Time slider on mobile is innacurate
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When you drag the time slider to, say, 15:00, you may get shown the data for 15:00 or 16:00 depending on exactly how far you slide it. Looks like a basic rounding error to me where the data for the position of the slider is rounded to the nearest hour in two different ways, one for text display on the slider, and two to decide which data to display on the map.
Very easy to reproduce and has existed as long as I can remember using Windy, so I'm not sure why it hasn't been noticed by the developers unless there's something more subtle going on.
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Just want to highlight this bug again. I forgot to say the mobile platform is Android. No idea about iPhone. Tested on two devices. This is a major bug. Windy is fantastic in general.
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@jancellor Hello, could you attach a screenshot of this error? The data are shown for the next hour if it is for example 15:30 pm.
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Sorry for the delay replying. I have attached a screenshot but the bug is very easy to reproduce without. Tested on two phones. Surely wrong every Android phone.
The image shows two screenshots which both say "13:00" on the time slider, but the data shown is different for both. To be clear, the model has not changed, nor anything else besides moving the time slider. The only difference is that the second image has the time slider moved towards the end of the hour.
Basically every time a user looks at a forecast in the future, there's a 50/50 chance the data displayed will be wrong. This is an enormous bug and probably very easy to fix. I would guess that the code for getting the time from the slider is duplicated in two places, one using
round, one usingfloor.
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@jancellor Thank you for the report. Out dev team will take a closer look at it.
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This is a huge bug. It exists on every Android device I've tried. It's very frustrating Windy have completely redesigned the interface but don't fix this very simple error.
@Korina have the dev team looked at this yet?
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@jancellor Hi, I am not able to replicate this, can you provide any more screenshots with this issue from today?
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@Ondřej-Šutera sorry I missed your reply. I have updated my notifications settings to email me so I shouldn't happen again.
I could provided another screenshot but I'm not sure it will help you replicate it. I have been using Windy several times per week for the last few years and this bug has always existed. It happens on every model for every layer for every part of the map. It happens on my phone (Pixel 3a) but also the one other Android phone I have tested it on so far (Oppo Find X5). My timezone is Europe/London in case that matters.
Is it possible that the time slider is doing some calculation based on screen width that is being unreliably calculated? (I know getting window dimenions in a browser/WebView can be error prone.)
What is definitely true is that the logic to determine what time to display on the time slider is not the same logic to determine what time of data to fetch and display on the map. Even if you can't reproduce, I would guess that you would be able to verify this in code.
How can I best help you investigate this further - provide more screenshots or a video, or get a list of more devices that are affected, or something else?
Version is currently 39.3.2.
