ISymbolLevels Interface

Provides access to members that control symbol level drawing.

Product Availability

Description

Use this interface to enable/disable Symbol Level Drawing for a layer.

When To Use

Symbol Level Drawing is useful when creating large scale maps with intersecting and overlapping line features. For example, on a large scale reference map with intersecting highways and streets, Symbol Level Drawing helps you create high-quality representations of the street and highway street intersections.

To set up Symbol Level Drawing:

1. Turn on Symbol Level Drawing using either for your layer using ISymbolLevels::UseSymbolLevels, or for your entire map using IMap::UseSymbolLevels.
2. For each layer that you want to set up symbol levels for, access that layer's renderer using IGeoFeatureLayer::Renderer.
3. Access your layer's symbol(s) through the renderer.
4. Using IMapLevel, set symbol levels on your layer's symbols. Symbols with MapLevel = 0 draw first, then symbols with MapLevel = 1, continuing until the highest MapLevel is reached. If two symbols have the same MapLevel, then the features drawn with these symbols are drawn in the normal layer order. A MapLevel of -1 for a multilayer symbol (MultiLayerMarkerSymbol, MultiLayerLineSymbol, MultiLayerFillSymbol) indicates that each of the symbol's individual layers are drawn with their individual MapLevel.

Members

	Name	Description
	UseSymbolLevels	Indicates if symbol levels are used for drawing.

Classes that implement ISymbolLevels