How to use mouse wheel to zoom in and out

I use MapWinGis in delphi
how Can i use Mouse wheel to zoomin and zoomout?

Hello @msi2015

Sorry for the late response.

It should be enabled by default. See the MouseWheelSpeed property. Any value above or below 1 will effectively enable mouse wheel zooming (either in or out).


Hello Jerry Faust
Thank you for your guidance
The problem was solved