private short GetHeightByRectBoundAssist(int indexInRect, GeoCalcBound geoCalcBound, DemDataType demDataType, int layerIndex)
{
if ((!geoCalcBound.Equals(this.m_geoHeightCalcBound) || (this.m_HeightlayerIndex != layerIndex)) || (this.m_HeightValueArray == null))
{
this.m_HeightlayerIndex = layerIndex;
this.m_geoHeightCalcBound = geoCalcBound;
this.m_HeightValueArray = this.GetValueByGeoCalcBound(geoCalcBound, demDataType);
}
return this.m_HeightValueArray[indexInRect];
}
