# tBarChart Generates a bar chart from the input data to ease technical analysis. tBarChart reads data from an input flow and transforms the data into a bar chart in a PNG image file. ## tBarChart Standard properties These properties are used to configure tBarChart running in the Standard Job framework. The Standard tBarChart component belongs to the Business Intelligence family. The component in this framework is available in all Talend products. ## Basic settings | Properties | Description | | --- | --- | | Schema and Edit
schema |

A schema is a row description. It defines the number of fields (columns) to be processed and passed on to the next component. When you create a Spark Job, avoid the reserved word line when naming the fields.

Click Edit schema to make changes to the schema. If the current schema is of the Repository type, three options are available:
- View schema: choose this option to view the schema only.
- Change to built-in property: choose this option to change the schema to Built-in for local changes.
- Update repository connection: choose this option to change the schema stored in the repository and decide whether to propagate the changes to all the Jobs upon completion.
  
  If you just want to propagate the changes to the current Job, you can select No upon completion and choose this schema metadata again in the Repository Content window.
Information noteNote:
The schema of tBarChart contains three read-only columns named series (string), category (string), and value (integer) respectively, in a fixed order. The data in any extra columns will be only passed to the next component, if any, without being presented in the bar chart.
Built-in: The schema is created and stored locally for this component only. For more information about a component schema in its Basic settings tab, see Basic settings tab.
Repository: The schema already exists and is stored in the Repository, hence can be reused. For more information about a component schema in its Basic settings tab, see Basic settings tab.

| | Sync columns | Click to synchronize the output file schema with the input file
schema. The Sync function only displays once the Row connection is linked with the output
component. | | Generated image path | Name and path of the output image file. | | Chart title | Enter the title of the bar chart to be generated. | | Include legend | Select this check box if you want the bar chart to include a
legend, indicating all series in different colors. | | 3Dimensions | Select this check box to create an image with 3D effect. By
default, this check box is selected and the bars representing the
series of each category will be stacked one over another. If this
check box is cleared, a 2D image will be created, with the bars
displayed one besides another along the category axis. | | Image width and Image
height | Enter the width and height of the image file, in pixels. | | Category axis name and Value axis
name | Enter the category axis name and value axis name. | | Foreground alpha | Enter an integer in the range of *0* to
*100* to define the transparency of the
image. The smaller the number you enter, the more transparent the
image will be. | | Plot orientation | Select the plot orientation of the bar chart: VERTICAL or HORIZONTAL. | ## Advanced settings | Properties | Description | | --- | --- | | tStat
Catcher Statistics | Select this check box to collect log data at the component
level. | | Enable parallel execution | Select this check box to perform high-speed data processing, by treating
multiple data flows simultaneously. Note that this feature depends on the database or
the application ability to handle multiple inserts in parallel as well as the number of
CPU affected. In the Number of parallel executions
field, either:

Enter the number of parallel executions desired.
Press Ctrl+Space and select the appropriate context variable from the list. For further information about context variables, see Using contexts and variables.

The Action on table field is not available with the parallelization function. Therefore, you must use a tCreateTable component if you want to create a table.
When parallel execution is enabled, it is not possible to use global variables to retrieve return values in a subJob.

| ## Global Variables | Variables | Description | | --- | --- | | Global Variables | NB\_LINE: the number
of rows read by an input component or transferred to an output component. This is an
After variable and it returns an integer.

ERROR\_MESSAGE: the error message generated by the
component when an error occurs. This is an After variable and it returns a string. This
variable functions only if the Die on error checkbox is
cleared, if the component has this checkbox.

A Flow variable functions during the execution of a component
while an After variable functions after the execution of the component.

To fill up a field or expression with a variable, press Ctrl+Space to access the variable list and choose the variable to use from
it.

For more information about variables, see [Using contexts and variables](https://help.qlik.com/talend/r/en-US/8.0/studio-user-guide/contexts-and-variables). | ## Usage | Usage guidance | Description | | --- | --- | | **Usage rule** | This component is mainly used as Output component. It requires an
Input component and Row main link
as input. | **Related concepts** * [Creating a bar chart from the input data](https://help.qlik.com/talend/en-US/components/8.0/chart/tbarchart-tmap-tfileoutputdelimited-tpostjob-creating-bar-chart-from-input-data-standard-component-this)