[OpenLayers-Users] Re: OpenLayers.Control.ScaleLine : Add a coefficient

[mickal]

I really would like that it was simple !

But it's not, the map is come from a dxf file ( dxf2shp with qgis ).

So the scale is not respected.

Thx,

On Thu, Mar 24, 2011 at 10:35 PM, Andreas Hocevar-2 [via OSGeo.org] <
ml-node+6205740-1095475097-182549 at n2.nabble.com> wrote:

> I think your map and/or layer configuration must be wrong. Usually this
> kind of problem appears when your map units don't match the projection's
> distance units.
>
> I'd say there is no need to introduce a coefficient. Check your projection,
> and configure the map or base layer with the according units.
>
> Regards,
> Andreas.
>
> On Mar 24, 2011, at 19:03 , Micka wrote:
>
> > Hey,
> >
> >
> > Well, I've gotten the source code of this module, so now i'm trying to
> add a coeficient K .
> >
> >
> > The goal is to give the possibility to adjust the scaleline.
> >
> > For that, I thought that we can add two function on this module :
> >
> > • float calculateTheCoefficient(float length, int pixels );      //
> length in meter , pixels number of pixels that the length represent
> > • void setTheCoefficient ( float k );
> >
> > The first function will calculate the coefficient with the actual
> resolution and the length/pixels .
> > the second function will save the coefficient for the update function() .
>
> >
> >
> > What do you think ?
> >
> >
> > My problem, is that i don't know how to do code the first function
> .......
> >
> >
> >
> >
> >
> >
> >    update: function() {
> >         var res = this.map.getResolution();
> >         res*= k;
> >         if (!res) {
> >             return;
> >         }
> >
> >         // convert maxWidth to map units
> >             var maxSizeData = this.maxWidth * res;
> >
> >         // decide whether to use large or small scale units
> >             var topUnits;
> >             if(maxSizeData > 0.1) {
> >               topUnits = this.topOutUnits;
> >             } else {
> >               topUnits = this.topInUnits;
> >             }
> >
> >         // and to map units units
> >             var curMapUnits = this.map.units;
> >             var inches = OpenLayers.INCHES_PER_UNIT;
> >             var topMax = maxSizeData * inches[curMapUnits] /
> inches[topUnits];
> >
> >             // now trim this down to useful block length
> >             var topRounded = this.getBarLen(topMax);
> >
> >             // and back to display units
> >             topMax = topRounded / inches[curMapUnits] * inches[topUnits];
>
> >
> >             // and to pixel units
> >             var topPx = topMax / res;
> >
> >             // now set the pixel widths
> >             this.eTop.style.width = Math.round(topPx) + "px";
> >
> >             // and the values inside them
> >             this.eTop.innerHTML = topRounded + " " + topUnits;
> >         },
> >
> >         CLASS_NAME: "OpenLayers.Control.ScaleLine"
> >     }
> >
> >
> >
> >
> >
> > On Thu, Mar 24, 2011 at 3:03 PM, mickal <[hidden email]<http://user/SendEmail.jtp?type=node&node=6205740&i=0&by-user=t>>
> wrote:
> > Hi,
> >
> > The scale that the module displayed to me is not right, I mean :
> >
> > 50 pixel => 1000km
> > but in reality :
> > 50 pixel => 100 m
> >
> > is it possible to add a coefficient to this module ?  to adjust the scale
>
> > that it displayed.
> >
> >
> > Because otherwise I have to change my map, and this process is very long.
>
> >
> >
> > thx,
> >
> > --
> > View this message in context:
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> --
> Andreas Hocevar
> OpenGeo - http://opengeo.org/
> Expert service straight from the developers.
>
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