poIImagePlane SetPosition

Sets an image plane in the background or foreground mode to a predefined window location.

Syntax

Imageplane_handle SetPosition position

Application

HyperView Tcl Modify

Description

This command positions an image plane within the client window. This call is only valid when the image plane is in foreground or background mode. If the StretchToFit flag is set, positioning has no affect.

Inputs

position
Indicates the new image position:
Center
Center of the window.
NW or NORTHWEST
Upper left corner
NE or NORTHEAST
Upper right corner
SW or SOUTHWEST
Lower left corner
SE or SOUTHEAST
Lower right corner

Example

To create an image plane, remove all "white" from the image using the color alpha filter (making those areas transparent), and then scale the image plane to half the size and move it to the upper left corner:
hwi OpenStack
if {[catch {
    hwi GetActiveClientHandle client_handle
    hwi GetSessionHandle session_handle
    client_handle GetImagePlaneCtrlHandle ipc_handle
    set ipid1 [ipc_handle AddImagePlane Logo1]
    ipc_handle GetImagePlaneHandle imageplane_handle $ipid1
    imageplane_handle SetFileName g:/samples2/VideoOverlay/Altair_logo.jpg
    imageplane_handle SetMode background
    imageplane_handle SetCrop 0 0 0.9995 0.995
    imageplane_handle SetUserTransform "0.5 0.5 0 0"
    imageplane_handle SetPosition "NW"
    imageplane_handle SetFilterType ColorAlpha;
    imageplane_handle SetFilterMode equal;
    imageplane_handle SetColorAlphaTarget "255 255 255"
    imageplane_handle SetColorAlphaTolerance 18
    imageplane_handle SetMipMapMode Linear1
    client_handle Draw
} result]} {
    global errorInfo;
    puts stderr $result;
    puts "[session_handle GetError]";
    puts stderr "*** Tcl TRACE ***";
    puts stderr $errorInfo;
} else {
    puts "No errors.";
    puts "Warnings: ";
    puts "    [session_handle GetError]";
}

hwi CloseStack

Errors

Returns HW_InvalidHandle if the image plane handle is invalid, or HW_InvalidArgs if the position is incorrectly specified.