How to use controlP5 in second window using python mode

Processing.py
1

Hello,

I want to put a button in the second window using ‘bang’ function from controlP5 library.
I managed to do it in the main window, but it fails when I try to put in the second window. Instead of appearing in the second window, the bang button appears in the main window.

Here is my code,

add_library('controlP5') 

def setup():    
    size(300, 300)
    global sa
    global cp5
    sa = SecondApplet()
    switches = '--sketch-path=' + sketchPath(), '' 
    PApplet.runSketch(switches, sa) 
    
def draw():
    background(200)    

class SecondApplet(PApplet):
    global parent
    parent = PApplet    
   
    def settings(p):
        p.size(300, 100), p.smooth(3), p.noLoop()
 
    def setup(p):
        p.width == 100 and p.settings()

        cp5 = ControlP5(this)
        cp5.addBang('OK').plugTo(parent,'OK').setPosition(50,50)\
                         .setSize(60,30)\
                         .getCaptionLabel().align(ControlP5.CENTER, ControlP5.CENTER)        
 
    def draw(p):
        p.background(-1), p.fill(0)
        p.text("File is not found", 10, 10)

I tried to adapt from this which is written in Java. To be honest, I am still pretty new with this coding world, so, I do not know excatly how to convert this java to python.

Thanks for your time.

2

While both in Java & JS this is a keyword, in Python Mode it’s merely another global variable. :open_mouth:

Given SecondApplet is a subclass of PApplet, you need to pass its reference to ControlP5: :bulb:
cp5 = ControlP5(p).

1 Like
3

I see. I missed passing the reference to ControlP5. That’s why it appears in the main window.
Now, it works as desired. Thanks.

4

Python Mode’s global variable this is the reference for the main PApplet canvas. :art:

5

I should note that the global variable this is for the main PApplet canvas. :+1: Thanks

Now, I got another problem.
I want to execute a function when the bang is clicked.
I add .onClick(myFunction) and declare the global function of myFunction. But, it seems nothing happens. I do the same for the controller in the main PApplet canvas, and it works well. So, I don’t get why it cannot work in the subclass.

I write my code as below.

add_library('controlP5') 

def setup():    
    size(300, 300)
    global sa
    global cp5
    sa = SecondApplet()
    switches = '--sketch-path=' + sketchPath(), '' 
    PApplet.runSketch(switches, sa) 
    
def draw():
    background(200)    

class SecondApplet(PApplet):
    global parent
    parent = PApplet    
   
    def settings(p):
        p.size(300, 100), p.smooth(3), p.noLoop()
 
    def setup(p):
        p.width == 100 and p.settings()

        cp5 = ControlP5(p)
        cp5.addBang('OK').plugTo(parent,'OK').setPosition(50,50)\
                         .setSize(60,30)\
                         .onClick(myFunction)\
                         .getCaptionLabel().align(ControlP5.CENTER, ControlP5.CENTER)        
 
    def draw(p):
        p.background(-1), p.fill(0)
        p.text("File is not found", 10, 10)

def myFunction(theValue):    
    print('It is OK!')

I wonder if there is something missing that I have to declare or define.

6

After creating a more simplified example: :sweat_smile:

# https://Discourse.Processing.org/t/
# how-to-using-controlp5-in-second-window-using-python-mode/13253/6

# GoToLoop (2019-Aug-19)

add_library('controlP5')

def settings():
    size(150, 150)
    Other()


def setup():
    ControlP5(this).addBang('Main').onClick(bangCallback)


def draw():
    background(0)


def bangCallback(v):
    print v.controller


class Other(PApplet):
    SW_PATH = '--sketch-path='
    MAGENTA = 0xFFff00ff

    def __init__(p):
        switches = Other.SW_PATH + sketchPath(), ''
        PApplet.runSketch(switches, p)


    def settings(p):
        p.size(150, 150)


    def setup(p):
        ControlP5(p).addBang('Other').onClick(bangCallback)


    def draw(p):
        p.background(Other.MAGENTA)

I’ve just realized the “bug” is due to calling noLoop() within SecondApplet::settings(): :bug:
p.size(300, 100), p.smooth(3), p.noLoop()

2 Likes
7

Thanks for mentioning this point. This really solves the problem.
:blush: :blush:

The example that you provided is also helped to understand the difference for using the controlP5 library in the main canvas and in the subclass. :star_struck:

2 Likes