Hello,
I would like to allow a user to select a rotated rectangle from an image acquired from a camera. The function imaqSelectRect looks to be exactly what I need (and is included in the help file). However the function seems to be missing from the actual ni_vision library. Any thoughts on where this function may have gone? For completeness I have copied the relevant "help" text on this function below.
In the absence of this function, how can I go about getting back a RotatedRect from an image control window? I can enable the rotated rectangle selection tool, but in my callback that I am using to capture events from this window (using the imaqSetEventCallback function) it seems like all that is passed is a standard Rect struct as opposed to a RotatedRect (even though the tool used is the rotate rectangle selection tool)
Any help is greatly appreciated.
Thanks,
Alex Corwin
imaqSelectRect
Usage
int imaqSelectRect(const Image* image, RotatedRect* rect, const ConstructROIOptions* options, int* okay);
Purpose
Displays the image in a modal window and allows the user to draw a rectangle on it. After the user draws the rectangle, the function hides the window.
Image Types Supported
IMAQ_IMAGE_U8, IMAQ_IMAGE_U16, IMAQ_IMAGE_I16, IMAQ_IMAGE_SGL, IMAQ_IMAGE_COMPLEX, IMAQ_IMAGE_RGB, IMAQ_IMAGE_HSL, IMAQ_IMAGE_RGB_U64
Parameters
| Name | Type | Description |
|---|---|---|
| image | const Image* | The image from which the user selects a rectangle. |
| rect | RotatedRect* | On return, this parameter specifies the coordinates of the rectangle chosen by the user. If the user does not select a rectangle, the function sets all of the elements of rect to –1. This parameter is required and cannot be NULL. |
| options | const ConstructROIOptions* | Describes how a function presents the rectangle constructor window. |
| okay | int* | On return, this parameter is TRUE if the user pressed the OK button to end the selection of a rectangle. Otherwise, this parameter is FALSE. Set this parameter to NULL if you do not need this information. |
Return Value
| Type | Description |
|---|---|
| int | On success, this function returns a non-zero value. On failure, this function returns 0. To get extended error information, call imaqGetLastError(). |
Parameter Discussion
options—Set options to NULL to use the default options, as follows:
| windowNumber | IMAQ_MODAL_DIALOG |
| windowTitle | "Select a Rectangle" |
| type | IMAQ_PALETTE_GRAY |
| palette | NULL |
| numColors | 0 |