% starting point

start _ x = 1；

start _ y = 1；

% step size

step _ x =- 1；

step _ y = 1；

Percentage of points to be calculated

num _ point = 5；

% produce arithmetic progression.

point _ x = start _ x:step _ x:start _ x+(num _ point- 1)* step _ x；

point _ y = start _ y:step _ y:start _ y+(num _ point- 1)* step _ y；

% display value

Display (point x)

Display (point y)

% drawing

Drawing (x point, y point)