[OpenLayers-Users] Point symbolizer: triangle + orientation line

[Alexandre Dubé]

Hi Gabriel,

   You could try to define your own arrow symbol.  There's one defined 
[here], see line 1 :

OpenLayers.Renderer.symbol.arrow = [0,2, 1,0, 2,2, 1,0, 0,2]

   I haven't tried it, but it could do the trick.

HTH,

Alexandre

[here] 
http://code.google.com/p/rep-olnet/source/browse/trunk/Direction.js?r=61


On 12-07-27 10:18 AM, Gabriel Vatin wrote:
> Hello,
>
> I'd like to represent mobile objects (WFS layer of points) with a 
> triangle, and a line to show the direction and speed of it. Right now, 
> I can use the default "triangle" symbolizer :
>
> symbolizer: {
> rotation: '${heading}',
>     pointRadius: 6.5,
>     graphicName: 'triangle',
>     strokeColor: 'white',
>     fillColor: color,
>     strokeOpacity: 0.3,
>     strokeWidth: 2,
>     fillOpacity: 0.7
> }
>
> Then I use the rotation attribute to turn the trangle. The triangle 
> object is a isosceles triangle, but it is so small that we can't 
> really see its orientation. So is there a method to draw a triangle 
> and a line at the top of it to show the direction ?
> I just tried to add a new WFS layer with the same origin, but an other 
> symbolizer :
>
> defaultStyleD = new OpenLayers.Style({
>     rotation: '${heading}',
>     pointRadius: 25,
>     externalGraphic: './img/line.png',
>     graphicYOffset: -50
> });
>
> The line.png is an image I made myself. If I display the 2 layers at 
> the same time, that's the kind of result that I want to see... but 
> this is only a trick, and not a real good way to answer my problem !
> Do you have any idea ?
>
> Thanks,
>
> Gabriel
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-- 
Alexandre Dubé
Mapgears
www.mapgears.com