2 Visual Components Manuals

3.3 Programming Interface for Controller Tasks − VISAPI
The programming interface provides the opportunity to build a bridge between the controller application and the
Visual Components application. It enables control of the visualization application while it is operating as well as
output of user−defined graphics from the control application.
This section provides a brief VISAPI overview which discusses the most important functions used.
For a more detailed description of each function, click on the respective link.
The VISAPI − General tutorial should be read before reading descriptions of the individual functions.
3.3.1 Requirements and Initializing
VA_Setup
VA_SetupX
VA_Saccess, VA_Srelease
Call Description
Initializing the
VISAPI
Advanced
Initialization
General
Functions
The VISAPI is initialized with these functions. It is very important that these functions are used correctly.
Therefore, we recommend reading VISAPI − General Instructions.
3.3.2 Graphics and Text
Call Description
VA_Rect Rectangles
VA_Line Lines
VA_Ellipse Ellipses and Circles
VA_Textout, VA_GetTextByTextGroup Texts
VA_Redraw, VA_GetDisplayInfo General
These routines can be used to output general text and graphics. Functions for drawing lines, rectangles, and
ellipses are available.
3.3.3 Setting Contrast and Brightness
Call Description
VA_SetContrast Contrast
VA_SetBrightness Brightness
These functions can be used to change contrast and brightness on the target.
Introduction to Visual Components 2.3
134 3.3 Programming Interface for Controller Tasks − VISAPI