fine-tune pinch gesture/mouse wheel zoom speed

[n1ru4l]

From Discord:

Alder Agilao: Hi. Zooming on an iPad is incredibly difficult, it zooms and zooms out way to much. Any better way to control? Using an iPad to out to a tv for my group

jeepinbird: I second this. Pinch zooming goes really fast but using the buttons works great.

Relevant code:

dungeon-revealer/src/map-tools/drag-pan-zoom-map-tool.tsx

Line 68 in 3da9d6a

const pinchScale = Math.max(0.1, Math.exp(wheel * 0.5) * scale);

dungeon-revealer/src/map-tools/drag-pan-zoom-map-tool.tsx

Line 91 in 3da9d6a

const pinchScale = Math.max(0.1, Math.exp(wheel * 0.5) * scale);

[maxb2]

The exponential function might be the problem 🙈

[maxb2]

My guess is that the scroll wheel on a mouse changes in small, discrete, and predictable steps, while the pinch gesture can vary a lot. The exponential function will wildly exaggerate whatever wheel is doing.

[n1ru4l]

The wheel variable does have either the value -1 or 1 for both wheel and mouse zoom. There is not really a right speed, only too fast or too slow, so I feel it is a bit of a hard task to figure out the "correct" value, especially since I did not perceive stuff as too fast 😅

[maxb2]

Hmm, maybe the pinch gesture has a higher sample rate than a wheel scroll and that leads to the difference in perceived speeds.