public void PrepareFilter(IFeatureClass fc, IQueryFilter queryFilter)
{
// prepare filter for drawing
// must add OID
queryFilter.AddField(fc.OIDFieldName);
m_ShapeType = fc.ShapeType;
if (m_ShapeType == esriGeometryType.esriGeometryPoint)
{
if (m_sRotationField != null)
{
if (m_sRotationField != "")
{
queryFilter.AddField(m_sRotationField);
}
}
}
// save the fc and the query filter so that multiple cursors can be built in DrawSymbols
m_pFeatureClass = fc;
m_pQueryFilter = queryFilter;
// prepare filters on constituent renderers so I can use SymbolByFeature in Draw
if (m_pShapePatternRend != null)
m_pShapePatternRend.PrepareFilter(fc, queryFilter);
if (m_pColorRend1 != null)
m_pColorRend1.PrepareFilter(fc, queryFilter);
if (m_pColorRend2 != null)
m_pColorRend2.PrepareFilter(fc, queryFilter);
if (m_pSizeRend != null)
m_pSizeRend.PrepareFilter(fc, queryFilter);
// if we're combining colors from two (sequential) quantitative schemes, build color matrix now
// this gives flexibility to extend in future
// in current impl. we determine combined color based on two colors, one from each constituent
// ClassBreaksRenderer. so, we could determine color on demand when drawing. but, by creating
// the color matrix here and storing for later use, we leave open the possibility of swapping in
// different logic for determining combined colors based on all known colors in each constituent
// renderer, not just the colors for the given feature
if ((m_pColorRend1 != null) & (m_pColorRend2 != null))
{
if (! (m_eColorCombinationMethod == EColorCombinationType.enuComponents))
BuildColorMatrix();
}
//implementation of IExportSupport
AddExportFields(fc, queryFilter);
}