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    This is the community forum for my apps Pythonista and Editorial.

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    Pure Python gestures

    Pythonista
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    • Anxietier
      Anxietier @stephen last edited by

      @stephen im not sure understand whats ur meaning (not good at eng..) :
      make one label, when i swipe it up\down\left\right, or drag it, or zoom it, etc.. it can do diff things
      did u mean that? if so, then yes
      btw, if u wanna swipe 4 directions with one handle, u can write like this:
      gestures.RIGHT|gestures.LEFT|gestures.UP|gestures.DOWN

      stephen 1 Reply Last reply Reply Quote 0
      • mikael
        mikael @Anxietier last edited by

        @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.

        Anxietier 1 Reply Last reply Reply Quote 1
        • stephen
          stephen @Anxietier last edited by

          @Anxietier okay i was in a bit of a rush before and didnt visualize fully.

          I have not looked at @mikael 's module yet but givin who authored it im sure ite outstsnding. that said my first post is no longer valid.. πŸ˜…πŸ˜‰



          as for your original issue i went to photos and played with the pinch/pan for a bit and i noticed that if i pinched from corners ↴

          good

          everythingbworked fine. BUT if one finger wasnt close enough to corner ↴

          bad

          the gester would act as though it had constraints.

          if i understand your problem then possibly these are similarbin effect and that should mean increasing the "touch" target rect size would help prevent this?

          Note: inused photos App givin u wanted to Mock functionality β˜ΊοΈπŸ€“

          Anxietier 1 Reply Last reply Reply Quote 0
          • Anxietier
            Anxietier @mikael last edited by

            @mikael hi, i tested zoomPanDemo, and it works fine, thanks for advice.
            btw, im trying to make an effect that when i drag down PanView, it can make me feel damping, as my finger move away, it can get back to origin pos, feel like looking website, drag down for refresh
            could you provide any idea for that? thank you

            stephen 1 Reply Last reply Reply Quote 0
            • Anxietier
              Anxietier @stephen last edited by

              @stephen thx for reply
              ive tryed mikael's zoomPanDemo, add it to my main View, and it works fine, so the issue is on mine :(
              i would subclass ZoomPanView, and try it :D

              1 Reply Last reply Reply Quote 0
              • stephen
                stephen @Anxietier last edited by

                @Anxietier no problem. i looked over the moduleand it looks like all uwould need to do is run a ui.animate transgorm back yto orignal psition.if touch doesnt store the original long enough (it should) you can also store this in a var. should be straight forward butd have to run through this module a bit beore i can give an example.

                Anxietier 1 Reply Last reply Reply Quote 0
                • Anxietier
                  Anxietier @stephen last edited by

                  @stephen
                  yeah, i made a demo, i subclass ui.view, add ui,imageview to show image, and i def a method to fix imageview_size to view_size, include view_center, when i drag down imageview and leave my finger, it can move back to origin pos,
                  but, i need an experience, i'd try to describe it:
                  '' when i drag it down shortly, imageview would move down follow my finger,
                  when my finger drag long way, like from top screen to bottom, the imagview wouldnt follow my finger, feel like dragging a strong
                  spring ''
                  i try to find a math function to let imageview and fingers' trave non-linear, but i failed, so ... u know :P

                  stephen mikael 2 Replies Last reply Reply Quote 0
                  • stephen
                    stephen @Anxietier last edited by

                    @Anxietier πŸ€“ ah math now i can help u. give me a few min to write up a friction/drag method for you

                    1 Reply Last reply Reply Quote 0
                    • mikael
                      mikael @Anxietier last edited by

                      @Anxietier, please see below for something you can adjust to your needs.

                      I recommend and use scripter, because it makes the animations easy and includes the ease functions.

                      import ui
                      import scripter
                      
                      v = ui.View(background_color='black')
                      
                      class Pulled(ui.View):
                          
                          straight_pull = 100
                          slowing_pull = 100
                          
                          def touch_began(self, t):
                              self.start_y = ui.convert_point(t.location, from_view=self).y
                              
                          def touch_moved(self, t):
                              delta_y = (
                                  ui.convert_point(t.location, from_view=self).y - 
                                  ui.convert_point(t.prev_location, from_view=self).y)
                              if self.y < self.straight_pull:
                                  self.y += delta_y
                                  return
                              if self.y < (self.straight_pull + self.slowing_pull):
                                  diff = self.y-self.straight_pull
                                  diff_fraction = diff/self.slowing_pull
                                  effective = 1 - min(1, diff_fraction) ** 2
                                  self.y += delta_y * effective
                              
                          def touch_ended(self, t):
                              scripter.y(self, 0, ease_func=scripter.ease_out)
                      
                      v.add_subview(Pulled(
                          frame=v.bounds,
                          flex='WH',
                          background_color='green'))
                      
                      v.present('fullscreen')
                      
                      Anxietier 1 Reply Last reply Reply Quote 0
                      • Anxietier
                        Anxietier @mikael last edited by

                        @mikael
                        thank you, when i ran ur code, it post me an error:
                        scripter.y(self, 0, ease_func=scripter.ease_out)
                        module 'scripter' has no attribute 'y'

                        then i check scripter.py, i only found the vector_class has a method called y(...)
                        im confused~

                        Anxietier 1 Reply Last reply Reply Quote 0
                        • Anxietier
                          Anxietier @Anxietier last edited by

                          @Anxietier @mikael
                          oh, never mind, i restarted app, now its wording fine :D

                          mikael 2 Replies Last reply Reply Quote 0
                          • mikael
                            mikael @Anxietier last edited by

                            @Anxietier, and a version with a revealed label and a refresh trigger:

                            import ui
                            import scripter
                            
                            v = ui.View(background_color='black')
                            
                            class Pulled(ui.View):
                                
                                straight_pull = 30
                                slowing_pull = 80
                                
                                def touch_began(self, t):
                                    self.start_y = ui.convert_point(t.location, from_view=self).y
                                    
                                def touch_moved(self, t):
                                    delta_y = (
                                        ui.convert_point(t.location, from_view=self).y - 
                                        ui.convert_point(t.prev_location, from_view=self).y)
                                    if self.y < self.straight_pull:
                                        self.y += delta_y
                                        return
                                    if self.y < (self.straight_pull + self.slowing_pull):
                                        diff = self.y-self.straight_pull
                                        diff_fraction = diff/self.slowing_pull
                                        try:
                                            self.reveal_func(diff_fraction)
                                        except AttributeError: pass
                                        effective = 1 - min(1, diff_fraction) ** 2
                                        self.y += delta_y * effective
                                        
                                    
                                def touch_ended(self, t):
                                    scripter.y(self, 0, ease_func=scripter.ease_out)
                                    try:
                                        self.reveal_func(0)
                                    except AttributeError: pass
                                    if self.y > self.straight_pull:
                                        self.trigger_func()
                            
                            label = ui.Label(text='Release to refresh',
                                text_color='white',
                                flex='LBR',
                                alpha=0,
                            )
                            label.size_to_fit()
                            label.center = v.bounds.center()
                            label.y = 8
                            v.add_subview(label)
                            
                            def reveal(fraction):
                                label.alpha = fraction
                                
                            def trigger():
                                scripter.hide(label)
                                print('refresh')
                            
                            v.add_subview(Pulled(
                                reveal_func=reveal,
                                trigger_func=trigger,
                                frame=v.bounds,
                                flex='WH',
                                background_color='green'))
                            
                            v.present('fullscreen')
                            
                            Anxietier 1 Reply Last reply Reply Quote 0
                            • mikael
                              mikael @Anxietier last edited by

                              @Anxietier, oh, you can throw away the touch_began method, it’s from an earlier version.

                              Anxietier 1 Reply Last reply Reply Quote 0
                              • Anxietier
                                Anxietier @mikael last edited by

                                @mikael thank you
                                and if i want to bind it with gestures, what should i do
                                i mean is there any conflict between gestures and touch
                                what i want to make is, i can use twin fingers to zoom and move picture(imageview or subclass zoompanview, later is better i guess), and when i move picture, move space and scale would be limited, as i leave my fingers, picture's edge should be forced move to superview's edge

                                1 Reply Last reply Reply Quote 0
                                • Anxietier
                                  Anxietier @mikael last edited by

                                  @mikael ah, dont bother
                                  i didnt read doc carefully(perhaps wrong word :P), now i can bind them together, thanks for ur help, ur codes are really amazing and helpful :D

                                  mikael stephen 2 Replies Last reply Reply Quote 0
                                  • mikael
                                    mikael @Anxietier last edited by

                                    @Anxietier, little optimization of the ”feel” and code simplification.

                                    import ui
                                    import scripter
                                    
                                    v = ui.View(background_color='black')
                                    
                                    class Pulled(ui.View):
                                        
                                        trigger_distance = 30
                                        pull_distance = 80
                                        
                                        def touch_moved(self, t):
                                            delta_y = (
                                                ui.convert_point(t.location, from_view=self).y - 
                                                ui.convert_point(t.prev_location, from_view=self).y)
                                            diff_fraction = self.y/self.pull_distance
                                            try:
                                                self.reveal_func(diff_fraction)
                                            except AttributeError: pass
                                            self.y += delta_y * (1 - min(0.9, diff_fraction) ** 2)
                                            self.y = max(0, self.y)
                                            
                                        def touch_ended(self, t):
                                            scripter.y(self, 0, ease_func=scripter.ease_out)
                                            try:
                                                self.reveal_func(0)
                                            except AttributeError: pass
                                            if self.y > self.trigger_distance:
                                                self.trigger_func()
                                    
                                    label = ui.Label(text='Release to refresh',
                                        text_color='white',
                                        flex='LBR',
                                        alpha=0,
                                    )
                                    label.size_to_fit()
                                    label.center = v.bounds.center()
                                    label.y = 8
                                    v.add_subview(label)
                                    
                                    def reveal(fraction):
                                        label.alpha = fraction
                                        
                                    def trigger():
                                        scripter.hide(label)
                                        print('refresh')
                                    
                                    v.add_subview(Pulled(
                                        reveal_func=reveal,
                                        trigger_func=trigger,
                                        frame=v.bounds,
                                        flex='WH',
                                        background_color='green'))
                                    
                                    v.present('fullscreen')
                                    
                                    Anxietier 1 Reply Last reply Reply Quote 1
                                    • stephen
                                      stephen @Anxietier last edited by stephen

                                      !!! Removed by poster to not confuse future readers with incorrect Code Examples.. πŸ€“πŸ˜‰

                                      Anxietier 1 Reply Last reply Reply Quote 0
                                      • Anxietier
                                        Anxietier @mikael last edited by

                                        @mikael
                                        thanks for help, i make it
                                        but there's another problem showed up:
                                        i make a main view, then i subclass zoomPanView and add to mainView , after that i add imageView as zoomPanView's subVIew, like what zoomPanDemo did, when i overwrite on_pan method and test it, data.began and data.changed can give me right value, but data.ended not, i dont know why

                                        Anxietier 1 Reply Last reply Reply Quote 0
                                        • Anxietier
                                          Anxietier @stephen last edited by

                                          @stephen thanks for help!
                                          im would try to understand ur code, im not good in math though :(
                                          btw, i tried mikael's code, and it works fine to me :P

                                          1 Reply Last reply Reply Quote 0
                                          • Anxietier
                                            Anxietier @Anxietier last edited by

                                            @Anxietier said:

                                            @mikael
                                            thanks for help, i make it
                                            but there's another problem showed up:
                                            i make a main view, then i subclass zoomPanView and add to mainView , after that i add imageView as zoomPanView's subVIew, like what zoomPanDemo did, when i overwrite on_pan method and test it, data.began and data.changed can give me right value, but data.ended not, i dont know why

                                            one more thing, i overwrote on_pinch too, and i printed data.ended, and got right value, maybe two gesture's ended flag conflict ?

                                            mikael Anxietier 2 Replies Last reply Reply Quote 0
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