## Context Free Art – Tutorial 9

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These exercises take a closer look at the colour information, hue, saturation and brightness.

```startshape Bryan

path Line {
MOVETO {x 0 y -9}
LINETO {x 0 y 9}
STROKE {sat 1 b 1}
}

rule Bryan {
360 * {x 0.05 h 1} Line {}
}```
```startshape Bryan

path Line {
MOVETO {x 0 y -9}
LINETO {x 0 y 9}
STROKE {h 200 sat 0 b 1}
}

rule Bryan {
400 * {x 0.05 sat 0.003} Line {}
}```

```startshape Bryan

path Line {
MOVETO {x 0 y -9}
LINETO {x 0 y 9}
STROKE {h 0 sat 1 b 0}
}

rule Bryan {
400 * {x 0.05 b 0.003} Line {}
}```
```startshape MyShape

rule MyLine {
TRIANGLE {s 0.016 1 sat 1 b 1}
}

rule MyShape {
360 * {r 1 h 1} MyLine {y -0.60}
}```

## Context Free Art – Tutorial 8

By using the same square, we further experiment with the various options in the STROKE command.

```STROKE {p miterjoin}

STROKE {p roundjoin}

STROKE {p beveljoin}```

```startshape MyShape

path Shape1 {
MOVETO {x -0.5 y -0.5}
LINETO {x 0.5 y -0.5}
LINETO {x 0.5 y 0.5}
STROKE {p buttcap}
}

path Shape2 {
MOVETO {x -0.5 y -0.5}
LINETO {x 0.5 y -0.5}
LINETO {x 0.5 y 0.5}
STROKE {p roundcap}
}

path Shape3 {
MOVETO {x -0.5 y -0.5}
LINETO {x 0.5 y -0.5}
LINETO {x 0.5 y 0.5}
STROKE {p squarecap}
}

rule MyShape {
Shape1 {x -1.5}
Shape2 {x 0}
Shape3 {x 1.5}
}```

## 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 iso win 10en. 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 {}
}```