Pure Python gestures

[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.

[Drizzel]

I‘m trying to double tap on a TableViewCell without actually selecting it, but it should still be selectable on a single tap. How would I go about doing this?

Let’s assume I have this code:

import ui
import gestures

def double_tap(data):
	print('double tapped row', data.view.row)
def tap(data):
	print('tapped', data.view.row)
def long_press(data):
	print('long pressed', data.view.row)

def tableview_cell_for_row(tableview, section, row):
	data = tableview.data_source.items[row]
	cell = ui.TableViewCell('subtitle')
	cell.text_label.text = data
	cell.row = row
	gestures.doubletap(cell, double_tap)
	#gestures.tap(cell, tap, number_of_touches_required = 1)
	#gestures.long_press(cell, long_press, minimum_press_duration = .2)
	
	return cell
	
class Delegate():
	def tableview_did_select(self, tableview, section, row):
		print('selected row', row)

tv = ui.TableView()
tv.delegate = Delegate()
tv.data_source = ui.ListDataSource([str(x) for x in range(5)])
tv.data_source.delete_enabled = False
tv.data_source.tableview_cell_for_row = tableview_cell_for_row
tv.frame = (tv.frame[0], tv.frame[1], 400, 400)

tv.present(style = 'sheet')

[stephen]

@Drizzel said:

I‘m trying to double tap on a TableViewCell without actually selecting it, but it should still be selectable on a single tap. How would I go about doing this?

Let’s assume I have this code:

import ui
import gestures

def double_tap(data):
	print('double tapped row', data.view.row)
def tap(data):
	print('tapped', data.view.row)
def long_press(data):
	print('long pressed', data.view.row)

def tableview_cell_for_row(tableview, section, row):
	data = tableview.data_source.items[row]
	cell = ui.TableViewCell('subtitle')
	cell.text_label.text = data
	cell.row = row
	gestures.doubletap(cell, double_tap)
	#gestures.tap(cell, tap, number_of_touches_required = 1)
	#gestures.long_press(cell, long_press, minimum_press_duration = .2)
	
	return cell
	
class Delegate():
	def tableview_did_select(self, tableview, section, row):
		print('selected row', row)

tv = ui.TableView()
tv.delegate = Delegate()
tv.data_source = ui.ListDataSource([str(x) for x in range(5)])
tv.data_source.delete_enabled = False
tv.data_source.tableview_cell_for_row = tableview_cell_for_row
tv.frame = (tv.frame[0], tv.frame[1], 400, 400)

tv.present(style = 'sheet')

i believe you might wand def tableview_cell_for_row(tableview, section, row): as a method of class Delegate instead of a global function.

[stephen]

@Drizzel
im sure there is a much simpler way but...

why not have a state checker give x time to look for a second tap before executing functionality for a single tap? possibly a decorator?

[mikael]

@Drizzel, below works to separate the two gestures, but we lose the visual feedback for the tap selection, you would need to implement that yourself.

Better would be to find the built-in tap and give our doubletap preference over it, but I could not (yet...?) find it on the tableview, cell, content view, or the label.

import ui
import gestures

def double_tap(data):
    print('double tapped row', data.view.row)
    
def tap(data):
    print('tapped', data.view.row)
    
def tableview_cell_for_row(tableview, section, row):
    data = tableview.data_source.items[row]
    cell = ui.TableViewCell('subtitle')
    cell.selectable = False
    cell.text_label.text = data
    cell.row = row
    doubler = gestures.doubletap(cell, double_tap)
    tapper = gestures.tap(cell, tap)
    doubler.before(tapper)
    return cell
    
class Delegate():
    def tableview_did_select(self, tableview, section, row):
        print('selected row', row)

tv = ui.TableView(allows_selection=False)
tv.delegate = Delegate()
tv.data_source = ui.ListDataSource([str(x) for x in range(5)])
tv.data_source.delete_enabled = False
tv.data_source.tableview_cell_for_row = tableview_cell_for_row

tv.present('fullscreen')

[Drizzel]

@mikael thanks, that works. I just change the cell‘s background color to lightgrey for visual feedback

[Drizzel]

@stephen True, I corrected it :) The code was a bit rushed 🤷‍♂️

[stephen]

awesome 😎🤓😊

[mikael]

@Drizzel, here’s a version that supports both the doubletap and regular row selection.

import ui
import gestures

def double_tap(data):
    print('double tapped row', data.view.row)
    
def tableview_cell_for_row(tableview, section, row):
    data = tableview.data_source.items[row]
    cell = ui.TableViewCell('subtitle')
    cell.text_label.text = data
    cell.row = row
    doubler = gestures.doubletap(cell, double_tap)
    doubler.recognizer.delaysTouchesBegan = True
    return cell
    
class Delegate():
    def tableview_did_select(self, tableview, section, row):
        print('selected row', row)

tv = ui.TableView()
tv.delegate = Delegate()
tv.data_source = ui.ListDataSource([str(x) for x in range(5)])
tv.data_source.delete_enabled = False
tv.data_source.tableview_cell_for_row = tableview_cell_for_row

tv.present('fullscreen')

[Anxietier]

hi, i found another bug, after i use 5 fingers to switch app and get back, multi-touch would be not working

[cvp]

@mikael Do you think it would be possible to use you gestures module on an objectiveC object?

I want to add gestures on a SceneView object, but functions like tap require their view parameter as an object having objc_instance property (see UIGestureRecognizerDelegate init).

[cvp]

@mikael I solved it with

	def scene_view_tap(self,sender):
		location = self.recognizer.locationInView_(self.scene_view)
		node = self.scene_view.hitTest_options_(location,None)
		print(node)

.
.
.
		self.gesture_recognizer_target = ui.Button()
		self.gesture_recognizer_target.action = self.scene_view_tap
		UITapGestureRecognizer = ObjCClass('UITapGestureRecognizer')
		self.recognizer = UITapGestureRecognizer.alloc().initWithTarget_action_(self.gesture_recognizer_target, sel('invokeAction:')).autorelease()
		scene_view.addGestureRecognizer_(self.recognizer)
		self.scene_view = scene_view