Creating a pie chart diagram
A pie chart diagram displays attributes in a round pie chart, where each attribute occupies a pie slice proportional to the percentage that the attribute represents from the total of all attributes added to the pie chart. As an example, the following screenshot shows a portion of a state, with pie charts showing the proportion of different racial populations in each county:
By reviewing the pie charts in the preceding screenshot, let's note down a few things:
- The pie slices differ for each county's race attributes and are colored based on each attribute's selected color
- The sizes of the pie charts vary based on the total population in each county
- The pie slice outlines are black and thin
- The pie charts are displayed above the centroid of each polygon
These four noted items, among others that are not noted, are all customizable using the parameters that are available in the Diagrams tab of the Layer Properties window. The Diagrams tab for pie charts has three sections with unique parameters: Rendering, Size, and Placement.
The Rendering section, which is shown in the following screenshot, provides the following parameters:
- Transparency: This is used to specify the transparency percentage for the pie chart
- Line color: This contains the color of the lines surrounding the pie and in-between pie slices.
- Line width: This contains the width of the lines surrounding the pie and in-between pie slices.
- Start angle: This is used to specify the angle from which the pie slices will begin to rotate in a clockwise manner. The available options are Top, Right, Bottom, and Left.
- Show all diagrams: If this is checked, all pie charts are displayed. If unchecked, pie charts that are not able to be placed without colliding with other pie charts will not be placed.
- Scale dependent visibility: If this is checked, the Minimum and Maximum visibility scales can be set:
