Python random sketcher

randomSketcher.pyde

z1 = 750
z2 = 500
ai = [z1,z2]
ai2 = [z1,z2]
a = [10,10,10]
a2 = [10,10,10]
    

   
def setup():

    size(1000,1000) 
    background(0)
    stroke(a[0],a[1],a[2])
                           
    
def randomSketch1():
    global ai
    global a 

    
    x = int(random(-2,2))*16         # randomly selects a new direction for the walker to move to
    y = int(random(-2,2))*16
    x1 = ai[len(ai)-2]+x
    y1 = ai[len(ai)-1]+y 
    
    if x1 < 0 or x1 > width or x1 < 0 or x1 > height:   # checks if the walker hits an edge 
        a[int(random(-1,3))] += 30   # changes the color
    
        ai = [z1,z1]
        x1 = z1
        y1 = z1
    
    else: 
     
    
        if x1 < 0:
            x1 = 0
        if x1 > width:
            x1 = width 
               
    
       
        if y1 < 0:
            y1 = 0
        if y1 > height:
            y1 = height
            
    stroke(a[0],a[1],a[2])        
    line(ai[len(ai)-2],ai[len(ai)-1],x1,y1)      # draws the line
    ai.append(x1)
    ai.append(y1)


def randomSketch2():
    global ai2
    global a2 
    
    x = int(random(-2,2))*16
    y = int(random(-2,2))*16
    x1 = ai2[len(ai2)-2]+x
    y1 = ai2[len(ai2)-1]+y 
    
    if x1 < 0 or x1 > width or x1 < 0 or x1 > height:
        a2[int(random(-1,3))] += 30
    
        ai2 = [z2,z2]
        x1 = z2
        y1 = z2
    
    else: 
     
    
        if x1 < 0:
            x1 = 0
        if x1 > width:
            x1 = width 
               
    
       
        if y1 < 0:
            y1 = 0
        if y1 > height:
            y1 = height
            
    stroke(a2[0],a2[1],a2[2])        
    line(ai2[len(ai2)-2],ai2[len(ai2)-1],x1,y1)      
    ai2.append(x1)
    ai2.append(y1)    
    
        
def draw():
    
    if a[0] >= 250 or a[1] > 250 or a[2] > 250:         # resets the color to black if it hits white
        a[0] = 0 
        a[1] = 0
        a[2] = 0
        
    if a2[0] >= 250 or a2[1] > 250 or a2[2] > 250:
        a2[0] = 0 
        a2[1] = 0
        a2[2] = 0
     
    randomSketch1()
    randomSketch2()
    print(a[0],a[1],a[2]," ",a2[0],a2[1],a2[2])