was to creat a drag dampener. for example dragging an object from the bottom of the screen thats constrained to half screen size for travel. nd object speed slows as it aproaches max distance. similar to a vehicle comng to a stop at a trafic light..

cvp

@stephen ok, understood. I'm really not a specialist of games or scene but I wonder if there are no functions for the physical aspect of the movements.
Hoping other guys will help you. And sorry, I shouldn't have doubted 🙄

stephen

@cvp

there are animations and i beleive interpolation functions i could use and i, sure they work amazingly 🙃 but i dont learn much using premade. i like to try and understand whats going on even behind the scenes. then once i understand then ill use builtin "shortcuts". i guess i like to make things as dificult as possible lol at least thats what my ex-wife would say 😅😂😅

thank you for checking it out tho its much appritiated. and just fyi the only diference from games and other types of programs is graphical programing mainly. and resource managment. i use scene module mainly for touch input controls and i like the way it implements the eventloop. i could just use my own loop and objc for touch input. but i am slowly replacing parts of scene with objc code cuz it has been improving performance.

cvp

@stephen I can understand that. Due to my experience of (very) old guy using (very) old tools, I like to do all myself and I never have used Scene. I also prefer do animations my self in update method.
Good luck and have fun...

mikael

@stephen, the original request for ”pull to refresh” was covered earlier with one line of ”math”. What are you trying to achieve here? Spring force? Coulomb effect?

If you like scene and like to play with forces, you could look at SpriteKit - but that would not be ”rolling your own”.

stephen

@mikael its ok but yes i was trying to acheive a spring like constraint. but ill go ahead a put it to the side for now. thanks for the reply.