private void SetEnvelope()
{
GeoDo.RSS.Core.DF.CoordEnvelope evp = _dataProvider.CoordEnvelope;
switch (_dataProvider.CoordType)
{
case enumCoordType.Raster:
case enumCoordType.PrjCoord:
if (evp == null)
{
evp = new DF.CoordEnvelope(new DF.CoordPoint(0, 0), _dataProvider.Width, _dataProvider.Height);
}
_envelope = new DrawEngine.CoordEnvelope(evp.MinX, evp.MaxX, evp.MinY, evp.MaxY);
if (_dataProvider.SpatialRef != null)
{
_projectionTransform = ProjectionTransformFactory.GetProjectionTransform(SpatialReference.GetDefault(), _dataProvider.SpatialRef);
}
_canvas.CoordTransform.DataCoordType = enumDataCoordType.Prj;
break;
case enumCoordType.GeoCoord:
//这里未处理其他坐标系统//???
_projectionTransform = ProjectionTransformFactory.GetDefault();
double[] xs = new double[] { evp.MinX, evp.MaxX };
double[] ys = new double[] { evp.MinY, evp.MaxY };
_projectionTransform.Transform(xs, ys);
_envelope = new DrawEngine.CoordEnvelope(xs[0], xs[1], ys[0], ys[1]);
_canvas.CoordTransform.DataCoordType = enumDataCoordType.Geo;
break;
}
_originalEnvelope = _envelope.Clone();
_originalResolutionX = (float)(_originalEnvelope.Width / _dataProvider.Width);
_originalResolutionY = (float)(_originalEnvelope.Height / _dataProvider.Height);
//
if (_dataProvider.SpatialRef == null)
{
_canvas.CoordTransform.SpatialRefOfViewer = new SpatialReference(new GeographicCoordSystem());
}
else
{
_canvas.CoordTransform.SpatialRefOfViewer = _dataProvider.SpatialRef.Clone();
}
}
