# Context Free Art – Tutorial 7

We continue the study of path command. Take a look of the closed shape, a square.

```startshape MyShape

path Line {
MOVETO {x -0.5 y -0.5}
LINETO {x 0.5 y -0.5}
LINETO {x 0.5 y 0.5}
LINETO {x -0.5 y 0.5}
LINETO {x -0.5 y -0.5}
CLOSEPOLY {}
STROKE {}
}

rule MyShape {
Line {}
}```

If by any chances, you type the wrong position for the last end point or there is rounding error after a sequence of calculation, you may end of with:

```startshape MyShape

path Line {
MOVETO {x -0.5 y -0.5}
LINETO {x 0.5 y -0.5}
LINETO {x 0.5 y 0.5}
LINETO {x -0.5 y 0.5}
LINETO {x -0.45 y -0.45}
CLOSEPOLY {}
STROKE {}
}

rule MyShape {
Line {}
}```

Note the CLOSEPOLY command will connect an extra line segment to close the shape if there is a gap between the beginning and the end points. In case we want to get rid of the error, we can use the CLOSEPOLY command with an extra parameter align.

```startshape MyShape

path Line {
MOVETO {x -0.5 y -0.5}
LINETO {x 0.5 y -0.5}
LINETO {x 0.5 y 0.5}
LINETO {x -0.5 y 0.5}
LINETO {x -0.45 y -0.45}
CLOSEPOLY {p align}
STROKE {}
}

rule MyShape {
Line {}
}```