fromColor = color(196,4,129)
toColor = color(4, 196, 159)

size(600,600)
background(255)

i = 0
while i <= 6:
    j = 0
    while j <= 6:
        
        # Solution 1: a color gradient using a looping variable
        # fill( i*40, 0, j*40 )
        
        # Solution 2: a color gradient using lerpColor()
        # interA = lerpColor(fromColor, toColor, i*j/36.0)

        # Solution 2b: a variation on the above, using lerpColor() to
        # make a gradient fading in the other direction 
        # interA = lerpColor(fromColor, toColor, 1-i*j/36.0)
        
        fill(interA)
        rect(j*100,i*100, 100,100)
        
        j = j + 1
    i = i + 1

# trying to make a gradient using lerpColor() but
# can only make the first two rows change