MultiTouch Example

This visualization example shows how to evaluate and handle touch events of MultiTouch displays in CODESYS.

Product description

This visualization example shows how to evaluate and handle touch events of MultiTouch displays in CODESYS.
If visualization is used on a MultiTouch display, then an additional control concept is available to the user.
Apart from the usual mouse and keyboard events, gestures and touch events are evaluated and processed.

Supported gestures

• Pan gesture: pressing, shifting and releasing with a finger moves the contents of a window or a tab
• Flick gesture: fast shifting of a finger in an area, i.e. "flicking", leads to switching between different visualization screens
• Multi touch events: operating with several fingers at a time

Several elements in a visualization screen can be actuated at the same time with several fingers. Thus it is possible to develop a two-hand control or a virtual mixer in which several sliders can be actuated at the same time.

The IGestureEventHandler interface of the VisuElems.VisuElemBase library enables IEC 61131-3 code to
be implemented in order to react to gestures. A gesture event can be intercepted and consequential actions can
be implemented.

The following clients can execute visualization on a MultiTouch device

• CODESYS TargetVisu on a device with Windows operating system
• CODESYS TargetVisu on a device with Linux operating system

More information

The project MultiTouchExample.project shows the usage of the interface IGestureEventHandler2.
The function block GesturesHandler implements the interface IGestureEventHandler2. At first the event
handler must be registered at the event manager. This is done in the method FB_Init of the function block
GesturesHandler. The methods HandleFlickGesture, HandlePanGesture and HandleTouchEvent will be
called if a corresponding event occurs.

The example contains following functions:

Scrolling: Scrolling inside of frames and tab controls
Multiple inputs: Simultaneous control of input elements
Two-hand inputs: The example demonstrates the input handling with two hands
Handling in IEC: Event handling of touch events in IEC 61131-3; the example displays the current touch points at the screen
Flick detection: Counts the horizontal and vertical flick events

System requirements and restrictions

Screenshot of Visualization

Screenshot of Visualization

Screenshot of Visualization