getting the current scale of the ImageItem, or updating the scale of the ImageItem properly

[Denis Vasyukov]

I am writing a GUI for scanning probe microscopy.

I am displaying the images in the ImageItems inside GraphicsLayoutWidget, which also has a PlotItem.

To match the axes of the PlotItem to the images I have to scale them, and it works fine, until I need to

change the scale for a new image.

It seems that a consecutive scale command is like applying the scale with the squared X and Y values.

So, I probably have to restore the scale somehow to the original value, but I cannot read out scale. What are my options?

[Patrick]

Hi,

It's not on the documentation for ImageItem, since it is an indirect descendant of a Qt QGraphicsObject, but all the QGraphicsObject methods also apply to an ImageItem. So you will want to do a img.resetTransform() before applying a new set of scale/translate transforms.

Patrick