pyqtgraph ViewBox(0.9.9) setLimit do not keep the aspect locked:

[Manish]

Hi Luke,

 

I have to prevent zoom out and panning in the Viewbox under following circumstances.

1. There should not be any zooming out.

2. Aspect ratio should be locked to 1:1.

3. viewbox height and width can change.

 

I replaced the Viewbox 0.9.8 with Viewbox 0.9.9 in my sitepackage to check wheather it works properly or not. I set the limits after wihich zooming out should be disabled as the original x and y limit.

But when the the width of the viewbox is changed keeping the height constant then the aspect ratio of the graph change. I think since the x range does not change resizing when the height is fixed, hence the aspect ratio is not maintained as 1:1.

 

Please provide your views and idea to solve this problem.

 

Thanks

[Luke Campagnola]

Hi Manish,

There is currently a bug in ViewBox that causes the view limits to override the aspect ratio. I hope to have this fixed soon.

However: If you want to disable zooming entirely, then the best way to do this is with ViewBox.setMouseEnabled(x=False, y=False). You should find that this does interact correctly with the aspect ratio constraint, even when resizing the window.

Luke

[Manish]

Thanks for your reply Luke.

I have to disable zoom in and zoom out after a certain limit at the same time aspect ratio needs to locked. I have tried couple of things on resize event like storing viewbox target range on resize event and setting that as the original  x-y range and comparing a percentage of that on rangeChanged event. It works for some of the cases but fails when i resize the window under zoomed in state.

[Manu]

Hi, this issue is still present. When using setLimits on a viewBox (contains an image in my case), the aspect ration is not conserved, which is very annoying. Or is there something I'm missing?

[Israel Brewster]

I submitted a pull request with a fix for this some time ago, but unfortunately it has not been reviewed or merged as of yet. Hopefully soon. 

Sent from my iPhone

On Feb 11, 2020, at 6:42 AM, Manu <emmanue...@gmail.com> wrote:



Hi, this issue is still present. When using setLimits on a viewBox (contains an image in my case), the aspect ration is not conserved, which is very annoying. Or is there something I'm missing?

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[Manu]

Thanks for the info! Have a good evening

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