[OpenLayers-Users] Feature dot disappears after moving it a few times

[Vasco Correia]

Hi,

I'm trying to move a point on a vector layer by changing its location every
few seconds and redrawing the layer. This works for a few times, but then
the dot disappears - it's not off the map (it's only going around a few
blocks) and even the getVisibility() and onScreen() return true - it just
doesn't show on screen. Sometimes it will reappear after being invisible
for a few position "jumps". Zoom level seems to affect the behavior - the
dot disappears more easily if I zoom in very close.

I've added zIndex:9999 to the StyleMap, but that didn't change the behavior.

Basically I have a "feature_point" variable (OpenLayers.Geometry.Point) and
this is how I change it's place ("position" comes from an array of
coordinates, should eventually be real location data from a device)

feature_point.geometry.x = position.lon;
feature_point.geometry.y = position.lat;
vector_layer.redraw();

This is run in a function called by setInterval()
Why does it disappear?
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