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Learn more about Teams arrow->setPen(pen); arrow->setHead(QCPLLineEnding::esLineArrow); arrow->setHead(QCPLLineEnding::esDisc);

in this situation i'm playing the program, i resize the window and i see an arrow on the plot with coordinates (0,0) and (1,1). this is the code I didnt use replot! I didnt use start! I didnt use end!

in addition, when i will understand what is the problem I'm asking what is the correct way to draw a line when i'm trying to draw above other graph.

normally if I'm using points it will be like:

QVector<double> x;
QVector<double> y;
ui->grid->graph(number)->setData(x,y);
ui->grid->graph(number)->replot();
but I cant do setData with a line and its not related to some graph so i can i Draw the line on a specefic graph??
                ok. in MainWindow i have QCustomPlot* grid. i want to make a function with x_start, y_start, x_end, y_end and draw an arrow accordingly
– asaf anter
                Jul 29, 2018 at 8:53
                If you do not explain clearly what you want and provide a decent minimal reproducible example unfortunately I can not help you :)
– eyllanesc
                Jul 29, 2018 at 9:26
QCPItemLine is drawn automatically without replot, if you want it not to be displayed you must use:
setVisible(False);
If you want it to be displayed use:
setVisible(True);
ui->grid->replot();
                yes but before i'm using start and end,  its is being plotted without it from (0,0) to (1,1). try to init the line like i did, play the program and change the window size, the line should appear from nowhere without using start and end. in addition iwant it to be on other graph, but i cant related the line to a graph
– asaf anter
                Jul 29, 2018 at 9:20
        
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