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 Entry name:  Zhang-Suen Thinning Algorithm  Category: Graphics Publisher/Developer: Rosetta Code Year: 2021 Code: amarok Programming language: Action!
Listing 1
```PROC DrawImage(BYTE ARRAY image BYTE x,y,width,height)
BYTE i,j
BYTE POINTER ptr

Color=2
FOR j=0 TO height-1
DO
Plot(x,j+y) DrawTo(x+width-1,j+y)
OD
Color=1
ptr=image
FOR j=0 TO height-1
DO
FOR i=0 TO width-1
DO
IF ptr^ THEN
Plot(i+x,j+y)
FI
ptr==+1
OD
OD
RETURN

PROC Thinning(BYTE ARRAY image BYTE width,height)
DEFINE PTR="CARD"
DEFINE MAX="200"
PTR ARRAY change(MAX)
BYTE POINTER p1,p2,p3,p4,p5,p6,p7,p8,p9,p68,p24
INT count,i
BYTE x,y,sum,step1

step1=1
DO
count=0
p1=image p8=p1-1 p4=p1+1
p2=p1-width p6=p1+width
p9=p2-1 p3=p2+1
p7=p6-1 p5=p6+1

FOR y=0 TO height-1
DO
FOR x=0 TO width-1
DO
IF p1^=1 AND x>0 AND y>0 AND x<width-1 AND y<height-1 THEN
sum=p2^+p3^+p4^+p5^+p6^+p7^+p8^+p9^
IF sum>=2 AND sum<=6 THEN
sum=0
IF p3^>p2^ THEN sum==+1 FI
IF p4^>p3^ THEN sum==+1 FI
IF p5^>p4^ THEN sum==+1 FI
IF p6^>p5^ THEN sum==+1 FI
IF p7^>p6^ THEN sum==+1 FI
IF p8^>p7^ THEN sum==+1 FI
IF p9^>p8^ THEN sum==+1 FI
IF p2^>p9^ THEN sum==+1 FI
IF sum=1 THEN
IF step1 THEN
p24=p4 p68=p6
ELSE
p24=p2 p68=p8
FI
IF p2^+p4^+p68^<3 AND p24^+p6^+p8^<3 THEN
change(count)=p1 count==+1
FI
FI
FI
FI
p1==+1 p2==+1 p3==+1 p4==+1 p5==+1
p6==+1 p7==+1 p8==+1 p9==+1
OD
OD
step1=1-step1
FOR i=0 TO count-1
DO
p1=change(i) p1^=0
OD
UNTIL count=0
OD
RETURN

PROC Main()
BYTE ARRAY image1=[
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0
0 1 1 1 0 0 0 1 1 1 1 0 0 0 0 0 1 1 1 1 0 0 1 1 1 1 0 0 0 0 0 0
0 1 1 1 0 0 0 0 1 1 1 0 0 0 0 0 1 1 1 0 0 0 0 1 1 1 0 0 0 0 0 0
0 1 1 1 0 0 0 1 1 1 1 0 0 0 0 0 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0
0 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0
0 1 1 1 0 1 1 1 1 0 0 0 0 0 0 0 1 1 1 0 0 0 0 1 1 1 0 0 0 0 0 0
0 1 1 1 0 0 1 1 1 1 0 0 1 1 1 0 1 1 1 1 0 0 1 1 1 1 0 1 1 1 0 0
0 1 1 1 0 0 0 1 1 1 1 0 1 1 1 0 0 1 1 1 1 1 1 1 1 0 0 1 1 1 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0]
BYTE ARRAY image2=[
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0
0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0
0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0
0 1 1 1 1 1 1 1 1 0 0 0 0 0 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0
0 0 0 1 1 1 1 1 1 0 0 0 0 0 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 0 0 0 0 0 0 0 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0
0 0 0 1 1 1 1 1 1 0 0 0 0 0 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 1 1 1 1 1 1 0 0 0 0 0 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 1 1 1 1 1 1 0 0 0 0 0 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 1 1 1 1 1 1 0 0 0 0 0 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 0 0 0 0 0 0 0 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0
0 1 1 1 1 1 1 1 1 0 0 0 0 0 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0
0 1 1 1 1 1 1 1 1 0 0 0 0 0 1 1 1 1 1 1 1 0 1 1 1 1 1 1 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 1 1 1 1 1 1 0 0
0 1 1 1 1 1 1 1 1 0 0 0 0 0 1 1 1 1 1 1 1 0 1 1 1 1 1 1 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 1 1 1 1 1 1 0 0
0 1 1 1 1 1 1 1 1 0 0 0 0 0 1 1 1 1 1 1 1 0 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 0 1 1 1 1 1 1 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0]
BYTE width1=[32],height1=[10],width2=[59],height2=[18]
BYTE CH=\$02FC

Graphics(7+16)
Color=1
SetColor(0,0,\$00)
SetColor(4,0,\$04)
SetColor(1,0,\$0C)

DrawImage(image1,0,0,width1,height1)
Thinning(image1,width1,height1)
DrawImage(image1,width1+10,0,width1,height1)

DrawImage(image2,0,height1+10,width2,height2)
Thinning(image2,width2,height2)
DrawImage(image2,width2+10,height1+10,width2,height2)

DO UNTIL CH#\$FF OD
CH=\$FF
RETURN	```

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