Tolerance for selection

[Jim O'Leary]

I have found the reply from ctallman to be most helpful. Make a small PNG and
use Studio to replace the default circle. Selecting the PNG has much better
success than selecting the default circle.



Farah-2 wrote:
> 
> Hi..
> 
> We can change the tolerance for selecting points as well as showing
> tooltips, by making changes in: ajaxmappane.templ which is in Viewerfiles.
> 
> 
> For tooltips:
> 
> function RequestHyperLinkData(id, x, y, exec)
> {
>     if(lastMapRcv != mapId) return;
>     if(isPopupOpen(tbMenu) || isPopupOpen(ctxMenu)) return;
>     req = CreateRequestHandler();
>     req.open("POST", webAgent, true);
>     req.setRequestHeader("Content-Type",
> "application/x-www-form-urlencoded");
>     //x1 = x - 2; x2 = x + 2; commented by farah (original. changed to
> show
> tooltip)
>    // y1 = y - 2; y2 = y + 2; commented by farah (original)
>       x1 = x - 5; x2 = x + 5;
>       y1 = y - 7; y2 = y + 7;
>     pt1 = ScreenToMapUnits(x1,y1);
>     pt2 = ScreenToMapUnits(x2,y2);
>     geom = MakeWktPolygon(pt1.X, pt1.Y, pt2.X, pt2.Y);
>     reqParams =
> "OPERATION=QUERYMAPFEATURES&VERSION=1.0.0&PERSIST=0&MAPNAME=" +
> encodeURIComponent(mapName) + "&SESSION=" + sessionId + "&SEQ=" +
> Math.random() + "&LAYERNAMES=" + encodeURIComponent(GetVisLayers()) +
> "&GEOMETRY=" + geom + "&SELECTIONVARIANT=INTERSECTS&MAXFEATURES=1";
>     obj = new HlRequest(id, x, y, req, exec);
>     req.onreadystatechange = obj.OnHl;
>     try { req.send(reqParams); } catch(e) {}
> }
> 
> 
> For point selection:
> In the method: ExecuteRectangleTool
> 
> else if(tool == 0)
>     {
>         if((x2 - x1 <= 2) && (y2 - y1 <= 2))
>         {
>             x1 -= 2; y1 -= 2;
>            // x2 = x1 + 4; y2 = y1 + 4;commented by farah (original)
>            x2 = x1 + 8; y2 = y1 + 8;
>             pt1 = ScreenToMapUnits(x1, y1);
>             pt2 = ScreenToMapUnits(x2, y2);
>             RequestPointSelection(pt1.X, pt1.Y, pt2.X, pt2.Y, appending);
>         }
> 
> 
> Regards
> Farah
> 
> -----Original Message-----
> From: Jim O'Leary [mailto:joleary.public at gmail.com] 
> Sent: Thursday, October 12, 2006 11:37 PM
> To: users at mapguide.osgeo.org
> Subject: [mapguide-users] Tolerance for selection
> 
> 
> Can you change the tolerance for selecting points? The Select tool doesn't
> always select a point. Any tips for making this tool work better?
> 
> Thanks
> -- 
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> 
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