Distance from Polygon sometime 0 when not touching

[filcius]

It may be my understanding, but I think distance should not be 0 here. But it is.

var shape1 = new OpenLayers.Geometry.Polygon([new OpenLayers.Geometry.LinearRing([new OpenLayers.Geometry.Point(-5, -5), new OpenLayers.Geometry.Point(-5, 5),new OpenLayers.Geometry.Point(0, 5),new OpenLayers.Geometry.Point(0, -5)])]) var shape2 = new OpenLayers.Geometry.Polygon([new OpenLayers.Geometry.LinearRing([new OpenLayers.Geometry.Point(2, 5), new OpenLayers.Geometry.Point(5, 5),new OpenLayers.Geometry.Point(5, -5),new OpenLayers.Geometry.Point(1, -5)])])

var distance = shape1.distanceTo(shape2, {details:false, edge:false})