Chart labeling system

A computer system comprising:

• a display system;
• a hardware processor;
• and
• a chart generator in a computer system in communication with the display system and the hardware processor, wherein:
• the chart generator selects a section from a group of sections in a circular chart for data that is to be graphically displayed on the display system;
• identifies a section centroid, an inner radius, an outer radius, and an orientation for the section;
• identifies text for the section and a current number of lines of the text;
• identifies a largest size for a polygon centered over the section centroid that will fit in the section of the circular chart such that the chart generator:
• identifies a first dimension of the polygon based on the current number of lines of the text for display in the section;
• identifies a maximum second dimension of the polygon by:
• identifying a central angle for the section;
• and
• based on the first dimension of the polygon, the section centroid, the inner radius, the outer radius, the central angle for the section, and the orientation for the section, using the law of cosines to identify the maximum second dimension of the polygon;
• and
• when the current number of lines of the text does not fit within the polygon having the first dimension and the second dimension, incrementing the current number of lines of the text and repeating the identifying of the largest size for the polygon after incrementing the current number of lines of the text;
• and
• displays the circular chart with the text in the section on the display system when the text fits within the polygon in the section.

A computer program product comprising:

• a non-transitory computer readable storage media;
• program code, stored on the computer readable storage media, for selecting a section from a group of sections in a circular chart for data that is to be graphically displayed on a display system;
• program code, stored on the computer readable storage media, for identifying a centroid, an inner radius, an outer radius, and an orientation for the section;
• program code, stored on the computer readable storage media, for identifying text for the section and a current number of lines of the text;
• program code, stored on the computer readable storage media, for identifying a largest size for a polygon centered over the centroid that will fit in the section of the circular chart such that the second program code:
• identifies a first dimension of the polygon based on the current number of lines of the text for display in the section;
• identifies a maximum second dimension of the polygon by:
• identifying a central angle for the section;
• and
• based on the first dimension of the polygon, the section centroid, the inner radius, the outer radius, the central angle for the section, and the orientation for the section, using the law of cosines to identify the maximum second dimension of the polygon;
• and
• when the current number of lines of the text does not fit within the polygon having the first dimension and the second dimension, incrementing the current number of lines of the text and repeating the identifying of the largest size for the polygon after incrementing the current number of lines of the text;
• and
• program code, stored on the computer readable storage media, for displaying the circular chart with the text in the section on the display system when the text fits within the polygon in the section.