[OpenLayers-Users] mousewheel: center on point or not?

[Bart van den Eijnden (OSGIS)]

Hi list,

I thought the mousewheel used to center on the mouse cursor, but it does not
do this anymore in trunk. Or maybe my mind is playing tricks on me :-)

Questions:
-is this intentional?
-if so, could it not become a property of the Navigation Control so people
can control this behaviour themselves?

I commented the following in Navigation.js (deltaX * newRes etc.) to get it
to zoom centered on the mouse position again:

    wheelChange: function(evt, deltaZ) {
        var newZoom = this.map.getZoom() + deltaZ;
        if (!this.map.isValidZoomLevel(newZoom)) {
            return;
        }
        var size    = this.map.getSize();
        var deltaX  = size.w/2 - evt.xy.x;
        var deltaY  = evt.xy.y - size.h/2;
        var newRes  = this.map.baseLayer.getResolutionForZoom(newZoom);
        var zoomPoint = this.map.getLonLatFromPixel(evt.xy);
        var newCenter = new OpenLayers.LonLat(
                            zoomPoint.lon /*+ deltaX * newRes*/,
                            zoomPoint.lat /*+ deltaY * newRes*/ );
        this.map.setCenter( newCenter, newZoom );
    },

Best regards,
Bart

--
Bart van den Eijnden
OSGIS, Open Source GIS
http://www.osgis.nl