[OpenLayers-Users] Measure Control - get distance on mouse move
- part 2
Josh Rosenthal
maric423 at gmail.com
Thu Apr 30 11:20:09 EDT 2009
Hi Andreas,
Sorry to bring this question back from the dead, but unless I'm missing
something obvious, the sketchmodified event / modify callback aren't
triggered from Handler.RegularPolygon. This makes some sense, as they're
supposed to take the modified vertex, and in the RegularPolygon, all
vertices are modified, but it leaves us without a way of listening for the
modification of a RegularPolygon.
As such, unless anyone can recommend another solution, I think I'm back to
passing a customized modifyGeometry in order . Am I misunderstanding how to
listen for this event? Any other suggestions?
Thanks,
Josh
On Wed, Apr 22, 2009 at 4:35 PM, Andreas Hocevar <ahocevar at opengeo.org>wrote:
> Josh Rosenthal wrote:
>
>> Thanks a lot for the solution using callbacks. I was wondering if you
>> could suggest how that might be adapted to give the measurements on a draw
>> feature. It's much easier than what I was previously doing for measure and
>> drawFeature (passing a customized modifyFeature function in the options,
>> where the new function was the same as the original, but also had the
>> requisite getLength statements - functional, but it seems like this should
>> be far more version dependent than the callback solution).
>>
>> When I try to use callbacks-modify on a drawFeature (as below), my modify
>> callback doesn't seem to get used (the console.log(this) never fires). I
>> assume this is because measureControls didn't already use a modify callback,
>> whereas drawFeature does, and as such drawFeature overrides any modify
>> callback I might try to pass in? Is there any way to append to the normal
>> modify callback? Am I missing something obvious?
>>
>
> The best way to achieve this would be to listen for the sketchmodified
> event of the DrawFeature control. this is what actually gets triggered in
> the modify callback of the handler that is configured with DrawFeature.
>
> Regards,
> Andreas.
>
>
>> Thanks!
>> Josh
>>
>> broken: uses callbacks - modify: selectDrawCircle = new
>> OpenLayers.Control.DrawFeature(selectLayerPoly,
>> OpenLayers.Handler.RegularPolygon,{
>> displayClass:"olControlSelectDrawCircle",
>>
>> element:document.getElementById('SelectControl_Distance'),
>>
>> unitElement:document.getElementById('SelectControl_mapUnit'),
>> callbacks:{
>> modify: function (point,feature) {
>> console.log(this);
>>
>> this.element.value=this.radius.toFixed(2);
>>
>> this.unitElement.innerHTML=this.map.getUnits();
>> }
>> },
>> handlerOptions:{
>> sides:40
>> }
>> });
>> functional: uses slightly customized
>> modifyGeometry function passed in as an option
>> selectDrawCircle = new
>> OpenLayers.Control.DrawFeature(selectLayerPoly,
>> OpenLayers.Handler.RegularPolygon,{
>> displayClass:"olControlSelectDrawCircle",
>> handlerOptions:{
>> sides:40,
>>
>> element:document.getElementById('SelectControl_Distance'),
>>
>> unitElement:document.getElementById('SelectControl_mapUnit'),
>> modifyGeometry: function() {
>> var angle, dx, dy, point;
>> var ring =
>> this.feature.geometry.components[0];
>> // if the number of sides ever changes,
>> create a new geometry
>> if(ring.components.length !=
>> (this.sides + 1)) {
>> this.createGeometry();
>> ring =
>> this.feature.geometry.components[0];
>> }
>> for(var i=0; i<this.sides; ++i) {
>> point = ring.components[i];
>> angle = this.angle + (i * 2 *
>> Math.PI / this.sides);
>> point.x = this.origin.x +
>> (this.radius * Math.cos(angle));
>> point.y = this.origin.y +
>> (this.radius * Math.sin(angle));
>> point.clearBounds();
>> }
>> // note, only val b/c this is an input
>> field.
>>
>> this.element.value=this.radius.toFixed(2);
>>
>> this.unitElement.innerHTML=this.map.getUnits();
>> }
>> }});
>>
>>
>> On Wed, Apr 22, 2009 at 8:22 AM, Andreas Hocevar <ahocevar at opengeo.org<mailto:
>> ahocevar at opengeo.org>> wrote:
>>
>> Hi,
>>
>> the solution (if you're using trunk or 2.8) is quite simple. The
>> snippet
>> below replaces the definition of measureControls in the measure example
>> (starting around L65)
>>
>> measureControls = {
>> line: new OpenLayers.Control.Measure(
>> OpenLayers.Handler.Path, {
>> callbacks: {
>> modify: function(point, feature) {
>>
>> measureControls.line.measurePartial(point,
>> feature.geometry);
>> }
>> },
>> persist: true,
>> handlerOptions: {
>> layerOptions: {styleMap: styleMap}
>> }
>> }
>> ),
>> polygon: new OpenLayers.Control.Measure(
>> OpenLayers.Handler.Polygon, {
>> callbacks: {
>> modify: function(point, feature) {
>>
>> measureControls.polygon.measurePartial(point,
>> feature.geometry);
>> }
>> },
>> persist: true,
>> handlerOptions: {
>> layerOptions: {styleMap: styleMap}
>> }
>> }
>> )
>> };
>>
>> As you can see, the trick is to add a modify callback to the handler,
>> calling the control's measurePartial method.
>>
>> Regards,
>> Andreas.
>>
>> pribram pribram wrote:
>> > Hi,
>> > Is there anything new about measuring + getting distance on
>> mousemove?
>> >
>>
>> http://n2.nabble.com/Measure-Control---get-distance-on-mouse-move-td2503580.html
>> > If there is a solution, please publish it.
>> >
>> > Thanks,
>> > Pribram
>> > _______________________________________________
>> > Users mailing list
>> > Users at openlayers.org <mailto:Users at openlayers.org>
>> > http://openlayers.org/mailman/listinfo/users
>> >
>>
>>
>> --
>> Andreas Hocevar
>> OpenGeo - http://opengeo.org/
>> Expert service straight from the developers.
>>
>> _______________________________________________
>> Users mailing list
>> Users at openlayers.org <mailto:Users at openlayers.org>
>> http://openlayers.org/mailman/listinfo/users
>>
>>
>>
>
> --
> Andreas Hocevar
> OpenGeo - http://opengeo.org/
> Expert service straight from the developers.
>
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