OpenCV  5.0.0-pre
Open Source Computer Vision
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Functions
WinRT support

Detailed Description

This figure explains new functionality implemented with WinRT GUI. The new GUI provides an Image control, and a slider panel. Slider panel holds trackbars attached to it.

Sliders are attached below the image control. Every new slider is added below the previous one.

See below the example used to generate the figure:

void sample_app::MainPage::ShowWindow()
{
static cv::String windowName("sample");
cv::winrt_initContainer(this->cvContainer);
cv::namedWindow(windowName); // not required
cv::Mat image = cv::imread("Assets/sample.jpg");
cv::Mat converted = cv::Mat(image.rows, image.cols, CV_8UC4);
cv::cvtColor(image, converted, COLOR_BGR2BGRA);
cv::imshow(windowName, converted); // this will create window if it hasn't been created before
int state = 42;
cv::TrackbarCallback callback = [](int pos, void* userdata)
{
if (pos == 0) {
cv::destroyWindow(windowName);
}
};
cv::TrackbarCallback callbackTwin = [](int pos, void* userdata)
{
if (pos >= 70) {
}
};
cv::createTrackbar("Sample trackbar", windowName, &state, 100, callback);
cv::createTrackbar("Twin brother", windowName, &state, 100, callbackTwin);
}
n-dimensional dense array class
Definition mat.hpp:816
int cols
Definition mat.hpp:2155
int rows
the number of rows and columns or (-1, -1) when the matrix has more than 2 dimensions
Definition mat.hpp:2155
std::string String
Definition cvstd.hpp:151
#define CV_8UC4
Definition interface.h:102
void winrt_initContainer(::Windows::UI::Xaml::Controls::Panel^ container)
Initializes container component that will be used to hold generated window content.
void(* TrackbarCallback)(int pos, void *userdata)
Callback function for Trackbar see cv::createTrackbar.
Definition highgui.hpp:235
void imshow(const String &winname, InputArray mat)
Displays an image in the specified window.
void namedWindow(const String &winname, int flags=WINDOW_AUTOSIZE)
Creates a window.
void destroyAllWindows()
Destroys all of the HighGUI windows.
void destroyWindow(const String &winname)
Destroys the specified window.
int createTrackbar(const String &trackbarname, const String &winname, int *value, int count, TrackbarCallback onChange=0, void *userdata=0)
Creates a trackbar and attaches it to the specified window.
CV_EXPORTS_W Mat imread(const String &filename, int flags=IMREAD_COLOR)
Loads an image from a file.
void cvtColor(InputArray src, OutputArray dst, int code, int dstCn=0)
Converts an image from one color space to another.
@ COLOR_BGR2BGRA
add alpha channel to RGB or BGR image
Definition imgproc.hpp:541

Functions

void cv::winrt_initContainer (::Windows::UI::Xaml::Controls::Panel^ container)
 Initializes container component that will be used to hold generated window content.
 

Function Documentation

◆ winrt_initContainer()

void cv::winrt_initContainer ( ::Windows::UI::Xaml::Controls::Panel^  container)

#include <opencv2/highgui/highgui_winrt.hpp>

Initializes container component that will be used to hold generated window content.

Parameters
containerContainer (Panel^) reference that will be used to hold generated window content: controls and image.
Note
Must be called to assign WinRT container that will hold created windows content.