IMAQ Select Point VI

LabView NI Vision

IMAQ Select Point VI

Owning Palette: Select Region of InterestInstalled With: NI Vision Development Module

Allows the user to specify the position of a point in the image. IMAQ Select Point displays the image in the specified window and provides a point tool. IMAQ Select Point returns the coordinates of the point selected when the user clicks OK in the window.

IMAQ Select Point

ci32.gif

Window Number (0...15)specifies the window in which to display the image. When you select the default value of ?1, this VI uses a modal dialog window, centered in the screen. When you select a regular NI Vision window number (0?15), the VI displays Image In in the specified window and temporarily sets the NI Vision window to modal mode. When the user clicks OK or Cancel in the window, the attributes of the window are set back to their initial values.

cgenclasstagrefflat.gif

Image In is a reference to the image on which the user selects the Point.

cstr.gif

Prompt specifies a message string to display in the title bar of the window. Use this control to provide the user with instructions about selecting the object.

cerrcodeclst.gif

error in (no error) describes the error status before this VI or function runs. The default is no error. If an error occurred before this VI or function runs, the VI or function passes the error in value to error out. This VI or function runs normally only if no error occurred before this VI or function runs. If an error occurs while this VI or function runs, it runs normally and sets its own error status in error out. Use the Simple Error Handler or General Error Handler VIs to display the description of the error code. Use error in and error out to check errors and to specify execution order by wiring error out from one node to error in of the next node.

cbool.gif

status is TRUE (X) if an error occurred before this VI or function ran or FALSE (checkmark) to indicate a warning or that no error occurred before this VI or function ran. The default is FALSE.

ci32.gif

code is the error or warning code. If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code.

cstr.gif

source describes the origin of the error or warning and is, in most cases, the name of the VI or function that produced the error or warning. The default is an empty string.

c1dnclst.gif

Color Palette is used to apply a color palette to the image window. Color Palette is an array of clusters constructed by the user or supplied by the IMAQ GetPalette VI. This palette is composed of 256 elements for each of the three color planes (red, green, and blue). A specific color is the result of applying a value between 0 and 255 to each of the three color planes. If the three planes have identical values, a gray level is obtained (0 specifies black and 255 specifies white). If the image type requires a color palette and it is not supplied, a grayscale color palette is generated and written.

Tip  For best results, set your video adapter to high color or true color.
cu8.gif

Red is the value of the red color plane.

cu8.gif

Green is the value of the green color plane.

cu8.gif

Blue is the value of the blue color plane.

igenclasstagrefflat.gif

Image Out (duplicate) is a reference to Image In. This VI does not modify the image connected to the Image In input.

inclst.gif

Point is a cluster that specifies the coordinates of the point chosen by the user.

isgl.gif

X is the x-coordinate of the point.

isgl.gif

Y is the y-coordinate of the point.

ibool.gif

Cancelled returns TRUE if the user ends the selection by clicking Cancel in the window.

ierrcodeclst.gif

error out contains error information. If error in indicates that an error occurred before this VI or function ran, error out contains the same error information. Otherwise, it describes the error status that this VI or function produces. Right-click the error out indicator on the front panel and select Explain Error from the shortcut menu for more information about the error.

ibool.gif

status is TRUE (X) if an error occurred or FALSE (checkmark) to indicate a warning or that no error occurred.

ii32.gif

code is the error or warning code. If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code.

istr.gif

source describes the origin of the error or warning and is, in most cases, the name of the VI or function that produced the error or warning. The default is an empty string.