Counter

cvui::counter() renders a counter for integer (or double) values that users can increase/decrease by clicking up and down arrows. The signature of the functions are:

int counter (
    cv::Mat& theWhere,
    int theX,
    int theY,
    int *theValue,
    int theStep = 1,
    const char *theFormat = "%d"
)

double counter (
    cv::Mat& theWhere,
    int theX,
    int theY,
    double *theValue,
    double theStep = 0.5,
    const char *theFormat = "%.2f"
)

where theWhere is the image/frame where the image will be rendered, theX is the position X, theY is the position Y, theValue is the current value of the counter, theStep is the amount that should be increased/decreased when the user interacts with the counter buttons, and theFormat is how the value of the counter should be presented, as it was printed by stdio's printf(). E.g. "%d" means the value will be displayed as an integer, "%0d" integer with one leading zero, etc.

cvui::counter() returns a number that corresponds to the current value of the counter.

Below is an example showing a counter. The result on the screen is shown in Figure 1.

int count = 2;
cvui::counter(frame, 90, 50, &count);

Figure 1: counter component.

Learn more

Check the main-app example for more information about counter.