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You can open the Code and modify the function: see the Help
HELP

function f(x) { y =  x; return y }
function g(x) { y = -x+3; return y }

aX = -1.5; bX = 6.5; aY = -1.5; bY = 6.5
Dx = 1/2; Dy = 1/2

Q1x=[0,5]; Q1y=[0,5]; Q2x=[0,3]; Q2y=[3,0]; Qx=[1.5]; Qy=[1.5]

AX=BX=AY=BY=""

T0=["0",0,-1.8]; T1=["2",2,-1.8]; T3=["4",4,-1.8]; T4=["6",6,-1.8]
T5=["0",-1.8,0]; T6=["2",-1.8,2]; T7=["4",-1.8,4]; T8=["6",-1.8,6]