The form of a polygon is determined by its contour and fill.

The contour is defined by the pen, style and halo and by the options for the corner/end forms. These are all to be found in the Attributes window. The fill can be either a color or a pattern. Fill settings can be changed or redefined in the Fills window.

If you draw a new polygon, it is automatically assigned an equal mixture of the Thick and Thin standard pens. The Thick pen is used from the start point (in counter-clockwise direction) up to the end point, while the Thin pen is used from the end point back to the start point. In a perspective illustration, this form of representation involving two inner and two outer edges is appropriate in most applications. Consequently, the automatic assignment of Thick and Thin is not governed by the pen you have already selected.

If a halo has been set, it is only used on the half of the polygon which has been drawn with the Thick pen. The style, the corner/end forms and the fill are generated automatically from the current attributes selected in the Attributes and Fills windows.

You can change these attributes subsequently in a number of ways. To do this, select the segments or the sides you want to change. Now click the button for the required attribute, e.g. a pen, in the Attributes window. The window of the required attribute appears. You can now change the attribute.

The fill of a polygon can also be changed without having to select the elements (see Show Fill Window).

Double clicking a polygon or a side you have selected changes the pen. The new pen is the switch pen of the old pen (see the Edit pen dialog in Show Attribute Window). This feature allows you, for example, to reverse the distribution of inner and outer edges, i.e. of Thick and Thin, with ease.