689: Highlights

Pens, also known as graphics contexts, contain information that determines how drawing is done.
If you want to change line width, then instantiate the following pattern:
```
the pen setLineWidth: new width. 
```
If you want to change the color with which lines are drawn and text displayed, then include ColorConstants in the pool-dictionary specification of the class, and then instantiate the following pattern, with a color such as ClrRed.
```
the pen foreColor: string-naming color. 
```
If you want to change the font in which strings are displayed, then instantiate the following pattern:
```
the pen font: (Font new faceName: string-naming face). 
```
If you want to draw an open polygon, then instantiate the following pattern:
```
the pen polygon: an array of points. 
```
If you want to draw a filled polygon, then include ColorConstants in the pool-dictionary specification of the class, and then instantiate the following pattern:
```
the pen setFillColor: string-naming color. 
the pen polygonFilled: an array of points. 
```