Discuss and choose the good zoom factor for the client

[IbrahimFradj]

We need to discuss the zoom factor in the xy charts and time graph charts and make a decision on which factor to choose. After testing zooming out in the time graph charts, I noticed that at some point the zoom factor would change abruptly and I would get lost. In the time graph charts, we use "const zoomMagnitude = hasZoomedIn ? 0.8 : 1.25 ;" but in the xy charts, we use a 10% change every time we zoom in or out.

Here is the result with the time graph charts

You can notice that at the beginning when I zoom in or out the zoom factor was constant but just when I get to the extreme right and zoom out again the factor changes completely and it zooms out much more than it did at first Here is the images

ER = extreme right

Here is the result with XY charts

We can notice with the xy charts that the zoom in and zoom out are constant depending on the mouse position

[ebugden]

What was the reason for having the zoom factor become larger when the beginning or the end of the trace is in view?

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I'd like to hear @ssmagula's thoughts as well!

My quick thoughts (caveat: as a designer not a user) are that predictability and consistent feel should be the priority for navigation:

• Predictable zooming behaviour within a chart. Ex. One scroll is always 10% change (regardless of whether close to edge)
• Consistent zooming feel between chart types. It doesn't actually have to be the same percentage (maybe bigger changes are appropriate for certain chart types) as long as it feels consistent.