Name

noLoop()
Examples 
def setup(): 
    size(200, 200)
    noLoop()

def draw(): 
    line(10, 10, 190, 190)

x = 0.0

def setup():
    size(200, 200)

def draw():
    background(204)
    global x
    x = x + 0.1
    if x > width:
        x = 0
    line(x, 0, x, height)

def mousePressed():
    noLoop()

def mouseReleased():
    loop()

someMode = False

def setup():
    noLoop()

def draw():
    if someMode:
        pass

def mousePressed():
    global someMode
    someMode = True
    redraw()  # or loop()
Description Stops Processing from continuously executing the code within draw(). If loop() is called, the code in draw() begins to run continuously again. If using noLoop() in setup(), it should be the last line inside the block.

When noLoop() is used, it's not possible to manipulate or access the screen inside event handling functions such as mousePressed() or keyPressed(). Instead, use those functions to call redraw() or loop(), which will run draw(), which can update the screen properly. This means that when noLoop() has been called, no drawing can happen, and functions like saveFrame() or loadPixels() may not be used.

Note that if the sketch is resized, redraw() will be called to update the sketch, even after noLoop() has been specified. Otherwise, the sketch would enter an odd state until loop() was called.
Syntax
noLoop()
Related loop()
redraw()
draw()

Updated on Mon Sep 21 15:53:25 2020.

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