Hello. I'm working on doing some tactile versions of pie graphs for a student, but I'm stuck. The Guidelines and Standards for Tactile Graphics 6.3 says pie graphs "must be presented as a tactile graphic rather than a list." and I understand why. However, for the current chapter in this class, I need to make 2 pie graphs that have 11 and 12 different "slices". I know we're also not supposed to make things too complicated, too large (and therefore hard to tell what it is), have too many different textures (preferably 5 or less), or have the lines so close together I risk them blending together. What is the best way to do this? Is there a way to simplify this? Thank you.
The attached graphic was sketched by one of our TG experts. The pie chart is approximately 5" in diameter and as shown will fit easily on an 11.5" x 11" page. As shown, this includes all of the numbers reflected on the print graphic, and full labels for some items from the print graphic. Long labels were reduced to 3-cell abbreviations that should be included on the braille key.
When creating the key, follow GSTG 18.104.22.168 with the order of items in the key the same as the order in which the sections appear on the graph in clockwise order, starting at the top (at the 12:00 position).
Notice that not all labels have leader lines. These should be used only where things get crowded. Otherwise, we may make the graphic harder to interpret.
The center of the graph is crowded, so it will be necessary to implement GSTG 6.3.4 and not draw all of the division lines all the way to the center. This is reflected in the attached graphic.
Following wording in GSTG 6.3.6, we want the interior of the graph to be unobstructed (no textures). It is advisable to never use textures in the center of a pie chart, for the same reason as you would move labels outside if print showed them inside the circle. This ensures better readability of the whole.
Let us know if this addresses all of your questions!