Fixed width line in QImage

[CJha]

Hi! I am trying to create line plots using QImage. This plot is meant to be resizable in both width and height. The plotline I draw is usually 1 pixel wide, and each plotline consists of data points in tens of thousands and there are tens of plotlines in one QImage. When I resize, recalculating and redrawing the entire QImage takes a lot of time and so I am trying to just scale the QImage using scaled() function according to my requirements, this is very fast. However, if the height of QImage is small enough the line plots disappear, is there any way I can make sure that the plot lines have a fixed width no matter the size of QImage?