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The following documents the Pentaho Standards for Charting Terminology (pending review).
Since the images may be less-than-clear, the attached PDF document
contains the same images in a more clear format.
Pentaho Charting Terminology Standards
Chart Categories
Charts will be broken into 2 categories for this description:
- AXIS BASED CHARTS are charts that have one-or-more visible axis (examples: lines, bars, catigorical, etc.)
- NON-AXIS BASED CHARTS do not have any visible axis (pie, polar, thermometer, etc.)
Since the above categories only differ in how the data is represented inside the plot area, there are a number of charting elements that are common to both chart categories:
| CHART | The entire area being generated by the charting API. |
| PLOT | The area of the chart in which the data values are being represented. |
| TITLE | The main text used to name or describe the chart. |
| SUBTITLE | Subsequent text used to enhance the description of the chart. |
| LEGEND ITEM | A visual description of the mapping between a visual chart element and the business entity represented. |
| LEGEND | The area in which the LEGEND ITEM(s) are displayed |
| CHART BACKGROUND |
The area of a chart upon which all other elements are placed. |
| PLOT BACKGROUND |
The area of a plot upon which all other elements are placed. |
NON-AXIS Based Charts
Inside the plot area of non-axis based charts, there are a number of elements:
| EXPLODED | Any element of a chart that is slightly moved or exaggerated to show emphasis. |
| SECTION LABEL | The text inside the plot that indicates the name of a section |
AXIS Based Charts
Axis based charts have two or more axis in the plot area used in the chart representation. Axis based charts have the following common elements inside and outside the plot area:
| Concept | Description |
Altername Names |
| AXIS | A reference line (or ruler) upon which one dimension of the data is charted | |
| RANGE AXIS | The ruler(s) against which the value dimension of the data is measured |
|
| PRIMARY RANGE AXIS | The 1st or most-important range axis | |
| SECONDARY RANGE AXES |
All range axss that are not the primary range axis |
|
| DOMAIN AXIS | The ruler(s) against which the category dimension of the data is measured |
|
| PRIMARY DOMAIN AXIS | The 1st or most-important domain axis | |
| SECONDARY DOMAIN AXES |
All domain axes that are not the primary domain axis |
|
| AXIS TITLE | The descriptive text for an axis | |
| ORIGIN | The intersection of the all the axes | |
| MAJOR TICK | A mark on an axis at which a value is displayed and represented | |
| MINOR TICK | A mark on an axis at which a value is implied but not displayed | |
| TICK LABEL | The value displayed at a tick mark | |
| GRID LINE | A line across the plot at a MAJOR TICK which helps visually indicate a value | |
| ITEM LABEL | Text which indicates one value of the data at a specific data point on the chart | |
| SCALE | The range of values represented on an axis | |
| MAJOR INTERVAL | The value difference between major tick marks | |
| MINOR INTERVAL | The value difference between minor tick marks | |
| DATA POINT | One value being represented on a chart | |
| DATA SERIES | A group of DATA POINTS all of which are represented the same way (bar, line, etc.) | |
| ANNOTATION |
A piece of information placed in the plot that indicates important information related to the charted data. |
|
| BAR GAPS |
The distance between bars of the same category on a bar category chart |
|
| CATEGORY GAPS |
The distance between the last bar of one category and the first bar of the next category on a bar category chart |
|
| TRANSPARENCY |
An amount (percentage) that indicates how much of the items beneath the specified item may be seen (100% = all, 0% = none) |
|
| 0 (ZERO) LINE |
A line that indicates 0 (zero) on the Range Axis (not always at the origin) |
|
| 3D |
An indication that elements of the chart are rendered with a depth dimension |
