[OpenLayers-Users] selecting marker potential bug
Hi, I think I have found a bug. See attached file for a simple test case. When you click on one of the points (features) a popup will display. Since the feature is selected, it's style changes and it turns blue. This is unexpected. I would have expected it to keep the default style, that is, for it not to change in appearance. Is this the desired behavior. To prevent the appearance change, you can change line 71 to: default: style, select: style Please let me know if this is a bug or not. Also, it may be related to this bug http://trac.openlayers.org/ticket/ 1498. Thanks, Chris Title: OpenLayers Cluster Strategy Threshold Cluster Strategy Threshold Demonstrates the use of the cluster strategy threshold property. The Cluster strategy lets you display points representing clusters of features within some pixel distance. You can control the behavior of the cluster strategy by setting its distance and threshold properties. The distance determines the search radius (in pixels) for features to cluster. The threshold determines the minimum number of features to be considered a cluster. Cluster details: hover over a feature to see details. distance threshold recluster ___ Users mailing list Users@openlayers.org http://openlayers.org/mailman/listinfo/users
Re: [OpenLayers-Users] selecting marker potential bug
On Fri, Jun 12, 2009 at 02:19:37PM -0400, Chris Abraham wrote:
Hi,
I think I have found a bug. See attached file for a simple test case.
When you click on one of the points (features) a popup will display.
Since the feature is selected, it's style changes and it turns blue.
This is unexpected. I would have expected it to keep the default
style, that is, for it not to change in appearance. Is this the
desired behavior. To prevent the appearance change, you can change
line 71 to:
default: style, select: style
Please let me know if this is a bug or not.
This is documented behavior.
http://docs.openlayers.org/library/feature_styling.html
The âdefaultâ intent has a special role: if the extendDefault
property of the StyleMap is set to true (default), symbolizers
calculated for other render intents will extend the symbolizer
calcualated for the âdefaultâ intent. So if we want selected
features just to have a different size or color, we only have to set a
single property (in this example: pointRadius).
Basically:
* If you want things to always look the same, pass a symbolizer
directly into the StyleMap, not into default.
* if you want to control the style when something is selected,
pass in a 'select' param to the hash
* If you are fine with the default selcetion style when applied
to your 'default' rules, then just pass in default.
-- Chris
Also, it may be related to this bug http://trac.openlayers.org/ticket/
1498.
Thanks,
Chris
html xmlns=http://www.w3.org/1999/xhtml;
head
titleOpenLayers Cluster Strategy Threshold/title
link rel=stylesheet href=../theme/default/style.css
type=text/css /
link rel=stylesheet href=style.css type=text/css /
style type=text/css
ul {
list-style: none;
padding-left: 2em;
}
#reset {
margin-left: 2em;
}
/style
script
src=http://openlayers.org/api/2.8-rc5/OpenLayers.js;/script
script type=text/javascript
// create a semi-random grid of features to be clustered
var dx = 3;
var dy = 3;
var px, py;
var features = [];
for(var x=-45; x=45; x+=dx) {
for(var y=-22.5; y=22.5; y+=dy) {
px = x + (2 * dx * (Math.random() - 0.5));
py = y + (2 * dy * (Math.random() - 0.5));
features.push(new OpenLayers.Feature.Vector(
new OpenLayers.Geometry.Point(px, py), {x: px, y: py}
));
}
}
var map, strategy, clusters;
function init() {
map = new OpenLayers.Map('map');
var base = new OpenLayers.Layer.WMS(OpenLayers WMS,
[http://t3.labs.metacarta.com/wms-c/Basic.py;,
http://t2.labs.metacarta.com/wms-c/Basic.py;,
http://t1.labs.metacarta.com/wms-c/Basic.py;],
{layers: 'satellite'}
);
var style = new OpenLayers.Style({
pointRadius: ${radius},
fillColor: #ffcc66,
fillOpacity: 0.8,
strokeColor: #cc6633,
strokeWidth: ${width},
strokeOpacity: 0.8
}, {
context: {
width: function(feature) {
return (feature.cluster) ? 2 : 1;
},
radius: function(feature) {
var pix = 2;
if(feature.cluster) {
pix = Math.min(feature.attributes.count, 7) +
2;
}
return pix;
}
}
});
strategy = new OpenLayers.Strategy.Cluster();
clusters = new OpenLayers.Layer.Vector(Clusters, {
strategies: [strategy],
styleMap: new OpenLayers.StyleMap({
default: style
})
});
function onSelectFeature(feature) {
var popup = new OpenLayers.Popup.FramedCloud(null,
feature.geometry.getBounds().getCenterLonLat(),
null, 'hi',
{size: new
OpenLayers.Size(1, 1), offset: new OpenLayers.Pixel(1,-2)},
true, function() {
selectControl.unselect(feature); });
feature.popup = popup
map.addPopup(popup);
}
var select = new
Re: [OpenLayers-Users] selecting marker potential bug
Alternatively, you can replace lines 69-71 with: styleMap: new OpenLayers.StyleMap( style ) I assume here that since I didn't specify default this style gets set to all options. Chris On Jun 12, 2009, at 2:19 PM, Chris Abraham wrote: Hi, I think I have found a bug. See attached file for a simple test case. When you click on one of the points (features) a popup will display. Since the feature is selected, it's style changes and it turns blue. This is unexpected. I would have expected it to keep the default style, that is, for it not to change in appearance. Is this the desired behavior. To prevent the appearance change, you can change line 71 to: default: style, select: style Please let me know if this is a bug or not. Also, it may be related to this bug http://trac.openlayers.org/ ticket/1498. Thanks, Chris clusteringbug.html___ Users mailing list Users@openlayers.org http://openlayers.org/mailman/listinfo/users ___ Users mailing list Users@openlayers.org http://openlayers.org/mailman/listinfo/users
Re: [OpenLayers-Users] selecting marker potential bug
Great. Makes sense. Thanks.
Chris
On Jun 12, 2009, at 2:47 PM, Christopher Schmidt wrote:
On Fri, Jun 12, 2009 at 02:19:37PM -0400, Chris Abraham wrote:
Hi,
I think I have found a bug. See attached file for a simple test
case.
When you click on one of the points (features) a popup will display.
Since the feature is selected, it's style changes and it turns blue.
This is unexpected. I would have expected it to keep the default
style, that is, for it not to change in appearance. Is this the
desired behavior. To prevent the appearance change, you can change
line 71 to:
default: style, select: style
Please let me know if this is a bug or not.
This is documented behavior.
http://docs.openlayers.org/library/feature_styling.html
The “default” intent has a special role: if the extendDefault
property of the StyleMap is set to true (default), symbolizers
calculated for other render intents will extend the symbolizer
calcualated for the “default” intent. So if we want selected
features just to have a different size or color, we only have to set a
single property (in this example: pointRadius).
Basically:
* If you want things to always look the same, pass a symbolizer
directly into the StyleMap, not into default.
* if you want to control the style when something is selected,
pass in a 'select' param to the hash
* If you are fine with the default selcetion style when applied
to your 'default' rules, then just pass in default.
-- Chris
Also, it may be related to this bug http://trac.openlayers.org/
ticket/
1498.
Thanks,
Chris
html xmlns=http://www.w3.org/1999/xhtml;
head
titleOpenLayers Cluster Strategy Threshold/title
link rel=stylesheet href=../theme/default/style.css
type=text/css /
link rel=stylesheet href=style.css type=text/css /
style type=text/css
ul {
list-style: none;
padding-left: 2em;
}
#reset {
margin-left: 2em;
}
/style
script src=http://openlayers.org/api/2.8-rc5/
OpenLayers.js/script
script type=text/javascript
// create a semi-random grid of features to be clustered
var dx = 3;
var dy = 3;
var px, py;
var features = [];
for(var x=-45; x=45; x+=dx) {
for(var y=-22.5; y=22.5; y+=dy) {
px = x + (2 * dx * (Math.random() - 0.5));
py = y + (2 * dy * (Math.random() - 0.5));
features.push(new OpenLayers.Feature.Vector(
new OpenLayers.Geometry.Point(px, py), {x:
px, y: py}
));
}
}
var map, strategy, clusters;
function init() {
map = new OpenLayers.Map('map');
var base = new OpenLayers.Layer.WMS(OpenLayers WMS,
[http://t3.labs.metacarta.com/wms-c/Basic.py;,
http://t2.labs.metacarta.com/wms-c/Basic.py;,
http://t1.labs.metacarta.com/wms-c/Basic.py;],
{layers: 'satellite'}
);
var style = new OpenLayers.Style({
pointRadius: ${radius},
fillColor: #ffcc66,
fillOpacity: 0.8,
strokeColor: #cc6633,
strokeWidth: ${width},
strokeOpacity: 0.8
}, {
context: {
width: function(feature) {
return (feature.cluster) ? 2 : 1;
},
radius: function(feature) {
var pix = 2;
if(feature.cluster) {
pix = Math.min
(feature.attributes.count, 7) + 2;
}
return pix;
}
}
});
strategy = new OpenLayers.Strategy.Cluster();
clusters = new OpenLayers.Layer.Vector(Clusters, {
strategies: [strategy],
styleMap: new OpenLayers.StyleMap({
default: style
})
});
function onSelectFeature(feature) {
var popup = new OpenLayers.Popup.FramedCloud(null,
feature.geometry.getBounds().getCenterLonLat(),
null, 'hi',
{size: new
OpenLayers.Size(1, 1), offset: new OpenLayers.Pixel(1,-2)},
true, function
() { selectControl.unselect(feature); });
feature.popup = popup
map.addPopup(popup);
}
