[Linux] Trackbar, button, checkbox etc. not working

[dovyski]

[Linux] Trackbar, button, checkbox etc. not working

[Dovyski]

Thank you for using cvui and reporting problems (particularly being your first time using it)! There is nothing wrong with your code, so this issue must be a cvui bug. I'll check on that.

[prabhakarmp]

Hi

There is some problem in coding.

please check below code

#include <opencv2/opencv.hpp>
#include "opencv2/imgproc/imgproc.hpp"

#define CVUI_IMPLEMENTATION
#include "cvui.h"


using namespace cv;

int main() {

	// Create a frame where components will be rendered to.
	cv::Mat frame = cv::Mat(250, 500, CV_8UC3);

	cvui::init("test");
	
	// create a trackbar
	int bigN = 6;
	bool checked = false;
	while (true) {
		// Fill the frame with a nice color
		frame = cv::Scalar(49, 52, 49);

		
		cvui::trackbar(frame, 110, 80, 250, &bigN, (int)2, (int)15);

		
		cvui::checkbox(frame, 90, 50, "Example checkbox", &checked);

		if (cvui::button(frame, 110, 150, "Find images!")) {
			printf("clicked\n");
		};

		cvui::update("test");

		// Update cvui stuff and show everything on the screen
		cv::imshow("test", frame);


		if (cv::waitKey(1) == 27) {
			break;
		}

		
	}

	return 0;
}

[Dovyski]

@prabhakarmp can you describe a bit better what is wrong with your code, please? The UI components are not working or anything different?

[prabhakarmp]

@Dovyski

int bigN = 6;
bool checked = false;

These variables are declared as local variables which needs to be Global variable.

Since it is declared as local variables, UI results are not impacted because every time these variables getting updated with declared values.

Actually UI result will be there and it is valid till end of that cycle only. Suppose if we give big delay we can see the difference. And then in next cycle it will go to actual value what we had declared.

[allenmqcymp]

@prabhakarmp thanks! I do realize my mistake now. Closing this thread because the issue was due to my own bug and not CVUI's

[Dovyski]

Thank you for the help, @prabhakarmp! And I am glad @allenmqcymp 's code is working now. All good.