size(200, 200)
def lerp(value1, value2, factor):
    # simple linear interpolation. factor from 0.0 to 1.0
    return value1+(value2-value1)* factor

def blend_color(color1, color2, blend_factor):
    red1, green1, blue1 = color1
    red2, green2, blue2 = color2
    red = red1+(red2-red1)*blend_factor
    green = green1+(green2-green1)*blend_factor
    blue = blue1+(blue2-blue1)*blend_factor
    return red, green, blue

c1 = 16
c2 = 138
ot = 100-20
c = lerp(c1, c2, 0.5)

cl1 = (1.0, 0.0, 0.0)
cl2 = (0.0, 0.0, 1.0)

cl_blend = blend_color(cl1, cl2, 0.5)
#print cl_blend

fill(cl1)
oval(ot, c1, 40, 40)
fill(cl2)
oval(ot, c2, 40, 40)
fill(cl_blend)
oval(ot, c, 40, 40)