I had the same idea, but the thing is I'd like to use vector features :
I have OL Rules to change the color according to some attributes.
Actually, I'd like to have this kind of result :
http://blog.fleetmon.com/wp-content/uploads/2012/07/FleetMon-Explorer-live-real-time-vessel-tracking-and-monitoring-Fleetmon.com-125-2-1024x581.jpg
But with the line at the top of the triangle (direction and speed, and
not passed trajectory).
Le 27/07/2012 17:08, Mr. Puneet Kishor a écrit :
On Jul 27, 2012, at 10:18 AM, Gabriel Vatin <[email protected]>
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 ?
The above is too complicated. Instead, make one image of an arrow (line with
triangle showing direction), and then rotate and scale it as needed. See
example image at http://dl.dropbox.com/u/3526821/gps.png
--
Puneet Kishor
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