GesturePosX (Function)

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Position of several pointers
Limitations
Various

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GesturePosX (Function)

In french: GestePosX

Returns the horizontal position of the pointer (finger or stylus). The returned value depends on how the function is used:

Used in an event linked to the movement of the pointer (click, move, pressed, released, etc.), returns the horizontal position (X) of the pointer (finger or stylus) in relation to the control or window.
Used in another event or process, returns the last known position of the pointer in the control.
If the device supports the multi-touch movements, used to retrieve the position of a specific contact point.

Some use examples: You can find out:

the position of the pointer (finger or stylus) when clicking on a Image control (function used in the "Click" event of the Image control).
the position of the pointer (finger or stylus) during its move on the surface of a control (function used in the optional event "Rollover" of a control).
the position of the nth pointer during a multi-touch movement on the surface of a control (if it is supported by the device).

Versions 18 and later

This function is now available for iPhone/iPad applications.

New in version 18

This function is now available for iPhone/iPad applications.

Versions 19 and later

This function is now available in browser code.

New in version 19

This function is now available in browser code.

Example

// Position du pointeur (doigt ou stylet) lors d'un clic dans un champ Image
PositionX is int = GesturePosX(1, gpControl)

// Position du second pointeur enfoncé sur la surface d'un champ
PositionX is int = GesturePosX(2, gpControl)

// Position du pointeur par rapport au coin haut gauche de l'image affichée par le champ
// lorsque cette image n'est pas affichée dans sa totalité
PositionX is int = GesturePosX(1, gpImage)

Syntax

<Result> = GesturePosX([<Pointer subscript> [, <Marker>]])

<Result>: Integer

Horizontal position (or X coordinate) in pixels of the pointer in relation to the relevant marker,
-1 if an error occurred.

<Pointer subscript>: Optional integer

Subscript of the pointer (finger) whose horizontal position must be retrieved. The first pointer in contact with the screen corresponds to the subscript 1.
If this parameter is not specified, the function will return the position of the first pointer in contact with the screen.
If the subscript does not correspond to a pointer in contact with the screen or if the specified subscript is greater than 1 and if the device does not support the multi-touch, the function will return -1.

<Marker>: Optional Integer constant

Marker used to calculate the position:
gpControl
(default value) Position of the pointer in relation to the top left corner of the control (or window if the event occurred on the window).
gpScreen Position of the pointer in the screen (in relation to the top left corner of the screen).
gpWindow Position of the pointer in relation to the top left corner of the window to which belongs the control on which the event occurred.
This constant is not available
gpImage Position of the pointer in relation to the top left corner of the image displayed by an Image control.

This constant can be used when an image is not entirely displayed in an Image control in order to find out the position of the pointer in the source image (while taking the possible zoom into account).

This constant should only be used when the GesturePosX function is called in an event associated with an Image control. Otherwise, the function GesturePosX will return -1.
Versions 19 and later
gpPage
New in version 19
gpPage
gpPage Position of the pointer in relation to the top left corner of the page to which belongs the control on which the event occurred.
This constant is not available.

Remarks

Position of several pointers

To manage the position of several pointers on the screen, the device must be multi-touch capable.

Limitations

In the Android simulator or emulator, the GesturePosX function only retrieves the position of the first pointer.
The browser used must support the multi-touch feature.

Various

To find out the vertical position (Y) of a pointer, use GesturePosY.
To find out the number of pointers in contact with the screen, use GestureNbPointer.
To find out the subscript of the pointer that triggered the execution of a process linked to a movement on the screen, use GestureCurrentPointer.

Component: WDJS.DLL