Saving more than one Canvas image

[Queenie]

For my project, I'm reading some data via BLE, which then I plot on a canvas. This action can be repeated multiple times as: read data -> plot -> clear graph -> read more data -> plot again

I want to be able to save the images each time I plot the data.

However, whenever I save the graph, it overwrites the one already saved in my phone's storage.

Does anyone know if it's posible to save more than one image?

Thanks in advance!

Update: Changing the filename worked!

[Kaustubh_Rakhade]

Do you use Canvas.Save?
Use Canvas.SaveAs instead and modify the filename each time, like image1.jpg, image2.jpg,...

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Tip:
For unique filename each time, you may join the timestamp with the filename, like image2021_03_04_235959.jgp

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Hope it helps

[Queenie]

Oh, that's good advice! That makes sense.

I was already using Canvas.SaveAs, but the filename was just a text box I created in Blocks. I just asumed that when new files were added, the names would be "filename(1).jpg", "filename(2).jpg," etc.

But I guess it was just overwriting the previous file.

I don't know how to get the timestamp automatically, but I added a text box in the app so the user can name the file. I'll try to see if that works.

Thank you!

[Kaustubh_Rakhade]

Use the Clock.FormatDateTime to create timestamp and join it with thr filename using the Text.Join block.

See how to use the block...

FormatDateTime( instant , pattern )
Converts and formats an instant into a string of date and time with the specified pattern. To learn more about valid patterns, please see SimpleDateFormat. Acceptable patterns are empty string, MM/dd/YYYY HH:mm:ss a , or MMM d, yyyy HH:mm . The empty string will provide the default format, which is "MMM d, yyyy HH:mm:ss a" for FormatDateTime , "MMM d, yyyy" for FormatDate . To see all possible formats, please see here.

Hope it helps