TAChart is a

component Circuit Component may refer to: •Are devices that perform functions when they are connected in a circuit. In engineering, science, and technology Generic systems * System components, an entity with discrete structure, such as an assem ...

for the Lazarus IDE that provides charting services. Similar to Tchart and

Teechart TeeChart is a charting library for programmers, developed and managed by Steema Software of Girona, Catalonia, Spain. It is available as commercial and non-commercial software. TeeChart has been included in most Delphi and C++Builder products si ...

for Delphi it supports a collection of different chart types including

bar chart A bar chart or bar graph is a chart or graph that presents categorical data with rectangular bars with heights or lengths proportional to the values that they represent. The bars can be plotted vertically or horizontally. A vertical bar chart i ...

s, pie charts,

line chart A line chart or line graph or curve chart is a type of chart which displays information as a series of data points called 'markers' connected by straight line segments. It is a basic type of chart common in many fields. It is similar to a ...

s and point series. Apart from a screen canvas, output is possible in form of SVG, OpenGL, printer, WMF, and other formats. TAChart is bundled with the

Lazarus Component Library The Lazarus Component Library, abbreviated ''LCL'' is a visual software component library for the Lazarus IDE. Description The LCL consists of a collection of units that provide components and classes especially for visual tasks. It is based ...

. Although not intended to be a TChart clone, why its usage differs in certain points, its basic functionality is very similar and some source code written for TeeChart may be reused.

History

The first version of TAChart was developed by Philippe Martinole for the TeleAuto project, a program for automation of astronomic observations. Later functionality was introduced by Luis Rodrigues while porting the

Epanet EPANET (Environmental Protection Agency Network Evaluation Tool) is a public domain, water distribution system modeling software package developed by the United States Environmental Protection Agency's (EPA) Water Supply and Water Resources Divisi ...

application from Delphi to Lazarus. In the ensuing years the code has extensively rewritten, expanded and is now maintained by Alexander Klenin.

Data sources

TAChart is able to use input from various sources. Examples include lists of real values, user defined buffers in the computer's memory, vectors of random values, fields in

database In computing, a database is an organized collection of data stored and accessed electronically. Small databases can be stored on a file system, while large databases are hosted on computer clusters or cloud storage. The design of databases s ...

s, calculated values provided by pre-defined functions and results of embedded code written in

Pascal Script Pascal Script is a scripting language based on the programming language Pascal that facilitates automated runtime control over scriptable applications and server software. It is implemented by a free scripting engine that includes a compiler and ...

References

External links

TAChart documentation in the FreePascal wiki
{{Use dmy dates, date=March 2020 Programming tools Component-based software engineering Charts Free Pascal