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- Position of several pointers
- Limitations
- Miscellaneous
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 examples of use For example, 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).
PositionX is int = GesturePosX(1, gpControl)
PositionX is int = GesturePosX(2, gpControl)
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 Index of the pointer (finger) whose horizontal position must be retrieved. The first pointer in contact with the screen has index 1.
If this parameter is not specified, the function will return the position of the first pointer in contact with the screen.
If the index does not correspond to a pointer in contact with the screen or if the specified index 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 upper-left corner of the control (or window if the event occurred on the window). | | gpImage | Position of the pointer in relation to the upper-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 GesturePosX is called in an event associated with an Image control. Otherwise, GesturePosX will return -1. | | gpPage | Position of the pointer in relation to the upper-left corner of the page to which belongs the control on which the event occurred. | | gpScreen | Position of the pointer in the screen (in relation to the upper-left corner of the screen). | | gpWindow | Position of the pointer in relation to the upper-left corner of the window to which belongs the control on which the event occurred. |
Remarks Limitations  In the Android simulator or emulator, GesturePosX can only be used to retrieve the position of the first pointer.  The browser used must support the multi-touch feature.
Miscellaneous - 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 index of the pointer that triggered the execution of a process linked to a movement on the screen, use GestureCurrentPointer.
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