[OpenLayers-Users] externalGraphic anchoring points?

[Arnd Wippermann]

I have always thought the anchorpoint is left-top. But your nice example
suggest it's the center of the externalGraphic.

Looking at the code, it seems to be a bit complexer. 

SVG.js, similiar for VML.js
var xOffset = (style.graphicXOffset != undefined) ? style.graphicXOffset :
-(0.5 * width);
var yOffset = (style.graphicYOffset != undefined) ? style.graphicYOffset :
-(0.5 * height);

If you declare the properties graphicXOffset and graphicYOffset in your
style, then these values are taken for drawing. If you omit these
properties, then an offset of half the width or height are taken.

Because I use always the properties graphicXOffset=0 and graphicYOffset=0 in
conjunction with externalGraphic, I have the anchorpoint always at left-top.
 
If you want to use an offset to move the image, then you have to calculate
from left-top and not from the center as your example seems to show.

Arnd


-----Ursprüngliche Nachricht-----
Von: users-bounces at openlayers.org [mailto:users-bounces at openlayers.org] Im
Auftrag von MostlyBaldEagle
Gesendet: Dienstag, 27. Juli 2010 20:03
An: users at openlayers.org
Betreff: Re: [OpenLayers-Users] externalGraphic anchoring points?


It's the center of the image.

Easy to see if you connect two images with a line :-)

Make sure the line feature is added to the layer before the two images(point
features), then the line will usually show up on top.

See example:

http://osgeo-org.1803224.n2.nabble.com/file/n5343347/test_2_8.htm
test_2_8.htm
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