Interface IWheelOptions

Axis to zoom

Place this point at center during zoom instead of current mouse position

Stop smoothing with any user input on the viewport

Array containing KeyboardEvent.code values of keys that can be pressed for the zoom to be triggered, e.g.: ['ShiftLeft', 'ShiftRight'}.

Scaling factor for non-DOM_DELTA_PIXEL scrolling events

Adjusts the zoom speed. Despite its name, this is not the percent zoomed per spin.

Each wheel event multiplies the scale by 2 ^ ((1 + percent) * -deltaY / 500) (or 2 ^ ((1 + percent) * trackpadPinchSpeed * -deltaY / 200) for a trackpad pinch with trackpadPinch on). For a typical mouse wheel notch (deltaY = 100) this zooms by about:

• -0.5 → 7%
• 0 → 15%
• 0.1 (default) → 16.5%
• 0.5 → 23%
• 1 → 32%

Use a negative value to zoom slower than the default. -1 stops zooming and values below -1 reverse it. deltaY varies by browser, OS, and device, so the actual amount per notch varies too.

Reverse the direction of the scroll

smooth the zooming by providing the number of frames to zoom between wheel spins

Pinch the trackpad to zoom. Browsers send a trackpad pinch as wheel events with ctrlKey set; with this on, those events zoom using trackpadPinchSpeed (and zoom even when wheelZoom is false).

Multiplies the zoom speed of a trackpad pinch (only used when trackpadPinch is on). Unlike percent, it doesn't change mouse wheel zooming.

A pinch arrives as many wheel events with small deltas (deltaY around 2 to 10). At 1, an event with deltaY = 5 zooms by about 2%; at 2.5, about 5%, which is close to how map apps feel.

zooms on wheel spin (use this as an alternative to drag.options.wheel)