The Microsoft Excel File Format - OpenOffice.org
The Microsoft Excel File Format - OpenOffice.org
The Microsoft Excel File Format - OpenOffice.org
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7.2 General Chart Structure<br />
7.2 General Chart Structure<br />
7.2.1 Chart Stream or Substream<br />
All objects a chart is made of are <strong>org</strong>anised in a strict hierarchy which is also reflected in the file format. <strong>The</strong> Chart<br />
(Sub)stream consists of page settings (similar to a regular Sheet Substream) followed by the chart description. Each<br />
chart contains a list of data series information (a list of values for the data points, and formatting information for the<br />
series and the data points), and additional information about all axes, series groupings, chart type, legend, data table, and<br />
so on.<br />
Structure of the Chart Substream, BIFF5-BIFF8:<br />
● BOF Type = chart (➜5.8)<br />
○ Page Settings Block ➜4.4<br />
○ Worksheet Protection Block ➜4.18 (without SCENPROTECT record)<br />
● Global Chart Block ➜7.2.3<br />
● DIMENSION ➜5.35<br />
● Worksheet View Settings Block ➜4.5 (WINDOW2 and SCL records only)<br />
● EOF ➜5.37<br />
7.2.2 Chart Record Block<br />
<strong>The</strong> chart stream contains blocks of records describing specific details of the chart. All record blocks are embedded into<br />
other record blocks up to and including the Global Chart Block (➜7.2.3) which represents the entire chart and is stored<br />
in the Chart (Sub)stream (➜7.2.1).<br />
Definition: Chart record block<br />
A chart record block is a group of records in the Chart (Sub)stream that describes a specific object or other<br />
specific data in the chart. A block consists of one or more header records (in a fixed order) and the inner block<br />
records which are enclosed into special block-start and block-end records. A chart record block may contain<br />
other embedded chart record blocks.<br />
Structure of a chart record block:<br />
●●<br />
○<br />
Block header record(s)<br />
● CHBEGIN Begin of chart record block (➜7.8)<br />
Embedded block records<br />
● CHEND End of chart record block (➜7.9)<br />
It is possible to have an empty block that consists of the header records only, or that consists of the header records<br />
followed by an empty pair of CHBEGIN and CHEND records.<br />
Chart record blocks are named according to their (first) header record.<br />
Example: <strong>The</strong> chart record block that describes a text object is led by a CHTEXT record. <strong>The</strong>refore the chart<br />
record block is called “CHTEXT Block”.<br />
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